using System;
using System.Collections;
using AOT.Boot;
using UnityEngine;

namespace HotUpdate.Net
{
    /// <summary>
    /// 登录 → WS 连接编排（含指数退避重连与维护公告）。
    /// </summary>
    public sealed class GameNet : MonoBehaviour
    {
        public string HttpBase = AuthApi.DefaultHttpBase;
        public string WsUrlTemplate = "wss://game.xworld.ren/ws?pid={pid}&token={token}";

        public SessionData Session { get; private set; }
        public WsClient Socket { get; private set; }
        public string Status { get; private set; } = "idle";

        public event Action<SessionData> OnAuthed;
        public event Action OnWsReady;
        public event Action<string> OnStatus;
        public event Action<string> OnWsMessage;
        public event Action<string> OnWsDisconnected;
        public event Action<int> OnReconnecting;
        public event Action<string> OnMaintenance;

        BootContext _boot;
        bool _started;
        bool _maintenance;
        bool _everConnected;

        public void Bind(BootContext boot)
        {
            _boot = boot;
            if (_boot == null) return;

            if (!string.IsNullOrEmpty(_boot.HttpBase))
                HttpBase = _boot.HttpBase;

            if (!string.IsNullOrEmpty(_boot.WsUrlTemplate))
            {
                var tpl = _boot.WsUrlTemplate;
                if (!tpl.Contains("{token}"))
                {
                    tpl = tpl.Contains("?")
                        ? tpl + (tpl.EndsWith("?") || tpl.EndsWith("&") ? "token={token}" : "&token={token}")
                        : tpl + "?pid={pid}&token={token}";
                }
                WsUrlTemplate = tpl;
            }
        }

        public void StartGuestSession()
        {
            if (_started) return;
            _started = true;
            StartCoroutine(RunGuestFlow());
        }

        /// <summary>UI「立即重连」：重置退避并马上再连。</summary>
        public void RequestReconnect()
        {
            if (_maintenance || Session == null || !Session.IsValid) return;
            SetStatus("手动重连…");
            if (Socket != null)
            {
                Socket.AutoReconnect = true;
                Socket.ForceReconnect();
            }
            else
                StartCoroutine(ConnectWs());
        }

        public void NotifyMaintenance(string message)
        {
            if (_maintenance) return;
            _maintenance = true;
            if (Socket != null)
            {
                Socket.AutoReconnect = false;
                Socket.Close();
            }
            SetStatus("maintenance");
            OnMaintenance?.Invoke(message ?? "服务器维护中");
        }

        IEnumerator RunGuestFlow()
        {
            SetStatus("auth…");
            var deviceId = DeviceId.GetOrCreate();
            var username = $"guest_{deviceId}";
            var password = $"pw_{deviceId}";

            AuthResponse auth = null;
            string err = null;
            yield return AuthApi.EnsureAccount(HttpBase, username, password, (r, e) => { auth = r; err = e; });

            if (auth == null || string.IsNullOrEmpty(auth.token))
            {
                SetStatus($"auth fail: {err}");
                Debug.LogError($"[GameNet] auth failed: {err}");
                yield break;
            }

            Session = new SessionData
            {
                Username = username,
                Token = auth.token,
                Pid = auth.pid,
                DeviceId = deviceId,
            };
            Debug.Log($"[GameNet] authed pid={Session.Pid} user={username}");
            OnAuthed?.Invoke(Session);
            SetStatus($"authed pid={Session.Pid}");

            yield return ConnectWs();
        }

        IEnumerator ConnectWs()
        {
            if (_maintenance) yield break;
            if (Session == null || !Session.IsValid)
            {
                SetStatus("no session");
                yield break;
            }

            SetStatus("ws connecting…");
            Socket?.Dispose();
            Socket = new WsClient();
            Socket.AutoReconnect = true;
            Socket.OnConnected += HandleConnected;
            Socket.OnDisconnected += HandleDisconnected;
            Socket.OnReconnecting += attempt =>
            {
                SetStatus($"ws reconnecting #{attempt}");
                OnReconnecting?.Invoke(attempt);
            };
            Socket.OnMessage += msg =>
            {
                Debug.Log($"[GameNet] << {msg}");
                OnWsMessage?.Invoke(msg);
            };

            var url = Session.BuildWsUrl(WsUrlTemplate);
            Socket.Connect(url);

            float t = 0f;
            while (t < 15f && Socket.State != WsState.Connected && Socket.State != WsState.Disconnected)
            {
                t += Time.unscaledDeltaTime;
                yield return null;
            }

            if (Socket.State == WsState.Connected)
                SetStatus("ws connected");
            else if (Socket.State == WsState.Disconnected && !string.IsNullOrEmpty(Socket.LastError))
                SetStatus($"ws fail: {Socket.LastError}");
            else if (Socket.State != WsState.Connected)
                SetStatus($"ws state={Socket.State}");
        }

        void HandleConnected()
        {
            if (_maintenance) return;
            SetStatus(_everConnected ? "ws reconnected" : "ws connected");
            _everConnected = true;
            SendHello();
            OnWsReady?.Invoke();
        }

        void HandleDisconnected(string reason)
        {
            SetStatus($"ws down: {reason}");
            OnWsDisconnected?.Invoke(reason ?? "closed");
        }

        void SendHello()
        {
            if (Socket == null || Session == null) return;
            Socket.SendText(
                $"{{\"op\":\"hello\",\"proto\":1,\"app\":\"{_boot?.AppVersion}\",\"res\":\"{_boot?.ResVersion}\",\"pid\":{Session.Pid}}}");
        }

        void Update()
        {
            Socket?.Tick();
        }

        void OnDestroy()
        {
            Socket?.Dispose();
            Socket = null;
        }

        void SetStatus(string s)
        {
            Status = s;
            Debug.Log($"[GameNet] {s}");
            OnStatus?.Invoke(s);
        }
    }
}