# Copyright 2019 Tecnativa - Ernesto Tejeda
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
from odoo import fields, models, api, _
from odoo.exceptions import UserError


class SaleOrderLine(models.Model):
    _inherit = 'sale.order.line'

    @api.multi
    def expand_pack_line(self, write=False):
        self.ensure_one()
        # if we are using update_pricelist or checking out on ecommerce we
        # only want to update prices
        do_not_expand = self._context.get('update_prices') or \
            self._context.get('update_pricelist', False)
        if (
                self.state == 'draft' and
                self.product_id.pack_ok and
                self.pack_type == 'detailed'):
            for subline in self.product_id.get_pack_lines():
                vals = subline.get_sale_order_line_vals(self, self.order_id)
                vals['sequence'] = self.sequence
                vals['active'] = False
                if write:
                    existing_subline = self.search([
                        ('product_id', '=', subline.product_id.id),
                        ('pack_parent_line_id', '=', self.id),
                    ], limit=1)
                    # if subline already exists we update, if not we create
                    if existing_subline:
                        if do_not_expand:
                            vals.pop('product_uom_qty')
                        existing_subline.write(vals)
                    elif not do_not_expand:
                        self.create(vals)
                else:
                    self.create(vals)

    @api.model
    def create(self, vals):
        record = super().create(vals)
        record.expand_pack_line()
        return record

    @api.multi
    def write(self, vals):
        super().write(vals)
        if 'product_id' in vals or 'product_uom_qty' in vals:
            for record in self:
                record.expand_pack_line(write=True)

    def _get_real_price_currency(
            self, product, rule_id, qty, uom, pricelist_id):
        new_list_price, currency_id = super()._get_real_price_currency(
            product, rule_id, qty, uom, pricelist_id)
        pack_types = {'totalized', 'ignored'}
        parent_line = self.pack_parent_line_id
        if parent_line and parent_line.pack_type == 'details' \
                and parent_line.pack_component_price in pack_types:
            new_list_price = 0.0
        return new_list_price, currency_id

    @api.onchange('product_id', 'product_uom_qty', 'product_uom', 'price_unit',
                  'discount', 'name', 'tax_id')
    def check_pack_line_modify(self):
        """ Do not let to edit a sale order line if this one belongs to pack
        """
        if self._origin.pack_parent_line_id and \
           not self._origin.pack_parent_line_id.product_id.pack_modifiable:
            raise UserError(_(
                'You can not change this line because is part of a pack'
                ' included in this order'))

    @api.multi
    def _get_display_price(self, product):
        # We do this to clean the price if the parent of the
        # component it's that type
        pack_types = {'totalized', 'ignored'}
        parent_line = self.pack_parent_line_id
        if parent_line.pack_type == 'detailed' \
                and parent_line.pack_component_price in pack_types:
            return 0.0
        return super()._get_display_price(product)