using System;
using System.Collections;
using System.Collections.Generic;
using DG.Tweening;
using DragonLi.Core;
using UnityEngine;
using Random = UnityEngine.Random;

public enum EggBulletType
{
    EnemyType,
    PlayerType,
}

public class EggBullet : MonoBehaviour
{
    public EggBulletType type;

    public bool isDie;
    public bool isStop;
    private Transform _enemyTran;
    private Transform _playerTran;
    
    public enum FlyMode { Straight=1, Bouncing=2, CurvedFromSide=3 }
    [Header("Common Settings")]
    public FlyMode flyMode = FlyMode.Straight;
    public Vector3 target;
    private float speed = 3f;
    private float speed2 = 1.5f;
    private float speed3 = 0.5f;
    private float arrivalThreshold = 0.1f; // 到达目标的容差

    [Header("Bouncing Mode Settings")]
    private int bounceCount = 2;       // 弹跳次数
    private float bounceHeight = 1.5f;   // 弹跳高度

    [Header("Curved Mode Settings")]
    private float sideOffset = 1;     // 起始侧向偏移
    private float curveHeight = 0.5f;    // 弧线高度
    public bool startFromLeft = true; // 从左侧还是右侧

    private Vector3 startPos;
    private Vector3 endPos;
    private float startTime;
    private float journeyLength;
    
    public void Init()
    {
        type = EggBulletType.EnemyType;
        isDie = false;
        int id = Random.Range(1, 4);
        flyMode = (FlyMode)id;
        _enemyTran = GameManager.Ins.enemy.body;
        _playerTran = GameLocal.Ins.self.transform;
        float targetX = Random.Range(-1f,2);
        Vector3 curTarget=_playerTran.position+new Vector3(targetX,0,0);
        Launch(curTarget);
    }

    public void ChangeType(EggBulletType curType)
    {
        type = curType;
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.tag == "Skillet"&& type == EggBulletType.EnemyType)
        {
            ChangeType(EggBulletType.PlayerType);
            flyMode=FlyMode.Straight;
            speed = 6f;
            Launch(_enemyTran.position);
            GameManager.Ins.playerRightHand.ShowSkilletEx();
        }
        
    }

    public void Hit()
    {
        isDie = true;
        Destroy(gameObject);
    }

    // 发射方法
    public void Launch( Vector3 targetTransform)
    {
        target = targetTransform;
        startPos = transform.position;
        _vector3Start = GameManager.Ins.enemy.hand.position;
        if (flyMode == FlyMode.CurvedFromSide)
        {
            // 计算侧向起点
            Vector3 dirToTarget = (target - transform.position).normalized;
            Vector3 sideDir = startFromLeft ? -Vector3.Cross(dirToTarget, Vector3.up) : Vector3.Cross(dirToTarget, Vector3.up);
            startPos = target + sideDir * sideOffset;
            transform.position = startPos;
        }
        endPos = target;
        startTime = Time.time;
        journeyLength = Vector3.Distance(startPos, endPos);
    }

    private void Update()
    {
        float distToEndPos = Vector3.Distance(transform.position.ReflectVectorXOZ(), endPos.ReflectVectorXOZ());
        float disToTarget= Vector3.Distance(transform.position.ReflectVectorXOZ(), target.ReflectVectorXOZ());
        if (disToTarget <= arrivalThreshold)
        {
            if (type == EggBulletType.PlayerType)
            {
                GameManager.Ins.EnemyHit(transform.position);
            }
            int index= Random.Range(0, 2);
            if (type == EggBulletType.EnemyType&&index==0)
            {
                GameManager.Ins.PlayerHit();
            }
            Hit();
            return;
        }
        if (distToEndPos <= arrivalThreshold&& type== EggBulletType.EnemyType)
        {
            // 到达目标，停止或销毁
            OnArrival();
            return;
        }

        switch (flyMode)
        {
            case FlyMode.Straight:
                FlyStraight();
                break;
            case FlyMode.Bouncing:
                FlyBouncing();
                break;
            case FlyMode.CurvedFromSide:
                FlyCurved();
                break;
        }
    }
    

    void FlyStraight()
    {
        float frac = (Time.time - startTime) * speed / journeyLength;
        transform.position = Vector3.Lerp(startPos, endPos, frac);
    }

    void FlyBouncing()
    {
        // 总共分成：1 段下落 + bounceCount 段弹跳
        int segments = bounceCount + 1;
        float frac = (Time.time - startTime) * speed2 / journeyLength;
        frac = Mathf.Clamp01(frac);

        // 水平线性插值
        Vector3 horizontalPos = Vector3.Lerp(startPos, endPos, frac);

        // 计算当前处于哪个“段”和在该段内的进度 t（0~1）
        float segmentLength = 1f / segments;
        int segIndex = Mathf.Min((int)(frac / segmentLength), segments - 1);
        float t = (frac - segIndex * segmentLength) / segmentLength;

        float y;
        if (segIndex == 0)
        {
            // 初始下落：用半个余弦曲线 y = startY * cos(t * PI/2)
            y = startPos.y * Mathf.Cos(t * (Mathf.PI / 2));
        }
        else
        {
            // 弹跳段：用正弦波 y = sin(t * PI) * bounceHeight
            y = Mathf.Sin(t * Mathf.PI) * bounceHeight;
        }

        // 最终位置
        transform.position = new Vector3(horizontalPos.x,
            y,
            horizontalPos.z);
    }

    private Vector3 _vector3Start;
    void FlyCurved()
    {
        // 进度 0→1
        float frac = (Time.time - startTime) * speed3 / journeyLength;
        frac = Mathf.Clamp01(frac);

        // 起点和终点
        Vector3 P0 = _vector3Start;
        Vector3 P2 = endPos;

        // 计算侧向方向（和水平面法线叉乘）
        Vector3 dir = (P2 - P0).normalized;
        Vector3 sideDir = startFromLeft 
            ? -Vector3.Cross(dir, Vector3.up) 
            :  Vector3.Cross(dir, Vector3.up);

        // 控制点：在中点向侧面偏移，并抬高 curveHeight
        Vector3 mid = Vector3.Lerp(P0, P2, 0.5f);
        Vector3 P1 = mid + sideDir * sideOffset + Vector3.up * curveHeight;

        // 二次贝塞尔公式 B(t) = (1−t)²P0 + 2(1−t)tP1 + t²P2
        float u = 1 - frac;
        Vector3 pos = u*u * P0 
                      + 2*u*frac * P1 
                      + frac*frac * P2;

        transform.position = pos;
    }

    // 到达目标的回调，可扩展
    protected virtual void OnArrival()
    {
        // 例如：爆炸、伤害、销毁等
        //Destroy(gameObject);
        Debug.Log("删除鸡蛋");
        if(!isDie) 
            Destroy(gameObject);
    }
}