import jinja2
from channels.db import database_sync_to_async
from core.settings import PRIMARY_HOST

from notifications.models import MessageTemplate

# auto_reply_title = f"Re: {{ ticket_name }} [#{{ ticket_uuid }}]"


TEMLATE_VARS = ['ticket_name', 'ticket_uuid', 'ticket_id', 'ticket_url',
                'event_slug', 'event_name',
                'username', 'user_nick',
                'web_host']  # TODO customer_name, tracking_code


def limit_length(s, length=50):
    if len(s) > length:
        return s[:(length - 3)] + "..."
    return s


def ticket_url(ticket):
    eventslug = ticket.event.slug if ticket.event else "37C3"  # TODO 37C3 should not be hardcoded
    return f"https://{PRIMARY_HOST}/{eventslug}/ticket/{ticket.id}/"


def render_template(template, **kwargs):
    try:

        environment = jinja2.Environment()
        environment.filters['limit_length'] = limit_length

        tmpl = MessageTemplate.objects.get(name=template)
        template = environment.from_string(tmpl.message)
        return template.render(**kwargs, web_host=PRIMARY_HOST)
    except MessageTemplate.DoesNotExist:
        return None


def render_auto_reply(ticket):
    eventslug = ticket.event.slug if ticket.event else "37C3"  # TODO 37C3 should not be hardcoded
    return render_template('auto_reply', ticket_name=ticket.name, ticket_uuid=ticket.short_uuid(),
                           ticket_id=ticket.id, event_slug=eventslug, ticket_url=ticket_url(ticket))


def render_notification_new_ticket(ticket):
    eventslug = ticket.event.slug if ticket.event else "37C3"  # TODO 37C3 should not be hardcoded
    return render_template('new_issue_notification', ticket_name=ticket.name, ticket_uuid=ticket.short_uuid(),
                           ticket_id=ticket.id, event_slug=eventslug, ticket_url=ticket_url(ticket))


async def render_notification_new_ticket_async(ticket):
    return await database_sync_to_async(render_notification_new_ticket)(ticket)


def render_notification_reply_ticket(ticket):
    eventslug = ticket.event.slug if ticket.event else "37C3"  # TODO 37C3 should not be hardcoded
    return render_template('reply_issue_notification', ticket_name=ticket.name, ticket_uuid=ticket.short_uuid(),
                           ticket_id=ticket.id, event_slug=eventslug, ticket_url=ticket_url(ticket))


async def render_notification_reply_ticket_async(ticket):
    return await database_sync_to_async(render_notification_reply_ticket)(ticket)