from django import template
from django.urls import reverse
from django.utils.safestring import mark_safe

register = template.Library()


@register.simple_tag(takes_context=True)
def feedbackbutton(context):
    """ A templatetag to show a suitable button for EventFeedback """

    if context.request.user.is_anonymous:
        return None

    event = context["event"]
    if event.proposal and event.proposal.user == context.request.user:
        # current user is the event owner, show a link to EventFeedbackList
        return mark_safe(
            "<a class='btn btn-primary' href='%s'><i class='fas fa-comments'></i> Read Feedback (%s)</a>"
            % (
                reverse(
                    "program:eventfeedback_list",
                    kwargs={"camp_slug": event.camp.slug, "event_slug": event.slug},
                ),
                event.feedbacks.filter(approved=True).count(),
            )
        )
    # FIXME: for some reason this triggers a lookup even though all feedbacks have been prefetched..
    elif event.feedbacks.filter(user=context.request.user).exists():
        # this user already submitted feedback for this event, show a link to DetailView
        return mark_safe(
            "<a class='btn btn-default' href='%s'><i class='fas fa-comment-dots'></i> Change Feedback</a>"
            % (
                reverse(
                    "program:eventfeedback_detail",
                    kwargs={"camp_slug": event.camp.slug, "event_slug": event.slug},
                )
            )
        )
    else:
        # this user has not submitted feedback yet, show a link to CreateView
        return mark_safe(
            "<a class='btn btn-success' href='%s'><i class='fas fa-comment'></i> Add Feedback</a>"
            % (
                reverse(
                    "program:eventfeedback_create",
                    kwargs={"camp_slug": event.camp.slug, "event_slug": event.slug},
                )
            )
        )