using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TargetShooter : MonoBehaviour
{
    private List<GameObject> targets = new List<GameObject>();
    private AudioSource audioSource;
    private Quaternion originalRotation;   // 原本的旋轉角度

    public float shootInterval = 1f;       // 射擊間隔
    public float rotationSpeed = 300f;     // 旋轉速度
    public AudioClip shootSound;           // 射擊音效
    public GameObject explosionEffect;     // 爆炸效果
    

    void Start()
    {
        audioSource = gameObject.AddComponent<AudioSource>();
        originalRotation = transform.rotation;                  // 儲存原本旋轉角度
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            targets.Clear();
            GameObject[] foundTargets = GameObject.FindGameObjectsWithTag("Target");   // 找到所有具有 Target 標籤的物件
            targets.AddRange(foundTargets);
            StartCoroutine(ShootTargets());
        }
    }

    private IEnumerator ShootTargets()
    {
        while (targets.Count > 0)
        {
            // 隨機選擇一個目標
            int randomIndex = Random.Range(0, targets.Count);
            GameObject target = targets[randomIndex];

            // 設定旋轉方向
            Vector3 targetPosition = target.transform.position;
            Vector3 direction = targetPosition - transform.position;

            // 逐漸旋轉到目標
            Quaternion targetRotation = Quaternion.LookRotation(direction);
            float timeElapsed = 0f;
            float rotationDuration = 1f; // 旋轉持續時間

            while (timeElapsed < rotationDuration)
            {
                // 平滑旋轉
                transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, rotationSpeed * Time.deltaTime);
                timeElapsed += Time.deltaTime;
                yield return null;               // 等待下一幀
            }

            Ray ray = new Ray(transform.position, direction);   // 發射射線
            RaycastHit hit;

            if (Physics.Raycast(ray, out hit))
            {
                if (hit.collider.CompareTag("Target"))
                {
                    // 播放音效
                    audioSource.PlayOneShot(shootSound);

                    // 顯示射線
                    Debug.DrawLine(ray.origin, hit.point, Color.red, 1f);

                    // 生成爆炸效果
                    Instantiate(explosionEffect, hit.point, Quaternion.identity);

                    // 移除目標物件
                    Destroy(target);
                    targets.RemoveAt(randomIndex);
                }
            }

            yield return new WaitForSeconds(shootInterval);   // 等待一段時間
        }

        Debug.Log("全部擊中");   // 所有目標都被擊中後顯示訊息

        float returnTimeElapsed = 0f;  // 轉回原本的角度
        float returnDuration = 1f;     // 返回持續時間

        while (returnTimeElapsed < returnDuration)
        {
            // 平滑旋轉回原本的角度
            transform.rotation = Quaternion.RotateTowards(transform.rotation, originalRotation, rotationSpeed * Time.deltaTime);
            returnTimeElapsed += Time.deltaTime;
            yield return null; // 等待下一幀
        }

        targets.Clear();   // 清空陣列內容
    }
}