# Python imports
import json

# Django import
from django.utils import timezone
from django.db.models import Q, OuterRef, Func, F, Prefetch
from django.core.serializers.json import DjangoJSONEncoder

# Third party imports
from rest_framework import status
from rest_framework.response import Response

# Module imports
from .base import BaseViewSet
from plane.db.models import IntakeIssue, Issue, IssueLink, FileAsset, DeployBoard
from plane.app.serializers import (
    IssueSerializer,
    IntakeIssueSerializer,
    IssueCreateSerializer,
    IssueStateIntakeSerializer,
)
from plane.utils.issue_filters import issue_filters
from plane.bgtasks.issue_activities_task import issue_activity
from plane.db.models.intake import SourceType


class IntakeIssuePublicViewSet(BaseViewSet):
    serializer_class = IntakeIssueSerializer
    model = IntakeIssue

    filterset_fields = ["status"]

    def get_queryset(self):
        project_deploy_board = DeployBoard.objects.get(
            workspace__slug=self.kwargs.get("slug"),
            project_id=self.kwargs.get("project_id"),
        )
        if project_deploy_board is not None:
            return self.filter_queryset(
                super()
                .get_queryset()
                .filter(
                    Q(snoozed_till__gte=timezone.now()) | Q(snoozed_till__isnull=True),
                    project_id=self.kwargs.get("project_id"),
                    workspace__slug=self.kwargs.get("slug"),
                    intake_id=self.kwargs.get("intake_id"),
                )
                .select_related("issue", "workspace", "project")
            )
        return IntakeIssue.objects.none()

    def list(self, request, anchor, intake_id):
        project_deploy_board = DeployBoard.objects.get(anchor=anchor, entity_name="project")
        if project_deploy_board.intake is None:
            return Response(
                {"error": "Intake is not enabled for this Project Board"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        filters = issue_filters(request.query_params, "GET")
        issues = (
            Issue.objects.filter(
                issue_intake__intake_id=intake_id,
                workspace_id=project_deploy_board.workspace_id,
                project_id=project_deploy_board.project_id,
            )
            .filter(**filters)
            .annotate(bridge_id=F("issue_intake__id"))
            .select_related("workspace", "project", "state", "parent")
            .prefetch_related("assignees", "labels")
            .order_by("issue_intake__snoozed_till", "issue_intake__status")
            .annotate(
                sub_issues_count=Issue.issue_objects.filter(parent=OuterRef("id"))
                .order_by()
                .annotate(count=Func(F("id"), function="Count"))
                .values("count")
            )
            .annotate(
                link_count=IssueLink.objects.filter(issue=OuterRef("id"))
                .order_by()
                .annotate(count=Func(F("id"), function="Count"))
                .values("count")
            )
            .annotate(
                attachment_count=FileAsset.objects.filter(
                    issue_id=OuterRef("id"),
                    entity_type=FileAsset.EntityTypeContext.ISSUE_ATTACHMENT,
                )
                .order_by()
                .annotate(count=Func(F("id"), function="Count"))
                .values("count")
            )
            .prefetch_related(
                Prefetch(
                    "issue_intake",
                    queryset=IntakeIssue.objects.only("status", "duplicate_to", "snoozed_till", "source"),
                )
            )
        )
        issues_data = IssueStateIntakeSerializer(issues, many=True).data
        return Response(issues_data, status=status.HTTP_200_OK)

    def create(self, request, anchor, intake_id):
        project_deploy_board = DeployBoard.objects.get(anchor=anchor, entity_name="project")
        if project_deploy_board.intake is None:
            return Response(
                {"error": "Intake is not enabled for this Project Board"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        if not request.data.get("issue", {}).get("name", False):
            return Response({"error": "Name is required"}, status=status.HTTP_400_BAD_REQUEST)

        # Check for valid priority
        if request.data.get("issue", {}).get("priority", "none") not in [
            "low",
            "medium",
            "high",
            "urgent",
            "none",
        ]:
            return Response({"error": "Invalid priority"}, status=status.HTTP_400_BAD_REQUEST)

        # create an issue
        issue = Issue.objects.create(
            name=request.data.get("issue", {}).get("name"),
            description=request.data.get("issue", {}).get("description", {}),
            description_html=request.data.get("issue", {}).get("description_html", "<p></p>"),
            priority=request.data.get("issue", {}).get("priority", "low"),
            project_id=project_deploy_board.project_id,
        )

