# 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.pool import Pool, PoolMeta
from trytond.model import fields
from trytond.modules.product import price_digits, round_price

from trytond.exceptions import UserError


BOM_CHANGES = ['bom', 'product', 'quantity', 'uom', 'warehouse', 'location',
               'company', 'inputs', 'outputs']

class Production(metaclass=PoolMeta):
    "Production"
    __name__ = 'production'


    @fields.depends(*BOM_CHANGES)
    def explode_bom(self):
        pool = Pool()
        Uom = pool.get('product.uom')
        if not (self.bom and self.product and self.uom):
            return

        factor = self.bom.compute_factor(self.product, self.quantity or 0,
            self.uom)

        inputs = []
        for input_ in self.bom.inputs:
            if input_.product.producible:
                for input_ in input_.product.template.boms.inputs:
                    quantity = input_.compute_quantity(factor)
                    move = self._explode_move_values(
                        self.picking_location, self.location, self.company,
                        input_, quantity)
                    if move:
                        inputs.append(move)
                        quantity = Uom.compute_qty(input_.uom, quantity,
                                                   input_.product.default_uom, round=False)
            else:
                quantity = input_.compute_quantity(factor)
                move = self._explode_move_values(
                    self.picking_location, self.location, self.company,
                    input_, quantity)
                if move:
                    inputs.append(move)
                    quantity = Uom.compute_qty(input_.uom, quantity,
                        input_.product.default_uom, round=False)
        self.inputs = inputs

        outputs = []
        for output in self.bom.outputs:
            quantity = output.compute_quantity(factor)
            move = self._explode_move_values(
                self.location, self.output_location, self.company, output,
                quantity)
            if move:
                move.unit_price = Decimal(0)
                outputs.append(move)
        self.outputs = outputs