package models

import (
	"fmt"
	"time"

	"odoo-go/pkg/orm"
)

// initAccountJournal registers account.journal — where entries are posted.
// Mirrors: odoo/addons/account/models/account_journal.py
func initAccountJournal() {
	m := orm.NewModel("account.journal", orm.ModelOpts{
		Description: "Journal",
		Order:       "sequence, type, code",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Journal Name", Required: true, Translate: true}),
		orm.Char("code", orm.FieldOpts{String: "Short Code", Required: true, Size: 5}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
		orm.Selection("type", []orm.SelectionItem{
			{Value: "sale", Label: "Sales"},
			{Value: "purchase", Label: "Purchase"},
			{Value: "cash", Label: "Cash"},
			{Value: "bank", Label: "Bank"},
			{Value: "general", Label: "Miscellaneous"},
			{Value: "credit", Label: "Credit Card"},
		}, orm.FieldOpts{String: "Type", Required: true}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company", Required: true}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
		orm.Many2one("default_account_id", "account.account", orm.FieldOpts{String: "Default Account"}),
		orm.Many2one("suspense_account_id", "account.account", orm.FieldOpts{String: "Suspense Account"}),
		orm.Many2one("profit_account_id", "account.account", orm.FieldOpts{String: "Profit Account"}),
		orm.Many2one("loss_account_id", "account.account", orm.FieldOpts{String: "Loss Account"}),
		orm.Many2one("sequence_id", "ir.sequence", orm.FieldOpts{String: "Entry Sequence"}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
		orm.Integer("color", orm.FieldOpts{String: "Color"}),
		orm.Char("bank_acc_number", orm.FieldOpts{String: "Account Number"}),
		orm.Many2one("bank_id", "res.bank", orm.FieldOpts{String: "Bank"}),
		orm.Many2one("bank_account_id", "res.partner.bank", orm.FieldOpts{String: "Bank Account"}),
		orm.Boolean("restrict_mode_hash_table", orm.FieldOpts{String: "Lock Posted Entries with Hash"}),
	)
}

// initAccountMove registers account.move — the core journal entry / invoice model.
// Mirrors: odoo/addons/account/models/account_move.py
//
// account.move is THE central model in Odoo accounting. It represents:
// - Journal entries (manual bookkeeping)
// - Customer invoices / credit notes
// - Vendor bills / refunds
// - Receipts
func initAccountMove() {
	m := orm.NewModel("account.move", orm.ModelOpts{
		Description: "Journal Entry",
		Order:       "date desc, name desc, id desc",
		RecName:     "name",
	})

	// -- Identity --
	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Number", Index: true, Readonly: true, Default: "/"}),
		orm.Date("date", orm.FieldOpts{String: "Date", Required: true, Index: true}),
		orm.Char("ref", orm.FieldOpts{String: "Reference"}),
	)

	// -- Type & State --
	m.AddFields(
		orm.Selection("move_type", []orm.SelectionItem{
			{Value: "entry", Label: "Journal Entry"},
			{Value: "out_invoice", Label: "Customer Invoice"},
			{Value: "out_refund", Label: "Customer Credit Note"},
			{Value: "in_invoice", Label: "Vendor Bill"},
			{Value: "in_refund", Label: "Vendor Credit Note"},
			{Value: "out_receipt", Label: "Sales Receipt"},
			{Value: "in_receipt", Label: "Purchase Receipt"},
		}, orm.FieldOpts{String: "Type", Required: true, Default: "entry", Index: true}),
		orm.Selection("state", []orm.SelectionItem{
			{Value: "draft", Label: "Draft"},
			{Value: "posted", Label: "Posted"},
			{Value: "cancel", Label: "Cancelled"},
		}, orm.FieldOpts{String: "Status", Default: "draft", Required: true, Readonly: true, Index: true}),
		orm.Selection("payment_state", []orm.SelectionItem{
			{Value: "not_paid", Label: "Not Paid"},
			{Value: "in_payment", Label: "In Payment"},
			{Value: "paid", Label: "Paid"},
			{Value: "partial", Label: "Partially Paid"},
			{Value: "reversed", Label: "Reversed"},
			{Value: "blocked", Label: "Blocked"},
		}, orm.FieldOpts{String: "Payment Status", Compute: "_compute_payment_state", Store: true}),
	)

	// -- Relationships --
	m.AddFields(
		orm.Many2one("journal_id", "account.journal", orm.FieldOpts{
			String: "Journal", Required: true, Index: true,
		}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{
			String: "Company", Required: true, Index: true,
		}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{
			String: "Currency", Required: true,
		}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{
			String: "Partner", Index: true,
		}),
		orm.Many2one("commercial_partner_id", "res.partner", orm.FieldOpts{
			String: "Commercial Entity", Related: "partner_id.commercial_partner_id",
		}),
		orm.Many2one("fiscal_position_id", "account.fiscal.position", orm.FieldOpts{
			String: "Fiscal Position",
		}),
		orm.Many2one("partner_bank_id", "res.partner.bank", orm.FieldOpts{
			String: "Recipient Bank",
		}),
	)

	// -- Lines --
	m.AddFields(
		orm.One2many("line_ids", "account.move.line", "move_id", orm.FieldOpts{
			String: "Journal Items",
		}),
		orm.One2many("invoice_line_ids", "account.move.line", "move_id", orm.FieldOpts{
			String: "Invoice Lines",
		}),
	)

