"""Notification tools for MCP."""

from typing import Optional

from channels.db import database_sync_to_async

from core.mcp.auth import MCPContext, Role, execute_graphql
from core.mcp.base import mcp, json_response, error_response, logger


@mcp.tool()
async def get_my_notifications(
    unread_only: bool = False,
    limit: int = 50,
    offset: int = 0
) -> str:
    """
    Get your notifications.

    Args:
        unread_only: If true, only return unread notifications
        limit: Maximum notifications to return (default 50)
        offset: Pagination offset

    Returns:
        JSON array of notification objects
    """
    profile = MCPContext.get_profile()
    if not profile:
        return error_response("No active profile. Call set_active_profile first.")

    query = """
        query GetNotifications($unreadOnly: Boolean, $limit: Int, $offset: Int) {
            myNotifications(unreadOnly: $unreadOnly, limit: $limit, offset: $offset) {
                id
                subject
                body
                status
                actionUrl
                readAt
                createdAt
                event {
                    eventType
                    entityType
                    entityId
                }
            }
        }
    """

    result = await execute_graphql(query, {
        "unreadOnly": unread_only,
        "limit": limit,
        "offset": offset
    })

    if "errors" in result:
        return json_response(result)

    return json_response(result["data"]["myNotifications"] or [])


@mcp.tool()
async def get_unread_notification_count() -> str:
    """
    Get the count of unread notifications.

    Returns:
        JSON object with unread count
    """
    profile = MCPContext.get_profile()
    if not profile:
        return error_response("No active profile. Call set_active_profile first.")

    query = """
        query GetUnreadCount {
            myUnreadNotificationCount
        }
    """

    result = await execute_graphql(query)

    if "errors" in result:
        return json_response(result)

    return json_response({"unread_count": result["data"]["myUnreadNotificationCount"]})


@mcp.tool()
async def mark_notification_read(notification_id: str) -> str:
    """
    Mark a notification as read.

    Args:
        notification_id: UUID of the notification

    Returns:
        JSON object confirming the notification was marked read
    """
    profile = MCPContext.get_profile()
    if not profile:
        return error_response("No active profile. Call set_active_profile first.")

    mutation = """
        mutation MarkRead($id: ID!) {
            markNotificationAsRead(id: $id) {
                id
                status
                readAt
            }
        }
    """

    result = await execute_graphql(mutation, {"id": notification_id})

    if "errors" in result:
        return json_response(result)

    return json_response({
        "success": True,
        "notification": result["data"]["markNotificationAsRead"]
    })


@mcp.tool()
async def mark_all_notifications_read() -> str:
    """
    Mark all unread notifications as read.

    Returns:
        JSON object with count of notifications marked read
    """
    profile = MCPContext.get_profile()
    if not profile:
        return error_response("No active profile. Call set_active_profile first.")

    mutation = """
        mutation MarkAllRead {
            markAllNotificationsAsRead
        }
    """

    result = await execute_graphql(mutation)

    if "errors" in result:
        return json_response(result)

    return json_response({
        "success": True,
        "count_marked": result["data"]["markAllNotificationsAsRead"]
    })


@mcp.tool()
async def list_my_notification_rules() -> str:
    """
    List notification rules that apply to you.
    - ADMIN: See all rules
    - Others: See rules targeting their role or profile

    Returns:
        JSON array of notification rule objects
    """
    profile = MCPContext.get_profile()
    if not profile:
        return error_response("No active profile. Call set_active_profile first.")

    from core.models import NotificationRule

    @database_sync_to_async
    def fetch():
        if profile.role == Role.ADMIN.value:
            qs = NotificationRule.objects.filter(is_active=True)
        else:
            from django.db.models import Q
            qs = NotificationRule.objects.filter(
                Q(is_active=True) & (
                    Q(target_roles__contains=[profile.role]) |
                    Q(target_team_profiles__id=profile.id)
                )
            ).distinct()

        return [
            {
                "id": str(r.id),
                "name": r.name,
                "description": r.description,
                "event_types": r.event_types,
                "channels": r.channels,
                "target_roles": r.target_roles,
                "is_personal": r.target_team_profiles.filter(id=profile.id).exists()
            }
            for r in qs
        ]

    rules = await fetch()
    return json_response(rules)


@mcp.tool()
async def create_personal_notification_rule(
    name: str,
    event_types: str,
    channels: str,
    description: Optional[str] = None,
    template_subject: Optional[str] = None,
    template_body: Optional[str] = None
) -> str:
    """
    Create a personal notification rule (scoped to yourself only).

    Args:
        name: Rule name
        event_types: Comma-separated event types (e.g., 'SERVICE_COMPLETED,PROJECT_COMPLETED')
        channels: Comma-separated channels (IN_APP, EMAIL, SMS)
        description: Optional description
        template_subject: Optional subject template
        template_body: Optional body template

    Returns:
        JSON object with created rule
    """
    profile = MCPContext.get_profile()
    if not profile:
        return error_response("No active profile. Call set_active_profile first.")

    from core.models import NotificationRule

    event_list = [e.strip() for e in event_types.split(",")]
    channel_list = [c.strip() for c in channels.split(",")]

    @database_sync_to_async
    def create():
        rule = NotificationRule.objects.create(
            name=name,
            description=description or "",
            event_types=event_list,
            channels=channel_list,
            template_subject=template_subject or "",
            template_body=template_body or "",
            is_active=True
        )
        rule.target_team_profiles.add(profile)
        return {
            "id": str(rule.id),
            "name": rule.name,
            "event_types": rule.event_types,
            "channels": rule.channels,
            "is_personal": True
        }

    try:
        rule = await create()
        return json_response({"success": True, "rule": rule})
    except Exception as e:
        logger.error(f"Error creating notification rule: {e}")
        return error_response(str(e))