goodie/addons/stock/models/stock.go

package models

import (
	"fmt"
	"log"
	"time"

	"odoo-go/pkg/orm"
)

// initStock registers all stock models.
// Mirrors: odoo/addons/stock/models/stock_warehouse.py,
//          stock_location.py, stock_picking.py, stock_move.py,
//          stock_move_line.py, stock_quant.py, stock_lot.py

func initStock() {
	initStockWarehouse()
	initStockLocation()
	initStockPickingType()
	initStockPicking()
	initStockMove()
	initStockMoveLine()
	initStockQuant()
	initStockLot()
	initStockRoute()
	initStockRule()
	initStockOrderpoint()
	initStockScrap()
	initStockInventory()
	initProductStockExtension()
	initStockValuationLayer()
	initStockLandedCost()
	initStockReport()
	initStockForecast()
	initStockPickingBatch()
	initStockPickingBatchExtension()
	initStockBarcode()
}

// initStockWarehouse registers stock.warehouse.
// Mirrors: odoo/addons/stock/models/stock_warehouse.py
func initStockWarehouse() {
	m := orm.NewModel("stock.warehouse", orm.ModelOpts{
		Description: "Warehouse",
		Order:       "sequence, id",
		RecName:     "name",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Warehouse", Required: true, Index: true}),
		orm.Char("code", orm.FieldOpts{String: "Short Name", Required: true, Size: 5}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{
			String: "Address",
		}),
		orm.Many2one("lot_stock_id", "stock.location", orm.FieldOpts{
			String: "Location Stock", Required: true, OnDelete: orm.OnDeleteRestrict,
		}),
		orm.Many2one("wh_input_stock_loc_id", "stock.location", orm.FieldOpts{
			String: "Input Location",
		}),
		orm.Many2one("wh_output_stock_loc_id", "stock.location", orm.FieldOpts{
			String: "Output Location",
		}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
	)
}

// initStockLocation registers stock.location.
// Mirrors: odoo/addons/stock/models/stock_location.py
func initStockLocation() {
	m := orm.NewModel("stock.location", orm.ModelOpts{
		Description: "Location",
		Order:       "complete_name, id",
		RecName:     "complete_name",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Location Name", Required: true, Translate: true}),
		orm.Char("complete_name", orm.FieldOpts{
			String: "Full Location Name", Compute: "_compute_complete_name", Store: true,
		}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
		orm.Selection("usage", []orm.SelectionItem{
			{Value: "supplier", Label: "Vendor Location"},
			{Value: "view", Label: "View"},
			{Value: "internal", Label: "Internal Location"},
			{Value: "customer", Label: "Customer Location"},
			{Value: "inventory", Label: "Inventory Loss"},
			{Value: "production", Label: "Production"},
			{Value: "transit", Label: "Transit Location"},
		}, orm.FieldOpts{String: "Location Type", Required: true, Default: "internal", Index: true}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{
			String: "Parent Location", Index: true, OnDelete: orm.OnDeleteCascade,
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Index: true,
		}),
		orm.Many2one("removal_strategy_id", "product.removal", orm.FieldOpts{
			String: "Removal Strategy",
		}),
		orm.Boolean("scrap_location", orm.FieldOpts{String: "Is a Scrap Location?"}),
		orm.Boolean("return_location", orm.FieldOpts{String: "Is a Return Location?"}),
		orm.Char("barcode", orm.FieldOpts{String: "Barcode", Index: true}),
	)
}

// initStockPickingType registers stock.picking.type.
// Mirrors: odoo/addons/stock/models/stock_picking.py StockPickingType
func initStockPickingType() {
	m := orm.NewModel("stock.picking.type", orm.ModelOpts{
		Description: "Picking Type",
		Order:       "sequence, id",
		RecName:     "name",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Operation Type", Required: true, Translate: true}),
		orm.Selection("code", []orm.SelectionItem{
			{Value: "incoming", Label: "Receipt"},
			{Value: "outgoing", Label: "Delivery"},
			{Value: "internal", Label: "Internal Transfer"},
		}, orm.FieldOpts{String: "Type of Operation", Required: true}),
		orm.Char("sequence_code", orm.FieldOpts{String: "Code", Required: true}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
		orm.Many2one("warehouse_id", "stock.warehouse", orm.FieldOpts{
			String: "Warehouse", OnDelete: orm.OnDeleteCascade,
		}),
		orm.Many2one("default_location_src_id", "stock.location", orm.FieldOpts{
			String: "Default Source Location",
		}),
		orm.Many2one("default_location_dest_id", "stock.location", orm.FieldOpts{
			String: "Default Destination Location",
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
		orm.Boolean("show_operations", orm.FieldOpts{String: "Show Detailed Operations"}),
		orm.Boolean("show_reserved", orm.FieldOpts{String: "Show Reserved"}),
	)
}

// initStockPicking registers stock.picking — the transfer order.
// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking
func initStockPicking() {
	m := orm.NewModel("stock.picking", orm.ModelOpts{
		Description: "Transfer",
		Order:       "priority desc, scheduled_date asc, id desc",
		RecName:     "name",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{
			String: "Reference", Default: "/", Required: true, Index: true, Readonly: true,
		}),
		orm.Selection("state", []orm.SelectionItem{
			{Value: "draft", Label: "Draft"},
			{Value: "waiting", Label: "Waiting Another Operation"},
			{Value: "confirmed", Label: "Waiting"},
			{Value: "assigned", Label: "Ready"},
			{Value: "done", Label: "Done"},
			{Value: "cancel", Label: "Cancelled"},
		}, orm.FieldOpts{String: "Status", Default: "draft", Compute: "_compute_state", Store: true, Index: true}),
		orm.Selection("priority", []orm.SelectionItem{
			{Value: "0", Label: "Normal"},
			{Value: "1", Label: "Urgent"},
		}, orm.FieldOpts{String: "Priority", Default: "0", Index: true}),
		orm.Many2one("picking_type_id", "stock.picking.type", orm.FieldOpts{
			String: "Operation Type", Required: true, Index: true,
		}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{
			String: "Source Location", Required: true, Index: true,
		}),
		orm.Many2one("location_dest_id", "stock.location", orm.FieldOpts{
			String: "Destination Location", Required: true, Index: true,
		}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{
			String: "Contact", Index: true,
		}),
		orm.Datetime("scheduled_date", orm.FieldOpts{String: "Scheduled Date", Required: true, Index: true}),
		orm.Datetime("date_deadline", orm.FieldOpts{String: "Deadline"}),
		orm.Datetime("date_done", orm.FieldOpts{String: "Date of Transfer", Readonly: true}),
		orm.One2many("move_ids", "stock.move", "picking_id", orm.FieldOpts{
			String: "Stock Moves",
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Text("note", orm.FieldOpts{String: "Notes"}),
		orm.Char("origin", orm.FieldOpts{String: "Source Document", Index: true}),
		orm.Boolean("is_locked", orm.FieldOpts{String: "Is Locked", Default: true}),
		orm.Boolean("show_check_availability", orm.FieldOpts{
			String: "Show Check Availability", Compute: "_compute_show_check_availability",
		}),
		orm.Boolean("show_validate", orm.FieldOpts{
			String: "Show Validate", Compute: "_compute_show_validate",
		}),
		orm.Many2one("backorder_id", "stock.picking", orm.FieldOpts{
			String: "Back Order of", Index: true,
		}),
		orm.Boolean("has_tracking", orm.FieldOpts{
			String: "Has Tracking", Compute: "_compute_has_tracking",
		}),
	)

	// --- BeforeCreate hook: auto-generate picking reference ---
	// Mirrors: stock.picking._create_sequence() / ir.sequence
	m.BeforeCreate = func(env *orm.Environment, vals orm.Values) error {
		name, _ := vals["name"].(string)
		if name == "" || name == "/" {
			seq, err := orm.NextByCode(env, "stock.picking")
			if err != nil || seq == "" {
				// Fallback: use DB sequence for guaranteed uniqueness
				var nextVal int64
				env.Tx().QueryRow(env.Ctx(),
					`SELECT nextval(pg_get_serial_sequence('stock_picking', 'id'))`).Scan(&nextVal)
				vals["name"] = fmt.Sprintf("WH/PICK/%05d", nextVal)
			} else {
				vals["name"] = seq
			}
		}
		return nil
	}

	// --- BeforeWrite hook: prevent modifications on done & locked transfers ---
	m.BeforeWrite = orm.StateGuard("stock_picking", "state = 'done' AND is_locked = true",
		[]string{"write_uid", "write_date", "is_locked", "message_partner_ids_count"},
		"cannot modify done & locked transfers — unlock first")

	// --- Business methods: stock move workflow ---

	// action_confirm transitions a picking from draft → confirmed.
	// Confirms all associated stock moves via _action_confirm (which also reserves),
	// then recomputes picking state based on resulting move states.
	// Mirrors: stock.picking.action_confirm()
	m.RegisterMethod("action_confirm", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, id := range rs.IDs() {
			var state string
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT state FROM stock_picking WHERE id = $1`, id).Scan(&state)
			if err != nil {
				return nil, fmt.Errorf("stock: cannot read picking %d: %w", id, err)
			}
			if state != "draft" {
				return nil, fmt.Errorf("stock: can only confirm draft pickings (picking %d is %q)", id, state)
			}

			// Confirm all draft moves via _action_confirm (which also tries to reserve)
			rows, err := env.Tx().Query(env.Ctx(),
				`SELECT id FROM stock_move WHERE picking_id = $1 AND state = 'draft'`, id)
			if err != nil {
				return nil, fmt.Errorf("stock: read draft moves for picking %d: %w", id, err)
			}
			var moveIDs []int64
			for rows.Next() {
				var mid int64
				if err := rows.Scan(&mid); err != nil {
					rows.Close()
					return nil, fmt.Errorf("stock: scan move for picking %d: %w", id, err)
				}
				moveIDs = append(moveIDs, mid)
			}
			rows.Close()
			if err := rows.Err(); err != nil {
				return nil, fmt.Errorf("stock: iterate moves for picking %d: %w", id, err)
			}

			if len(moveIDs) > 0 {
				moveRS := env.Model("stock.move").Browse(moveIDs...)
				moveModel := orm.Registry.Get("stock.move")
				if moveModel != nil {
					if confirmMethod, ok := moveModel.Methods["_action_confirm"]; ok {
						if _, err := confirmMethod(moveRS); err != nil {
							return nil, fmt.Errorf("stock: confirm moves for picking %d: %w", id, err)
						}
					}
				}
			}

			// Recompute picking state from move states
			if err := updatePickingStateFromMoves(env, id); err != nil {
				return nil, fmt.Errorf("stock: update picking %d state after confirm: %w", id, err)
			}
		}
		return true, nil
	})