	// -- Amounts (Computed) --
	m.AddFields(
		orm.Monetary("amount_untaxed", orm.FieldOpts{String: "Untaxed Amount", Compute: "_compute_amount", Store: true, CurrencyField: "currency_id"}),
		orm.Monetary("amount_tax", orm.FieldOpts{String: "Tax", Compute: "_compute_amount", Store: true, CurrencyField: "currency_id"}),
		orm.Monetary("amount_total", orm.FieldOpts{String: "Total", Compute: "_compute_amount", Store: true, CurrencyField: "currency_id"}),
		orm.Monetary("amount_residual", orm.FieldOpts{String: "Amount Due", Compute: "_compute_amount", Store: true, CurrencyField: "currency_id"}),
		orm.Monetary("amount_total_in_currency_signed", orm.FieldOpts{String: "Total in Currency Signed", Compute: "_compute_amount", Store: true}),
	)

	// -- Invoice specific --
	m.AddFields(
		orm.Date("invoice_date", orm.FieldOpts{String: "Invoice/Bill Date"}),
		orm.Date("invoice_date_due", orm.FieldOpts{String: "Due Date"}),
		orm.Char("invoice_origin", orm.FieldOpts{String: "Source Document"}),
		orm.Many2one("invoice_payment_term_id", "account.payment.term", orm.FieldOpts{
			String: "Payment Terms",
		}),
		orm.Text("narration", orm.FieldOpts{String: "Terms and Conditions"}),
	)

	// -- Technical --
	m.AddFields(
		orm.Boolean("auto_post", orm.FieldOpts{String: "Auto-post"}),
		orm.Char("sequence_prefix", orm.FieldOpts{String: "Sequence Prefix"}),
		orm.Integer("sequence_number", orm.FieldOpts{String: "Sequence Number"}),
	)

	// -- Computed Fields --
	// _compute_amount: sums invoice lines to produce totals.
	// Mirrors: odoo/addons/account/models/account_move.py AccountMove._compute_amount()
	//
	// Separates untaxed (product lines) from tax (tax lines) via display_type,
	// then derives total = untaxed + tax.
	computeAmount := func(rs *orm.Recordset) (orm.Values, error) {
		env := rs.Env()
		moveID := rs.IDs()[0]

		var untaxed, tax float64
		err := env.Tx().QueryRow(env.Ctx(),
			`SELECT
				COALESCE(SUM(CASE WHEN display_type IS NULL OR display_type = '' OR display_type = 'product' THEN ABS(balance) ELSE 0 END), 0),
				COALESCE(SUM(CASE WHEN display_type = 'tax' THEN ABS(balance) ELSE 0 END), 0)
			 FROM account_move_line WHERE move_id = $1`, moveID,
		).Scan(&untaxed, &tax)
		if err != nil {
			return nil, err
		}

		total := untaxed + tax

		return orm.Values{
			"amount_untaxed": untaxed,
			"amount_tax":     tax,
			"amount_total":   total,
			"amount_residual": total, // Simplified: residual = total until payments
		}, nil
	}

	m.RegisterCompute("amount_untaxed", computeAmount)
	m.RegisterCompute("amount_tax", computeAmount)
	m.RegisterCompute("amount_total", computeAmount)
	m.RegisterCompute("amount_residual", computeAmount)

	// -- Business Methods: State Transitions --
	// Mirrors: odoo/addons/account/models/account_move.py action_post(), button_cancel()

	// action_post: draft → posted
	m.RegisterMethod("action_post", 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 account_move WHERE id = $1`, id).Scan(&state)
			if err != nil {
				return nil, err
			}
			if state != "draft" {
				return nil, fmt.Errorf("account: can only post draft entries (current: %s)", state)
			}
			// Check balanced
			var debitSum, creditSum float64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(SUM(debit),0), COALESCE(SUM(credit),0)
				 FROM account_move_line WHERE move_id = $1`, id).Scan(&debitSum, &creditSum)
			diff := debitSum - creditSum
			if diff < -0.005 || diff > 0.005 {
				return nil, fmt.Errorf("account: cannot post unbalanced entry (debit=%.2f, credit=%.2f)", debitSum, creditSum)
			}
			if _, err := env.Tx().Exec(env.Ctx(),
				`UPDATE account_move SET state = 'posted' WHERE id = $1`, id); err != nil {
				return nil, err
			}
		}
		return true, nil
	})

	// button_cancel: posted → cancel (or draft → cancel)
	m.RegisterMethod("button_cancel", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, id := range rs.IDs() {
			if _, err := env.Tx().Exec(env.Ctx(),
				`UPDATE account_move SET state = 'cancel' WHERE id = $1`, id); err != nil {
				return nil, err
			}
		}
		return true, nil
	})

	// button_draft: cancel → draft
	m.RegisterMethod("button_draft", 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 account_move WHERE id = $1`, id).Scan(&state)
			if err != nil {
				return nil, err
			}
			if state != "cancel" {
				return nil, fmt.Errorf("account: can only reset cancelled entries to draft (current: %s)", state)
			}
			if _, err := env.Tx().Exec(env.Ctx(),
				`UPDATE account_move SET state = 'draft' WHERE id = $1`, id); err != nil {
				return nil, err
			}
		}
		return true, nil
	})

	// -- Business Method: create_invoice_with_tax --
	// Creates a customer invoice with automatic tax line generation.
	// For each product line that carries a tax_id, a separate tax line
	// (display_type='tax') is created. A receivable line balances the entry.
	//
	// args[0]: partner_id (int64 or float64)
	// args[1]: lines ([]interface{} of map[string]interface{})
	//          Each line: {name, quantity, price_unit, account_id, tax_id?}
	//
	// Returns: the created account.move ID (int64)
	m.RegisterMethod("create_invoice_with_tax", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		if len(args) < 2 {
			return nil, fmt.Errorf("account: create_invoice_with_tax requires partner_id and lines")
		}

		env := rs.Env()

		partnerID, ok := toInt64Arg(args[0])
		if !ok {
			return nil, fmt.Errorf("account: invalid partner_id")
		}

		rawLines, ok := args[1].([]interface{})
		if !ok {
			return nil, fmt.Errorf("account: lines must be a list")
		}

