"""WebSocket support for real-time dashboard updates."""

import asyncio
import logging
from datetime import datetime
from typing import Any

from fastapi import APIRouter, WebSocket, WebSocketDisconnect

from guardden.dashboard.config import DashboardSettings
from guardden.dashboard.schemas import WebSocketEvent

logger = logging.getLogger(__name__)


class ConnectionManager:
    """Manage WebSocket connections for real-time updates."""

    def __init__(self) -> None:
        self.active_connections: dict[int, list[WebSocket]] = {}
        self._lock = asyncio.Lock()

    async def connect(self, websocket: WebSocket, guild_id: int) -> None:
        """Accept a new WebSocket connection."""
        await websocket.accept()
        async with self._lock:
            if guild_id not in self.active_connections:
                self.active_connections[guild_id] = []
            self.active_connections[guild_id].append(websocket)
        logger.info("New WebSocket connection for guild %s", guild_id)

    async def disconnect(self, websocket: WebSocket, guild_id: int) -> None:
        """Remove a WebSocket connection."""
        async with self._lock:
            if guild_id in self.active_connections:
                if websocket in self.active_connections[guild_id]:
                    self.active_connections[guild_id].remove(websocket)
                if not self.active_connections[guild_id]:
                    del self.active_connections[guild_id]
        logger.info("WebSocket disconnected for guild %s", guild_id)

    async def broadcast_to_guild(self, guild_id: int, event: WebSocketEvent) -> None:
        """Broadcast an event to all connections for a specific guild."""
        async with self._lock:
            connections = self.active_connections.get(guild_id, []).copy()

        if not connections:
            return

        # Convert event to JSON
        message = event.model_dump_json()

        # Send to all connections
        dead_connections = []
        for connection in connections:
            try:
                await connection.send_text(message)
            except Exception as e:
                logger.warning("Failed to send message to WebSocket: %s", e)
                dead_connections.append(connection)

        # Clean up dead connections
        if dead_connections:
            async with self._lock:
                if guild_id in self.active_connections:
                    for conn in dead_connections:
                        if conn in self.active_connections[guild_id]:
                            self.active_connections[guild_id].remove(conn)
                    if not self.active_connections[guild_id]:
                        del self.active_connections[guild_id]

    async def broadcast_to_all(self, event: WebSocketEvent) -> None:
        """Broadcast an event to all connections."""
        async with self._lock:
            all_guilds = list(self.active_connections.keys())

        for guild_id in all_guilds:
            await self.broadcast_to_guild(guild_id, event)

    def get_connection_count(self, guild_id: int | None = None) -> int:
        """Get the number of active connections."""
        if guild_id is not None:
            return len(self.active_connections.get(guild_id, []))
        return sum(len(conns) for conns in self.active_connections.values())


# Global connection manager
connection_manager = ConnectionManager()


def create_websocket_router(settings: DashboardSettings) -> APIRouter:
    """Create the WebSocket API router."""
    router = APIRouter()

    @router.websocket("/ws/events")
    async def websocket_events(websocket: WebSocket, guild_id: int) -> None:
        """WebSocket endpoint for real-time events."""
        await connection_manager.connect(websocket, guild_id)
        try:
            # Send initial connection confirmation
            await websocket.send_json(
                {
                    "type": "connected",
                    "guild_id": guild_id,
                    "timestamp": datetime.now().isoformat(),
                    "data": {"message": "Connected to real-time events"},
                }
            )

            # Keep connection alive and handle incoming messages
            while True:
                try:
                    # Wait for messages from client (ping/pong, etc.)
                    data = await asyncio.wait_for(websocket.receive_text(), timeout=30.0)

                    # Echo back as heartbeat
                    if data == "ping":
                        await websocket.send_text("pong")

                except asyncio.TimeoutError:
                    # Send periodic ping to keep connection alive
                    await websocket.send_json(
                        {
                            "type": "ping",
                            "guild_id": guild_id,
                            "timestamp": datetime.now().isoformat(),
                            "data": {},
                        }
                    )

        except WebSocketDisconnect:
            logger.info("Client disconnected from WebSocket for guild %s", guild_id)
        except Exception as e:
            logger.error("WebSocket error for guild %s: %s", guild_id, e)
        finally:
            await connection_manager.disconnect(websocket, guild_id)

    return router


# Helper functions to broadcast events from other parts of the application
async def broadcast_moderation_action(
    guild_id: int,
    action: str,
    target_id: int,
    target_name: str,
    moderator_name: str,
    reason: str | None = None,
) -> None:
    """Broadcast a moderation action event."""
    event = WebSocketEvent(
        type="moderation_action",
        guild_id=guild_id,
        timestamp=datetime.now(),
        data={
            "action": action,
            "target_id": target_id,
            "target_name": target_name,
            "moderator_name": moderator_name,
            "reason": reason,
        },
    )
    await connection_manager.broadcast_to_guild(guild_id, event)


async def broadcast_user_join(
    guild_id: int,
    user_id: int,
    username: str,
) -> None:
    """Broadcast a user join event."""
    event = WebSocketEvent(
        type="user_join",
        guild_id=guild_id,
        timestamp=datetime.now(),
        data={
            "user_id": user_id,
            "username": username,
        },
    )
    await connection_manager.broadcast_to_guild(guild_id, event)


async def broadcast_ai_alert(
    guild_id: int,
    user_id: int,
    severity: str,
    category: str,
    confidence: float,
) -> None:
    """Broadcast an AI moderation alert."""
    event = WebSocketEvent(
        type="ai_alert",
        guild_id=guild_id,
        timestamp=datetime.now(),
        data={
            "user_id": user_id,
            "severity": severity,
            "category": category,
            "confidence": confidence,
        },
    )
    await connection_manager.broadcast_to_guild(guild_id, event)


async def broadcast_system_event(
    event_type: str,
    data: dict[str, Any],
    guild_id: int | None = None,
) -> None:
    """Broadcast a generic system event."""
    event = WebSocketEvent(
        type=event_type,
        guild_id=guild_id or 0,
        timestamp=datetime.now(),
        data=data,
    )
    if guild_id:
        await connection_manager.broadcast_to_guild(guild_id, event)
    else:
        await connection_manager.broadcast_to_all(event)