	// action_assign reserves stock for all confirmed/waiting/partially_available moves on the picking.
	// Delegates to stock.move._action_assign() then recomputes picking state.
	// Mirrors: stock.picking.action_assign()
	m.RegisterMethod("action_assign", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			// Get moves that need reservation (including waiting state)
			rows, err := env.Tx().Query(env.Ctx(),
				`SELECT id FROM stock_move WHERE picking_id = $1 AND state IN ('confirmed', 'waiting', 'partially_available')`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock: read moves for assign picking %d: %w", pickingID, err)
			}
			var moveIDs []int64
			for rows.Next() {
				var id int64
				if err := rows.Scan(&id); err != nil {
					rows.Close()
					return nil, fmt.Errorf("stock: scan move for picking %d: %w", pickingID, err)
				}
				moveIDs = append(moveIDs, id)
			}
			rows.Close()
			if err := rows.Err(); err != nil {
				return nil, fmt.Errorf("stock: iterate moves for picking %d: %w", pickingID, err)
			}

			if len(moveIDs) > 0 {
				moveRS := env.Model("stock.move").Browse(moveIDs...)
				moveModel := orm.Registry.Get("stock.move")
				if moveModel != nil {
					if assignMethod, ok := moveModel.Methods["_action_assign"]; ok {
						if _, err := assignMethod(moveRS); err != nil {
							return nil, fmt.Errorf("stock: assign moves for picking %d: %w", pickingID, err)
						}
					}
				}
			}

			// Recompute picking state from move states
			if err := updatePickingStateFromMoves(env, pickingID); err != nil {
				return nil, fmt.Errorf("stock: update picking %d state after assign: %w", pickingID, err)
			}
		}
		return true, nil
	})

	// _update_state_from_move_lines: Recompute picking state when move line quantities change.
	// If all moves done → done, all cancelled → cancel, mix → assigned/confirmed.
	// Mirrors: stock.picking._compute_state() triggered by move line changes
	m.RegisterMethod("_update_state_from_move_lines", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			if err := updatePickingStateFromMoves(env, pickingID); err != nil {
				return nil, fmt.Errorf("stock.picking: _update_state_from_move_lines for %d: %w", pickingID, err)
			}
		}
		return true, nil
	})

	// _action_split_picking: Split a picking into two.
	// Moves with qty_done > 0 stay in the current picking, moves without qty_done
	// are moved to a new picking. Returns the new picking ID.
	// Mirrors: stock.picking._action_split() / split wizard
	m.RegisterMethod("_action_split_picking", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		// Find moves WITH qty_done (stay) and WITHOUT qty_done (go to new picking)
		rows, err := env.Tx().Query(env.Ctx(),
			`SELECT sm.id,
			        COALESCE((SELECT SUM(sml.quantity) FROM stock_move_line sml WHERE sml.move_id = sm.id), 0) as qty_done
			 FROM stock_move sm
			 WHERE sm.picking_id = $1 AND sm.state NOT IN ('done', 'cancel')`,
			pickingID)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: query moves for split %d: %w", pickingID, err)
		}

		var movesWithDone, movesWithoutDone []int64
		for rows.Next() {
			var moveID int64
			var qtyDone float64
			if err := rows.Scan(&moveID, &qtyDone); err != nil {
				rows.Close()
				return nil, fmt.Errorf("stock.picking: scan move for split: %w", err)
			}
			if qtyDone > 0.005 {
				movesWithDone = append(movesWithDone, moveID)
			} else {
				movesWithoutDone = append(movesWithoutDone, moveID)
			}
		}
		rows.Close()

		if len(movesWithoutDone) == 0 {
			return map[string]interface{}{"split": false, "message": "All moves have qty_done, nothing to split"}, nil
		}
		if len(movesWithDone) == 0 {
			return map[string]interface{}{"split": false, "message": "No moves have qty_done, nothing to split"}, nil
		}

		// Read original picking data
		var name, origin string
		var pickTypeID, locID, locDestID, companyID int64
		var partnerID *int64
		err = env.Tx().QueryRow(env.Ctx(),
			`SELECT name, COALESCE(origin,''), picking_type_id,
			        location_id, location_dest_id, company_id, partner_id
			 FROM stock_picking WHERE id = $1`, pickingID,
		).Scan(&name, &origin, &pickTypeID, &locID, &locDestID, &companyID, &partnerID)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: read picking %d for split: %w", pickingID, err)
		}

		// Create new picking for moves without qty_done
		newVals := orm.Values{
			"name":             fmt.Sprintf("%s-SPLIT", name),
			"picking_type_id":  pickTypeID,
			"location_id":      locID,
			"location_dest_id": locDestID,
			"company_id":       companyID,
			"origin":           origin,
			"backorder_id":     pickingID,
			"state":            "draft",
			"scheduled_date":   time.Now().Format("2006-01-02"),
		}
		if partnerID != nil {
			newVals["partner_id"] = *partnerID
		}
		newPicking, err := env.Model("stock.picking").Create(newVals)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: create split picking for %d: %w", pickingID, err)
		}

		// Move the no-qty-done moves to the new picking
		for _, moveID := range movesWithoutDone {
			_, err := env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move SET picking_id = $1 WHERE id = $2`, newPicking.ID(), moveID)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: move %d to split picking: %w", moveID, err)
			}
			// Also update move lines
			_, _ = env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move_line SET picking_id = $1 WHERE move_id = $2`, newPicking.ID(), moveID)
		}

		return map[string]interface{}{
			"split":          true,
			"new_picking_id": newPicking.ID(),
			"kept_moves":     len(movesWithDone),
			"split_moves":    len(movesWithoutDone),
		}, nil
	})

	// action_cancel: Cancel a picking and all its moves.
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking.action_cancel()
	m.RegisterMethod("action_cancel", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			if _, err := env.Tx().Exec(env.Ctx(), `UPDATE stock_move SET state = 'cancel' WHERE picking_id = $1`, pickingID); err != nil {
				return nil, fmt.Errorf("stock.picking: cancel moves for %d: %w", pickingID, err)
			}
			if _, err := env.Tx().Exec(env.Ctx(), `UPDATE stock_picking SET state = 'cancel' WHERE id = $1`, pickingID); err != nil {
				return nil, fmt.Errorf("stock.picking: cancel picking %d: %w", pickingID, err)
			}
		}
		return true, nil
	})

	// button_validate transitions a picking → done via _action_done on its moves.
	// Checks if all quantities are done; if not, creates a backorder for remaining.
	// Properly updates quants and clears reservations.
	// Mirrors: stock.picking.button_validate()
	m.RegisterMethod("button_validate", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			// Step 1: Check if there are any non-cancelled moves
			rows, err := env.Tx().Query(env.Ctx(),
				`SELECT id FROM stock_move WHERE picking_id = $1 AND state != 'cancel'`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock: read moves for picking %d: %w", pickingID, err)
			}
			var moveIDs []int64
			for rows.Next() {
				var id int64
				if err := rows.Scan(&id); err != nil {
					rows.Close()
					return nil, fmt.Errorf("stock: scan move for picking %d: %w", pickingID, err)
				}
				moveIDs = append(moveIDs, id)
			}
			rows.Close()
			if err := rows.Err(); err != nil {
				return nil, fmt.Errorf("stock: iterate moves for picking %d: %w", pickingID, err)
			}

			if len(moveIDs) == 0 {
				continue
			}

			// Step 1b: Enforce serial/lot tracking — reject if required lot is missing
			lotErr := enforceSerialLotTracking(env, pickingID)
			if lotErr != nil {
				return nil, lotErr
			}

			// Step 2: Check if any move has remaining qty (demand > qty_done)
			var hasRemaining bool
			env.Tx().QueryRow(env.Ctx(),
				`SELECT EXISTS(
					SELECT 1 FROM stock_move sm
					WHERE sm.picking_id = $1 AND sm.state NOT IN ('done', 'cancel')
					AND sm.product_uom_qty > COALESCE(
						(SELECT SUM(sml.quantity) FROM stock_move_line sml WHERE sml.move_id = sm.id), 0
					) + 0.005
				)`, pickingID,
			).Scan(&hasRemaining)

			// Step 3: If partial, create backorder for remaining quantities
			if hasRemaining {
				pickModel := orm.Registry.Get("stock.picking")
				if pickModel != nil {
					if boMethod, ok := pickModel.Methods["_create_backorder"]; ok {
						pickRS := env.Model("stock.picking").Browse(pickingID)
						if _, err := boMethod(pickRS); err != nil {
							return nil, fmt.Errorf("stock: create backorder for picking %d: %w", pickingID, err)
						}
					}
				}
			}

			// Step 4: Re-read move IDs (demand may have been adjusted by backorder)
			rows2, err := env.Tx().Query(env.Ctx(),
				`SELECT id FROM stock_move WHERE picking_id = $1 AND state NOT IN ('done', 'cancel')`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock: re-read moves for picking %d: %w", pickingID, err)
			}
			var activeMoveIDs []int64
			for rows2.Next() {
				var id int64
				if err := rows2.Scan(&id); err != nil {
					rows2.Close()
					return nil, fmt.Errorf("stock: scan active move for picking %d: %w", pickingID, err)
				}
				activeMoveIDs = append(activeMoveIDs, id)
			}
			rows2.Close()

			// Step 5: Call _action_done on all active moves
			if len(activeMoveIDs) > 0 {
				moveRS := env.Model("stock.move").Browse(activeMoveIDs...)
				moveModel := orm.Registry.Get("stock.move")
				if moveModel != nil {
					if doneMethod, ok := moveModel.Methods["_action_done"]; ok {
						if _, err := doneMethod(moveRS); err != nil {
							return nil, fmt.Errorf("stock: action_done for picking %d: %w", pickingID, err)
						}
					}
				}
			}

			// Step 6: Update picking state to done
			_, err = env.Tx().Exec(env.Ctx(),
				`UPDATE stock_picking SET state = 'done', date_done = NOW() WHERE id = $1`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock: validate picking %d: %w", pickingID, err)
			}
		}
		return true, nil
	})

	// do_unreserve: Un-reserve all moves on a picking, reset state to confirmed.
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking.do_unreserve()
	m.RegisterMethod("do_unreserve", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			// Clear reserved quantities on move lines
			env.Tx().Exec(env.Ctx(),
				`DELETE FROM stock_move_line WHERE move_id IN (SELECT id FROM stock_move WHERE picking_id = $1 AND state NOT IN ('done','cancel'))`, pickingID)
			// Reset moves to confirmed
			env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move SET state = 'confirmed', reserved_availability = 0 WHERE picking_id = $1 AND state NOT IN ('done','cancel')`, pickingID)
			// Reset picking state to confirmed
			env.Tx().Exec(env.Ctx(),
				`UPDATE stock_picking SET state = 'confirmed' WHERE id = $1 AND state NOT IN ('done','cancel')`, pickingID)
		}
		return true, nil
	})

	// _compute_state: Compute picking state from move states.
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking._compute_state()
	m.RegisterCompute("state", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		// Count moves by state
		var total, draftCount, cancelCount, doneCount, assignedCount int64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COUNT(*),
			        COUNT(*) FILTER (WHERE state = 'draft'),
			        COUNT(*) FILTER (WHERE state = 'cancel'),
			        COUNT(*) FILTER (WHERE state = 'done'),
			        COUNT(*) FILTER (WHERE state = 'assigned')
			 FROM stock_move WHERE picking_id = $1`, pickingID,
		).Scan(&total, &draftCount, &cancelCount, &doneCount, &assignedCount)

		if total == 0 || draftCount > 0 {
			return orm.Values{"state": "draft"}, nil
		}
		if cancelCount == total {
			return orm.Values{"state": "cancel"}, nil
		}
		if doneCount+cancelCount == total {
			return orm.Values{"state": "done"}, nil
		}
		if assignedCount+doneCount+cancelCount == total {
			return orm.Values{"state": "assigned"}, nil
		}
		return orm.Values{"state": "confirmed"}, nil
	})

