ActionTowerDefense/ActionTowerDefense/Assets/Scripts/Boss/WaterGhost/BlackUmbrella.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;
using UnityEngine.Events;

public class BlackUmbrella : MonoBehaviour
{
    public enum UmbrellaState
    {
        none,
        appear,     //出现，原地动画
        sprint,     //飞出去
        stay,       //停在目标点
        back,       //收回
        disappear,  //消失前原地动画
    }

    [DisplayOnly]
    public UmbrellaState umbrellaState;     //当前黑伞的状态
    [HideInInspector]
    public Transform umbrellaOrigPos;
    private Vector3 origPos;
    [HideInInspector]
    public Transform umbrellaBackPos;

    public Transform owner;
    WaterSprite ws;

    private Animator ani;
    private WaterSpriteAttackController attackCon;

    //玩家
    private PlayerController pc;

    //黑伞的目标坐标
    public float farFromPlayerDis;
    private Vector3 aimPos;
    private float attackDis;

    //黑伞攻击次数
    public int minTime, maxTime;
    private int allTime;

    //黑伞的攻击
    private float umbrePastTime;
    [LabelText("黑伞初速度")]
    public float initialSpeed;
    [LabelText("黑伞出现时长")]
    public float appearTime;
    [LabelText("黑伞停留时长")]
    public float stayTime;
    [LabelText("黑伞收回时长")]
    public float backTime;
    private bool hasBackAni;
    [LabelText("黑伞消失时长")]
    public float disappearTime;
    [LabelText("黑伞位置提示特效")]
    public GameObject effect;
    private GameObject effectIns;
    private SpriteRenderer effectInsSr;
    public float initialTransparency = 0.5f;
    //提示X坐标
    public float leftX, rightX;

    //是第一次攻击，则无需索敌
    private bool isFirst;
    public UnityAction OnBack;

    public float leftBoundary, rightBoundary;

    private void Start()
    {
        if (ani == null)
        {
            ani = GetComponent<Animator>();
            ws = owner.GetComponent<WaterSprite>();
            GetComponentInChildren<AttackTrigger>().owner = ws;
            attackCon = owner.GetComponent<WaterSpriteAttackController>();
            pc = PlayersInput.instance[0];
        }
    }

    //放出这个攻击！
    public void Release()
    {
        allTime = Random.Range(minTime, maxTime);
        isFirst = true;
        ChangeUmbrellaState(UmbrellaState.appear);
    }

    public void ChangeUmbrellaState(UmbrellaState us)
    {
        if (umbrellaState == us)
        {
            return;
        }
        umbrellaState = us;
        switch (us)
        {
            case UmbrellaState.appear:
                transform.position = umbrellaOrigPos.position;
                gameObject.SetActive(true);
                break;
            case UmbrellaState.sprint:
                origPos = transform.position;
                aimPos = pc.transform.position;
                if (isFirst && aimPos.x < transform.position.x)
                {
                    aimPos = transform.position + new Vector3(1, 0, 0) * farFromPlayerDis;
                    attackDis = farFromPlayerDis;
                    isFirst = false;
                }
                else
                {
                    aimPos.y = origPos.y;
                    int fx = 1;
                    if (aimPos.x < origPos.x)
                    {
                        fx = -1;
                    }
                    aimPos.x += farFromPlayerDis * fx;
                    attackDis = Mathf.Abs(aimPos.x - transform.position.x);
                }
                if (aimPos.x > rightBoundary)
                {
                    aimPos.x = rightBoundary;
                }
                else if (aimPos.x < leftBoundary)
                {
                    aimPos.x = leftBoundary;
                }
                break;
            case UmbrellaState.stay:
                aimPos.y = pc.bodyTrans.position.y;
                break;
            case UmbrellaState.back:
                OnBack?.Invoke();
                break;
            case UmbrellaState.disappear:
                break;
        }
    }