		// Step 1: Create the move header (draft invoice)
		moveRS := env.Model("account.move")
		moveVals := orm.Values{
			"move_type":  "out_invoice",
			"partner_id": partnerID,
		}
		move, err := moveRS.Create(moveVals)
		if err != nil {
			return nil, fmt.Errorf("account: create move: %w", err)
		}
		moveID := move.ID()

		// Retrieve company_id, journal_id, currency_id from the created move
		moveData, err := move.Read([]string{"company_id", "journal_id", "currency_id"})
		if err != nil || len(moveData) == 0 {
			return nil, fmt.Errorf("account: cannot read created move")
		}
		companyID, _ := toInt64Arg(moveData[0]["company_id"])
		journalID, _ := toInt64Arg(moveData[0]["journal_id"])
		currencyID, _ := toInt64Arg(moveData[0]["currency_id"])

		// Find the receivable account for the partner
		var receivableAccountID int64
		env.Tx().QueryRow(env.Ctx(),
			`SELECT id FROM account_account
			 WHERE account_type = 'asset_receivable' AND company_id = $1
			 ORDER BY code LIMIT 1`, companyID,
		).Scan(&receivableAccountID)
		if receivableAccountID == 0 {
			return nil, fmt.Errorf("account: no receivable account found for company %d", companyID)
		}

		lineRS := env.Model("account.move.line")

		var totalDebit float64 // sum of all product + tax debits

		// Step 2: For each input line, create product line(s) and tax line(s)
		for _, rawLine := range rawLines {
			lineMap, ok := rawLine.(map[string]interface{})
			if !ok {
				continue
			}

			name, _ := lineMap["name"].(string)
			quantity := floatArg(lineMap["quantity"], 1.0)
			priceUnit := floatArg(lineMap["price_unit"], 0.0)
			accountID, _ := toInt64Arg(lineMap["account_id"])
			taxID, hasTax := toInt64Arg(lineMap["tax_id"])

			if accountID == 0 {
				// Fallback: use journal default account
				env.Tx().QueryRow(env.Ctx(),
					`SELECT default_account_id FROM account_journal WHERE id = $1`, journalID,
				).Scan(&accountID)
			}
			if accountID == 0 {
				return nil, fmt.Errorf("account: no account_id for line %q", name)
			}

			baseAmount := priceUnit * quantity

			// Create product line (debit side for revenue)
			productLineVals := orm.Values{
				"move_id":      moveID,
				"name":         name,
				"quantity":     quantity,
				"price_unit":   priceUnit,
				"account_id":   accountID,
				"company_id":   companyID,
				"journal_id":   journalID,
				"currency_id":  currencyID,
				"partner_id":   partnerID,
				"display_type": "product",
				"debit":        0.0,
				"credit":       baseAmount,
				"balance":      -baseAmount,
			}
			if _, err := lineRS.Create(productLineVals); err != nil {
				return nil, fmt.Errorf("account: create product line: %w", err)
			}
			totalDebit += baseAmount

			// If a tax is specified, compute and create the tax line
			if hasTax && taxID > 0 {
				taxResult, err := ComputeTax(env, taxID, baseAmount)
				if err != nil {
					return nil, fmt.Errorf("account: compute tax: %w", err)
				}

				if taxResult.Amount != 0 && taxResult.AccountID != 0 {
					taxLineVals := orm.Values{
						"move_id":      moveID,
						"name":         taxResult.TaxName,
						"quantity":     1.0,
						"account_id":   taxResult.AccountID,
						"company_id":   companyID,
						"journal_id":   journalID,
						"currency_id":  currencyID,
						"partner_id":   partnerID,
						"display_type": "tax",
						"tax_line_id":  taxResult.TaxID,
						"debit":        0.0,
						"credit":       taxResult.Amount,
						"balance":      -taxResult.Amount,
					}
					if _, err := lineRS.Create(taxLineVals); err != nil {
						return nil, fmt.Errorf("account: create tax line: %w", err)
					}
					totalDebit += taxResult.Amount
				}
			}
		}

		// Step 3: Create the receivable line (debit = total of all credits)
		receivableVals := orm.Values{
			"move_id":      moveID,
			"name":         "/",
			"quantity":     1.0,
			"account_id":   receivableAccountID,
			"company_id":   companyID,
			"journal_id":   journalID,
			"currency_id":  currencyID,
			"partner_id":   partnerID,
			"display_type": "payment_term",
			"debit":        totalDebit,
			"credit":       0.0,
			"balance":      totalDebit,
		}
		if _, err := lineRS.Create(receivableVals); err != nil {
			return nil, fmt.Errorf("account: create receivable line: %w", err)
		}

		return moveID, nil
	})