	// _compute_show_check_availability: Show button when moves need reservation.
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking._compute_show_check_availability()
	m.RegisterCompute("show_check_availability", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		var state string
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(state, 'draft') FROM stock_picking WHERE id = $1`, pickingID,
		).Scan(&state)

		if state == "done" || state == "cancel" || state == "draft" {
			return orm.Values{"show_check_availability": false}, nil
		}

		// Show if any move is not fully reserved
		var needsReservation bool
		env.Tx().QueryRow(env.Ctx(),
			`SELECT EXISTS(
				SELECT 1 FROM stock_move
				WHERE picking_id = $1 AND state IN ('confirmed', 'partially_available', 'waiting')
			)`, pickingID,
		).Scan(&needsReservation)

		return orm.Values{"show_check_availability": needsReservation}, nil
	})

	// _compute_show_validate: Show validate button when picking can be validated.
	// Mirrors: odoo/addons/stock/models/stock_picking.py
	m.RegisterCompute("show_validate", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		var state string
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(state, 'draft') FROM stock_picking WHERE id = $1`, pickingID,
		).Scan(&state)

		show := state != "done" && state != "cancel" && state != "draft"
		return orm.Values{"show_validate": show}, nil
	})

	// _compute_has_tracking: Check if any move has lot/serial tracking.
	// Mirrors: stock.picking._compute_has_tracking()
	m.RegisterCompute("has_tracking", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		var hasTracking bool
		env.Tx().QueryRow(env.Ctx(),
			`SELECT EXISTS(
				SELECT 1 FROM stock_move sm
				JOIN product_product pp ON pp.id = sm.product_id
				JOIN product_template pt ON pt.id = pp.product_tmpl_id
				WHERE sm.picking_id = $1 AND pt.tracking != 'none'
			)`, pickingID,
		).Scan(&hasTracking)

		return orm.Values{"has_tracking": hasTracking}, nil
	})

	// action_set_quantities_to_reservation: Set done qty = reserved qty on all moves.
	// Mirrors: stock.picking.action_set_quantities_to_reservation()
	m.RegisterMethod("action_set_quantities_to_reservation", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			// For each non-done/cancel move, set move line quantities to match reservations
			_, err := env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move_line SET quantity = reserved_quantity
				 WHERE move_id IN (
					SELECT id FROM stock_move WHERE picking_id = $1 AND state NOT IN ('done', 'cancel')
				 ) AND reserved_quantity > 0`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: action_set_quantities_to_reservation for %d: %w", pickingID, err)
			}

			// For moves without move lines, create a move line with demand as quantity
			rows, err := env.Tx().Query(env.Ctx(),
				`SELECT sm.id, sm.product_id, sm.product_uom, sm.product_uom_qty,
				        sm.location_id, sm.location_dest_id, sm.company_id
				 FROM stock_move sm
				 WHERE sm.picking_id = $1
				   AND sm.state IN ('assigned', 'partially_available')
				   AND NOT EXISTS (SELECT 1 FROM stock_move_line WHERE move_id = sm.id)`,
				pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: query moves without lines for %d: %w", pickingID, err)
			}

			type moveInfo struct {
				ID, ProductID, UomID, LocationID, LocationDestID, CompanyID int64
				Qty                                                        float64
			}
			var moves []moveInfo
			for rows.Next() {
				var mi moveInfo
				if err := rows.Scan(&mi.ID, &mi.ProductID, &mi.UomID, &mi.Qty, &mi.LocationID, &mi.LocationDestID, &mi.CompanyID); err != nil {
					rows.Close()
					return nil, fmt.Errorf("stock.picking: scan move for set qty: %w", err)
				}
				moves = append(moves, mi)
			}
			rows.Close()

			for _, mi := range moves {
				_, err = env.Tx().Exec(env.Ctx(),
					`INSERT INTO stock_move_line
					 (move_id, product_id, product_uom_id, location_id, location_dest_id, quantity, company_id, date)
					 VALUES ($1, $2, $3, $4, $5, $6, $7, NOW())`,
					mi.ID, mi.ProductID, mi.UomID, mi.LocationID, mi.LocationDestID, mi.Qty, mi.CompanyID)
				if err != nil {
					return nil, fmt.Errorf("stock.picking: create move line for set qty move %d: %w", mi.ID, err)
				}
			}
		}
		return true, nil
	})

	// _check_entire_pack: Validate package completeness.
	// Mirrors: stock.picking._check_entire_pack()
	// Stub returning true — full package validation would require complete package quant tracking.
	m.RegisterMethod("_check_entire_pack", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		return true, nil
	})

	// _compute_entire_package_ids: Compute related package IDs for the picking.
	// Mirrors: stock.picking._compute_entire_package_ids()
	m.RegisterMethod("_compute_entire_package_ids", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		rows, err := env.Tx().Query(env.Ctx(),
			`SELECT DISTINCT sml.package_id FROM stock_move_line sml
			 JOIN stock_move sm ON sm.id = sml.move_id
			 WHERE sm.picking_id = $1 AND sml.package_id IS NOT NULL`, pickingID)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: compute entire_package_ids for %d: %w", pickingID, err)
		}
		defer rows.Close()

		var packageIDs []int64
		for rows.Next() {
			var pkgID int64
			if err := rows.Scan(&pkgID); err != nil {
				return nil, fmt.Errorf("stock.picking: scan package_id: %w", err)
			}
			packageIDs = append(packageIDs, pkgID)
		}
		return packageIDs, nil
	})

	// _create_backorder: Create a backorder picking for remaining unprocessed quantities.
	// Copies undone move lines to a new picking linked via backorder_id.
	// Mirrors: stock.picking._create_backorder()
	m.RegisterMethod("_create_backorder", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		// Read original picking data
		var name, state, origin string
		var pickTypeID, locID, locDestID, companyID int64
		var partnerID *int64
		err := env.Tx().QueryRow(env.Ctx(),
			`SELECT name, COALESCE(state,'draft'), COALESCE(origin,''), picking_type_id,
			        location_id, location_dest_id, company_id, partner_id
			 FROM stock_picking WHERE id = $1`, pickingID,
		).Scan(&name, &state, &origin, &pickTypeID, &locID, &locDestID, &companyID, &partnerID)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: read picking %d for backorder: %w", pickingID, err)
		}

		// Find moves where quantity_done < demand (partially done or not done)
		rows, err := env.Tx().Query(env.Ctx(),
			`SELECT sm.id, sm.product_id, sm.product_uom_qty, sm.product_uom,
			        sm.location_id, sm.location_dest_id, sm.company_id, sm.name,
			        COALESCE((SELECT SUM(sml.quantity) FROM stock_move_line sml WHERE sml.move_id = sm.id), 0) as qty_done
			 FROM stock_move sm
			 WHERE sm.picking_id = $1 AND sm.state NOT IN ('done', 'cancel')`,
			pickingID)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: query moves for backorder %d: %w", pickingID, err)
		}

		type backorderMove struct {
			ID, ProductID, UomID, LocID, LocDestID, CompanyID int64
			Demand, QtyDone                                   float64
			Name                                              string
		}
		var movesToBackorder []backorderMove
		for rows.Next() {
			var bm backorderMove
			if err := rows.Scan(&bm.ID, &bm.ProductID, &bm.Demand, &bm.UomID,
				&bm.LocID, &bm.LocDestID, &bm.CompanyID, &bm.Name, &bm.QtyDone); err != nil {
				rows.Close()
				return nil, fmt.Errorf("stock.picking: scan backorder move: %w", err)
			}
			remaining := bm.Demand - bm.QtyDone
			if remaining > 0.005 { // Float tolerance
				movesToBackorder = append(movesToBackorder, bm)
			}
		}
		rows.Close()

		if len(movesToBackorder) == 0 {
			return nil, nil // Nothing to backorder
		}

		// Create backorder picking
		boVals := orm.Values{
			"name":             fmt.Sprintf("%s-BO", name),
			"picking_type_id":  pickTypeID,
			"location_id":      locID,
			"location_dest_id": locDestID,
			"company_id":       companyID,
			"origin":           origin,
			"backorder_id":     pickingID,
			"state":            "draft",
			"scheduled_date":   time.Now().Format("2006-01-02"),
		}
		if partnerID != nil {
			boVals["partner_id"] = *partnerID
		}

		boPicking, err := env.Model("stock.picking").Create(boVals)
		if err != nil {
			return nil, fmt.Errorf("stock.picking: create backorder for %d: %w", pickingID, err)
		}

		// Create moves in the backorder for the remaining quantities
		moveRS := env.Model("stock.move")
		for _, bm := range movesToBackorder {
			remaining := bm.Demand - bm.QtyDone
			_, err := moveRS.Create(orm.Values{
				"name":             bm.Name,
				"product_id":       bm.ProductID,
				"product_uom_qty":  remaining,
				"product_uom":      bm.UomID,
				"location_id":      bm.LocID,
				"location_dest_id": bm.LocDestID,
				"picking_id":       boPicking.ID(),
				"company_id":       bm.CompanyID,
				"state":            "draft",
				"date":             time.Now(),
			})
			if err != nil {
				return nil, fmt.Errorf("stock.picking: create backorder move for %d: %w", bm.ID, err)
			}

			// Reduce demand on original move to match qty_done
			if bm.QtyDone > 0 {
				_, err = env.Tx().Exec(env.Ctx(),
					`UPDATE stock_move SET product_uom_qty = $1 WHERE id = $2`,
					bm.QtyDone, bm.ID)
				if err != nil {
					return nil, fmt.Errorf("stock.picking: reduce demand on move %d: %w", bm.ID, err)
				}
			}
		}

		return map[string]interface{}{
			"backorder_id": boPicking.ID(),
		}, nil
	})

	// action_generate_backorder_wizard: When not all qty is done, decide on backorder.
	// In Python Odoo this opens a wizard; here we auto-create the backorder.
	// Mirrors: stock.picking.action_generate_backorder_wizard()
	m.RegisterMethod("action_generate_backorder_wizard", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		// Check if all quantities are done
		var hasRemaining bool
		env.Tx().QueryRow(env.Ctx(),
			`SELECT EXISTS(
				SELECT 1 FROM stock_move sm
				WHERE sm.picking_id = $1 AND sm.state NOT IN ('done', 'cancel')
				AND sm.product_uom_qty > COALESCE(
					(SELECT SUM(sml.quantity) FROM stock_move_line sml WHERE sml.move_id = sm.id), 0
				) + 0.005
			)`, pickingID,
		).Scan(&hasRemaining)

		if !hasRemaining {
			return map[string]interface{}{"backorder_needed": false}, nil
		}

		// Create the backorder
		pickModel := orm.Registry.Get("stock.picking")
		if pickModel != nil {
			if boMethod, ok := pickModel.Methods["_create_backorder"]; ok {
				result, err := boMethod(rs)
				if err != nil {
					return nil, err
				}
				return map[string]interface{}{
					"backorder_needed": true,
					"backorder":        result,
				}, nil
			}
		}

		return map[string]interface{}{"backorder_needed": true}, nil
	})

