class CreatePurchaseRequestQuotation(Wizard):
    'Create Purchase Request Quotation'
    __name__ = 'purchase.request.quotation.create'

    start_state = 'start'
    start = StateTransition()
    ask_suppliers = StateView(
        'purchase.request.quotation.create.ask_suppliers',
        'purchase_requeste_quotation_create_ask_suppliers', [
            Button('Cancel', 'end', 'tryton-cancel'),
            Button('Process', 'create_quotations', 'tryton-ok', default=True),
            ])
    create_quotations = StateTransition()

    @classmethod
    def __setup__(cls):
        super(CreatePurchaseRequestQuotation, cls).__setup__()
        cls._error_messages.update({
                'previous_quotation': ('A quotation was already made with '
                    'this request: "%(request)s".'),
                'no_request': ('No request selected or wrong state to '
                    'proceed'),
                })

    def transition_start(self):
        pool = Pool()
        Request = pool.get('purchase.request')
        suppliers = []
        requests = []

        request_ids = Transaction().context['active_ids']
        for request_id in request_ids:
            request = Request(request_id)
            if request.state in ('draft', 'quotation'):
                if request.state == 'quotation':
                    self.raise_user_warning(str(request),
                                'previous_quotation',
                                {'request': request.rec_name, })
                requests.append(request.id)
                if request.party:
                    suppliers.append(request.party.id)
        if requests:
            self.ask_suppliers.requests = requests
            self.ask_suppliers.suppliers = suppliers
            return 'ask_suppliers'
        self.raise_user_error('no_request')
        return 'end'

    def default_ask_suppliers(self, fields):
        defaults = {}
        defaults['requests'] = [r.id for r in self.ask_suppliers.requests]
        defaults['suppliers'] = [s.id for s in self.ask_suppliers.suppliers]
        return defaults