	// -- Double-Entry Constraint --
	// SUM(debit) must equal SUM(credit) per journal entry.
	// Mirrors: odoo/addons/account/models/account_move.py _check_balanced()
	m.AddConstraint(func(rs *orm.Recordset) error {
		env := rs.Env()
		for _, id := range rs.IDs() {
			var debitSum, creditSum float64
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(SUM(debit), 0), COALESCE(SUM(credit), 0)
				 FROM account_move_line WHERE move_id = $1`, id,
			).Scan(&debitSum, &creditSum)
			if err != nil {
				return err
			}
			// Allow empty moves (no lines yet)
			if debitSum == 0 && creditSum == 0 {
				continue
			}
			diff := debitSum - creditSum
			if diff < -0.005 || diff > 0.005 {
				return fmt.Errorf("account: journal entry is unbalanced — debit=%.2f credit=%.2f (diff=%.2f)", debitSum, creditSum, diff)
			}
		}
		return nil
	})

	// -- DefaultGet: Provide dynamic defaults for new records --
	// Mirrors: odoo/addons/account/models/account_move.py AccountMove.default_get()
	// Supplies date, journal_id, company_id, currency_id when creating a new invoice.
	m.DefaultGet = func(env *orm.Environment, fields []string) orm.Values {
		vals := make(orm.Values)

		// Default date = today
		vals["date"] = time.Now().Format("2006-01-02")

		// Default company from the current user's session
		companyID := env.CompanyID()
		if companyID > 0 {
			vals["company_id"] = companyID
		}

		// Default journal: first active sales journal for the company
		var journalID int64
		err := env.Tx().QueryRow(env.Ctx(),
			`SELECT id FROM account_journal
			 WHERE type = 'sale' AND active = true AND company_id = $1
			 ORDER BY sequence, id LIMIT 1`, companyID).Scan(&journalID)
		if err == nil && journalID > 0 {
			vals["journal_id"] = journalID
		}

		// Default currency from the company
		var currencyID int64
		err = env.Tx().QueryRow(env.Ctx(),
			`SELECT currency_id FROM res_company WHERE id = $1`, companyID).Scan(&currencyID)
		if err == nil && currencyID > 0 {
			vals["currency_id"] = currencyID
		}

		return vals
	}

	// -- Onchange: partner_id → auto-fill partner address fields --
	// Mirrors: odoo/addons/account/models/account_move.py _onchange_partner_id()
	// When the partner changes on an invoice, look up the partner's address
	// and populate the commercial_partner_id field.
	m.RegisterOnchange("partner_id", func(env *orm.Environment, vals orm.Values) orm.Values {
		result := make(orm.Values)
		partnerID, ok := toInt64Arg(vals["partner_id"])
		if !ok || partnerID == 0 {
			return result
		}

		var name string
		var commercialID *int64
		err := env.Tx().QueryRow(env.Ctx(),
			`SELECT p.name, p.commercial_partner_id
			 FROM res_partner p WHERE p.id = $1`, partnerID,
		).Scan(&name, &commercialID)
		if err != nil {
			return result
		}

		if commercialID != nil && *commercialID > 0 {
			result["commercial_partner_id"] = *commercialID
		} else {
			result["commercial_partner_id"] = partnerID
		}
		return result
	})

	// -- Business Method: register_payment --
	// Create a payment for this invoice and reconcile.
	// Mirrors: odoo/addons/account/models/account_payment.py AccountPayment.action_register_payment()
	m.RegisterMethod("register_payment", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, moveID := range rs.IDs() {
			// Read invoice info
			var partnerID, journalID, companyID, currencyID int64
			var amountTotal float64
			var moveType string
			err := env.Tx().QueryRow(env.Ctx(),
				`SELECT COALESCE(partner_id,0), COALESCE(journal_id,0), COALESCE(company_id,0),
				 COALESCE(currency_id,0), COALESCE(amount_total,0), COALESCE(move_type,'entry')
				 FROM account_move WHERE id = $1`, moveID,
			).Scan(&partnerID, &journalID, &companyID, &currencyID, &amountTotal, &moveType)
			if err != nil {
				return nil, fmt.Errorf("account: read invoice %d for payment: %w", moveID, err)
			}

			// Determine payment type and partner type
			paymentType := "inbound"   // customer pays us
			partnerType := "customer"
			if moveType == "in_invoice" || moveType == "in_refund" {
				paymentType = "outbound" // we pay vendor
				partnerType = "supplier"
			}

			// Find bank journal
			var bankJournalID int64
			env.Tx().QueryRow(env.Ctx(),
				`SELECT id FROM account_journal WHERE type = 'bank' AND company_id = $1 LIMIT 1`,
				companyID).Scan(&bankJournalID)
			if bankJournalID == 0 {
				bankJournalID = journalID
			}

			// Create a journal entry for the payment
			var payMoveID int64
			err = env.Tx().QueryRow(env.Ctx(),
				`INSERT INTO account_move (name, move_type, state, date, partner_id, journal_id, company_id, currency_id)
				 VALUES ($1, 'entry', 'posted', NOW(), $2, $3, $4, $5) RETURNING id`,
				fmt.Sprintf("PAY/%d", moveID), partnerID, bankJournalID, companyID, currencyID,
			).Scan(&payMoveID)
			if err != nil {
				return nil, fmt.Errorf("account: create payment move for invoice %d: %w", moveID, err)
			}

			// Create payment record linked to the journal entry
			_, err = env.Tx().Exec(env.Ctx(),
				`INSERT INTO account_payment
				 (name, payment_type, partner_type, state, date, amount,
				  currency_id, journal_id, partner_id, company_id, move_id, is_reconciled)
				 VALUES ($1, $2, $3, 'paid', NOW(), $4, $5, $6, $7, $8, $9, true)`,
				fmt.Sprintf("PAY/%d", moveID), paymentType, partnerType, amountTotal,
				currencyID, bankJournalID, partnerID, companyID, payMoveID)
			if err != nil {
				return nil, fmt.Errorf("account: create payment for invoice %d: %w", moveID, err)
			}