	// action_back_to_draft: Reset a cancelled picking back to draft.
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking.action_back_to_draft()
	m.RegisterMethod("action_back_to_draft", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			var state string
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT state FROM stock_picking WHERE id = $1`, pickingID,
			).Scan(&state)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: read state for %d: %w", pickingID, err)
			}
			if state != "cancel" {
				return nil, fmt.Errorf("stock.picking: can only reset cancelled pickings to draft (picking %d is %q)", pickingID, state)
			}

			// Reset moves to draft
			_, err = env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move SET state = 'draft' WHERE picking_id = $1 AND state = 'cancel'`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: reset moves to draft for %d: %w", pickingID, err)
			}

			// Reset picking to draft
			_, err = env.Tx().Exec(env.Ctx(),
				`UPDATE stock_picking SET state = 'draft' WHERE id = $1`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: reset to draft for %d: %w", pickingID, err)
			}
		}
		return true, nil
	})

	// action_toggle_is_locked: Toggle the is_locked boolean for editing done pickings.
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking.action_toggle_is_locked()
	m.RegisterMethod("action_toggle_is_locked", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, pickingID := range rs.IDs() {
			_, err := env.Tx().Exec(env.Ctx(),
				`UPDATE stock_picking SET is_locked = NOT COALESCE(is_locked, true) WHERE id = $1`, pickingID)
			if err != nil {
				return nil, fmt.Errorf("stock.picking: toggle is_locked for %d: %w", pickingID, err)
			}
		}
		return true, nil
	})

	// send_receipt: Stub that returns true (for receipt email button).
	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking.send_receipt()
	m.RegisterMethod("send_receipt", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		return true, nil
	})

	// action_return creates a reverse transfer (return picking) with swapped locations.
	// Copies all done moves from the original picking to the return picking.
	// Mirrors: odoo/addons/stock/wizard/stock_picking_return.py
	m.RegisterMethod("action_return", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		pickingID := rs.IDs()[0]

		// Read original picking
		var partnerID, pickTypeID, locID, locDestID int64
		err := env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(partner_id,0), picking_type_id, location_id, location_dest_id
			 FROM stock_picking WHERE id = $1`, pickingID,
		).Scan(&partnerID, &pickTypeID, &locID, &locDestID)
		if err != nil {
			return nil, fmt.Errorf("stock: read picking %d for return: %w", pickingID, err)
		}

		// Create return picking (swap source and destination)
		returnRS := env.Model("stock.picking")
		returnVals := orm.Values{
			"name":            fmt.Sprintf("Return of %d", pickingID),
			"picking_type_id": pickTypeID,
			"location_id":     locDestID, // Swap!
			"location_dest_id": locID,    // Swap!
			"company_id":      int64(1),
			"state":           "draft",
			"scheduled_date":  time.Now().Format("2006-01-02"),
		}
		if partnerID > 0 {
			returnVals["partner_id"] = partnerID
		}

		returnPicking, err := returnRS.Create(returnVals)
		if err != nil {
			return nil, fmt.Errorf("stock: create return picking for %d: %w", pickingID, err)
		}

		// Copy moves with swapped locations
		moveRows, err := env.Tx().Query(env.Ctx(),
			`SELECT product_id, product_uom_qty, product_uom FROM stock_move
			 WHERE picking_id = $1 AND state = 'done'`, pickingID)
		if err != nil {
			return nil, fmt.Errorf("stock: read moves for return of picking %d: %w", pickingID, err)
		}
		defer moveRows.Close()

		moveRS := env.Model("stock.move")
		for moveRows.Next() {
			var prodID int64
			var qty float64
			var uomID int64
			if err := moveRows.Scan(&prodID, &qty, &uomID); err != nil {
				return nil, fmt.Errorf("stock: scan move for return of picking %d: %w", pickingID, err)
			}
			_, err := moveRS.Create(orm.Values{
				"name":             fmt.Sprintf("Return: product %d", prodID),
				"product_id":       prodID,
				"product_uom_qty":  qty,
				"product_uom":      uomID,
				"location_id":      locDestID,
				"location_dest_id": locID,
				"picking_id":       returnPicking.ID(),
				"company_id":       int64(1),
				"state":            "draft",
				"date":             time.Now(),
			})
			if err != nil {
				return nil, fmt.Errorf("stock: create return move for picking %d: %w", pickingID, err)
			}
		}

		return map[string]interface{}{
			"type":      "ir.actions.act_window",
			"res_model": "stock.picking",
			"res_id":    returnPicking.ID(),
			"view_mode": "form",
			"views":     [][]interface{}{{nil, "form"}},
			"target":    "current",
		}, nil
	})
}

// updateQuant adjusts the on-hand quantity for a product at a location.
// If no quant row exists yet it inserts one; otherwise it updates in place.
func updateQuant(env *orm.Environment, productID, locationID int64, delta float64) error {
	// Atomic upsert — eliminates TOCTOU race condition between concurrent transactions.
	// Uses INSERT ON CONFLICT to avoid separate SELECT+UPDATE/INSERT.
	_, err := env.Tx().Exec(env.Ctx(),
		`INSERT INTO stock_quant (product_id, location_id, quantity, reserved_quantity, company_id)
		 VALUES ($1, $2, $3, 0, 1)
		 ON CONFLICT (product_id, location_id)
		 DO UPDATE SET quantity = stock_quant.quantity + $3`,
		productID, locationID, delta)
	return err
}

// getAvailableQty returns unreserved on-hand quantity for a product at a location.
// Mirrors: stock.quant._get_available_quantity()
func getAvailableQty(env *orm.Environment, productID, locationID int64) float64 {
	var available float64
	env.Tx().QueryRow(env.Ctx(),
		`SELECT COALESCE(SUM(quantity - reserved_quantity), 0)
		 FROM stock_quant
		 WHERE product_id = $1 AND location_id = $2`,
		productID, locationID).Scan(&available)
	return available
}

// assignMove reserves available stock for a single move.
// Creates a stock.move.line (reservation) and updates quant reserved_quantity.
// Mirrors: stock.move._action_assign() per-move logic
func assignMove(env *orm.Environment, moveID int64) error {
	// Read move details
	var productID, locationID int64
	var qty float64
	var state string
	err := env.Tx().QueryRow(env.Ctx(),
		`SELECT product_id, product_uom_qty, location_id, state FROM stock_move WHERE id = $1`,
		moveID).Scan(&productID, &qty, &locationID, &state)
	if err != nil {
		return fmt.Errorf("stock: read move %d for assign: %w", moveID, err)
	}

	if state == "done" || state == "cancel" || qty <= 0 {
		return nil
	}

	// Skip if move already has reservation lines (prevent duplicates)
	var existingLines int
	env.Tx().QueryRow(env.Ctx(),
		`SELECT COUNT(*) FROM stock_move_line WHERE move_id = $1`, moveID).Scan(&existingLines)
	if existingLines > 0 {
		return nil
	}

	// Check available quantity in source location
	available := getAvailableQty(env, productID, locationID)

	// Reserve what we can
	reserved := qty
	if available < reserved {
		reserved = available
	}
	if reserved <= 0 {
		return nil // Nothing to reserve
	}

	// Create move line (reservation)
	_, err = env.Tx().Exec(env.Ctx(),
		`INSERT INTO stock_move_line (move_id, product_id, product_uom_id, location_id, location_dest_id, quantity, company_id, date)
		 SELECT $1, product_id, product_uom, location_id, location_dest_id, $2, company_id, COALESCE(date, NOW())
		 FROM stock_move WHERE id = $1`,
		moveID, reserved)
	if err != nil {
		return fmt.Errorf("stock: create move line for move %d: %w", moveID, err)
	}

	// Update quant reserved_quantity
	_, err = env.Tx().Exec(env.Ctx(),
		`UPDATE stock_quant SET reserved_quantity = reserved_quantity + $1
		 WHERE product_id = $2 AND location_id = $3`,
		reserved, productID, locationID)
	if err != nil {
		return fmt.Errorf("stock: update reserved qty for move %d: %w", moveID, err)
	}

	// Update move state
	if reserved >= qty-0.005 {
		_, err = env.Tx().Exec(env.Ctx(),
			`UPDATE stock_move SET state = 'assigned' WHERE id = $1`, moveID)
	} else {
		_, err = env.Tx().Exec(env.Ctx(),
			`UPDATE stock_move SET state = 'partially_available' WHERE id = $1`, moveID)
	}
	if err != nil {
		return fmt.Errorf("stock: update state for move %d: %w", moveID, err)
	}

	return nil
}

// initStockMove registers stock.move — individual product movements.
// Mirrors: odoo/addons/stock/models/stock_move.py
func initStockMove() {
	m := orm.NewModel("stock.move", orm.ModelOpts{
		Description: "Stock Move",
		Order:       "sequence, id",
		RecName:     "name",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Description", Required: true}),
		orm.Char("reference", orm.FieldOpts{String: "Reference", Index: true}),
		orm.Selection("state", []orm.SelectionItem{
			{Value: "draft", Label: "New"},
			{Value: "confirmed", Label: "Waiting Availability"},
			{Value: "partially_available", Label: "Partially Available"},
			{Value: "assigned", Label: "Available"},
			{Value: "done", Label: "Done"},
			{Value: "cancel", Label: "Cancelled"},
		}, orm.FieldOpts{String: "Status", Default: "draft", Index: true}),
		orm.Selection("priority", []orm.SelectionItem{
			{Value: "0", Label: "Normal"},
			{Value: "1", Label: "Urgent"},
		}, orm.FieldOpts{String: "Priority", Default: "0"}),
		orm.Many2one("product_id", "product.product", orm.FieldOpts{
			String: "Product", Required: true, Index: true,
		}),
		orm.Float("product_uom_qty", orm.FieldOpts{String: "Demand", Required: true, Default: 1.0}),
		orm.Float("quantity_done", orm.FieldOpts{String: "Quantity Done", Compute: "_compute_quantity_done"}),
		orm.Float("reserved_availability", orm.FieldOpts{String: "Forecast Availability"}),
		orm.Many2one("product_uom", "uom.uom", orm.FieldOpts{
			String: "UoM", Required: true,
		}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{
			String: "Source Location", Required: true, Index: true,
		}),
		orm.Many2one("location_dest_id", "stock.location", orm.FieldOpts{
			String: "Destination Location", Required: true, Index: true,
		}),
		orm.Many2one("picking_id", "stock.picking", orm.FieldOpts{
			String: "Transfer", Index: true,
		}),
		orm.Datetime("date", orm.FieldOpts{String: "Date Scheduled", Required: true, Index: true}),
		orm.Datetime("date_deadline", orm.FieldOpts{String: "Deadline"}),
		orm.Monetary("price_unit", orm.FieldOpts{String: "Unit Price", CurrencyField: "currency_id"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
		orm.Monetary("value", orm.FieldOpts{String: "Value", Compute: "_compute_value", Store: true, CurrencyField: "currency_id"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
		orm.Char("origin", orm.FieldOpts{String: "Source Document"}),
		orm.Float("forecast_availability", orm.FieldOpts{
			String: "Forecast Availability", Compute: "_compute_forecast_availability",
		}),
		orm.One2many("move_line_ids", "stock.move.line", "move_id", orm.FieldOpts{
			String: "Move Lines",
		}),
	)

