package models

import (
	"fmt"
	"time"

	"odoo-go/pkg/orm"
)

// initSaleOrderExtension extends sale.order with template support, additional workflow
// methods, and computed fields.
// Mirrors: odoo/addons/sale/models/sale_order.py (additional fields)
//          odoo/addons/sale_management/models/sale_order.py (template fields)
func initSaleOrderExtension() {
	so := orm.ExtendModel("sale.order")

	// -- Template & Additional Fields --
	so.AddFields(
		orm.Many2one("sale_order_template_id", "sale.order.template", orm.FieldOpts{
			String: "Quotation Template",
		}),
		orm.Boolean("is_expired", orm.FieldOpts{
			String: "Expired", Compute: "_compute_is_expired",
		}),
		orm.Char("client_order_ref", orm.FieldOpts{String: "Customer Reference"}),
		orm.Char("origin", orm.FieldOpts{String: "Source Document"}),
		orm.Boolean("locked", orm.FieldOpts{String: "Locked", Readonly: true}),
		orm.Many2one("user_id", "res.users", orm.FieldOpts{String: "Salesperson", Index: true}),
		orm.Many2one("team_id", "crm.team", orm.FieldOpts{String: "Sales Team"}),
		orm.Char("reference", orm.FieldOpts{String: "Payment Reference"}),
		orm.Datetime("commitment_date", orm.FieldOpts{String: "Delivery Date"}),
		orm.Datetime("date_last_order_followup", orm.FieldOpts{String: "Last Follow-up Date"}),
		orm.Text("internal_note", orm.FieldOpts{String: "Internal Note"}),
	)

	// -- Computed: is_expired --
	// An SO is expired when validity_date is in the past and state is still draft/sent.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder._compute_is_expired()
	so.RegisterCompute("is_expired", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		soID := rs.IDs()[0]
		var validityDate *time.Time
		var state string
		env.Tx().QueryRow(env.Ctx(),
			`SELECT validity_date, state FROM sale_order WHERE id = $1`, soID,
		).Scan(&validityDate, &state)

		expired := false
		if validityDate != nil && (state == "draft" || state == "sent") {
			expired = validityDate.Before(time.Now().Truncate(24 * time.Hour))
		}
		return orm.Values{"is_expired": expired}, nil
	})

	// -- Computed: _compute_invoice_status (extends the base) --
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder._compute_invoice_status()
	so.RegisterCompute("invoice_status", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		soID := rs.IDs()[0]

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

		// Only compute for confirmed/done orders
		if state != "sale" && state != "done" {
			return orm.Values{"invoice_status": "no"}, nil
		}

		// Check line quantities
		var totalQty, totalInvoiced float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(product_uom_qty), 0), COALESCE(SUM(qty_invoiced), 0)
			 FROM sale_order_line WHERE order_id = $1
			 AND (display_type IS NULL OR display_type = '' OR display_type = 'product')`,
			soID).Scan(&totalQty, &totalInvoiced)

		status := "no"
		if totalQty > 0 {
			if totalInvoiced >= totalQty {
				status = "invoiced"
			} else if totalInvoiced > 0 {
				status = "to invoice"
			} else {
				status = "to invoice"
			}
		}
		return orm.Values{"invoice_status": status}, nil
	})

	// action_quotation_sent: Mark the SO as "sent" (quotation has been emailed).
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_quotation_sent()
	so.RegisterMethod("action_quotation_sent", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, soID := range rs.IDs() {
			var state string
			env.Tx().QueryRow(env.Ctx(),
				`SELECT state FROM sale_order WHERE id = $1`, soID).Scan(&state)
			if state != "draft" {
				continue
			}
			env.Tx().Exec(env.Ctx(),
				`UPDATE sale_order SET state = 'sent' WHERE id = $1`, soID)
		}
		return true, nil
	})

	// action_lock: Lock a confirmed sale order to prevent modifications.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_lock()
	so.RegisterMethod("action_lock", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, soID := range rs.IDs() {
			env.Tx().Exec(env.Ctx(),
				`UPDATE sale_order SET locked = true WHERE id = $1`, soID)
		}
		return true, nil
	})