    private void OnUmbrellaState()
    {
        umbrePastTime += Time.deltaTime;
        switch (umbrellaState)
        {
            case UmbrellaState.appear:
                if (umbrePastTime >= appearTime)
                {
                    umbrePastTime = 0;
                    ChangeUmbrellaState(UmbrellaState.sprint);
                }
                break;
            case UmbrellaState.sprint:
                float distanceCovered = umbrePastTime * initialSpeed;
                float fraction = distanceCovered / attackDis;
                float dec = 1 - (1 - fraction) * (1 - fraction);
                transform.position = Vector3.Lerp(origPos, aimPos, dec);
                if (Mathf.Abs(transform.position.x - aimPos.x) <= 0.2f)
                {
                    transform.position = aimPos;
                    umbrePastTime = 0;
                    ChangeUmbrellaState(UmbrellaState.stay);
                }
                break;
            case UmbrellaState.stay:
                aimPos.y = pc.bodyTrans.position.y;
                transform.position = Vector3.MoveTowards(transform.position, aimPos, 9f * Time.deltaTime);
                if (umbrePastTime >= stayTime)
                {
                    transform.position = aimPos;
                    umbrePastTime = 0;
                    allTime--;
                    if (allTime > 0)
                    {
                        ChangeUmbrellaState(UmbrellaState.sprint);
                    }
                    else
                    {
                        ChangeUmbrellaState(UmbrellaState.back);
                    }
                }
                break;
            case UmbrellaState.back:
                //float t2 = Mathf.Clamp01(umbrePastTime / backTime);
                //float smoothT2 = Mathf.SmoothStep(0, 1, t2);
                //transform.position = Vector3.Lerp(aimPos, umbrellaBackPos.position, smoothT2);
                //if (umbrePastTime >= backTime)
                //{
                //    umbrePastTime = 0;
                //    hasBackAni = false;
                //    ws.isHoldingUmbre = true;
                //    ChangeUmbrellaState(UmbrellaState.disappear);
                //}
                //else if (!hasBackAni && umbrePastTime >= backTime - 0.6f)
                //{
                //    hasBackAni = true;
                //    attackCon.isUmbrellaBack = true;
                //    ws.isHoldingUmbre = true;
                //}
                break;
            case UmbrellaState.disappear:
                if (umbrePastTime >= disappearTime)
                {
                    umbrePastTime = 0;
                    ChangeUmbrellaState(UmbrellaState.none);
                    gameObject.SetActive(false);
                }
                break;
        }
    }

    public void BeTaken()
    {
        StartCoroutine(Disappear());
    }

    IEnumerator Disappear()
    {
        yield return new WaitForSeconds(0.6f);
        umbrePastTime = 0;
        attackCon.isUmbrellaBack = true;
        ws.isHoldingUmbre = true;
        ChangeUmbrellaState(UmbrellaState.disappear);
    }
    private bool IsTargetVisible(GameObject target)
    {
        Camera camera = Camera.main;
        // 获取物体在视口中的位置（归一化坐标）
        Vector3 viewportPoint = camera.WorldToViewportPoint(target.transform.position);

        // 检查坐标是否在屏幕范围内（0-1之间）
        bool inCameraView = viewportPoint.x >= 0 && viewportPoint.x <= 1 &&
                           viewportPoint.y >= 0 && viewportPoint.y <= 1 &&
                           viewportPoint.z > 0; // z>0 表示在相机前方

        return inCameraView;
    }

    private void ShowTip()
    {
        if (!effectIns)
        {
            effectIns = PoolManager.Instantiate(effect, Camera.main.transform);
            effectIns.GetComponent<Bullet>().owner = ws;
            effectInsSr = effectIns.GetComponentInChildren<SpriteRenderer>();

            // 初始化透明度为半透明（假设原本是0.5）
            var color = effectInsSr.color;
            color.a = initialTransparency;
            effectInsSr.color = color;
        }

        bool isAboutToAttack = umbrellaState == UmbrellaState.stay
                       && allTime > 0
                       && (stayTime - umbrePastTime) <= 1f;

        if (!IsTargetVisible(gameObject))
        {
            if (isAboutToAttack)
            {
                // 剩余时间在0-1秒之间，计算透明度（0.5 -> 1.0）
                float remainingTime = stayTime - umbrePastTime;
                float alpha = Mathf.Lerp(1.0f, initialTransparency, remainingTime); // 时间越少透明度越高
                var color = effectInsSr.color;
                color.a = alpha;
                effectInsSr.color = color;
            }
            else
            {
                // 非攻击状态保持半透明
                var color = effectInsSr.color;
                if (color.a != initialTransparency)
                {
                    color.a = initialTransparency;
                    effectInsSr.color = color;
                }
            }

            if (gameObject.transform.position.x > pc.transform.position.x)
            {
                effectIns.transform.localPosition = new Vector3(rightX, 0, 16);
                Vector3 pos = effectIns.transform.position;
                pos.y = gameObject.transform.position.y;
                effectIns.transform.position = pos;
                effectIns.transform.localEulerAngles = new Vector3(0.8f, 0.1f, 1);
            }
            else
            {
                effectIns.transform.localPosition = new Vector3(leftX, 0, 16);
                Vector3 pos = effectIns.transform.position;
                pos.y = gameObject.transform.position.y;
                effectIns.transform.position = pos;
                effectIns.transform.localEulerAngles = new Vector3(-0.8f, 0.1f, 1);
            }
            effectIns.SetActive(true);
        }
        else
        {
            effectIns.SetActive(false);
            // 重置透明度为半透明，避免下次显示时状态错误
            var color = effectInsSr.color;
            if (color.a != initialTransparency)
            {
                color.a = initialTransparency;
                effectInsSr.color = color;
            }

            effectIns.SetActive(false);
        }
    }

    private void Update()
    {
        OnUmbrellaState();
        ShowTip();
    }
}