using AOT.Boot;
using HotUpdate.Net;
using HotUpdate.UI;
using UnityEngine;

namespace HotUpdate.Gameplay
{
    /// <summary>
    /// M4 玩法骨架：挂 HUD、角色、网络状态；处理公告与断线重连提示。
    /// </summary>
    public sealed class GameplayBootstrap : MonoBehaviour
    {
        BootContext _ctx;
        GameNet _net;
        MainHudView _hud;
        ConfirmDialogView _dialog;
        bool _maintenanceLock;

        public void Bind(BootContext ctx, GameNet net)
        {
            _ctx = ctx;
            _net = net;
        }

        void Start()
        {
            EnsureUi();
            WireNet();
            MaybeShowBootNotice();

            var spawner = gameObject.AddComponent<CharacterSpawner>();
            spawner.Bind(_ctx);
            spawner.Spawn();
        }

        void EnsureUi()
        {
            var uiRoot = new GameObject("UiRoot");
            DontDestroyOnLoad(uiRoot);
            var mgr = uiRoot.AddComponent<UiManager>();
            mgr.Init(uiRoot.transform, new UiPrefabLoader());

            var hudGo = mgr.Open(MainHudView.PrefabName);
            _hud = hudGo != null ? hudGo.GetComponent<MainHudView>() : null;
            if (_hud == null && hudGo != null)
                _hud = hudGo.AddComponent<MainHudView>();
            _hud?.Bind();
            _hud?.SetStatus("启动中…");
            if (_hud != null)
                _hud.OnReconnectClicked += () => _net?.RequestReconnect();

            var dlgGo = mgr.Open(ConfirmDialogView.PrefabName);
            if (dlgGo != null)
            {
                dlgGo.SetActive(false);
                _dialog = dlgGo.GetComponent<ConfirmDialogView>();
                if (_dialog == null) _dialog = dlgGo.AddComponent<ConfirmDialogView>();
                _dialog.Bind();
            }
        }

        void WireNet()
        {
            if (_net == null) return;
            _net.OnStatus += s => _hud?.SetStatus(s);
            _net.OnAuthed += session => _hud?.SetPid(session != null ? session.Pid : 0);
            _net.OnWsReady += () =>
            {
                if (_maintenanceLock) return;
                _hud?.ShowReconnect(false);
                _hud?.SetStatus("已连接");
            };
            _net.OnWsDisconnected += reason =>
            {
                if (_maintenanceLock) return;
                _hud?.ShowReconnect(true, $"网络已断开（{reason}），正在重连…");
            };
            _net.OnReconnecting += attempt =>
            {
                if (_maintenanceLock) return;
                _hud?.ShowReconnect(true, $"正在重连…（第 {attempt} 次）");
            };
            _net.OnMaintenance += msg =>
            {
                _maintenanceLock = true;
                _hud?.ShowReconnect(false);
                _hud?.SetStatus("服务器维护中");
                _dialog?.Show("维护公告", string.IsNullOrEmpty(msg) ? "服务器维护中，请稍后再试。" : msg);
            };
            _net.OnWsMessage += TryHandleProtocol;
        }

        void MaybeShowBootNotice()
        {
            if (_ctx == null || string.IsNullOrEmpty(_ctx.Notice)) return;
            _dialog?.Show("公告", _ctx.Notice);
        }

        void TryHandleProtocol(string json)
        {
            if (string.IsNullOrEmpty(json)) return;
            // 轻量解析，避免引入完整 JSON 库依赖
            if (json.IndexOf("\"op\":\"maintenance\"", System.StringComparison.Ordinal) >= 0 ||
                json.IndexOf("\"op\": \"maintenance\"", System.StringComparison.Ordinal) >= 0)
            {
                var msg = ExtractJsonString(json, "message");
                _net?.NotifyMaintenance(msg);
            }
        }

        static string ExtractJsonString(string json, string key)
        {
            var token = $"\"{key}\"";
            var i = json.IndexOf(token, System.StringComparison.Ordinal);
            if (i < 0) return null;
            i = json.IndexOf(':', i);
            if (i < 0) return null;
            i = json.IndexOf('"', i + 1);
            if (i < 0) return null;
            var j = json.IndexOf('"', i + 1);
            if (j < 0) return null;
            return json.Substring(i + 1, j - i - 1);
        }
    }
}