/**
 * useCollaboration - Hook for real-time collaborative map editing
 *
 * Uses Y.js for CRDT-based synchronization, enabling:
 * - Real-time waypoint/route sharing
 * - Cursor presence awareness
 * - Conflict-free concurrent edits
 * - Offline-first with sync on reconnect
 */

import { useState, useEffect, useCallback } from 'react';
import type {
  CollaborationSession,
  Participant,
  Route,
  Waypoint,
  MapLayer,
  Coordinate,
} from '../types';

interface UseCollaborationOptions {
  sessionId?: string;
  userId: string;
  userName: string;
  userColor?: string;
  serverUrl?: string;
  onParticipantJoin?: (participant: Participant) => void;
  onParticipantLeave?: (participantId: string) => void;
  onRouteUpdate?: (routes: Route[]) => void;
  onWaypointUpdate?: (waypoints: Waypoint[]) => void;
}

interface UseCollaborationReturn {
  session: CollaborationSession | null;
  participants: Participant[];
  isConnected: boolean;
  createSession: (name: string) => Promise<string>;
  joinSession: (sessionId: string) => Promise<void>;
  leaveSession: () => void;
  updateCursor: (coordinate: Coordinate) => void;
  broadcastRouteChange: (route: Route) => void;
  broadcastWaypointChange: (waypoint: Waypoint) => void;
  broadcastLayerChange: (layer: MapLayer) => void;
}

export function useCollaboration({
  sessionId,
  userId: _userId,
  userName: _userName,
  userColor: _userColor = '#3B82F6',
  serverUrl,
  onParticipantJoin: _onParticipantJoin,
  onParticipantLeave: _onParticipantLeave,
  onRouteUpdate: _onRouteUpdate,
  onWaypointUpdate: _onWaypointUpdate,
}: UseCollaborationOptions): UseCollaborationReturn {
  const [session, setSession] = useState<CollaborationSession | null>(null);
  const [participants, setParticipants] = useState<Participant[]>([]);
  const [isConnected, setIsConnected] = useState(false);

  // TODO: Initialize Y.js document and WebSocket provider
  useEffect(() => {
    if (!sessionId) return;

    // const ydoc = new Y.Doc();
    // const provider = new WebsocketProvider(serverUrl, sessionId, ydoc);

    setIsConnected(true);

    return () => {
      // provider.destroy();
      // ydoc.destroy();
      setIsConnected(false);
    };
  }, [sessionId, serverUrl]);

  const createSession = useCallback(async (_name: string): Promise<string> => {
    // TODO: Create new Y.js document and return session ID
    const newSessionId = `session-${Date.now()}`;
    return newSessionId;
  }, []);

  const joinSession = useCallback(async (_sessionIdToJoin: string): Promise<void> => {
    // TODO: Join existing Y.js session
  }, []);

  const leaveSession = useCallback(() => {
    // TODO: Disconnect from session
    setSession(null);
    setParticipants([]);
    setIsConnected(false);
  }, []);

  const updateCursor = useCallback((_coordinate: Coordinate) => {
    // TODO: Broadcast cursor position via Y.js awareness
    // awareness.setLocalStateField('cursor', coordinate);
  }, []);

  const broadcastRouteChange = useCallback((_route: Route) => {
    // TODO: Update Y.js shared route array
  }, []);

  const broadcastWaypointChange = useCallback((_waypoint: Waypoint) => {
    // TODO: Update Y.js shared waypoint array
  }, []);

  const broadcastLayerChange = useCallback((_layer: MapLayer) => {
    // TODO: Update Y.js shared layer array
  }, []);

  return {
    session,
    participants,
    isConnected,
    createSession,
    joinSession,
    leaveSession,
    updateCursor,
    broadcastRouteChange,
    broadcastWaypointChange,
    broadcastLayerChange,
  };
}

export default useCollaboration;