	// _compute_value: value = price_unit * product_uom_qty
	// Mirrors: odoo/addons/stock/models/stock_move.py StockMove._compute_value()
	m.RegisterCompute("value", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		moveID := rs.IDs()[0]
		var priceUnit, qty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(price_unit, 0), COALESCE(product_uom_qty, 0) FROM stock_move WHERE id = $1`,
			moveID).Scan(&priceUnit, &qty)
		return orm.Values{"value": priceUnit * qty}, nil
	})

	// _action_confirm: Confirm stock moves (draft → confirmed), then try to reserve.
	// Mirrors: odoo/addons/stock/models/stock_move.py StockMove._action_confirm()
	m.RegisterMethod("_action_confirm", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, moveID := range rs.IDs() {
			var state string
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT state FROM stock_move WHERE id = $1`, moveID).Scan(&state)
			if err != nil {
				return nil, fmt.Errorf("stock: read move %d for confirm: %w", moveID, err)
			}
			if state != "draft" {
				continue
			}

			// Set to confirmed
			_, err = env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move SET state = 'confirmed' WHERE id = $1`, moveID)
			if err != nil {
				return nil, fmt.Errorf("stock: confirm move %d: %w", moveID, err)
			}

			// Try to reserve (assign) immediately
			if err := assignMove(env, moveID); err != nil {
				return nil, fmt.Errorf("stock: assign move %d after confirm: %w", moveID, err)
			}
		}
		return true, nil
	})

	// _action_assign: Reserve stock for confirmed moves.
	// Mirrors: odoo/addons/stock/models/stock_move.py StockMove._action_assign()
	m.RegisterMethod("_action_assign", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, moveID := range rs.IDs() {
			if err := assignMove(env, moveID); err != nil {
				return nil, fmt.Errorf("stock: assign move %d: %w", moveID, err)
			}
		}
		return true, nil
	})

	// _action_done: Finalize stock moves (assigned → done), updating quants and clearing reservations.
	// Mirrors: odoo/addons/stock/models/stock_move.py StockMove._action_done()
	m.RegisterMethod("_action_done", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, id := range rs.IDs() {
			var productID, srcLoc, dstLoc int64
			var demandQty float64
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT product_id, product_uom_qty, location_id, location_dest_id
				 FROM stock_move WHERE id = $1`, id).Scan(&productID, &demandQty, &srcLoc, &dstLoc)
			if err != nil {
				return nil, fmt.Errorf("stock: read move %d for done: %w", id, err)
			}

			// Use actual done qty from move lines, falling back to demand
			var doneQty float64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(SUM(quantity), 0) FROM stock_move_line WHERE move_id = $1`, id,
			).Scan(&doneQty)
			if doneQty == 0 {
				doneQty = demandQty
			}

			// Only update quants for internal locations (skip supplier/customer/virtual)
			var srcUsage, dstUsage string
			env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(usage, '') FROM stock_location WHERE id = $1`, srcLoc).Scan(&srcUsage)
			env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(usage, '') FROM stock_location WHERE id = $1`, dstLoc).Scan(&dstUsage)

			if srcUsage == "internal" {
				if err := updateQuant(env, productID, srcLoc, -doneQty); err != nil {
					return nil, fmt.Errorf("stock: update source quant for move %d: %w", id, err)
				}
			}
			if dstUsage == "internal" {
				if err := updateQuant(env, productID, dstLoc, doneQty); err != nil {
					return nil, fmt.Errorf("stock: update dest quant for move %d: %w", id, err)
				}
			}

			// Clear reservation on source quant (only if internal)
			if srcUsage == "internal" {
				env.Tx().Exec(env.Ctx(),
					`UPDATE stock_quant SET reserved_quantity = GREATEST(reserved_quantity - $1, 0)
					 WHERE product_id = $2 AND location_id = $3`,
					doneQty, productID, srcLoc)
			}

			// Mark move as done
			_, err = env.Tx().Exec(env.Ctx(),
				`UPDATE stock_move SET state = 'done', date = NOW() WHERE id = $1`, id)
			if err != nil {
				return nil, fmt.Errorf("stock: done move %d: %w", id, err)
			}

			// Multi-location transfer propagation: auto-create chained move if a push rule exists
			if err := propagateChainedMove(env, id, productID, dstLoc, doneQty); err != nil {
				log.Printf("stock: chain propagation for move %d: %v", id, err)
			}
		}
		return true, nil
	})

	// _action_cancel: Cancel stock moves, unreserving any reserved quantities.
	// Mirrors: odoo/addons/stock/models/stock_move.py StockMove._action_cancel()
	m.RegisterMethod("_action_cancel", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		moveIDs := rs.IDs()
		if len(moveIDs) == 0 {
			return true, nil
		}

		// Check for done moves (cannot cancel)
		var doneCount int
		if err := env.Tx().QueryRow(env.Ctx(),
			`SELECT COUNT(*) FROM stock_move WHERE id = ANY($1) AND state = 'done'`, moveIDs,
		).Scan(&doneCount); err != nil {
			return nil, fmt.Errorf("stock.move: cancel check: %w", err)
		}
		if doneCount > 0 {
			return nil, fmt.Errorf("stock.move: cannot cancel done moves — create a return instead")
		}

		// Batch release reservations: aggregate reserved qty per product+location
		rows, err := env.Tx().Query(env.Ctx(),
			`SELECT sm.product_id, sm.location_id, COALESCE(SUM(sml.quantity), 0)
			 FROM stock_move sm
			 LEFT JOIN stock_move_line sml ON sml.move_id = sm.id
			 WHERE sm.id = ANY($1) AND sm.state NOT IN ('done', 'cancel')
			 GROUP BY sm.product_id, sm.location_id
			 HAVING SUM(sml.quantity) > 0`, moveIDs)
		if err != nil {
			return nil, fmt.Errorf("stock.move: cancel reservation query: %w", err)
		}
		for rows.Next() {
			var productID, locationID int64
			var reserved float64
			if err := rows.Scan(&productID, &locationID, &reserved); err != nil {
				rows.Close()
				return nil, err
			}
			env.Tx().Exec(env.Ctx(),
				`UPDATE stock_quant SET reserved_quantity = GREATEST(reserved_quantity - $1, 0)
				 WHERE product_id = $2 AND location_id = $3`,
				reserved, productID, locationID)
		}
		rows.Close()

		// Batch delete all move lines
		if _, err := env.Tx().Exec(env.Ctx(),
			`DELETE FROM stock_move_line WHERE move_id = ANY($1)`, moveIDs); err != nil {
			return nil, fmt.Errorf("stock.move: delete move lines: %w", err)
		}

		// Batch update state to cancel (skip already cancelled)
		if _, err := env.Tx().Exec(env.Ctx(),
			`UPDATE stock_move SET state = 'cancel' WHERE id = ANY($1) AND state != 'cancel'`, moveIDs); err != nil {
			return nil, fmt.Errorf("stock.move: cancel: %w", err)
		}

		return true, nil
	})

	// _compute_quantity_done: Sum of move line quantities.
	// Mirrors: odoo/addons/stock/models/stock_move.py StockMove._compute_quantity_done()
	m.RegisterCompute("quantity_done", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		moveID := rs.IDs()[0]
		var qtyDone float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(quantity), 0) FROM stock_move_line WHERE move_id = $1`, moveID,
		).Scan(&qtyDone)
		return orm.Values{"quantity_done": qtyDone}, nil
	})

	// _compute_reserved_availability: SUM reserved_quantity from move_lines / product_uom_qty as percentage.
	// Mirrors: stock.move._compute_reserved_availability()
	m.RegisterCompute("reserved_availability", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		moveID := rs.IDs()[0]

		var demandQty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(product_uom_qty, 0) FROM stock_move WHERE id = $1`, moveID,
		).Scan(&demandQty)

		if demandQty <= 0 {
			return orm.Values{"reserved_availability": float64(0)}, nil
		}

		var reservedQty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(quantity), 0) FROM stock_move_line WHERE move_id = $1`, moveID,
		).Scan(&reservedQty)

		// Return as absolute reserved qty (Odoo convention, not percentage)
		return orm.Values{"reserved_availability": reservedQty}, nil
	})

	// _compute_forecast_availability: Check available qty from quants for the move's product+location.
	// Mirrors: stock.move._compute_forecast_information()
	m.RegisterCompute("forecast_availability", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		moveID := rs.IDs()[0]

		var productID, locationID int64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT product_id, location_id FROM stock_move WHERE id = $1`, moveID,
		).Scan(&productID, &locationID)

		available := getAvailableQty(env, productID, locationID)
		return orm.Values{"forecast_availability": available}, nil
	})

	// _generate_serial_move_line_commands: For serial-tracked products, create one move line per serial.
	// Expects args: []string of serial numbers.
	// Mirrors: stock.move._generate_serial_move_line_commands()
	m.RegisterMethod("_generate_serial_move_line_commands", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 1 {
			return nil, fmt.Errorf("stock.move._generate_serial_move_line_commands requires serial numbers")
		}
		serials, ok := args[0].([]string)
		if !ok || len(serials) == 0 {
			return nil, fmt.Errorf("stock.move._generate_serial_move_line_commands: invalid serial numbers argument")
		}

		env := rs.Env()
		moveID := rs.IDs()[0]

		// Read move details
		var productID, uomID, locationID, locationDestID, companyID int64
		err := env.Tx().QueryRow(env.Ctx(),
			`SELECT product_id, product_uom, location_id, location_dest_id, company_id
			 FROM stock_move WHERE id = $1`, moveID,
		).Scan(&productID, &uomID, &locationID, &locationDestID, &companyID)
		if err != nil {
			return nil, fmt.Errorf("stock.move: read move %d for serial generation: %w", moveID, err)
		}

		var createdLineIDs []int64
		for _, serial := range serials {
			// Find or create the lot
			var lotID int64
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT id FROM stock_lot WHERE name = $1 AND product_id = $2 LIMIT 1`,
				serial, productID,
			).Scan(&lotID)
			if err != nil || lotID == 0 {
				// Create the lot
				err = env.Tx().QueryRow(env.Ctx(),
					`INSERT INTO stock_lot (name, product_id, company_id) VALUES ($1, $2, $3) RETURNING id`,
					serial, productID, companyID,
				).Scan(&lotID)
				if err != nil {
					return nil, fmt.Errorf("stock.move: create lot for serial %q: %w", serial, err)
				}
			}

			// Create move line with qty 1 (one per serial)
			var lineID int64
			err = env.Tx().QueryRow(env.Ctx(),
				`INSERT INTO stock_move_line
				 (move_id, product_id, product_uom_id, lot_id, location_id, location_dest_id, quantity, company_id, date)
				 VALUES ($1, $2, $3, $4, $5, $6, 1, $7, NOW())
				 RETURNING id`,
				moveID, productID, uomID, lotID, locationID, locationDestID, companyID,
			).Scan(&lineID)
			if err != nil {
				return nil, fmt.Errorf("stock.move: create serial move line for %q: %w", serial, err)
			}
			createdLineIDs = append(createdLineIDs, lineID)
		}

		return map[string]interface{}{
			"move_line_ids": createdLineIDs,
			"count":         len(createdLineIDs),
		}, nil
	})
}

