# This file is part of Tryton.  The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
from sql import Null
from sql.conditionals import Case

from trytond.model import (ModelView, ModelSQL,
            ModelSingleton, MatchMixin, fields)
from trytond.pool import Pool
from trytond.transaction import Transaction
from trytond.pyson import Eval

__all__ = ['Configuration', 'ConfigurationTaxRounding']

tax_roundings = [
    ('document', 'Per Document'),
    ('line', 'Per Line'),
    ]


class Configuration(ModelSingleton, ModelSQL, ModelView):
    'Account Configuration'
    __name__ = 'account.configuration'
    default_account_receivable = fields.Function(fields.Many2One(
        'account.account', 'Default Account Receivable',
        domain=[
                ('kind', '=', 'receivable'),
                ('company', '=', Eval('context', {}).get('company', -1)),
                ]),
        'get_account', setter='set_account')
    default_account_payable = fields.Function(fields.Many2One(
        'account.account', 'Default Account Payable',
        domain=[
                ('kind', '=', 'payable'),
                ('company', '=', Eval('context', {}).get('company', -1)),
                ]),
        'get_account', setter='set_account')
    tax_rounding = fields.Function(fields.Selection(tax_roundings,
            'Tax Rounding'), 'on_change_with_tax_rounding')
    tax_roundings = fields.One2Many('account.configuration.tax_rounding',
        'configuration', 'Tax Roundings')

    @classmethod
    def default_tax_rounding(cls):
        return 'document'

    @classmethod
    def _get_account_field(cls, name):
        pool = Pool()
        ModelField = pool.get('ir.model.field')
        if name in ['default_account_receivable', 'default_account_payable']:
            field, = ModelField.search([
                ('model.model', '=', 'party.party'),
                ('name', '=', name[8:]),
                ], limit=1)
            return field

    def get_account(self, name):
        pool = Pool()
        Property = pool.get('ir.property')
        company_id = Transaction().context.get('company')
        account_field = self._get_account_field(name)
        properties = Property.search([
            ('field', '=', account_field.id),
            ('res', '=', None),
            ('company', '=', company_id),
            ], limit=1)
        if properties:
            prop, = properties
            return prop.value.id

    @classmethod
    def set_account(cls, configurations, name, value):
        pool = Pool()
        Property = pool.get('ir.property')
        company_id = Transaction().context.get('company')
        account_field = cls._get_account_field(name)
        properties = Property.search([
            ('field', '=', account_field.id),
            ('res', '=', None),
            ('company', '=', company_id),
            ])
        Property.delete(properties)
        if value:
            Property.create([{
                        'field': account_field.id,
                        'value': 'account.account,%s' % value,
                        'company': company_id,
                        }])

    @fields.depends('tax_roundings')
    def on_change_with_tax_rounding(self, name=None, pattern=None):
        context = Transaction().context
        if pattern is None:
            pattern = {}
        pattern = pattern.copy()
        pattern['company'] = context.get('company')

        for line in self.tax_roundings:
            if line.match(pattern):
                return line.method
        return self.default_tax_rounding()


class ConfigurationTaxRounding(ModelSQL, ModelView, MatchMixin):
    'Account Configuration Tax Rounding'
    __name__ = 'account.configuration.tax_rounding'
    configuration = fields.Many2One('account.configuration', 'Configuration',
        required=True, ondelete='CASCADE')
    sequence = fields.Integer('Sequence')
    company = fields.Many2One('company.company', 'Company')
    method = fields.Selection(tax_roundings, 'Method', required=True)

    @classmethod
    def __setup__(cls):
        super(ConfigurationTaxRounding, cls).__setup__()
        cls._order.insert(0, ('sequence', 'ASC'))

    @classmethod
    def order_sequence(cls, tables):
        table, _ = tables[None]
        return [Case((table.sequence == Null, 0), else_=1), table.sequence]

    @classmethod
    def default_method(cls):
        return 'document'