			// Update invoice payment state
			_, err = env.Tx().Exec(env.Ctx(),
				`UPDATE account_move SET payment_state = 'paid' WHERE id = $1`, moveID)
			if err != nil {
				return nil, fmt.Errorf("account: update payment state for invoice %d: %w", moveID, err)
			}
		}
		return true, nil
	})

	// -- BeforeCreate Hook: Generate sequence number --
	m.BeforeCreate = func(env *orm.Environment, vals orm.Values) error {
		name, _ := vals["name"].(string)
		if name == "" || name == "/" {
			moveType, _ := vals["move_type"].(string)
			code := "account.move"
			switch moveType {
			case "out_invoice", "out_refund", "out_receipt":
				code = "account.move.out_invoice"
			case "in_invoice", "in_refund", "in_receipt":
				code = "account.move.in_invoice"
			}
			seq, err := orm.NextByCode(env, code)
			if err != nil {
				// Fallback to generic sequence
				seq, err = orm.NextByCode(env, "account.move")
				if err != nil {
					return nil // No sequence configured, keep "/"
				}
			}
			vals["name"] = seq
		}
		return nil
	}
}

// initAccountMoveLine registers account.move.line — journal items / invoice lines.
// Mirrors: odoo/addons/account/models/account_move_line.py
//
// CRITICAL: In double-entry bookkeeping, sum(debit) must equal sum(credit) per move.
func initAccountMoveLine() {
	m := orm.NewModel("account.move.line", orm.ModelOpts{
		Description: "Journal Item",
		Order:       "date desc, id",
	})

	// -- Parent --
	m.AddFields(
		orm.Many2one("move_id", "account.move", orm.FieldOpts{
			String: "Journal Entry", Required: true, OnDelete: orm.OnDeleteCascade, Index: true,
		}),
		orm.Char("move_name", orm.FieldOpts{String: "Journal Entry Name", Related: "move_id.name"}),
		orm.Date("date", orm.FieldOpts{String: "Date", Related: "move_id.date", Store: true, Index: true}),
		orm.Many2one("journal_id", "account.journal", orm.FieldOpts{String: "Journal", Index: true}),
	)

	// -- Accounts --
	m.AddFields(
		orm.Many2one("account_id", "account.account", orm.FieldOpts{
			String: "Account", Required: true, Index: true,
		}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{String: "Partner", Index: true}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company", Required: true}),
		orm.Many2one("company_currency_id", "res.currency", orm.FieldOpts{String: "Company Currency"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
	)

	// -- Amounts (Double-Entry) --
	m.AddFields(
		orm.Monetary("debit", orm.FieldOpts{String: "Debit", Default: 0.0, CurrencyField: "company_currency_id"}),
		orm.Monetary("credit", orm.FieldOpts{String: "Credit", Default: 0.0, CurrencyField: "company_currency_id"}),
		orm.Monetary("balance", orm.FieldOpts{String: "Balance", Compute: "_compute_balance", Store: true, CurrencyField: "company_currency_id"}),
		orm.Monetary("amount_currency", orm.FieldOpts{String: "Amount in Currency", CurrencyField: "currency_id"}),
		orm.Float("amount_residual", orm.FieldOpts{String: "Residual Amount"}),
		orm.Float("amount_residual_currency", orm.FieldOpts{String: "Residual Amount in Currency"}),
	)

	// -- Invoice line fields --
	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Label"}),
		orm.Float("quantity", orm.FieldOpts{String: "Quantity", Default: 1.0}),
		orm.Float("price_unit", orm.FieldOpts{String: "Unit Price"}),
		orm.Float("discount", orm.FieldOpts{String: "Discount (%)"}),
		orm.Float("price_subtotal", orm.FieldOpts{String: "Subtotal", Compute: "_compute_totals", Store: true}),
		orm.Float("price_total", orm.FieldOpts{String: "Total", Compute: "_compute_totals", Store: true}),
	)

	// -- Tax --
	m.AddFields(
		orm.Many2many("tax_ids", "account.tax", orm.FieldOpts{String: "Taxes"}),
		orm.Many2one("tax_line_id", "account.tax", orm.FieldOpts{String: "Originator Tax"}),
		orm.Many2one("tax_group_id", "account.tax.group", orm.FieldOpts{String: "Tax Group"}),
		orm.Many2one("tax_repartition_line_id", "account.tax.repartition.line", orm.FieldOpts{
			String: "Tax Repartition Line",
		}),
	)

	// -- Display --
	m.AddFields(
		orm.Selection("display_type", []orm.SelectionItem{
			{Value: "product", Label: "Product"},
			{Value: "cogs", Label: "COGS"},
			{Value: "tax", Label: "Tax"},
			{Value: "rounding", Label: "Rounding"},
			{Value: "payment_term", Label: "Payment Term"},
			{Value: "line_section", Label: "Section"},
			{Value: "line_note", Label: "Note"},
			{Value: "epd", Label: "Early Payment Discount"},
		}, orm.FieldOpts{String: "Display Type", Default: "product"}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
	)

	// -- Reconciliation --
	m.AddFields(
		orm.Boolean("reconciled", orm.FieldOpts{String: "Reconciled"}),
		orm.Many2one("full_reconcile_id", "account.full.reconcile", orm.FieldOpts{String: "Matching"}),
	)
}

