using System.Collections;
using Logging;
using TMPro;
using UnityEngine;

namespace Base
{

    public class Launcher : MonoBehaviour
    {
        public GameObject loadingUI;
        public Gradient progressBar; // 渐变色条
        public TMP_Text describeText; // 描述文本
        
        public float duration = 0.5f; // 过渡时间
        public float fadeDuration = 2f; // 不透明度渐隐的时间
        private float _currentProgress = 0f; // 当前进度
        
        private Color textColor;


        private readonly string[] _loadingSteps =
        {
            "初始化日志", "正在载入定义", "正在加载图片资源", "正在切割瓦片", "正在加载区分派系",
            "正在加载物品"
        };

        public float Progress
        {
            set
            {
                _currentProgress = value;
                if (value < 0.5f)
                {
                    progressBar.color2 = Color.Lerp(Color.black, Color.white, value * 2);
                }
                else
                {
                    progressBar.color2 = Color.white;
                    progressBar.color1 = Color.Lerp(Color.black, Color.white, (value - 0.5f) * 2);
                }

                progressBar.Refresh();
            }
        }

        public float Opacity
        {
            set
            {
                var alpha = (byte)(value * 255);
                progressBar.color1.a = alpha;
                progressBar.color2.a = alpha;
                describeText.color = value > 0.5f ? Color.Lerp(new Color(1, 1, 1, 0), textColor, (value - 0.5f) * 2) : new Color(1, 1, 1, 0);
                progressBar.Refresh();
            }
        }

        private void Start()
        {
            Base.Setting.Instance.Init();
#if !DEBUG
            duration = Base.Setting.Instance.progressStepDuration;
            fadeDuration = Base.Setting.Instance.exitAnimationDuration;
#endif
            loadingUI.SetActive(true);
            textColor = describeText.color;
            StartCoroutine(LoadAllManagers());
        }

        private IEnumerator LoadAllManagers()
        {
            for (var i = 0; i < _loadingSteps.Length; i++)
            {
                // 更新描述文本
                describeText.text = _loadingSteps[i];

                // 获取当前阶段的目标进度
                var targetProgress = (float)(i + 1) / _loadingSteps.Length;

                // 平滑过渡到下一个阶段
                yield return SmoothTransitionTo(targetProgress);

                // 初始化对应的管理器
                switch (i)
                {
                    case 0:
                        UnityLogger.Init();
                        break;
                    case 1:
                        Managers.DefineManager.Instance.Init();
                        break;
                    case 2:
                        Managers.PackagesImageManager.Instance.Init();
                        break;
                    case 3:
                        Managers.TileManager.Instance.Init();
                        break;
                    case 4:
                        Managers.AffiliationManager.Instance.Init();
                        break;
                    case 5:
                        Managers.ItemResourceManager.Instance.Init();
                        break;
                }
            }

            // 加载完成后的处理
            describeText.text = "加载完成！";
            Progress = 1f;

            // 开始渐隐效果
            yield return FadeOutProgressBar();
        }

        private IEnumerator SmoothTransitionTo(float targetProgress)
        {
            var startProgress = _currentProgress;
            var elapsedTime = 0f;

            while (elapsedTime < duration)
            {
                elapsedTime += Time.deltaTime;
                var t = Mathf.SmoothStep(0f, 1f, elapsedTime / duration); // 使用 SmoothStep 实现平滑过渡
                Progress = Mathf.Lerp(startProgress, targetProgress, t);
                yield return null;
            }

            // 确保最终进度达到目标值
            Progress = targetProgress;
        }

        private IEnumerator FadeOutProgressBar()
        {
            var elapsedTime = 0f;

            while (elapsedTime < fadeDuration)
            {
                elapsedTime += Time.deltaTime;
                var t = Mathf.SmoothStep(0f, 1f, elapsedTime / fadeDuration); // 使用 SmoothStep 实现平滑渐隐
                Opacity = 1f - t; // 不透明度从 1 到 0
                yield return null;
            }

            // 确保最终不透明度为 0
            Opacity = 0f;
            loadingUI.SetActive(false);
        }
    }
}