using System;
using WebSocketSharp;
using WebSocketSharp.Server;
using UnityEngine;

namespace KindRetargeting.Remote
{
    /// <summary>
    /// WebSocket 서버 - 실시간 양방향 통신을 담당합니다.
    /// </summary>
    public class RetargetingWebSocketServer
    {
        private WebSocketServer wss;
        private int port;
        private bool isRunning = false;

        public bool IsRunning => isRunning;
        public int Port => port;

        public event Action<string> OnMessageReceived;

        public RetargetingWebSocketServer(int port)
        {
            this.port = port;
        }

        public void Start()
        {
            if (isRunning) return;

            try
            {
                wss = new WebSocketServer(port);
                wss.AddWebSocketService<RetargetingBehavior>("/retargeting", behavior =>
                {
                    behavior.OnMessageReceivedCallback = (msg) => OnMessageReceived?.Invoke(msg);
                });

                wss.Start();
                isRunning = true;

                Debug.Log($"[RetargetingWS] WebSocket 서버 시작됨 (포트: {port})");
            }
            catch (Exception ex)
            {
                Debug.LogError($"[RetargetingWS] 서버 시작 실패: {ex.Message}");
            }
        }

        public void Stop()
        {
            if (!isRunning) return;

            try
            {
                wss?.Stop();
            }
            catch (Exception) { }

            isRunning = false;
            Debug.Log("[RetargetingWS] WebSocket 서버 중지됨");
        }

        public void Broadcast(string message)
        {
            if (!isRunning || wss == null) return;

            try
            {
                wss.WebSocketServices["/retargeting"].Sessions.Broadcast(message);
            }
            catch (Exception ex)
            {
                Debug.LogError($"[RetargetingWS] 브로드캐스트 실패: {ex.Message}");
            }
        }

        /// <summary>
        /// WebSocket 동작 핸들러
        /// </summary>
        private class RetargetingBehavior : WebSocketBehavior
        {
            public Action<string> OnMessageReceivedCallback;

            protected override void OnOpen()
            {
                // 연결 시 로그 제거 (문서 요청에 따름)
            }

            protected override void OnClose(CloseEventArgs e)
            {
                // 연결 종료 시 로그 제거
            }

            protected override void OnMessage(MessageEventArgs e)
            {
                // 로그 제거 (문서 요청에 따름)
                OnMessageReceivedCallback?.Invoke(e.Data);
            }

            protected override void OnError(ErrorEventArgs e)
            {
                Debug.LogError($"[RetargetingWS] 오류: {e.Message}");
            }
        }
    }
}