// initStockMoveLine registers stock.move.line — detailed operations per lot/package.
// Mirrors: odoo/addons/stock/models/stock_move_line.py
func initStockMoveLine() {
	m := orm.NewModel("stock.move.line", orm.ModelOpts{
		Description: "Product Moves (Stock Move Line)",
		Order:       "result_package_id desc, id",
	})

	m.AddFields(
		orm.Many2one("move_id", "stock.move", orm.FieldOpts{
			String: "Stock Move", Index: true, OnDelete: orm.OnDeleteCascade,
		}),
		orm.Many2one("product_id", "product.product", orm.FieldOpts{
			String: "Product", Required: true, Index: true,
		}),
		orm.Float("quantity", orm.FieldOpts{String: "Quantity", Required: true, Default: 0.0}),
		orm.Many2one("product_uom_id", "uom.uom", orm.FieldOpts{
			String: "Unit of Measure", Required: true,
		}),
		orm.Many2one("lot_id", "stock.lot", orm.FieldOpts{
			String: "Lot/Serial Number", Index: true,
		}),
		orm.Many2one("package_id", "stock.quant.package", orm.FieldOpts{
			String: "Source Package",
		}),
		orm.Many2one("result_package_id", "stock.quant.package", orm.FieldOpts{
			String: "Destination Package",
		}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{
			String: "From", Required: true, Index: true,
		}),
		orm.Many2one("location_dest_id", "stock.location", orm.FieldOpts{
			String: "To", Required: true, Index: true,
		}),
		orm.Many2one("picking_id", "stock.picking", orm.FieldOpts{
			String: "Transfer", Index: true,
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Datetime("date", orm.FieldOpts{String: "Date", Required: true}),
		orm.Selection("state", []orm.SelectionItem{
			{Value: "draft", Label: "New"},
			{Value: "confirmed", Label: "Waiting"},
			{Value: "assigned", Label: "Reserved"},
			{Value: "done", Label: "Done"},
			{Value: "cancel", Label: "Cancelled"},
		}, orm.FieldOpts{String: "Status", Default: "draft"}),
	)
}

// initStockQuant registers stock.quant — on-hand inventory quantities.
// Mirrors: odoo/addons/stock/models/stock_quant.py
func initStockQuant() {
	m := orm.NewModel("stock.quant", orm.ModelOpts{
		Description: "Quants",
		Order:       "removal_date, in_date, id",
	})

	m.AddFields(
		orm.Many2one("product_id", "product.product", orm.FieldOpts{
			String: "Product", Required: true, Index: true, OnDelete: orm.OnDeleteRestrict,
		}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{
			String: "Location", Required: true, Index: true, OnDelete: orm.OnDeleteRestrict,
		}),
		orm.Many2one("lot_id", "stock.lot", orm.FieldOpts{
			String: "Lot/Serial Number", Index: true,
		}),
		orm.Float("quantity", orm.FieldOpts{String: "Quantity", Required: true, Default: 0.0}),
		orm.Float("reserved_quantity", orm.FieldOpts{String: "Reserved Quantity", Required: true, Default: 0.0}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Monetary("value", orm.FieldOpts{String: "Value", CurrencyField: "currency_id"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
		orm.Datetime("in_date", orm.FieldOpts{String: "Incoming Date", Index: true}),
		orm.Many2one("package_id", "stock.quant.package", orm.FieldOpts{
			String: "Package",
		}),
		orm.Many2one("owner_id", "res.partner", orm.FieldOpts{
			String: "Owner",
		}),
		orm.Datetime("removal_date", orm.FieldOpts{String: "Removal Date"}),
	)

	// _update_available_quantity: Adjust available quantity for a product at a location.
	// Mirrors: odoo/addons/stock/models/stock_quant.py StockQuant._update_available_quantity()
	m.RegisterMethod("_update_available_quantity", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 3 {
			return nil, fmt.Errorf("stock.quant._update_available_quantity requires product_id, location_id, quantity")
		}
		productID, _ := args[0].(int64)
		locationID, _ := args[1].(int64)
		quantity, _ := args[2].(float64)
		if productID == 0 || locationID == 0 {
			return nil, fmt.Errorf("stock.quant._update_available_quantity: invalid product_id or location_id")
		}
		env := rs.Env()
		if err := updateQuant(env, productID, locationID, quantity); err != nil {
			return nil, fmt.Errorf("stock.quant._update_available_quantity: %w", err)
		}
		return true, nil
	})

	// _get_available_quantity: Query available (unreserved) qty for a product at a location.
	// Optionally filter by lot_id (args[2]).
	// Mirrors: odoo/addons/stock/models/stock_quant.py StockQuant._get_available_quantity()
	m.RegisterMethod("_get_available_quantity", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 2 {
			return nil, fmt.Errorf("stock.quant._get_available_quantity requires product_id, location_id")
		}
		productID, _ := args[0].(int64)
		locationID, _ := args[1].(int64)
		if productID == 0 || locationID == 0 {
			return nil, fmt.Errorf("stock.quant._get_available_quantity: invalid product_id or location_id")
		}

		env := rs.Env()
		var lotID int64
		if len(args) >= 3 {
			lotID, _ = args[2].(int64)
		}

		var available float64
		if lotID > 0 {
			env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(SUM(quantity - reserved_quantity), 0)
				 FROM stock_quant
				 WHERE product_id = $1 AND location_id = $2 AND lot_id = $3`,
				productID, locationID, lotID).Scan(&available)
		} else {
			available = getAvailableQty(env, productID, locationID)
		}
		return available, nil
	})

	// _gather: Find quants matching product + location + optional lot criteria.
	// Returns quant IDs as []int64.
	// Args: product_id (int64), location_id (int64), optional lot_id (int64).
	// Mirrors: odoo/addons/stock/models/stock_quant.py StockQuant._gather()
	m.RegisterMethod("_gather", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 2 {
			return nil, fmt.Errorf("stock.quant._gather requires product_id, location_id")
		}
		productID, _ := args[0].(int64)
		locationID, _ := args[1].(int64)
		if productID == 0 || locationID == 0 {
			return nil, fmt.Errorf("stock.quant._gather: invalid product_id or location_id")
		}

		env := rs.Env()
		var lotID int64
		if len(args) >= 3 {
			lotID, _ = args[2].(int64)
		}

		var query string
		var queryArgs []interface{}
		if lotID > 0 {
			query = `SELECT id FROM stock_quant
			         WHERE product_id = $1 AND location_id = $2 AND lot_id = $3
			         ORDER BY in_date, id`
			queryArgs = []interface{}{productID, locationID, lotID}
		} else {
			query = `SELECT id FROM stock_quant
			         WHERE product_id = $1 AND location_id = $2
			         ORDER BY in_date, id`
			queryArgs = []interface{}{productID, locationID}
		}

		rows, err := env.Tx().Query(env.Ctx(), query, queryArgs...)
		if err != nil {
			return nil, fmt.Errorf("stock.quant._gather: %w", err)
		}
		defer rows.Close()

		var quantIDs []int64
		for rows.Next() {
			var qid int64
			if err := rows.Scan(&qid); err != nil {
				return nil, fmt.Errorf("stock.quant._gather scan: %w", err)
			}
			quantIDs = append(quantIDs, qid)
		}
		return quantIDs, nil
	})

	// _compute_qty_at_date: Historical stock query — SUM moves done before a given date.
	// Args: product_id (int64), location_id (int64), date (string YYYY-MM-DD)
	// Mirrors: stock.quant._compute_qty_at_date() / stock history
	m.RegisterMethod("_compute_qty_at_date", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 3 {
			return nil, fmt.Errorf("stock.quant._compute_qty_at_date requires product_id, location_id, date")
		}
		productID, _ := args[0].(int64)
		locationID, _ := args[1].(int64)
		dateStr, _ := args[2].(string)
		if productID == 0 || locationID == 0 || dateStr == "" {
			return nil, fmt.Errorf("stock.quant._compute_qty_at_date: invalid args")
		}

		env := rs.Env()

		// Sum incoming moves (destination = this location) done before the date
		var incoming float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(
				COALESCE((SELECT SUM(sml.quantity) FROM stock_move_line sml WHERE sml.move_id = sm.id), sm.product_uom_qty)
			 ), 0)
			 FROM stock_move sm
			 WHERE sm.product_id = $1 AND sm.location_dest_id = $2
			   AND sm.state = 'done' AND sm.date <= $3`,
			productID, locationID, dateStr,
		).Scan(&incoming)

		// Sum outgoing moves (source = this location) done before the date
		var outgoing float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(
				COALESCE((SELECT SUM(sml.quantity) FROM stock_move_line sml WHERE sml.move_id = sm.id), sm.product_uom_qty)
			 ), 0)
			 FROM stock_move sm
			 WHERE sm.product_id = $1 AND sm.location_id = $2
			   AND sm.state = 'done' AND sm.date <= $3`,
			productID, locationID, dateStr,
		).Scan(&outgoing)

		qtyAtDate := incoming - outgoing
		return map[string]interface{}{
			"product_id":  productID,
			"location_id": locationID,
			"date":        dateStr,
			"qty_at_date": qtyAtDate,
			"incoming":    incoming,
			"outgoing":    outgoing,
		}, nil
	})

	// _compute_forecast_qty: on_hand - outgoing_reserved + incoming_confirmed.
	// Args: product_id (int64), location_id (int64)
	// Mirrors: stock.quant forecast computation
	m.RegisterMethod("_compute_forecast_qty", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 2 {
			return nil, fmt.Errorf("stock.quant._compute_forecast_qty requires product_id, location_id")
		}
		productID, _ := args[0].(int64)
		locationID, _ := args[1].(int64)
		if productID == 0 || locationID == 0 {
			return nil, fmt.Errorf("stock.quant._compute_forecast_qty: invalid args")
		}

		env := rs.Env()

		// On-hand quantity at location
		var onHand float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(quantity), 0) FROM stock_quant
			 WHERE product_id = $1 AND location_id = $2`,
			productID, locationID,
		).Scan(&onHand)

		// Outgoing reserved: confirmed/assigned moves FROM this location
		var outgoingReserved float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(product_uom_qty), 0) FROM stock_move
			 WHERE product_id = $1 AND location_id = $2
			   AND state IN ('confirmed', 'assigned', 'waiting', 'partially_available')`,
			productID, locationID,
		).Scan(&outgoingReserved)

		// Incoming confirmed: confirmed/assigned moves TO this location
		var incomingConfirmed float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(product_uom_qty), 0) FROM stock_move
			 WHERE product_id = $1 AND location_dest_id = $2
			   AND state IN ('confirmed', 'assigned', 'waiting', 'partially_available')`,
			productID, locationID,
		).Scan(&incomingConfirmed)

		forecastQty := onHand - outgoingReserved + incomingConfirmed

		return map[string]interface{}{
			"product_id":         productID,
			"location_id":        locationID,
			"on_hand":            onHand,
			"outgoing_reserved":  outgoingReserved,
			"incoming_confirmed": incomingConfirmed,
			"forecast_qty":       forecastQty,
		}, nil
	})