	// action_unlock: Unlock a confirmed sale order.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_unlock()
	so.RegisterMethod("action_unlock", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, soID := range rs.IDs() {
			env.Tx().Exec(env.Ctx(),
				`UPDATE sale_order SET locked = false WHERE id = $1`, soID)
		}
		return true, nil
	})

	// action_view_delivery: Open delivery orders linked to this sale order.
	// Mirrors: odoo/addons/sale_stock/models/sale_order.py SaleOrder.action_view_delivery()
	so.RegisterMethod("action_view_delivery", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		soID := rs.IDs()[0]
		var soName string
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(name, '') FROM sale_order WHERE id = $1`, soID).Scan(&soName)

		rows, err := env.Tx().Query(env.Ctx(),
			`SELECT id FROM stock_picking WHERE origin = $1`, soName)
		if err != nil {
			return nil, fmt.Errorf("sale: view delivery query: %w", err)
		}
		defer rows.Close()

		var pickingIDs []interface{}
		for rows.Next() {
			var id int64
			rows.Scan(&id)
			pickingIDs = append(pickingIDs, id)
		}

		if len(pickingIDs) == 1 {
			return map[string]interface{}{
				"type": "ir.actions.act_window", "res_model": "stock.picking",
				"res_id": pickingIDs[0], "view_mode": "form",
				"views": [][]interface{}{{nil, "form"}}, "target": "current",
			}, nil
		}
		return map[string]interface{}{
			"type": "ir.actions.act_window", "res_model": "stock.picking",
			"view_mode": "list,form", "views": [][]interface{}{{nil, "list"}, {nil, "form"}},
			"domain": []interface{}{[]interface{}{"id", "in", pickingIDs}}, "target": "current",
		}, nil
	})

	// preview_quotation: Generate a preview URL for the quotation portal.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.preview_sale_order()
	so.RegisterMethod("preview_quotation", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		soID := rs.IDs()[0]
		return map[string]interface{}{
			"type":   "ir.actions.act_url",
			"url":    fmt.Sprintf("/my/orders/%d", soID),
			"target": "new",
		}, nil
	})

	// action_open_discount_wizard: Open the discount wizard.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_open_discount_wizard()
	so.RegisterMethod("action_open_discount_wizard", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		return map[string]interface{}{
			"type":      "ir.actions.act_window",
			"res_model": "sale.order.discount",
			"view_mode": "form",
			"target":    "new",
		}, nil
	})

	// _get_order_confirmation_date: Return the date when the SO was confirmed.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder._get_order_confirmation_date()
	so.RegisterMethod("_get_order_confirmation_date", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		soID := rs.IDs()[0]
		var dateOrder *time.Time
		var state string
		env.Tx().QueryRow(env.Ctx(),
			`SELECT date_order, state FROM sale_order WHERE id = $1`, soID).Scan(&dateOrder, &state)
		if state == "sale" || state == "done" {
			return dateOrder, nil
		}
		return nil, nil
	})

	// _compute_amount_to_invoice: Compute total amount still to invoice.
	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder._compute_amounts()
	so.RegisterMethod("_compute_amount_to_invoice", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		soID := rs.IDs()[0]
		var total, invoiced float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(price_subtotal::float8), 0),
				COALESCE(SUM(qty_invoiced * price_unit * (1 - COALESCE(discount,0)/100))::float8, 0)
			 FROM sale_order_line WHERE order_id = $1
			 AND (display_type IS NULL OR display_type = '' OR display_type = 'product')`,
			soID).Scan(&total, &invoiced)
		return total - invoiced, nil
	})
}

// initSaleOrderLineExtension extends sale.order.line with additional fields and methods.
// Mirrors: odoo/addons/sale/models/sale_order_line.py (additional fields)
func initSaleOrderLineExtension() {
	sol := orm.ExtendModel("sale.order.line")

