using UnityEngine;
using System.Collections;
using TMPro;

public class ChestFlyController : MonoBehaviour
{
    public static ChestFlyController Instance;

    [Header("飞走动画时长")]
    public float flyDuration = 1.5f;

    [Header("文字设置")]
    public TMP_Text flyText;          // 关联文字
    public float textFadeInTime = 0.5f; // 淡入时间
    public float textShowTime = 1.5f;   // 显示时长

    private Animator animator;
    private CanvasGroup canvasGroup;
    private BoatController boat;

    void Awake()
    {
        Instance = this;
        animator = GetComponentInChildren
            <Animator>();
        canvasGroup = GetComponent<CanvasGroup>();

        canvasGroup.alpha = 0;
        canvasGroup.blocksRaycasts = false;
        gameObject.SetActive(false);

        // 初始隐藏文字
        if (flyText != null)
        {
            Color c = flyText.color;
            c.a = 0;
            flyText.color = c;
        }
    }

    public void PlayFlyAnimation(
        BoatController boatRef)
    {
        boat = boatRef;
        gameObject.SetActive(true);
        StartCoroutine(ShowFly());
    }

    IEnumerator ShowFly()
    {
        // 暂停敌人
        GameManager.Instance.PauseEnemies();

        // 背景淡入
        canvasGroup.blocksRaycasts = true;
        float t = 0;
        while (t < 1f)
        {
            t += Time.deltaTime * 3f;
            canvasGroup.alpha = t;
            yield return null;
        }
        canvasGroup.alpha = 1f;

        // 等待飞走动画播放完
        yield return new WaitForSeconds(flyDuration);

        // 飞走动画结束后显示文字
        yield return StartCoroutine(ShowFlyText());

        StartCoroutine(HideFly());
    }

    IEnumerator ShowFlyText()
    {
        if (flyText == null) yield break;

        // 文字淡入
        float t = 0;
        while (t < 1f)
        {
            t += Time.deltaTime /
                textFadeInTime;
            Color c = flyText.color;
            c.a = Mathf.Clamp01(t);
            flyText.color = c;
            yield return null;
        }

        // 显示一段时间
        yield return new WaitForSeconds(
            textShowTime
        );

        // 文字淡出
        t = 1f;
        while (t > 0)
        {
            t -= Time.deltaTime /
                textFadeInTime;
            Color c = flyText.color;
            c.a = Mathf.Clamp01(t);
            flyText.color = c;
            yield return null;
        }
    }

    IEnumerator HideFly()
    {
        float t = 1f;
        while (t > 0)
        {
            t -= Time.deltaTime * 3f;
            canvasGroup.alpha = t;
            yield return null;
        }
        canvasGroup.alpha = 0;
        canvasGroup.blocksRaycasts = false;

        // 重置文字透明度
        if (flyText != null)
        {
            Color c = flyText.color;
            c.a = 0;
            flyText.color = c;
        }

        gameObject.SetActive(false);

        // 恢复敌人
        GameManager.Instance.ResumeEnemies();

        // 恢复小船
        if (boat != null)
            boat.ResumeAfterAnimation();
    }
}