# Copyright 2017 ACSONE SA/NV
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

from odoo.exceptions import ValidationError
from odoo import api, fields, models, _


class IrExportsLine(models.Model):
    _inherit = 'ir.exports.line'

    alias = fields.Char(
        'Alias',
        help='The complete path to the field where you can specify an '
             'alias on the a step as field:alias'
    )

    @api.constrains('alias', 'name')
    def _check_alias(self):
        for rec in self:
            if not rec.alias:
                continue
            names = rec.name.split('/')
            names_with_alias = rec.alias.split('/')
            if len(names) != len(names_with_alias):
                raise ValidationError(
                    _("Name and Alias must have the same hierarchy depth"))
            for name, name_with_alias in zip(names, names_with_alias):
                field_name = name_with_alias.split(':')[0]
                if name != field_name:
                    raise ValidationError(
                        _("The alias must reference the same field as in "
                          "name '%s' not in '%s'") % (name, name_with_alias)
                    )