from odoo import fields, models, api, _
from odoo.exceptions import AccessError, UserError, ValidationError
from datetime import datetime, timedelta
from pytz import timezone

class PurchasePricelist(models.Model):
    _name = 'purchase.pricelist'
    _rec_name = 'product_id'
    _inherit = ['mail.thread', 'mail.activity.mixin']

    name = fields.Char(string='Name', compute="_compute_name")
    product_id = fields.Many2one('product.product', string="Product", required=True)
    vendor_id = fields.Many2one('res.partner', string="Vendor", required=True)
    price = fields.Float(string='Price', required=True)

    _sql_constraints = [
        ('product_unique', 'unique (product_id)', 'This product already has a purchase pricelist!'),
    ]

    @api.depends('product_id', 'vendor_id')
    def _compute_name(self):
        self.name = self.vendor_id.name + ', ' + self.product_id.name