"""Read-only billing prediction for a time registration that has not been saved."""
from .service import transaction, load_case_context, json_safe
from .integration import active_for_customer
from .classification import enrich_entity_context
from .engine import evaluate


def preview_case_billing(case_id, minutes=30, description='', time_type='support'):
    with transaction() as cursor:
        context = load_case_context(case_id, cursor)
        if context.get('deleted_at'):
            raise ValueError('Case not found')
        if not active_for_customer(context.get('customer_id')):
            return {'status': 'draft', 'method': 'draft', 'reason': 'workflows_inactive'}
        context.pop('subject', None)
        context.update(entity_type='time_entry', time_id=None,
                       case_title=context.get('titel'), case_description=context.get('beskrivelse'),
                       hours=minutes / 60, original_hours=minutes / 60,
                       description=description, time_type=time_type, status='pending', worked_date=None)
        customer_id = context.get('customer_id')
        if customer_id:
            cursor.execute("SELECT * FROM customer_fixed_price_agreements WHERE customer_id=%s AND status IN ('active','pending_cancellation') AND start_date<=COALESCE(%s::date,CURRENT_DATE) AND (end_date IS NULL OR end_date>=COALESCE(%s::date,CURRENT_DATE)) AND (cancellation_effective_date IS NULL OR cancellation_effective_date>COALESCE(%s::date,CURRENT_DATE))", (int(customer_id), None, None, None))
            context['agreements'] = cursor.fetchall()
            cursor.execute("SELECT * FROM tticket_prepaid_cards WHERE customer_id=%s AND status='active' AND (expires_at IS NULL OR expires_at>now())", (int(customer_id),))
            context['cards'] = cursor.fetchall()
        else:
            context['agreements'], context['cards'] = [], []
        context['has_active_agreement'] = bool(context['agreements'])
        context['has_active_card'] = bool(context['cards'])
        context['remaining_card_hours'] = context['cards'][0].get('remaining_hours') if len(context['cards']) == 1 else (0 if not context['cards'] else None)
        context['has_available_card'] = any(float(card.get('remaining_hours') or 0) > 0 for card in context['cards'])
        context = enrich_entity_context(cursor, json_safe(context), 'time_entry', None)
        cursor.execute('SELECT w.*,v.id AS version_id,v.definition FROM bmc_workflows w JOIN bmc_workflow_versions v ON v.id=w.active_version_id AND v.workflow_id=w.id WHERE w.enabled=TRUE')
        result = evaluate(cursor.fetchall(), context, 'time.created')
        prediction = {key: result.get(key) for key in ('status', 'method', 'reason')}
        for key in ('agreement_id', 'card_id'):
            if result.get('decision', {}).get(key) is not None:
                prediction[key] = result['decision'][key]
        return prediction