using System.Collections;
using UnityEngine;
using UnityEngine.Events;

[RequireComponent(typeof(BoxCollider))]
public class CameraShake : MonoBehaviour
{
    [Header("Camera Settings")]
    public bool useMainCamera = true;
    public bool useTaggedCamera = false;
    public string taggedCameraName = "YourTaggedCameraTag";
    public bool playOnce = false;

    [Header("Shake Settings")]
    public AnimationCurve intensityCurve = AnimationCurve.Linear(0, 1, 1, 1);
    public float durationSpeed = 1.0f;
    public float duration = 1.0f;

    [Header("Audio Settings")]
    public AudioClip shakeAudioClip;

    [Header("Events")]
    public UnityEvent onShakeStart;
    public UnityEvent onShakeEnd;
    public UnityEvent onEnter;
    public UnityEvent onExit;

    public float endShakeDelay = 0.0f;

    private Camera mainCamera;
    private bool isShaking = false;
    private BoxCollider boxCollider;
    private bool hasTriggered = false;

    [Header("Collision Settings")]
    public float delay = 0f;
    public bool useTagFilter = false;
    public string targetTag;
    public bool triggerOnlyOnce = false;

    private void Start()
    {
        if (useMainCamera)
            mainCamera = Camera.main;
        else if (useTaggedCamera)
            mainCamera = GameObject.FindGameObjectWithTag(taggedCameraName)?.GetComponent<Camera>();

        if (mainCamera == null)
        {
            Debug.LogError("No camera found. Please assign or tag a camera.");
            return;
        }

        boxCollider = GetComponent<BoxCollider>();
        if (boxCollider == null)
        {
            Debug.LogError("No BoxCollider found. Please attach a BoxCollider component to the GameObject.");
            return;
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        if (triggerOnlyOnce && hasTriggered)
            return;

        if (useTagFilter && !other.CompareTag(targetTag))
        {
            Debug.Log("Collision with object with different tag.");
            return;
        }

        hasTriggered = true;

        if (other.CompareTag("Player"))
        {
            onEnter.Invoke();

            if (!isShaking)
            {
                onShakeStart.Invoke();
                StartCoroutine(ShakeCamera());
            }
        }

        StartCoroutine(InvokeEventWithDelay());
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.CompareTag("Player"))
        {
            onExit.Invoke();
        }
    }

    private IEnumerator InvokeEventWithDelay()
    {
        yield return new WaitForSeconds(delay);

        if (onShakeStart != null)
        {
            Debug.Log("Event is being invoked.");
            onShakeStart.Invoke();
        }
        else
        {
            Debug.LogWarning("OnShakeStart is not assigned.");
        }
    }

    private IEnumerator ShakeCamera()
    {
        isShaking = true;

        if (shakeAudioClip != null)
            AudioSource.PlayClipAtPoint(shakeAudioClip, mainCamera.transform.position);

        float startTime = Time.time;
        do
        {
            float elapsed = Time.time - startTime;
            float progress = Mathf.Clamp01(elapsed / duration);

            float intensity = intensityCurve.Evaluate(progress);
            Vector3 offset = Random.insideUnitSphere * intensity;

            mainCamera.transform.localPosition = offset;

            yield return null;
        } while (Time.time - startTime < duration);

        yield return new WaitForSeconds(endShakeDelay);

        isShaking = false;

        mainCamera.transform.localPosition = Vector3.zero;

        onShakeEnd.Invoke();

        if (playOnce)
            Destroy(this);
    }

    // Public method to start camera shake from other scripts
    public void StartCameraShake()
    {
        if (!isShaking)
        {
            onShakeStart.Invoke();
            StartCoroutine(ShakeCamera());
        }
    }
}