# Copyright (c) 2023-present Plane Software, Inc. and contributors
# SPDX-License-Identifier: AGPL-3.0-only
# See the LICENSE file for details.

import json
import logging
from uuid import uuid4

from django.core.serializers.json import DjangoJSONEncoder
from django.db import transaction
from django.utils import timezone

from plane.settings.redis import redis_instance

logger = logging.getLogger(__name__)

NODEDC_EVENT_CHANNEL_PREFIX = "plane:nodedc-events:user"


def nodedc_user_event_channel(user_id):
    return f"{NODEDC_EVENT_CHANNEL_PREFIX}:{user_id}"


def _normalize_user_ids(user_ids):
    normalized_user_ids = []
    seen_user_ids = set()

    for user_id in user_ids or []:
        if not user_id:
            continue
        normalized_user_id = str(user_id)
        if normalized_user_id in seen_user_ids:
            continue
        seen_user_ids.add(normalized_user_id)
        normalized_user_ids.append(normalized_user_id)

    return normalized_user_ids


def _publish_payload_to_users(user_ids, payload):
    client = redis_instance()
    for user_id in _normalize_user_ids(user_ids):
        client.publish(
            nodedc_user_event_channel(user_id),
            json.dumps({**payload, "target_user_id": user_id}, cls=DjangoJSONEncoder),
        )


def publish_nodedc_event_to_users_on_commit(event_type, user_ids, payload=None):
    event_payload = {
        "event_id": str(uuid4()),
        "type": event_type,
        "emitted_at": timezone.now(),
        **(payload or {}),
    }

    def _publish():
        try:
            _publish_payload_to_users(user_ids, event_payload)
        except Exception:
            logger.exception("Failed to publish NODE.DC realtime event")

    transaction.on_commit(_publish)


def publish_nodedc_workspace_event_on_commit(workspace, event_type, payload=None, extra_user_ids=None):
    workspace_payload = {
        "workspace_id": str(workspace.id),
        "workspace_slug": workspace.slug,
        **(payload or {}),
    }
    extra_user_ids = _normalize_user_ids(extra_user_ids or [])

    def _publish():
        try:
            from plane.db.models import WorkspaceMember

            workspace_user_ids = WorkspaceMember.objects.filter(
                workspace_id=workspace.id,
                is_active=True,
                member__is_bot=False,
                deleted_at__isnull=True,
            ).values_list("member_id", flat=True)

            _publish_payload_to_users(
                [*workspace_user_ids, *extra_user_ids],
                {
                    "event_id": str(uuid4()),
                    "type": event_type,
                    "emitted_at": timezone.now(),
                    **workspace_payload,
                },
            )
        except Exception:
            logger.exception("Failed to publish NODE.DC workspace realtime event")

    transaction.on_commit(_publish)


def publish_nodedc_user_profile_event_on_commit(user, changed_fields=None):
    changed_fields = sorted(set(changed_fields or []))
    payload = {
        "member_id": str(user.id),
        "email": user.email,
        "display_name": user.display_name,
        "avatar": user.avatar or None,
        "changed_fields": changed_fields,
    }

    def _publish():
        try:
            from plane.db.models import WorkspaceMember

            memberships = (
                WorkspaceMember.objects.filter(
                    member_id=user.id,
                    is_active=True,
                    deleted_at__isnull=True,
                )
                .select_related("workspace")
                .only("workspace_id", "workspace__slug")
            )

            workspace_ids = []
            client = redis_instance()
            for membership in memberships:
                workspace_ids.append(str(membership.workspace_id))
                workspace_user_ids = WorkspaceMember.objects.filter(
                    workspace_id=membership.workspace_id,
                    is_active=True,
                    member__is_bot=False,
                    deleted_at__isnull=True,
                ).values_list("member_id", flat=True)
                event_payload = {
                    "event_id": str(uuid4()),
                    "type": "user.profile.updated",
                    "emitted_at": timezone.now(),
                    "workspace_id": str(membership.workspace_id),
                    "workspace_slug": membership.workspace.slug,
                    **payload,
                }
                for target_user_id in _normalize_user_ids([*workspace_user_ids, user.id]):
                    client.publish(
                        nodedc_user_event_channel(target_user_id),
                        json.dumps({**event_payload, "target_user_id": target_user_id}, cls=DjangoJSONEncoder),
                    )

            if not workspace_ids:
                _publish_payload_to_users(
                    [user.id],
                    {
                        "event_id": str(uuid4()),
                        "type": "user.profile.updated",
                        "emitted_at": timezone.now(),
                        **payload,
                    },
                )
        except Exception:
            logger.exception("Failed to publish NODE.DC profile realtime event")

    transaction.on_commit(_publish)