        # Create an Issue Activity
        issue_activity.delay(
            type="issue.activity.created",
            requested_data=json.dumps(request.data, cls=DjangoJSONEncoder),
            actor_id=str(request.user.id),
            issue_id=str(issue.id),
            project_id=str(project_deploy_board.project_id),
            current_instance=None,
            epoch=int(timezone.now().timestamp()),
        )
        # create an intake issue
        IntakeIssue.objects.create(
            intake_id=intake_id,
            project_id=project_deploy_board.project_id,
            issue=issue,
            source=SourceType.IN_APP,
        )

        serializer = IssueStateIntakeSerializer(issue)
        return Response(serializer.data, status=status.HTTP_200_OK)

    def partial_update(self, request, anchor, intake_id, pk):
        project_deploy_board = DeployBoard.objects.get(anchor=anchor, entity_name="project")
        if project_deploy_board.intake is None:
            return Response(
                {"error": "Intake is not enabled for this Project Board"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        intake_issue = IntakeIssue.objects.get(
            pk=pk,
            workspace_id=project_deploy_board.workspace_id,
            project_id=project_deploy_board.project_id,
            intake_id=intake_id,
        )
        # Get the project member
        if str(intake_issue.created_by_id) != str(request.user.id):
            return Response(
                {"error": "You cannot edit intake issues"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        # Get issue data
        issue_data = request.data.pop("issue", False)

        issue = Issue.objects.get(
            pk=intake_issue.issue_id,
            workspace_id=project_deploy_board.workspace_id,
            project_id=project_deploy_board.project_id,
        )
        # viewers and guests since only viewers and guests
        issue_data = {
            "name": issue_data.get("name", issue.name),
            "description_html": issue_data.get("description_html", issue.description_html),
            "description": issue_data.get("description", issue.description),
        }

        issue_serializer = IssueCreateSerializer(
            issue,
            data=issue_data,
            partial=True,
            context={"project_id": project_deploy_board.project_id},
        )

        if issue_serializer.is_valid():
            current_instance = issue
            # Log all the updates
            requested_data = json.dumps(issue_data, cls=DjangoJSONEncoder)
            if issue is not None:
                issue_activity.delay(
                    type="issue.activity.updated",
                    requested_data=requested_data,
                    actor_id=str(request.user.id),
                    issue_id=str(issue.id),
                    project_id=str(project_deploy_board.project_id),
                    current_instance=json.dumps(IssueSerializer(current_instance).data, cls=DjangoJSONEncoder),
                    epoch=int(timezone.now().timestamp()),
                )
            issue_serializer.save()
            return Response(issue_serializer.data, status=status.HTTP_200_OK)
        return Response(issue_serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def retrieve(self, request, anchor, intake_id, pk):
        project_deploy_board = DeployBoard.objects.get(anchor=anchor, entity_name="project")
        if project_deploy_board.intake is None:
            return Response(
                {"error": "Intake is not enabled for this Project Board"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        intake_issue = IntakeIssue.objects.get(
            pk=pk,
            workspace_id=project_deploy_board.workspace_id,
            project_id=project_deploy_board.project_id,
            intake_id=intake_id,
        )
        issue = Issue.objects.get(
            pk=intake_issue.issue_id,
            workspace_id=project_deploy_board.workspace_id,
            project_id=project_deploy_board.project_id,
        )
        serializer = IssueStateIntakeSerializer(issue)
        return Response(serializer.data, status=status.HTTP_200_OK)

    def destroy(self, request, anchor, intake_id, pk):
        project_deploy_board = DeployBoard.objects.get(anchor=anchor, entity_name="project")
        if project_deploy_board.intake is None:
            return Response(
                {"error": "Intake is not enabled for this Project Board"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        intake_issue = IntakeIssue.objects.get(
            pk=pk,
            workspace_id=project_deploy_board.workspace_id,
            project_id=project_deploy_board.project_id,
            intake_id=intake_id,
        )

        if str(intake_issue.created_by_id) != str(request.user.id):
            return Response(
                {"error": "You cannot delete intake issue"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        intake_issue.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)
