from trytond.pool import Pool, PoolMeta
from trytond.model import (
    ModelSQL, ModelView, Workflow, fields)
from trytond.modules.company.model import set_employee
from trytond.exceptions import UserError


class Subscription(metaclass=PoolMeta):
    __name__ = 'sale.subscription'

    equipments = fields.Many2Many('sale.subscription-optical_equipment.equipment', 'subscription',
                                  'equipment', "Equipments")

    @classmethod
    @ModelView.button
    @Workflow.transition('running')
    @set_employee('run_by')
    def run(cls, subscriptions):
        pool = Pool()
        Line = pool.get('sale.subscription.line')
        lines = []

        pool = Pool()
        Equipments = pool.get('optical_equipment.equipment')

        for subscription in subscriptions:
            if not subscription.next_invoice_date:
                subscription.next_invoice_date = (
                    subscription.compute_next_invoice_date())
            for line in subscription.lines:
                if (line.next_consumption_date is None
                        and not line.consumed_until):
                    line.next_consumption_date = (
                        line.compute_next_consumption_date())
            lines.extend(subscription.lines)
            for equipment in subscription.equipments:
                equipment.state = "contrated"
                equipment.save()
        Line.save(lines)
        cls.save(subscriptions)
        
class SubscriptionEquipment(ModelSQL):
    'Optical Equipment - Subscription'
    __name__ = 'sale.subscription-optical_equipment.equipment'
    
    subscription = fields.Many2One('sale.subscription', 'Subscription', select=True)
    equipment = fields.Many2One('optical_equipment.equipment', 'Equipment', select=True)
    
class Line(metaclass=PoolMeta):
    __name__ = 'sale.subscriptioin.line'