// initAccountPayment registers account.payment.
// Mirrors: odoo/addons/account/models/account_payment.py
func initAccountPayment() {
	m := orm.NewModel("account.payment", orm.ModelOpts{
		Description: "Payments",
		Order:       "date desc, name desc",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Name", Readonly: true}),
		orm.Many2one("move_id", "account.move", orm.FieldOpts{
			String: "Journal Entry", Required: true, OnDelete: orm.OnDeleteCascade,
		}),
		orm.Selection("payment_type", []orm.SelectionItem{
			{Value: "outbound", Label: "Send"},
			{Value: "inbound", Label: "Receive"},
		}, orm.FieldOpts{String: "Payment Type", Required: true}),
		orm.Selection("partner_type", []orm.SelectionItem{
			{Value: "customer", Label: "Customer"},
			{Value: "supplier", Label: "Vendor"},
		}, orm.FieldOpts{String: "Partner Type"}),
		orm.Selection("state", []orm.SelectionItem{
			{Value: "draft", Label: "Draft"},
			{Value: "in_process", Label: "In Process"},
			{Value: "paid", Label: "Paid"},
			{Value: "canceled", Label: "Cancelled"},
			{Value: "rejected", Label: "Rejected"},
		}, orm.FieldOpts{String: "Status", Default: "draft"}),
		orm.Date("date", orm.FieldOpts{String: "Date", Required: true}),
		orm.Monetary("amount", orm.FieldOpts{String: "Amount", Required: true, CurrencyField: "currency_id"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency", Required: true}),
		orm.Many2one("journal_id", "account.journal", orm.FieldOpts{String: "Journal", Required: true}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{String: "Customer/Vendor"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company", Required: true}),
		orm.Many2one("partner_bank_id", "res.partner.bank", orm.FieldOpts{String: "Recipient Bank Account"}),
		orm.Many2one("destination_account_id", "account.account", orm.FieldOpts{String: "Destination Account"}),
		orm.Boolean("is_reconciled", orm.FieldOpts{String: "Is Reconciled"}),
		orm.Boolean("is_matched", orm.FieldOpts{String: "Is Matched With a Bank Statement"}),
		orm.Char("payment_reference", orm.FieldOpts{String: "Payment Reference"}),
		orm.Char("payment_method_code", orm.FieldOpts{String: "Payment Method Code"}),
	)

	// action_post: confirm and post the payment.
	// Mirrors: odoo/addons/account/models/account_payment.py action_post()
	m.RegisterMethod("action_post", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, id := range rs.IDs() {
			if _, err := env.Tx().Exec(env.Ctx(),
				`UPDATE account_payment SET state = 'paid' WHERE id = $1 AND state = 'draft'`, id); err != nil {
				return nil, err
			}
		}
		return true, nil
	})

	// action_cancel: cancel the payment.
	m.RegisterMethod("action_cancel", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		for _, id := range rs.IDs() {
			if _, err := env.Tx().Exec(env.Ctx(),
				`UPDATE account_payment SET state = 'canceled' WHERE id = $1`, id); err != nil {
				return nil, err
			}
		}
		return true, nil
	})
}

// initAccountPaymentRegister registers the payment register wizard.
// Mirrors: odoo/addons/account/wizard/account_payment_register.py
// This is a TransientModel wizard opened via "Register Payment" button on invoices.
func initAccountPaymentRegister() {
	m := orm.NewModel("account.payment.register", orm.ModelOpts{
		Description: "Register Payment",
		Type:        orm.ModelTransient,
	})

	m.AddFields(
		orm.Date("payment_date", orm.FieldOpts{String: "Payment Date", Required: true}),
		orm.Monetary("amount", orm.FieldOpts{String: "Amount", CurrencyField: "currency_id"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency", Required: true}),
		orm.Many2one("journal_id", "account.journal", orm.FieldOpts{String: "Journal", Required: true}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{String: "Customer/Vendor"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Selection("payment_type", []orm.SelectionItem{
			{Value: "outbound", Label: "Send"},
			{Value: "inbound", Label: "Receive"},
		}, orm.FieldOpts{String: "Payment Type", Default: "inbound"}),
		orm.Selection("partner_type", []orm.SelectionItem{
			{Value: "customer", Label: "Customer"},
			{Value: "supplier", Label: "Vendor"},
		}, orm.FieldOpts{String: "Partner Type", Default: "customer"}),
		orm.Char("communication", orm.FieldOpts{String: "Memo"}),
		// Context-only: which invoice(s) are being paid
		orm.Many2many("line_ids", "account.move.line", orm.FieldOpts{
			String:   "Journal items",
			Relation: "payment_register_move_line_rel",
			Column1:  "wizard_id",
			Column2:  "line_id",
		}),
	)

	// action_create_payments: create account.payment from the wizard and mark invoice as paid.
	// Mirrors: odoo/addons/account/wizard/account_payment_register.py action_create_payments()
	m.RegisterMethod("action_create_payments", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
		env := rs.Env()
		wizardData, err := rs.Read([]string{
			"payment_date", "amount", "currency_id", "journal_id",
			"partner_id", "company_id", "payment_type", "partner_type", "communication",
		})
		if err != nil || len(wizardData) == 0 {
			return nil, fmt.Errorf("account: cannot read payment register wizard")
		}
		wiz := wizardData[0]

		paymentRS := env.Model("account.payment")
		paymentVals := orm.Values{
			"payment_type":      wiz["payment_type"],
			"partner_type":      wiz["partner_type"],
			"amount":            wiz["amount"],
			"date":              wiz["payment_date"],
			"currency_id":       wiz["currency_id"],
			"journal_id":        wiz["journal_id"],
			"partner_id":        wiz["partner_id"],
			"company_id":        wiz["company_id"],
			"payment_reference": wiz["communication"],
			"state":             "draft",
		}

		payment, err := paymentRS.Create(paymentVals)
		if err != nil {
			return nil, fmt.Errorf("account: create payment: %w", err)
		}

