using System.Collections;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class GeppettoRunTriggerZone : MonoBehaviour
{
    [Header("Trigger")]
    public string playerTag = "Player";

    [Header("Geppetto")]
    public Transform geppetto;
    public Animator geppettoAnimator;
    public string runBoolName = "isRunning";

    [Header("Move")]
    public float runSpeed = 5f;
    public float rotateSpeed = 8f;
    public float fadeDistance = 2f;

    [Header("Fade")]
    public Image blackFadeImage;
    public float fadeDuration = 1f;

    [Header("Scene")]
    public string nextSceneName;

    private Transform targetPlayer;
    private bool started = false;
    private bool fading = false;

    private void Start()
    {
        if (blackFadeImage != null)
        {
            blackFadeImage.gameObject.SetActive(true);

            Color c = blackFadeImage.color;
            c.a = 0f;
            blackFadeImage.color = c;
        }

        if (geppettoAnimator != null && !string.IsNullOrEmpty(runBoolName))
        {
            geppettoAnimator.SetBool(runBoolName, false);
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        if (started)
            return;

        if (!IsPlayer(other))
            return;

        Debug.Log("Á¦ÆäÅä À̺¥Æ® ±¸¿ª ÁøÀÔ: " + other.name);

        targetPlayer = other.transform;
        started = true;

        if (geppettoAnimator != null && !string.IsNullOrEmpty(runBoolName))
        {
            geppettoAnimator.SetBool(runBoolName, true);
        }

        Collider triggerCollider = GetComponent<Collider>();
        if (triggerCollider != null)
        {
            triggerCollider.enabled = false;
        }
    }

    private void Update()
    {
        if (!started || fading)
            return;

        if (geppetto == null || targetPlayer == null)
            return;

        Vector3 dir = targetPlayer.position - geppetto.position;
        dir.y = 0f;

        float distance = dir.magnitude;

        if (dir.sqrMagnitude > 0.001f)
        {
            Quaternion targetRotation = Quaternion.LookRotation(dir);
            geppetto.rotation = Quaternion.Slerp(
                geppetto.rotation,
                targetRotation,
                Time.deltaTime * rotateSpeed
            );

            geppetto.position += dir.normalized * runSpeed * Time.deltaTime;
        }

        if (distance <= fadeDistance)
        {
            StartCoroutine(FadeOutAndLoadScene());
        }
    }

    private IEnumerator FadeOutAndLoadScene()
    {
        fading = true;

        if (geppettoAnimator != null && !string.IsNullOrEmpty(runBoolName))
        {
            geppettoAnimator.SetBool(runBoolName, false);
        }

        float t = 0f;

        while (t < fadeDuration)
        {
            t += Time.deltaTime;
            float alpha = Mathf.Clamp01(t / fadeDuration);

            if (blackFadeImage != null)
            {
                Color c = blackFadeImage.color;
                c.a = alpha;
                blackFadeImage.color = c;
            }

            yield return null;
        }

        if (!string.IsNullOrWhiteSpace(nextSceneName))
        {
            SceneManager.LoadScene(nextSceneName);
        }
        else
        {
            Debug.LogWarning("Next Scene NameÀÌ ºñ¾îÀÖ½À´Ï´Ù.");
        }
    }

    private bool IsPlayer(Collider other)
    {
        if (other.CompareTag(playerTag))
            return true;

        if (other.transform.root.CompareTag(playerTag))
            return true;

        return false;
    }
}