#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.operators import Concat

from trytond.model import Workflow, ModelView, fields
from trytond.transaction import Transaction
from trytond.pool import Pool, PoolMeta
from trytond import backend

__all__ = ['ShipmentOut', 'ShipmentOutReturn', 'Move']
__metaclass__ = PoolMeta


class ShipmentOut:
    __name__ = 'stock.shipment.out'

    @classmethod
    def __setup__(cls):
        super(ShipmentOut, cls).__setup__()
        cls._error_messages.update({
                'reset_move': 'You cannot reset to draft a move generated '
                    'by a sale.',
            })

    @classmethod
    def write(cls, shipments, vals):
        pool = Pool()
        Sale = pool.get('sale.sale')
        SaleLine = pool.get('sale.line')

        super(ShipmentOut, cls).write(shipments, vals)

        if 'state' in vals and vals['state'] in ('done', 'cancel'):
            sales = []
            move_ids = []
            for shipment in shipments:
                move_ids.extend([x.id for x in shipment.outgoing_moves])

            with Transaction().set_user(0, set_context=True):
                sale_lines = SaleLine.search([
                        ('moves', 'in', move_ids),
                        ])
                if sale_lines:
                    sales = list(set(l.sale for l in sale_lines))
                    Sale.process(sales)

    @classmethod
    @ModelView.button
    @Workflow.transition('draft')
    def draft(cls, shipments):
        SaleLine = Pool().get('sale.line')
        for shipment in shipments:
            for move in shipment.outgoing_moves:
                if (move.state == 'cancel'
                        and isinstance(move.origin, SaleLine)):
                    cls.raise_user_error('reset_move')

        return super(ShipmentOut, cls).draft(shipments)


class ShipmentOutReturn:
    __name__ = 'stock.shipment.out.return'

    @classmethod
    def __setup__(cls):
        super(ShipmentOutReturn, cls).__setup__()
        cls._error_messages.update({
                'reset_move': 'You cannot reset to draft a move generated '
                    'by a sale.',
            })

    @classmethod
    def write(cls, shipments, vals):
        pool = Pool()
        Sale = pool.get('sale.sale')
        SaleLine = pool.get('sale.line')

        super(ShipmentOutReturn, cls).write(shipments, vals)

        if 'state' in vals and vals['state'] == 'received':
            sales = []
            move_ids = []
            for shipment in shipments:
                move_ids.extend([x.id for x in shipment.incoming_moves])

            with Transaction().set_user(0, set_context=True):
                sale_lines = SaleLine.search([
                        ('moves', 'in', move_ids),
                        ])
                if sale_lines:
                    for sale_line in sale_lines:
                        if sale_line.sale not in sales:
                            sales.append(sale_line.sale)

                    sales = Sale.browse([s.id for s in sales])
                    Sale.process(sales)

    @classmethod
    @ModelView.button
    @Workflow.transition('draft')
    def draft(cls, shipments):
        SaleLine = Pool().get('sale.line')
        for shipment in shipments:
            for move in shipment.incoming_moves:
                if (move.state == 'cancel'
                        and isinstance(move.origin, SaleLine)):
                    cls.raise_user_error('reset_move')

        return super(ShipmentOutReturn, cls).draft(shipments)


class Move:
    __name__ = 'stock.move'
    sale = fields.Function(fields.Many2One('sale.sale', 'Sale', select=True),
        'get_sale', searcher='search_sale')
    sale_exception_state = fields.Function(fields.Selection([
        ('', ''),
        ('ignored', 'Ignored'),
        ('recreated', 'Recreated'),
        ], 'Exception State'), 'get_sale_exception_state')

    @classmethod
    def __register__(cls, module_name):
        TableHandler = backend.get('TableHandler')
        cursor = Transaction().cursor
        sql_table = cls.__table__()

        super(Move, cls).__register__(module_name)

        table = TableHandler(cursor, cls, module_name)

        # Migration from 2.6: remove sale_line
        if table.column_exist('sale_line'):
            cursor.execute(*sql_table.update(
                    columns=[sql_table.origin],
                    values=[Concat('sale.line,', sql_table.sale_line)],
                    where=sql_table.sale_line != None))
            table.drop_column('sale_line')

    @classmethod
    def _get_origin(cls):
        models = super(Move, cls)._get_origin()
        models.append('sale.line')
        return models

    def get_sale(self, name):
        SaleLine = Pool().get('sale.line')
        if isinstance(self.origin, SaleLine):
            return self.origin.sale.id

    @classmethod
    def search_sale(cls, name, clause):
        return [('origin.' + name,) + tuple(clause[1:]) + ('sale.line',)]

    def get_sale_exception_state(self, name):
        SaleLine = Pool().get('sale.line')
        if not isinstance(self.origin, SaleLine):
            return ''
        if self in self.origin.moves_recreated:
            return 'recreated'
        if self in self.origin.moves_ignored:
            return 'ignored'
        return ''

    @property
    def origin_name(self):
        pool = Pool()
        SaleLine = pool.get('sale.line')
        name = super(Move, self).origin_name
        if isinstance(self.origin, SaleLine):
            name = self.origin.sale.rec_name
        return name

    @classmethod
    @ModelView.button
    @Workflow.transition('cancel')
    def cancel(cls, moves):
        pool = Pool()
        Sale = pool.get('sale.sale')
        SaleLine = pool.get('sale.line')

        super(Move, cls).cancel(moves)

        with Transaction().set_user(0, set_context=True):
            sale_lines = SaleLine.search([
                    ('moves', 'in', [m.id for m in moves]),
                    ])
            if sale_lines:
                sale_ids = list(set(l.sale.id for l in sale_lines))
                sales = Sale.browse(sale_ids)
                Sale.process(sales)

    @classmethod
    def delete(cls, moves):
        pool = Pool()
        Sale = pool.get('sale.sale')
        SaleLine = pool.get('sale.line')

        with Transaction().set_user(0, set_context=True):
            sale_lines = SaleLine.search([
                    ('moves', 'in', [m.id for m in moves]),
                    ])

        super(Move, cls).delete(moves)

        if sale_lines:
            sales = list(set(l.sale for l in sale_lines))
            with Transaction().set_user(0, set_context=True):
                Sale.process(sales)
