# -*- coding: utf-8 -*-
# © 2016 Akretion (http://www.akretion.com)
# Sébastien BEAU <sebastien.beau@akretion.com>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from openerp import api, models
from openerp.exceptions import Warning as UserError
from openerp.tools.translate import _


def __parse_field(parser_field):
    field_name = parser_field
    subparser = None
    if isinstance(parser_field, tuple):
        field_name, subparser = parser_field
    json_key = field_name
    if ':' in field_name:
        field_name, json_key = field_name.split(':')
    return field_name, json_key, subparser


@api.multi
def jsonify(self, parser):
    """ Convert the record according to the parser given
    Example of parser:
        parser = [
            'name',
            'number',
            'create_date',
            ('partner_id', ['id', 'display_name', 'ref'])
            ('line_id', ['id', ('product_id', ['name']), 'price_unit'])
        ]

    In order to be consitent with the odoo api the jsonify method always
    return a list of object even if there is only one element in input

    By default the key into the json is the name of the field extracted
    from the model. If you need to specify an alternate name to use as key, you
    can define your mapping as follow into the parser definition:

    parser = [
         'field_name:json_key'
    ]

    """
    result = []
    empty_value = {
        'char': '',
        'int': 0,
        'float': 0,
        }

    for rec in self:
        res = {}
        for field in parser:
            field_name, json_key, subparser = __parse_field(field)
            field_type = rec._fields[field_name].type
            if subparser:
                if field_type in ('one2many', 'many2many'):
                    res[json_key] = rec[field_name].jsonify(subparser)
                elif field_type in ('many2one', 'reference'):
                    if rec[field_name]:
                        res[json_key] = rec[field_name].jsonify(subparser)[0]
                    else:
                        res[json_key] = None
                else:
                    raise UserError(_('Wrong parser configuration'))
            else:
                res[json_key] = rec[field_name]
                if not res[json_key] and field_type in empty_value:
                    res[json_key] = empty_value[field_type]
        result.append(res)
    return result


models.Model.jsonify = jsonify