	sol.AddFields(
		orm.Many2one("salesman_id", "res.users", orm.FieldOpts{String: "Salesperson"}),
		orm.Selection("invoice_status", []orm.SelectionItem{
			{Value: "upselling", Label: "Upselling Opportunity"},
			{Value: "invoiced", Label: "Fully Invoiced"},
			{Value: "to invoice", Label: "To Invoice"},
			{Value: "no", Label: "Nothing to Invoice"},
		}, orm.FieldOpts{String: "Invoice Status", Compute: "_compute_invoice_status_line"}),
		orm.Boolean("is_downpayment", orm.FieldOpts{String: "Is a down payment"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
		orm.Float("product_packaging_qty", orm.FieldOpts{String: "Packaging Quantity"}),
		orm.Char("product_type", orm.FieldOpts{String: "Product Type"}),
		orm.Boolean("product_updatable", orm.FieldOpts{String: "Can Edit Product", Default: true}),
		orm.Float("price_reduce", orm.FieldOpts{
			String: "Price Reduce", Compute: "_compute_price_reduce",
		}),
		orm.Float("price_reduce_taxinc", orm.FieldOpts{
			String: "Price Reduce Tax inc", Compute: "_compute_price_reduce_taxinc",
		}),
		orm.Float("price_reduce_taxexcl", orm.FieldOpts{
			String: "Price Reduce Tax excl", Compute: "_compute_price_reduce_taxexcl",
		}),
		orm.Monetary("untaxed_amount_to_invoice", orm.FieldOpts{
			String: "Untaxed Amount To Invoice", Compute: "_compute_untaxed_amount_to_invoice",
			CurrencyField: "currency_id",
		}),
		orm.Monetary("untaxed_amount_invoiced", orm.FieldOpts{
			String: "Untaxed Amount Invoiced", Compute: "_compute_untaxed_amount_invoiced",
			CurrencyField: "currency_id",
		}),
	)

	// _compute_invoice_status_line: Per-line invoice status.
	// Mirrors: odoo/addons/sale/models/sale_order_line.py SaleOrderLine._compute_invoice_status()
	sol.RegisterCompute("invoice_status", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]

		var qty, qtyInvoiced float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(product_uom_qty, 0), COALESCE(qty_invoiced, 0)
			 FROM sale_order_line WHERE id = $1`, lineID,
		).Scan(&qty, &qtyInvoiced)

		status := "no"
		if qty > 0 {
			if qtyInvoiced >= qty {
				status = "invoiced"
			} else {
				status = "to invoice"
			}
		}
		return orm.Values{"invoice_status": status}, nil
	})

	// _compute_price_reduce: Unit price after discount.
	sol.RegisterCompute("price_reduce", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var price, discount float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(price_unit, 0), COALESCE(discount, 0) FROM sale_order_line WHERE id = $1`,
			lineID).Scan(&price, &discount)
		return orm.Values{"price_reduce": price * (1 - discount/100)}, nil
	})

	// _compute_price_reduce_taxinc: Reduced price including taxes.
	sol.RegisterCompute("price_reduce_taxinc", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var priceTotal, qty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(price_total, 0), COALESCE(product_uom_qty, 1) FROM sale_order_line WHERE id = $1`,
			lineID).Scan(&priceTotal, &qty)
		val := float64(0)
		if qty > 0 {
			val = priceTotal / qty
		}
		return orm.Values{"price_reduce_taxinc": val}, nil
	})

	// _compute_price_reduce_taxexcl: Reduced price excluding taxes.
	sol.RegisterCompute("price_reduce_taxexcl", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var priceSubtotal, qty float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(price_subtotal, 0), COALESCE(product_uom_qty, 1) FROM sale_order_line WHERE id = $1`,
			lineID).Scan(&priceSubtotal, &qty)
		val := float64(0)
		if qty > 0 {
			val = priceSubtotal / qty
		}
		return orm.Values{"price_reduce_taxexcl": val}, nil
	})

	// _compute_untaxed_amount_to_invoice
	sol.RegisterCompute("untaxed_amount_to_invoice", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var qty, qtyInvoiced, price, discount float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(product_uom_qty, 0), COALESCE(qty_invoiced, 0),
				COALESCE(price_unit, 0), COALESCE(discount, 0)
			 FROM sale_order_line WHERE id = $1`, lineID,
		).Scan(&qty, &qtyInvoiced, &price, &discount)
		remaining := qty - qtyInvoiced
		if remaining < 0 {
			remaining = 0
		}
		return orm.Values{"untaxed_amount_to_invoice": remaining * price * (1 - discount/100)}, nil
	})

