using TMPro;
using UnityEngine;

namespace AOT.UI
{
    /// <summary>Local JSON-authored loading screen, available before CDN initialization.</summary>
    public sealed class BootPatchView : MonoBehaviour
    {
        TMP_Text _status, _percentage;
        RectTransform _fill;
        CanvasGroup _group;
        float _target, _shown;

        public static BootPatchView Create(BootPatchView prefab)
        {
            if (prefab == null)
            {
                Debug.LogError("[Boot] Loading prefab missing; run BuildBootLoading.Build before exporting.");
                return null;
            }
            var view = Instantiate(prefab);
            DontDestroyOnLoad(view.gameObject);
            return view;
        }

        void Awake()
        {
            _status = transform.Find("LoadingCard/Txt_Status").GetComponent<TMP_Text>();
            _percentage = transform.Find("LoadingCard/Txt_Percentage").GetComponent<TMP_Text>();
            _fill = transform.Find("LoadingCard/ProgressTrack/FillClip").GetComponent<RectTransform>();
            _group = GetComponent<CanvasGroup>();
            SetStatus("正在准备冒险…");
            DrawProgress();
        }

        void Update()
        {
            _shown = Mathf.MoveTowards(_shown, _target, Time.unscaledDeltaTime * .65f);
            DrawProgress();
        }

        void DrawProgress()
        {
            if (_fill != null) _fill.anchorMax = new Vector2(_shown, 1f);
            if (_percentage != null) _percentage.text = Mathf.FloorToInt(_shown * 100f) + "%";
        }

        public void SetStatus(string text)
        {
            if (_status != null) _status.text = text ?? string.Empty;
        }

        public void SetProgress(float normalized01) => _target = Mathf.Max(_target, Mathf.Clamp01(normalized01));

        public void SetError(string message)
        {
            Debug.LogError("[Boot] " + message);
            SetStatus("加载失败，请重新进入游戏");
            if (_status != null) _status.color = new Color(.72f, .22f, .18f);
        }

        public void Hide() => StartCoroutine(FadeOut());

        System.Collections.IEnumerator FadeOut()
        {
            _shown = _target = 1f; DrawProgress();
            yield return new WaitForSecondsRealtime(.12f);
            for (float time = 0; time < .25f; time += Time.unscaledDeltaTime)
            {
                if (_group != null) _group.alpha = 1f - time / .25f;
                yield return null;
            }
            gameObject.SetActive(false);
        }

        public void DestroyUi() => Destroy(gameObject);
    }
}