# -*- encoding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.

from odoo import api, fields, models


class PurchaseOrder(models.Model):
    _inherit = 'purchase.order'

    requisition_id = fields.Many2one('purchase.requisition', string='Purchase Agreement', copy=False)
    is_quantity_copy = fields.Selection(related='requisition_id.is_quantity_copy', readonly=False)

    @api.onchange('requisition_id')
    def _onchange_requisition_id(self):
        if not self.requisition_id:
            return

        self = self.with_company(self.company_id)
        requisition = self.requisition_id
        if self.partner_id:
            partner = self.partner_id
        else:
            partner = requisition.vendor_id
        payment_term = partner.property_supplier_payment_term_id

        FiscalPosition = self.env['account.fiscal.position']
        fpos = FiscalPosition.with_company(self.company_id).get_fiscal_position(partner.id)

        self.partner_id = partner.id
        self.fiscal_position_id = fpos.id
        self.payment_term_id = payment_term.id,
        self.company_id = requisition.company_id.id
        self.currency_id = requisition.currency_id.id
        if not self.origin or requisition.name not in self.origin.split(', '):
            if self.origin:
                if requisition.name:
                    self.origin = self.origin + ', ' + requisition.name
            else:
                self.origin = requisition.name
        self.notes = requisition.description
        self.date_order = fields.Datetime.now()

        if requisition.type_id.line_copy != 'copy':
            return

        # Create PO lines if necessary
        order_lines = []
        for line in requisition.line_ids:
            # Compute name
            product_lang = line.product_id.with_context(
                lang=partner.lang or self.env.user.lang,
                partner_id=partner.id
            )
            name = product_lang.display_name
            if product_lang.description_purchase:
                name += '\n' + product_lang.description_purchase

            # Compute taxes
            taxes_ids = fpos.map_tax(line.product_id.supplier_taxes_id.filtered(lambda tax: tax.company_id == requisition.company_id)).ids

            # Compute quantity and price_unit
            if line.product_uom_id != line.product_id.uom_po_id:
                product_qty = line.product_uom_id._compute_quantity(line.product_qty, line.product_id.uom_po_id)
                price_unit = line.product_uom_id._compute_price(line.price_unit, line.product_id.uom_po_id)
            else:
                product_qty = line.product_qty
                price_unit = line.price_unit

            if requisition.type_id.quantity_copy != 'copy':
                product_qty = 0

            # Create PO line
            order_line_values = line._prepare_purchase_order_line(
                name=name, product_qty=product_qty, price_unit=price_unit,
                taxes_ids=taxes_ids)
            order_lines.append((0, 0, order_line_values))
        self.order_line = order_lines

    def button_confirm(self):
        res = super(PurchaseOrder, self).button_confirm()
        for po in self:
            if not po.requisition_id:
                continue
            if po.requisition_id.type_id.exclusive == 'exclusive':
                others_po = po.requisition_id.mapped('purchase_ids').filtered(lambda r: r.id != po.id)
                others_po.button_cancel()
                if po.state not in ['draft', 'sent', 'to approve']:
                    po.requisition_id.action_done()
        return res

    @api.model
    def create(self, vals):
        purchase = super(PurchaseOrder, self).create(vals)
        if purchase.requisition_id:
            purchase.message_post_with_view('mail.message_origin_link',
                    values={'self': purchase, 'origin': purchase.requisition_id},
                    subtype_id=self.env['ir.model.data'].xmlid_to_res_id('mail.mt_note'))
        return purchase

    def write(self, vals):
        result = super(PurchaseOrder, self).write(vals)
        if vals.get('requisition_id'):
            self.message_post_with_view('mail.message_origin_link',
                    values={'self': self, 'origin': self.requisition_id, 'edit': True},
                    subtype_id=self.env['ir.model.data'].xmlid_to_res_id('mail.mt_note'))
        return result


class PurchaseOrderLine(models.Model):
    _inherit = 'purchase.order.line'

    @api.onchange('product_qty', 'product_uom')
    def _onchange_quantity(self):
        res = super(PurchaseOrderLine, self)._onchange_quantity()
        if self.order_id.requisition_id:
            for line in self.order_id.requisition_id.line_ids.filtered(lambda l: l.product_id == self.product_id):
                if line.product_uom_id != self.product_uom:
                    self.price_unit = line.product_uom_id._compute_price(
                        line.price_unit, self.product_uom)
                else:
                    self.price_unit = line.price_unit
                break
        return res