using UnityEngine;
using System.Collections;
using DG.Tweening;
using UnityEngine.UI;

namespace AibisDream.UI
{
    public class TimeTurner : MonoBehaviour
    {
        [Header("索引")]
        [SerializeField] private Animator targetAnimator;
        [SerializeField] private Animator originAnimator;
        [SerializeField] private CanvasGroup canvasGroup;

        [Header("参数")]
        [SerializeField] private float fadeTime = 2f;
        [SerializeField] private float holdTime = 1f;
        [SerializeField] private float inoutTime = 0.5f;

        private int _runVersion;

        public void ForceStop()
        {
            _runVersion++;
            ResetVisuals();
        }

        public IEnumerator TurnTimeTo(string originState, string targetState)
        {
            var version = ++_runVersion;
            var originImage = originAnimator.GetComponent<Image>();

            // 设置起始状态
            targetAnimator.gameObject.SetActive(true);
            originAnimator.gameObject.SetActive(true);

            float originParam = StateToParam(originState);
            float targetParam = StateToParam(targetState);

            targetAnimator.SetFloat("TimeState", targetParam);
            originAnimator.SetFloat("TimeState", originParam);

            canvasGroup.alpha = 0;
            originImage.color = Color.white;

            // 淡入
            yield return canvasGroup.DOFade(1, inoutTime).WaitForCompletion();
            if (version != _runVersion) yield break;

            // 等待静止时间
            yield return new WaitForSeconds(holdTime);
            if (version != _runVersion) yield break;

            // 淡出起始状态
            yield return originImage.DOFade(0, fadeTime).WaitForCompletion();
            if (version != _runVersion) yield break;

            // 等待静止时间
            yield return new WaitForSeconds(holdTime);
            if (version != _runVersion) yield break;

            // 淡出
            yield return canvasGroup.DOFade(0, inoutTime).WaitForCompletion();
            if (version != _runVersion) yield break;

            ResetVisuals();
        }

        private void ResetVisuals()
        {
            canvasGroup.DOKill();
            originAnimator.GetComponent<Image>().DOKill();

            canvasGroup.alpha = 0;
            originAnimator.GetComponent<Image>().color = Color.white;

            targetAnimator.gameObject.SetActive(false);
            originAnimator.gameObject.SetActive(false);
        }

        private float StateToParam(string stateName)
        {
            switch (stateName.ToLower())
            {
                case "morning":
                    return 0;
                case "day":
                    return 0.33f;
                case "evening":
                    return 0.66f;
                case "night":
                    return 1;
                default:
                    throw new System.Exception($"Invalid state name: {stateName}");
            }
        }
    }
}