	// _compute_untaxed_amount_invoiced
	sol.RegisterCompute("untaxed_amount_invoiced", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var qtyInvoiced, price, discount float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(qty_invoiced, 0), COALESCE(price_unit, 0), COALESCE(discount, 0)
			 FROM sale_order_line WHERE id = $1`, lineID,
		).Scan(&qtyInvoiced, &price, &discount)
		return orm.Values{"untaxed_amount_invoiced": qtyInvoiced * price * (1 - discount/100)}, nil
	})

	// _compute_qty_invoiced: Compute invoiced quantity from linked invoice lines.
	// Mirrors: odoo/addons/sale/models/sale_order_line.py SaleOrderLine._compute_qty_invoiced()
	sol.RegisterCompute("qty_invoiced", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var qtyInvoiced float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(qty_invoiced, 0) FROM sale_order_line WHERE id = $1`, lineID,
		).Scan(&qtyInvoiced)
		return orm.Values{"qty_invoiced": qtyInvoiced}, nil
	})

	// _compute_qty_to_invoice: Quantity to invoice = qty - qty_invoiced (if delivered policy: qty_delivered - qty_invoiced).
	// Mirrors: odoo/addons/sale/models/sale_order_line.py SaleOrderLine._compute_qty_to_invoice()
	sol.RegisterCompute("qty_to_invoice", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		lineID := rs.IDs()[0]
		var qty, qtyInvoiced float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(product_uom_qty, 0), COALESCE(qty_invoiced, 0)
			 FROM sale_order_line WHERE id = $1`, lineID,
		).Scan(&qty, &qtyInvoiced)
		toInvoice := qty - qtyInvoiced
		if toInvoice < 0 {
			toInvoice = 0
		}
		return orm.Values{"qty_to_invoice": toInvoice}, nil
	})
}

// initSaleOrderDiscount registers the sale.order.discount wizard.
// Mirrors: odoo/addons/sale/wizard/sale_order_discount.py
func initSaleOrderDiscount() {
	m := orm.NewModel("sale.order.discount", orm.ModelOpts{
		Description: "Sale Order Discount Wizard",
		Type:        orm.ModelTransient,
	})

	m.AddFields(
		orm.Float("discount", orm.FieldOpts{String: "Discount (%)", Required: true}),
		orm.Many2one("sale_order_id", "sale.order", orm.FieldOpts{String: "Sale Order"}),
	)

	// action_apply_discount: Apply the discount to all lines of the SO.
	// Mirrors: odoo/addons/sale/wizard/sale_order_discount.py action_apply_discount()
	m.RegisterMethod("action_apply_discount", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		wizID := rs.IDs()[0]
		var discount float64
		var orderID int64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(discount, 0), COALESCE(sale_order_id, 0)
			 FROM sale_order_discount WHERE id = $1`, wizID,
		).Scan(&discount, &orderID)

		if orderID == 0 {
			return nil, fmt.Errorf("sale_discount: no sale order linked")
		}

		_, err := env.Tx().Exec(env.Ctx(),
			`UPDATE sale_order_line SET discount = $1
			 WHERE order_id = $2
			 AND (display_type IS NULL OR display_type = '' OR display_type = 'product')`,
			discount, orderID)
		if err != nil {
			return nil, fmt.Errorf("sale_discount: apply discount: %w", err)
		}

		return true, nil
	})
}

// initResPartnerSaleExtension2 adds additional sale-specific computed fields to res.partner.
// Mirrors: odoo/addons/sale/models/res_partner.py (additional fields)
func initResPartnerSaleExtension2() {
	partner := orm.ExtendModel("res.partner")

	partner.AddFields(
		orm.Monetary("sale_order_total", orm.FieldOpts{
			String: "Total Sales", Compute: "_compute_sale_order_total", CurrencyField: "currency_id",
		}),
	)

	partner.RegisterCompute("sale_order_total", func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		partnerID := rs.IDs()[0]
		var total float64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT COALESCE(SUM(amount_total::float8), 0) FROM sale_order
			 WHERE partner_id = $1 AND state IN ('sale', 'done')`, partnerID,
		).Scan(&total)
		return orm.Values{"sale_order_total": total}, nil
	})
}