using System;
using System.IO;
using UnityEngine;

namespace XGame.MiniGame
{
    // PC 本地端到端烟测入口：连接本地 Gateway，再用 MiniGameHost 下载/加载 rps 小游戏。
    // 挂到任意场景对象后 Play；也可以运行时由 AddComponent 创建。
    public sealed class PcMiniGameSmokeLauncher : MonoBehaviour
    {
        public string GatewayUrl = "ws://127.0.0.1:5005/ws?pid=1";
        public string CdnBase = "";
        public string GameId = "rps";
        public int Version = 1;
        public bool AutoStart;

        private string _status = "idle";
        private XWebSocket _socket;
        private MiniGameHost _host;

        private void Start()
        {
            if (AutoStart) StartSmoke();
        }

        private void OnDestroy()
        {
            _socket?.close();
            _socket = null;
        }

        private void OnGUI()
        {
            GUILayout.BeginArea(new Rect(16, 16, 620, 230), GUI.skin.box);
            GUILayout.Label("PC MiniGame Smoke");
            GUILayout.Label("Status: " + _status);
            GUILayout.Label("Gateway URL");
            GatewayUrl = GUILayout.TextField(GatewayUrl);
            GUILayout.Label("CDN Base");
            CdnBase = GUILayout.TextField(string.IsNullOrEmpty(CdnBase) ? DefaultCdnBase() : CdnBase);
            GUILayout.BeginHorizontal();
            GUILayout.Label("Game", GUILayout.Width(48));
            GameId = GUILayout.TextField(GameId, GUILayout.Width(120));
            GUILayout.Label("Version", GUILayout.Width(56));
            int.TryParse(GUILayout.TextField(Version.ToString(), GUILayout.Width(60)), out Version);
            GUILayout.EndHorizontal();
            if (GUILayout.Button("Start Smoke")) StartSmoke();
            GUILayout.Label("Expected: download rps DLLs -> connect -> MatchFound(+AI) -> snapshots -> RoomEnd.");
            GUILayout.EndArea();
        }

        public void StartSmoke()
        {
            string gatewayUrl = WithLocalPid(GatewayUrl);
            _status = "connecting " + gatewayUrl;
            _socket?.close();
            _socket = new XWebSocket();
            _socket.Connect(gatewayUrl, (sock, err) =>
            {
                if (!string.IsNullOrEmpty(err) || sock == null)
                {
                    _status = "connect failed: " + err;
                    Debug.LogError("[PcMiniGameSmoke] " + _status);
                    return;
                }

                _status = "connected, entering " + GameId + " v" + Version;
                Debug.Log("[PcMiniGameSmoke] " + _status);
                _host = gameObject.GetComponent<MiniGameHost>();
                if (_host == null) _host = gameObject.AddComponent<MiniGameHost>();
                _host.EnterGame(ResolvedCdnBase(), GameId, Version, sock);
            });
        }

        private static string WithLocalPid(string gatewayUrl)
        {
            if (string.IsNullOrWhiteSpace(gatewayUrl))
            {
                return gatewayUrl;
            }
            int pid = GetLocalPlayerId();
            int queryStart = gatewayUrl.IndexOf('?');
            if (queryStart < 0)
            {
                return gatewayUrl + "?pid=" + pid;
            }

            string head = gatewayUrl.Substring(0, queryStart);
            string query = gatewayUrl.Substring(queryStart + 1);
            string[] parts = query.Split('&');
            bool replaced = false;
            for (int i = 0; i < parts.Length; i++)
            {
                if (parts[i].StartsWith("pid=", StringComparison.OrdinalIgnoreCase))
                {
                    parts[i] = "pid=" + pid;
                    replaced = true;
                    break;
                }
            }
            return head + "?" + (replaced ? string.Join("&", parts) : query + "&pid=" + pid);
        }

        private static int GetLocalPlayerId()
        {
            const string key = "LocalClientId";
            string id = XData.GetString(key, string.Empty);
            if (string.IsNullOrEmpty(id))
            {
                id = SystemInfo.deviceUniqueIdentifier;
                if (string.IsNullOrEmpty(id) || id == "unsupported")
                {
                    id = Guid.NewGuid().ToString("N");
                }
                XData.SetString(key, id);
                XData.Save();
            }

            unchecked
            {
                uint hash = 2166136261u;
                for (int i = 0; i < id.Length; i++)
                {
                    hash ^= id[i];
                    hash *= 16777619u;
                }
                return (int)(hash % 2000000000u) + 1;
            }
        }

        private string ResolvedCdnBase()
        {
            return string.IsNullOrEmpty(CdnBase) ? DefaultCdnBase() : CdnBase;
        }

        private static string DefaultCdnBase()
        {
            // Editor: <repo>/Client/Assets -> <repo>/CDN/minigame/（由 XWorld/生成小游戏更新 菜单产出）
            var assets = new DirectoryInfo(Application.dataPath);
            var client = assets.Parent;
            var repo = client?.Parent;
            string root = repo != null ? repo.FullName : Directory.GetCurrentDirectory();
            return "file:///" + root.Replace('\\', '/') + "/CDN/minigame/";
        }
    }
}