# 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 decimal import Decimal

from trytond.model import fields
from trytond.modules.account_product.product import (
    account_used, template_property)
from trytond.pool import Pool, PoolMeta
from trytond.pyson import Eval
from trytond.transaction import Transaction

account_names = [
    'account_stock', 'account_stock_in', 'account_stock_out']


class Category(metaclass=PoolMeta):
    __name__ = 'product.category'
    account_stock = fields.MultiValue(fields.Many2One(
            'account.account', "Account Stock",
            domain=[
                ('closed', '!=', True),
                ('type.stock', '=', True),
                ('type.statement', '=', 'balance'),
                ('company', '=', Eval('context', {}).get('company', -1)),
                ],
            states={
                'invisible': (~Eval('context', {}).get('company')
                    | Eval('account_parent')
                    | ~Eval('accounting', False)),
                }))
    account_stock_in = fields.MultiValue(fields.Many2One(
            'account.account', "Account Stock IN",
            domain=[
                ('closed', '!=', True),
                ('type.stock', '=', True),
                ('company', '=', Eval('context', {}).get('company', -1)),
                ],
            states={
                'invisible': (~Eval('context', {}).get('company')
                    | Eval('account_parent')
                    | ~Eval('accounting', False)),
                }))
    account_stock_out = fields.MultiValue(fields.Many2One(
            'account.account', "Account Stock OUT",
            domain=[
                ('closed', '!=', True),
                ('type.stock', '=', True),
                ('company', '=', Eval('context', {}).get('company', -1)),
                ],
            states={
                'invisible': (~Eval('context', {}).get('company')
                    | Eval('account_parent')
                    | ~Eval('accounting', False)),
                }))

    @classmethod
    def __setup__(cls):
        pool = Pool()
        CategoryAccount = pool.get('product.category.account')
        super().__setup__()
        for account in [cls.account_stock_in, cls.account_stock_out]:
            account.domain = [
                account.domain,
                ('type.statement', 'in',
                    CategoryAccount.get_account_stock_type_statements()),
                ]

    @classmethod
    def multivalue_model(cls, field):
        pool = Pool()
        if field in account_names:
            return pool.get('product.category.account')
        return super().multivalue_model(field)

    @property
    @account_used('account_stock')
    def account_stock_used(self):
        pass

    @property
    @account_used('account_stock_in')
    def account_stock_in_used(self):
        pass

    @property
    @account_used('account_stock_out')
    def account_stock_out_used(self):
        pass

    @fields.depends(
        'accounting', 'account_stock', 'account_stock_in', 'account_stock_out')
    def on_change_accounting(self):
        super().on_change_accounting()
        if not self.accounting:
            self.account_stock = None
            self.account_stock_in = None
            self.account_stock_out = None


class CategoryAccount(metaclass=PoolMeta):
    __name__ = 'product.category.account'
    account_stock = fields.Many2One(
        'account.account', "Account Stock",
        domain=[
            ('closed', '!=', True),
            ('type.stock', '=', True),
            ('type.statement', '=', 'balance'),
            ('company', '=', Eval('company', -1)),
            ])
    account_stock_in = fields.Many2One(
        'account.account', "Account Stock IN",
        domain=[
            ('closed', '!=', True),
            ('type.stock', '=', True),
            ('company', '=', Eval('company', -1)),
            ])
    account_stock_out = fields.Many2One(
        'account.account', "Account Stock OUT",
        domain=[
            ('closed', '!=', True),
            ('type.stock', '=', True),
            ('company', '=', Eval('company', -1)),
            ])

    @classmethod
    def __setup__(cls):
        super().__setup__()
        for account in [cls.account_stock_in, cls.account_stock_out]:
            account.domain = [
                account.domain,
                ('type.statement', 'in',
                    cls.get_account_stock_type_statements()),
                ]

    @classmethod
    def get_account_stock_type_statements(cls):
        return ['income']


class Template(metaclass=PoolMeta):
    __name__ = 'product.template'

    @classmethod
    def __setup__(cls):
        super().__setup__()
        cls._modify_no_move.append(
            ('cost_price',
                'account_stock_continental.msg_product_change_cost_price'))

    @property
    @account_used('account_stock', 'account_category')
    def account_stock_used(self):
        pass

    @property
    @account_used('account_stock_in', 'account_category')
    def account_stock_in_used(self):
        pass

    @property
    @account_used('account_stock_out', 'account_category')
    def account_stock_out_used(self):
        pass


class Product(metaclass=PoolMeta):
    __name__ = 'product.product'
    account_stock_used = template_property('account_stock_used')
    account_stock_in_used = template_property('account_stock_in_used')
    account_stock_out_used = template_property('account_stock_out_used')

    @classmethod
    def update_cost_price(cls, costs):
        pool = Pool()
        Date = pool.get('ir.date')
        Stock = pool.get('stock.location')
        Company = pool.get('company.company')
        Move = pool.get('account.move')
        Period = pool.get('account.period')

        context = Transaction().context
        locations = Stock.search([('type', '=', 'storage')])
        company = Company(context['company'])
        with Transaction().set_context(company=company.id):
            stock_date_end = Date.today()
        period = Period.find(company, date=stock_date_end)
        if period.fiscalyear.account_stock_method:
            moves = []
            with Transaction().set_context(locations=[l.id for l in locations],
                    stock_date_end=stock_date_end):
                for cost, products in costs.items():
                    products = cls.browse(products)
                    for product in products:
                        difference = cost - product.cost_price
                        quantity = product.quantity
                        amount = company.currency.round(
                            Decimal(str(quantity)) * difference)
                        if amount:
                            moves.append(product._update_cost_price_move(
                                    amount, company, period, stock_date_end))
        Move.save(moves)
        Move.post(moves)
        super().update_cost_price(costs)

    def _update_cost_price_move(self, amount, company, period, date):
        pool = Pool()
        AccountConfiguration = pool.get('account.configuration')
        Move = pool.get('account.move')
        Line = pool.get('account.move.line')

        config = AccountConfiguration(1)
        if amount > 0:
            account = self.account_stock_in_used
        else:
            account = self.account_stock_out_used
        return Move(
            period=period,
            journal=config.stock_journal,
            date=date,
            origin=self,
            lines=[Line(
                    debit=amount if amount > 0 else 0,
                    credit=-amount if amount < 0 else 0,
                    account=self.account_stock_used,
                    ),
                Line(
                    debit=-amount if amount < 0 else 0,
                    credit=amount if amount > 0 else 0,
                    account=account,
                    ),
                ],
            )