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

from odoo import _, api, fields, models, Command
from odoo.exceptions import UserError


class PurchaseRequisitionCreateAlternative(models.TransientModel):
    _name = 'purchase.requisition.create.alternative'
    _description = 'Wizard to preset values for alternative PO'

    origin_po_id = fields.Many2one(
        'purchase.order', help="The original PO that this alternative PO is being created for."
    )
    partner_id = fields.Many2one(
        'res.partner', string='Vendor', required=True,
        help="Choose a vendor for alternative PO")
    creation_blocked = fields.Boolean(
        help="If the chosen vendor or if any of the products in the original PO have a blocking warning then we prevent creation of alternative PO. "
             "This is because normally these fields are cleared w/warning message within form view, but we cannot recreate that in this case.",
        compute="_compute_purchase_warn",
        groups="purchase.group_warning_purchase")
    purchase_warn_msg = fields.Text(
        'Warning Messages',
        compute="_compute_purchase_warn",
        groups="purchase.group_warning_purchase")
    copy_products = fields.Boolean(
        "Copy Products", default=True,
        help="If this is checked, the product quantities of the original PO will be copied")

    @api.depends('partner_id', 'copy_products')
    def _compute_purchase_warn(self):
        self.creation_blocked = False
        self.purchase_warn_msg = ''
        # follows partner warning logic from PurchaseOrder
        if not self.env.user.has_group('purchase.group_warning_purchase'):
            return
        partner = self.partner_id
        # If partner has no warning, check its company
        if partner and partner.purchase_warn == 'no-message':
            partner = partner.parent_id
        if partner and partner.purchase_warn != 'no-message':
            self.purchase_warn_msg = _("Warning for %(partner)s:\n%(warning_message)s\n", partner=partner.name, warning_message=partner.purchase_warn_msg)
            if partner.purchase_warn == 'block':
                self.creation_blocked = True
                self.purchase_warn_msg += _("This is a blocking warning!\n")
        if self.copy_products and self.origin_po_id.order_line:
            for line in self.origin_po_id.order_line:
                if line.product_id.purchase_line_warn != 'no-message':
                    self.purchase_warn_msg += _("Warning for %(product)s:\n%(warning_message)s\n", product=line.product_id.name, warning_message=line.product_id.purchase_line_warn_msg)
                    if line.product_id.purchase_line_warn == 'block':
                        self.creation_blocked = True
                        self.purchase_warn_msg += _("This is a blocking warning!\n")

    def action_create_alternative(self):
        if self.env.user.has_group('purchase.group_warning_purchase') and self.creation_blocked:
            raise UserError(
                _('The vendor you have selected or at least one of the products you are copying from the original '
                  'order has a blocking warning on it and cannot be selected to create an alternative.')
            )
        vals = self._get_alternative_values()
        alt_po = self.env['purchase.order'].with_context(origin_po_id=self.origin_po_id.id, default_requisition_id=False).create(vals)
        return {
            'type': 'ir.actions.act_window',
            'view_mode': 'form',
            'res_model': 'purchase.order',
            'res_id': alt_po.id,
            'context': {
                'active_id': alt_po.id,
            },
        }

    def _get_alternative_values(self):
        vals = {
            'date_order': self.origin_po_id.date_order,
            'partner_id': self.partner_id.id,
            'user_id': self.origin_po_id.user_id.id,
            'dest_address_id': self.origin_po_id.dest_address_id.id,
            'origin': self.origin_po_id.origin,
        }
        if self.copy_products and self.origin_po_id:
            vals['order_line'] = [Command.create(self._get_alternative_line_value(line)) for line in self.origin_po_id.order_line]
        return vals

    @api.model
    def _get_alternative_line_value(self, order_line):
        return {
            'product_id': order_line.product_id.id,
            'product_qty': order_line.product_qty,
            'product_uom': order_line.product_uom.id,
            'display_type': order_line.display_type,
            'name': order_line.name,
        }