		// Auto-post the payment
		paymentModel := orm.Registry.Get("account.payment")
		if paymentModel != nil {
			if postMethod, ok := paymentModel.Methods["action_post"]; ok {
				if _, err := postMethod(payment); err != nil {
					return nil, fmt.Errorf("account: post payment: %w", err)
				}
			}
		}

		// Mark related invoices as paid (simplified: update payment_state on active invoices in context)
		// In Python Odoo this happens through reconciliation; we simplify for 70% target.
		if ctx := env.Context(); ctx != nil {
			if activeIDs, ok := ctx["active_ids"].([]interface{}); ok {
				for _, rawID := range activeIDs {
					if moveID, ok := toInt64Arg(rawID); ok && moveID > 0 {
						env.Tx().Exec(env.Ctx(),
							`UPDATE account_move SET payment_state = 'paid' WHERE id = $1 AND state = 'posted'`, moveID)
					}
				}
			}
		}

		// Return action to close wizard (standard Odoo pattern)
		return map[string]interface{}{
			"type": "ir.actions.act_window_close",
		}, nil
	})

	// DefaultGet: pre-fill wizard from active invoice context.
	// Mirrors: odoo/addons/account/wizard/account_payment_register.py default_get()
	m.DefaultGet = func(env *orm.Environment, fields []string) orm.Values {
		vals := orm.Values{
			"payment_date": time.Now().Format("2006-01-02"),
		}

		ctx := env.Context()
		if ctx == nil {
			return vals
		}

		// Get active invoice IDs from context
		var moveIDs []int64
		if ids, ok := ctx["active_ids"].([]interface{}); ok {
			for _, rawID := range ids {
				if id, ok := toInt64Arg(rawID); ok && id > 0 {
					moveIDs = append(moveIDs, id)
				}
			}
		}
		if len(moveIDs) == 0 {
			return vals
		}

		// Read first invoice to pre-fill defaults
		moveRS := env.Model("account.move").Browse(moveIDs[0])
		moveData, err := moveRS.Read([]string{
			"partner_id", "company_id", "currency_id", "amount_residual", "move_type",
		})
		if err != nil || len(moveData) == 0 {
			return vals
		}
		mv := moveData[0]

		if pid, ok := toInt64Arg(mv["partner_id"]); ok && pid > 0 {
			vals["partner_id"] = pid
		}
		if cid, ok := toInt64Arg(mv["company_id"]); ok && cid > 0 {
			vals["company_id"] = cid
		}
		if curID, ok := toInt64Arg(mv["currency_id"]); ok && curID > 0 {
			vals["currency_id"] = curID
		}
		if amt, ok := mv["amount_residual"].(float64); ok {
			vals["amount"] = amt
		}

		// Determine payment type from move type
		moveType, _ := mv["move_type"].(string)
		switch moveType {
		case "out_invoice", "out_receipt":
			vals["payment_type"] = "inbound"
			vals["partner_type"] = "customer"
		case "in_invoice", "in_receipt":
			vals["payment_type"] = "outbound"
			vals["partner_type"] = "supplier"
		}

		// Default bank journal
		var journalID int64
		companyID := env.CompanyID()
		env.Tx().QueryRow(env.Ctx(),
			`SELECT id FROM account_journal
			 WHERE type = 'bank' AND active = true AND company_id = $1
			 ORDER BY sequence, id LIMIT 1`, companyID).Scan(&journalID)
		if journalID > 0 {
			vals["journal_id"] = journalID
		}

		return vals
	}
}

// initAccountPaymentTerm registers payment terms.
// Mirrors: odoo/addons/account/models/account_payment_term.py
func initAccountPaymentTerm() {
	m := orm.NewModel("account.payment.term", orm.ModelOpts{
		Description: "Payment Terms",
		Order:       "sequence, id",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Payment Terms", Required: true, Translate: true}),
		orm.Boolean("active", orm.FieldOpts{String: "Active", Default: true}),
		orm.Text("note", orm.FieldOpts{String: "Description on the Invoice", Translate: true}),
		orm.One2many("line_ids", "account.payment.term.line", "payment_id", orm.FieldOpts{String: "Terms"}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Selection("early_discount", []orm.SelectionItem{
			{Value: "none", Label: "None"},
			{Value: "mixed", Label: "On early payment"},
		}, orm.FieldOpts{String: "Early Discount", Default: "none"}),
		orm.Float("discount_percentage", orm.FieldOpts{String: "Discount %"}),
		orm.Integer("discount_days", orm.FieldOpts{String: "Discount Days"}),
	)

	// Payment term lines — each line defines a portion
	orm.NewModel("account.payment.term.line", orm.ModelOpts{
		Description: "Payment Terms Line",
		Order:       "sequence, id",
	}).AddFields(
		orm.Many2one("payment_id", "account.payment.term", orm.FieldOpts{
			String: "Payment Terms", Required: true, OnDelete: orm.OnDeleteCascade,
		}),
		orm.Selection("value", []orm.SelectionItem{
			{Value: "balance", Label: "Balance"},
			{Value: "percent", Label: "Percent"},
			{Value: "fixed", Label: "Fixed Amount"},
		}, orm.FieldOpts{String: "Type", Required: true, Default: "balance"}),
		orm.Float("value_amount", orm.FieldOpts{String: "Value"}),
		orm.Integer("nb_days", orm.FieldOpts{String: "Days", Required: true, Default: 0}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence", Default: 10}),
	)
}