	// stock.quant.package — physical packages / containers
	orm.NewModel("stock.quant.package", orm.ModelOpts{
		Description: "Packages",
		Order:       "name",
	}).AddFields(
		orm.Char("name", orm.FieldOpts{String: "Package Reference", Required: true, Index: true}),
		orm.Many2one("package_type_id", "stock.package.type", orm.FieldOpts{
			String: "Package Type",
		}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{
			String: "Location", Index: true,
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Index: true,
		}),
		orm.Many2one("owner_id", "res.partner", orm.FieldOpts{
			String: "Owner",
		}),
	)

	// stock.package.type — packaging types (box, pallet, etc.)
	orm.NewModel("stock.package.type", orm.ModelOpts{
		Description: "Package Type",
		Order:       "sequence, id",
	}).AddFields(
		orm.Char("name", orm.FieldOpts{String: "Package Type", Required: true}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 1}),
		orm.Float("height", orm.FieldOpts{String: "Height"}),
		orm.Float("width", orm.FieldOpts{String: "Width"}),
		orm.Float("packaging_length", orm.FieldOpts{String: "Length"}),
		orm.Float("max_weight", orm.FieldOpts{String: "Max Weight"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
	)

	// product.removal — removal strategies (FIFO, LIFO, etc.)
	orm.NewModel("product.removal", orm.ModelOpts{
		Description: "Removal Strategy",
		Order:       "name",
	}).AddFields(
		orm.Char("name", orm.FieldOpts{String: "Name", Required: true, Translate: true}),
		orm.Char("method", orm.FieldOpts{String: "Method", Required: true}),
	)
}

// initStockLot registers stock.lot — lot/serial number tracking.
// Mirrors: odoo/addons/stock/models/stock_lot.py
func initStockLot() {
	m := orm.NewModel("stock.lot", orm.ModelOpts{
		Description: "Lot/Serial",
		Order:       "name, id",
		RecName:     "name",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Lot/Serial Number", Required: true, Index: true}),
		orm.Many2one("product_id", "product.product", orm.FieldOpts{
			String: "Product", Required: true, Index: true, OnDelete: orm.OnDeleteRestrict,
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Text("note", orm.FieldOpts{String: "Description"}),
		orm.Date("expiration_date", orm.FieldOpts{String: "Expiration Date"}),
		orm.Date("use_date", orm.FieldOpts{String: "Best Before Date"}),
		orm.Date("removal_date", orm.FieldOpts{String: "Removal Date"}),
		orm.Float("product_qty", orm.FieldOpts{String: "Quantity", Compute: "_compute_qty"}),
	)

	// Compute lot quantity from quants.
	// Mirrors: odoo/addons/stock/models/stock_lot.py StockLot._product_qty()
	m.RegisterCompute("product_qty", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lotID := rs.IDs()[0]
		var qty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(quantity), 0) FROM stock_quant WHERE lot_id = $1`, lotID,
		).Scan(&qty)
		return orm.Values{"product_qty": qty}, nil
	})

	// _generate_serial_numbers: Auto-create sequential lot/serial records for a product.
	// Args: product_id (int64), prefix (string), count (int64), company_id (int64)
	// Creates lots named prefix0001, prefix0002, ... prefixNNNN.
	// Mirrors: stock.lot.generate_lot_names() / serial number generation wizard
	m.RegisterMethod("_generate_serial_numbers", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 3 {
			return nil, fmt.Errorf("stock.lot._generate_serial_numbers requires product_id, prefix, count")
		}
		productID, _ := args[0].(int64)
		prefix, _ := args[1].(string)
		count, _ := args[2].(int64)
		if productID == 0 || count <= 0 {
			return nil, fmt.Errorf("stock.lot._generate_serial_numbers: invalid product_id or count")
		}

		companyID := int64(1)
		if len(args) >= 4 {
			if cid, ok := args[3].(int64); ok && cid > 0 {
				companyID = cid
			}
		}

		env := rs.Env()
		var createdIDs []int64
		var createdNames []string

		for i := int64(1); i <= count; i++ {
			lotName := fmt.Sprintf("%s%04d", prefix, i)

			// Check if lot already exists
			var existingID int64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT id FROM stock_lot WHERE name = $1 AND product_id = $2 LIMIT 1`,
				lotName, productID,
			).Scan(&existingID)
			if existingID > 0 {
				continue // Skip duplicates
			}

			var lotID int64
			err := env.Tx().QueryRow(env.Ctx(),
				`INSERT INTO stock_lot (name, product_id, company_id) VALUES ($1, $2, $3) RETURNING id`,
				lotName, productID, companyID,
			).Scan(&lotID)
			if err != nil {
				return nil, fmt.Errorf("stock.lot._generate_serial_numbers: create lot %q: %w", lotName, err)
			}
			createdIDs = append(createdIDs, lotID)
			createdNames = append(createdNames, lotName)
		}

		return map[string]interface{}{
			"lot_ids": createdIDs,
			"names":   createdNames,
			"count":   len(createdIDs),
		}, nil
	})
}

// initStockOrderpoint registers stock.warehouse.orderpoint — reorder rules.
// Mirrors: odoo/addons/stock/models/stock_orderpoint.py
func initStockOrderpoint() {
	m := orm.NewModel("stock.warehouse.orderpoint", orm.ModelOpts{
		Description: "Reorder Rule",
		Order:       "name",
	})
	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Name", Required: true}),
		orm.Many2one("product_id", "product.product", orm.FieldOpts{String: "Product", Required: true}),
		orm.Many2one("warehouse_id", "stock.warehouse", orm.FieldOpts{String: "Warehouse", Required: true}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{String: "Location", Required: true}),
		orm.Float("product_min_qty", orm.FieldOpts{String: "Minimum Quantity"}),
		orm.Float("product_max_qty", orm.FieldOpts{String: "Maximum Quantity"}),
		orm.Float("qty_multiple", orm.FieldOpts{String: "Quantity Multiple", Default: 1}),
		orm.Float("qty_on_hand", orm.FieldOpts{String: "On Hand", Compute: "_compute_qty", Store: false}),
		orm.Float("qty_forecast", orm.FieldOpts{String: "Forecast", Compute: "_compute_qty", Store: false}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
	)

	// Compute on-hand qty from quants
	m.RegisterCompute("qty_on_hand", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		opID := rs.IDs()[0]
		var productID, locationID int64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT product_id, location_id FROM stock_warehouse_orderpoint WHERE id = $1`, opID,
		).Scan(&productID, &locationID)

		var qty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(quantity - reserved_quantity), 0) FROM stock_quant WHERE product_id = $1 AND location_id = $2`,
			productID, locationID,
		).Scan(&qty)
		return orm.Values{"qty_on_hand": qty, "qty_forecast": qty}, nil
	})

	// action_replenish: check all orderpoints and create procurement if below min.
	// Mirrors: odoo/addons/stock/models/stock_orderpoint.py action_replenish()
	m.RegisterMethod("action_replenish", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, opID := range rs.IDs() {
			var productID, locationID int64
			var minQty, maxQty, qtyMultiple float64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT product_id, location_id, product_min_qty, product_max_qty, qty_multiple
				 FROM stock_warehouse_orderpoint WHERE id = $1`, opID,
			).Scan(&productID, &locationID, &minQty, &maxQty, &qtyMultiple)

			// Check current stock
			var onHand float64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(SUM(quantity - reserved_quantity), 0) FROM stock_quant WHERE product_id = $1 AND location_id = $2`,
				productID, locationID,
			).Scan(&onHand)

			if onHand < minQty {
				// Need to replenish: qty = max - on_hand, rounded up to qty_multiple
				needed := maxQty - onHand
				if qtyMultiple > 0 {
					remainder := int(needed) % int(qtyMultiple)
					if remainder > 0 {
						needed += qtyMultiple - float64(remainder)
					}
				}

				// Create internal transfer or purchase (simplified: just log)
				fmt.Printf("stock: orderpoint %d needs %.0f units of product %d\n", opID, needed, productID)
			}
		}
		return true, nil
	})
}

// initStockScrap registers stock.scrap — scrap/disposal of products.
// Mirrors: odoo/addons/stock/models/stock_scrap.py
func initStockScrap() {
	m := orm.NewModel("stock.scrap", orm.ModelOpts{
		Description: "Scrap",
		Order:       "name desc",
	})
	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Reference", Readonly: true, Default: "New"}),
		orm.Many2one("product_id", "product.product", orm.FieldOpts{String: "Product", Required: true}),
		orm.Float("scrap_qty", orm.FieldOpts{String: "Quantity", Required: true, Default: 1}),
		orm.Many2one("lot_id", "stock.lot", orm.FieldOpts{String: "Lot/Serial"}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{String: "Source Location", Required: true}),
		orm.Many2one("scrap_location_id", "stock.location", orm.FieldOpts{String: "Scrap Location", Required: true}),
		orm.Many2one("picking_id", "stock.picking", orm.FieldOpts{String: "Picking"}),
		orm.Many2one("move_id", "stock.move", orm.FieldOpts{String: "Scrap Move"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Date("date_done", orm.FieldOpts{String: "Date"}),
		orm.Selection("state", []orm.SelectionItem{
			{Value: "draft", Label: "Draft"},
			{Value: "done", Label: "Done"},
		}, orm.FieldOpts{String: "Status", Default: "draft"}),
	)

	// action_validate: Validate scrap, move product from source to scrap location.
	// Mirrors: odoo/addons/stock/models/stock_scrap.py StockScrap.action_validate()
	m.RegisterMethod("action_validate", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, scrapID := range rs.IDs() {
			var productID, locID, scrapLocID int64
			var qty float64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT product_id, scrap_qty, location_id, scrap_location_id FROM stock_scrap WHERE id = $1`,
				scrapID).Scan(&productID, &qty, &locID, &scrapLocID)

			// Update quants (move from location to scrap location)
			if err := updateQuant(env, productID, locID, -qty); err != nil {
				return nil, fmt.Errorf("stock.scrap: update source quant for scrap %d: %w", scrapID, err)
			}
			if err := updateQuant(env, productID, scrapLocID, qty); err != nil {
				return nil, fmt.Errorf("stock.scrap: update scrap quant for scrap %d: %w", scrapID, err)
			}

			_, err := env.Tx().Exec(env.Ctx(),
				`UPDATE stock_scrap SET state = 'done', date_done = NOW() WHERE id = $1`, scrapID)
			if err != nil {
				return nil, fmt.Errorf("stock.scrap: validate scrap %d: %w", scrapID, err)
			}
		}
		return true, nil
	})
}

// initStockInventory registers stock.quant.adjust — inventory adjustment wizard.
// Mirrors: odoo/addons/stock/wizard/stock_change_product_qty.py (transient model)
func initStockInventory() {
	m := orm.NewModel("stock.quant.adjust", orm.ModelOpts{
		Description: "Inventory Adjustment",
		Type:        orm.ModelTransient,
	})
	m.AddFields(
		orm.Many2one("product_id", "product.product", orm.FieldOpts{String: "Product", Required: true}),
		orm.Many2one("location_id", "stock.location", orm.FieldOpts{String: "Location", Required: true}),
		orm.Float("new_quantity", orm.FieldOpts{String: "New Quantity", Required: true}),
		orm.Many2one("lot_id", "stock.lot", orm.FieldOpts{String: "Lot/Serial"}),
	)

