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

namespace AOT.Boot
{
    /// <summary>
    /// 壳层启动入口：版本检查 → 资源补丁 → HybridCLR/热更入口。
    /// </summary>
    public sealed class BootDriver : MonoBehaviour
    {
        [SerializeField] BootSettings settings = new BootSettings();

        BootPatchView _view;

        void Awake()
        {
            Application.targetFrameRate = 60;
            Screen.sleepTimeout = SleepTimeout.NeverSleep;
            DontDestroyOnLoad(gameObject);

            if (Screen.orientation != ScreenOrientation.Portrait)
                Screen.orientation = ScreenOrientation.Portrait;
        }

        void Start()
        {
            _view = BootPatchView.Create();
            StartCoroutine(Bootstrap());
        }

        System.Collections.IEnumerator Bootstrap()
        {
            BootContext ctx = null;
            string error = null;

            var runner = new PatchRunner(this, settings, _view);
            yield return runner.Run((c, e) =>
            {
                ctx = c;
                error = e;
            });

            if (!string.IsNullOrEmpty(error) || ctx == null)
            {
                _view?.SetError(error ?? "启动失败");
                Debug.LogError($"[Boot] {error}");
                yield break;
            }

            _view?.SetStatus("加载热更代码…");
            _view?.SetProgress(0.97f);

            string loadError = null;
            yield return HotUpdateLoader.LoadAndStart(ctx, settings, e => loadError = e);

            if (!string.IsNullOrEmpty(loadError))
            {
                _view?.SetError(loadError);
                Debug.LogError($"[Boot] {loadError}");
                yield break;
            }

            _view?.SetProgress(1f);
            _view?.SetStatus("热更已启动");
            Debug.Log($"[Boot] OK app={ctx.AppVersion} res={ctx.ResVersion} pack={ctx.PackVersion} cdn={ctx.CdnRoot}");

            // Prefabs/atlases load asynchronously; two frames are not a readiness guarantee.
            _view?.SetStatus("加载主界面…");
            float uiDeadline = Time.realtimeSinceStartup + 120f;
            while (!ctx.MainUiReady && string.IsNullOrEmpty(ctx.MainUiError) && Time.realtimeSinceStartup < uiDeadline)
                yield return null;
            if (!ctx.MainUiReady)
            {
                string uiError = ctx.MainUiError ?? "主界面加载超时，请检查 Art 资源包后重试";
                _view?.SetError(uiError);
                Debug.LogError("[Boot] " + uiError);
                yield break;
            }
            yield return null;
            _view?.Hide();
        }
    }
}