from rest_framework import routers, viewsets, serializers

from tickets.models import IssueThread, Comment, StateChange


class IssueSerializer(serializers.ModelSerializer):
    timeline = serializers.SerializerMethodField()

    class Meta:
        model = IssueThread
        fields = ('id', 'timeline', 'name', 'state', 'assigned_to', 'last_activity')
        read_only_fields = ('id', 'timeline', 'last_activity')

    @staticmethod
    def get_timeline(obj):
        timeline = []
        for comment in obj.comments.all():
            timeline.append({
                'type': 'comment',
                'id': comment.id,
                'timestamp': comment.timestamp,
                'comment': comment.comment,
            })
        for state_change in obj.state_changes.all():
            timeline.append({
                'type': 'state',
                'id': state_change.id,
                'timestamp': state_change.timestamp,
                'state': state_change.state,
            })
        for email in obj.emails.all():
            timeline.append({
                'type': 'mail',
                'id': email.id,
                'timestamp': email.timestamp,
                'sender': email.sender,
                'recipient': email.recipient,
                'subject': email.subject,
                'body': email.body,
            })
        return sorted(timeline, key=lambda x: x['timestamp'])


class IssueViewSet(viewsets.ModelViewSet):
    serializer_class = IssueSerializer
    queryset = IssueThread.objects.all()
    permission_classes = []
    authentication_classes = []


router = routers.SimpleRouter()
router.register(r'tickets', IssueViewSet, basename='issues')

urlpatterns = router.urls