// initAccountReconcile registers reconciliation models.
// Mirrors: odoo/addons/account/models/account_reconcile_model.py
func initAccountReconcile() {
	// Full reconcile — groups partial reconciles
	orm.NewModel("account.full.reconcile", orm.ModelOpts{
		Description: "Full Reconcile",
	}).AddFields(
		orm.Char("name", orm.FieldOpts{String: "Name", Required: true}),
		orm.One2many("partial_reconcile_ids", "account.partial.reconcile", "full_reconcile_id", orm.FieldOpts{String: "Reconciliation Parts"}),
		orm.One2many("reconciled_line_ids", "account.move.line", "full_reconcile_id", orm.FieldOpts{String: "Matched Journal Items"}),
		orm.Many2one("exchange_move_id", "account.move", orm.FieldOpts{String: "Exchange Rate Entry"}),
	)

	// Partial reconcile — matches debit ↔ credit lines
	orm.NewModel("account.partial.reconcile", orm.ModelOpts{
		Description: "Partial Reconcile",
	}).AddFields(
		orm.Many2one("debit_move_id", "account.move.line", orm.FieldOpts{String: "Debit line", Required: true, Index: true}),
		orm.Many2one("credit_move_id", "account.move.line", orm.FieldOpts{String: "Credit line", Required: true, Index: true}),
		orm.Many2one("full_reconcile_id", "account.full.reconcile", orm.FieldOpts{String: "Full Reconcile"}),
		orm.Monetary("amount", orm.FieldOpts{String: "Amount", Required: true}),
		orm.Monetary("debit_amount_currency", orm.FieldOpts{String: "Debit Amount Currency"}),
		orm.Monetary("credit_amount_currency", orm.FieldOpts{String: "Credit Amount Currency"}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
		orm.Many2one("debit_currency_id", "res.currency", orm.FieldOpts{String: "Debit Currency"}),
		orm.Many2one("credit_currency_id", "res.currency", orm.FieldOpts{String: "Credit Currency"}),
		orm.Many2one("exchange_move_id", "account.move", orm.FieldOpts{String: "Exchange Rate Entry"}),
	)
}

// initAccountBankStatement registers bank statement models.
// Mirrors: odoo/addons/account/models/account_bank_statement.py
func initAccountBankStatement() {
	m := orm.NewModel("account.bank.statement", orm.ModelOpts{
		Description: "Bank Statement",
		Order:       "date desc, name desc, id desc",
	})

	m.AddFields(
		orm.Char("name", orm.FieldOpts{String: "Reference"}),
		orm.Date("date", orm.FieldOpts{String: "Date", Required: true}),
		orm.Many2one("journal_id", "account.journal", orm.FieldOpts{String: "Journal", Required: true}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company", Required: true}),
		orm.Float("balance_start", orm.FieldOpts{String: "Starting Balance"}),
		orm.Float("balance_end_real", orm.FieldOpts{String: "Ending Balance"}),
		orm.Float("balance_end", orm.FieldOpts{String: "Computed Balance", Compute: "_compute_balance_end"}),
		orm.One2many("line_ids", "account.bank.statement.line", "statement_id", orm.FieldOpts{String: "Statement Lines"}),
	)

	// Bank statement line
	orm.NewModel("account.bank.statement.line", orm.ModelOpts{
		Description: "Bank Statement Line",
		Order:       "internal_index desc, sequence, id desc",
	}).AddFields(
		orm.Many2one("statement_id", "account.bank.statement", orm.FieldOpts{String: "Statement"}),
		orm.Many2one("move_id", "account.move", orm.FieldOpts{String: "Journal Entry", Required: true}),
		orm.Many2one("journal_id", "account.journal", orm.FieldOpts{String: "Journal", Required: true}),
		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company", Required: true}),
		orm.Many2one("partner_id", "res.partner", orm.FieldOpts{String: "Partner"}),
		orm.Char("payment_ref", orm.FieldOpts{String: "Label"}),
		orm.Date("date", orm.FieldOpts{String: "Date", Required: true}),
		orm.Monetary("amount", orm.FieldOpts{String: "Amount", Required: true, CurrencyField: "currency_id"}),
		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
		orm.Char("transaction_type", orm.FieldOpts{String: "Transaction Type"}),
		orm.Char("account_number", orm.FieldOpts{String: "Bank Account Number"}),
		orm.Char("partner_name", orm.FieldOpts{String: "Partner Name"}),
		orm.Char("narration", orm.FieldOpts{String: "Notes"}),
		orm.Integer("sequence", orm.FieldOpts{String: "Sequence"}),
		orm.Char("internal_index", orm.FieldOpts{String: "Internal Index"}),
		orm.Boolean("is_reconciled", orm.FieldOpts{String: "Is Reconciled"}),
	)
}

// -- Helper functions for argument parsing in business methods --

// toInt64Arg converts various numeric types (float64, int64, int, int32) to int64.
// Returns (value, true) on success, (0, false) if not convertible.
func toInt64Arg(v interface{}) (int64, bool) {
	switch n := v.(type) {
	case int64:
		return n, true
	case float64:
		return int64(n), true
	case int:
		return int64(n), true
	case int32:
		return int64(n), true
	}
	return 0, false
}

// floatArg extracts a float64 from an interface{}, returning defaultVal if not possible.
func floatArg(v interface{}, defaultVal float64) float64 {
	switch n := v.(type) {
	case float64:
		return n
	case int64:
		return float64(n)
	case int:
		return float64(n)
	case int32:
		return float64(n)
	}
	return defaultVal
}