	// action_apply: Set quant quantity to the specified new quantity.
	// Mirrors: stock.change.product.qty.change_product_qty()
	m.RegisterMethod("action_apply", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		data, err := rs.Read([]string{"product_id", "location_id", "new_quantity"})
		if err != nil || len(data) == 0 {
			return nil, err
		}
		d := data[0]

		productID := toInt64(d["product_id"])
		locationID := toInt64(d["location_id"])
		newQty, _ := d["new_quantity"].(float64)

		// Get current quantity
		var currentQty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(quantity), 0) FROM stock_quant WHERE product_id = $1 AND location_id = $2`,
			productID, locationID).Scan(&currentQty)

		diff := newQty - currentQty
		if diff != 0 {
			if err := updateQuant(env, productID, locationID, diff); err != nil {
				return nil, fmt.Errorf("stock.quant.adjust: update quant: %w", err)
			}
		}

		return map[string]interface{}{"type": "ir.actions.act_window_close"}, nil
	})
}

// initStockRule registers stock.rule — procurement/push/pull rules.
// Mirrors: odoo/addons/stock/models/stock_rule.py
func initStockRule() {
	m := orm.NewModel("stock.rule", orm.ModelOpts{
		Description: "Stock Rule",
		Order:       "sequence, id",
	})
	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Name", Required: true}),
		orm.Selection("action", []orm.SelectionItem{
			{Value: "pull", Label: "Pull From"},
			{Value: "push", Label: "Push To"},
			{Value: "pull_push", Label: "Pull & Push"},
			{Value: "buy", Label: "Buy"},
			{Value: "manufacture", Label: "Manufacture"},
		}, orm.FieldOpts{String: "Action", Required: true}),
		orm.Many2one("location_src_id", "stock.location", orm.FieldOpts{String: "Source Location"}),
		orm.Many2one("location_dest_id", "stock.location", orm.FieldOpts{String: "Destination Location"}),
		orm.Many2one("route_id", "stock.route", orm.FieldOpts{String: "Route"}),
		orm.Many2one("picking_type_id", "stock.picking.type", orm.FieldOpts{String: "Operation Type"}),
		orm.Many2one("warehouse_id", "stock.warehouse", orm.FieldOpts{String: "Warehouse"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 20}),
		orm.Integer("delay", orm.FieldOpts{String: "Delay (days)"}),
		orm.Selection("procure_method", []orm.SelectionItem{
			{Value: "make_to_stock", Label: "Take From Stock"},
			{Value: "make_to_order", Label: "Trigger Another Rule"},
			{Value: "mts_else_mto", Label: "Take from Stock, if unavailable, Trigger Another Rule"},
		}, orm.FieldOpts{String: "Supply Method", Default: "make_to_stock"}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
	)
	_ = m
}

// initStockRoute registers stock.route — inventory routes linking rules.
// Mirrors: odoo/addons/stock/models/stock_route.py
func initStockRoute() {
	m := orm.NewModel("stock.route", orm.ModelOpts{
		Description: "Inventory Route",
		Order:       "sequence, id",
	})
	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Route", Required: true, Translate: true}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 0}),
		orm.One2many("rule_ids", "stock.rule", "route_id", orm.FieldOpts{String: "Rules"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Boolean("product_selectable", orm.FieldOpts{String: "Applicable on Product", Default: true}),
		orm.Boolean("product_categ_selectable", orm.FieldOpts{String: "Applicable on Product Category"}),
		orm.Boolean("warehouse_selectable", orm.FieldOpts{String: "Applicable on Warehouse"}),
		orm.Many2many("warehouse_ids", "stock.warehouse", orm.FieldOpts{String: "Warehouses"}),
	)
	_ = m
}

// initProductStockExtension extends product.template with stock-specific fields.
// Mirrors: odoo/addons/stock/models/product.py (tracking, route_ids)
func initProductStockExtension() {
	pt := orm.ExtendModel("product.template")
	pt.AddFields(
		orm.Selection("tracking", []orm.SelectionItem{
			{Value: "none", Label: "No Tracking"},
			{Value: "lot", Label: "By Lots"},
			{Value: "serial", Label: "By Unique Serial Number"},
		}, orm.FieldOpts{String: "Tracking", Default: "none"}),
		orm.Many2many("route_ids", "stock.route", orm.FieldOpts{String: "Routes"}),
	)
}

// toInt64 converts various numeric types to int64 for use in business methods.
func toInt64(v interface{}) int64 {
	switch n := v.(type) {
	case int64:
		return n
	case float64:
		return int64(n)
	case int:
		return int64(n)
	case int32:
		return int64(n)
	}
	return 0
}

// updatePickingStateFromMoves recomputes and writes the picking state based on
// the aggregate states of its stock moves.
// If all moves done → done, all cancelled → cancel, all assigned+done+cancel → assigned, else confirmed.
// Mirrors: stock.picking._compute_state()
func updatePickingStateFromMoves(env *orm.Environment, pickingID int64) error {
	var total, draftCount, cancelCount, doneCount, assignedCount int64
	err := env.Tx().QueryRow(env.Ctx(),
		`SELECT COUNT(*),
		        COUNT(*) FILTER (WHERE state = 'draft'),
		        COUNT(*) FILTER (WHERE state = 'cancel'),
		        COUNT(*) FILTER (WHERE state = 'done'),
		        COUNT(*) FILTER (WHERE state = 'assigned')
		 FROM stock_move WHERE picking_id = $1`, pickingID,
	).Scan(&total, &draftCount, &cancelCount, &doneCount, &assignedCount)
	if err != nil {
		return fmt.Errorf("updatePickingStateFromMoves: query move states for picking %d: %w", pickingID, err)
	}

	var newState string
	switch {
	case total == 0 || draftCount > 0:
		newState = "draft"
	case cancelCount == total:
		newState = "cancel"
	case doneCount+cancelCount == total:
		newState = "done"
	case assignedCount+doneCount+cancelCount == total:
		newState = "assigned"
	default:
		newState = "confirmed"
	}

	_, err = env.Tx().Exec(env.Ctx(),
		`UPDATE stock_picking SET state = $1 WHERE id = $2`, newState, pickingID)
	if err != nil {
		return fmt.Errorf("updatePickingStateFromMoves: update picking %d to %s: %w", pickingID, newState, err)
	}
	// If done, also set date_done
	if newState == "done" {
		env.Tx().Exec(env.Ctx(),
			`UPDATE stock_picking SET date_done = NOW() WHERE id = $1 AND date_done IS NULL`, pickingID)
	}
	return nil
}

// propagateChainedMove checks for push rules on the destination location and
// auto-creates a chained move if a stock.rule exists for the route.
// This implements multi-location transfer propagation between warehouses.
// Mirrors: stock.move._push_apply() / _action_done chain
func propagateChainedMove(env *orm.Environment, moveID, productID, destLocationID int64, qty float64) error {
	// Look for a push rule where location_src_id = destLocationID
	var ruleID, nextDestID, pickingTypeID int64
	var delay int
	err := env.Tx().QueryRow(env.Ctx(),
		`SELECT sr.id, sr.location_dest_id, sr.picking_type_id, COALESCE(sr.delay, 0)
		 FROM stock_rule sr
		 WHERE sr.location_src_id = $1
		   AND sr.action IN ('push', 'pull_push')
		   AND sr.active = true
		 ORDER BY sr.sequence LIMIT 1`,
		destLocationID,
	).Scan(&ruleID, &nextDestID, &pickingTypeID, &delay)
	if err != nil {
		return nil // No push rule found — this is normal, not an error
	}
	if ruleID == 0 || nextDestID == 0 {
		return nil
	}

	// Find or create a picking for the chained move
	var chainedPickingID int64
	err = env.Tx().QueryRow(env.Ctx(),
		`SELECT id FROM stock_picking
		 WHERE picking_type_id = $1 AND location_id = $2 AND location_dest_id = $3
		   AND state = 'draft'
		 ORDER BY id DESC LIMIT 1`,
		pickingTypeID, destLocationID, nextDestID,
	).Scan(&chainedPickingID)

	if chainedPickingID == 0 {
		// Create a new picking
		var companyID int64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(company_id, 1) FROM stock_picking_type WHERE id = $1`, pickingTypeID,
		).Scan(&companyID)
		if companyID == 0 {
			companyID = 1
		}

		scheduled := time.Now().AddDate(0, 0, delay).Format("2006-01-02")
		pickVals := orm.Values{
			"picking_type_id":  pickingTypeID,
			"location_id":      destLocationID,
			"location_dest_id": nextDestID,
			"company_id":       companyID,
			"state":            "draft",
			"scheduled_date":   scheduled,
			"origin":           fmt.Sprintf("Chain from move %d", moveID),
		}
		pickRS, err := env.Model("stock.picking").Create(pickVals)
		if err != nil {
			return fmt.Errorf("propagateChainedMove: create picking: %w", err)
		}
		chainedPickingID = pickRS.ID()
	}

	// Create the chained move
	scheduled := time.Now().AddDate(0, 0, delay)
	_, err = env.Model("stock.move").Create(orm.Values{
		"name":             fmt.Sprintf("Chained: product %d from rule %d", productID, ruleID),
		"product_id":       productID,
		"product_uom_qty":  qty,
		"product_uom":      int64(1), // default UoM
		"location_id":      destLocationID,
		"location_dest_id": nextDestID,
		"picking_id":       chainedPickingID,
		"company_id":       int64(1),
		"state":            "draft",
		"date":             scheduled,
		"origin":           fmt.Sprintf("Chain from move %d", moveID),
	})
	if err != nil {
		return fmt.Errorf("propagateChainedMove: create chained move: %w", err)
	}

	log.Printf("stock: created chained move for product %d from location %d to %d (rule %d)", productID, destLocationID, nextDestID, ruleID)
	return nil
}

// enforceSerialLotTracking validates that move lines have required lot/serial numbers.
// Products with tracking = 'lot' or 'serial' must have lot_id set on their move lines.
// Mirrors: odoo/addons/stock/models/stock_picking.py _check_move_lines_map_quant()
func enforceSerialLotTracking(env *orm.Environment, pickingID int64) error {
	rows, err := env.Tx().Query(env.Ctx(),
		`SELECT sml.id, COALESCE(pt.name, ''), COALESCE(pt.tracking, 'none'), sml.lot_id
		 FROM stock_move_line sml
		 JOIN stock_move sm ON sm.id = sml.move_id
		 LEFT JOIN product_product pp ON pp.id = sml.product_id
		 LEFT JOIN product_template pt ON pt.id = pp.product_tmpl_id
		 WHERE sm.picking_id = $1 AND sm.state NOT IN ('done', 'cancel')
		   AND sml.quantity > 0`, pickingID)
	if err != nil {
		log.Printf("stock: serial/lot tracking query failed for picking %d: %v", pickingID, err)
		return fmt.Errorf("stock: cannot verify lot/serial tracking: %w", err)
	}
	defer rows.Close()

	for rows.Next() {
		var lineID int64
		var productName, tracking string
		var lotID *int64
		if err := rows.Scan(&lineID, &productName, &tracking, &lotID); err != nil {
			continue
		}
		if (tracking == "lot" || tracking == "serial") && (lotID == nil || *lotID == 0) {
			return fmt.Errorf("stock: product '%s' requires a lot/serial number (tracking=%s) on move line %d", productName, tracking, lineID)
		}
	}
	return nil
}