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

/// <summary>
/// 片头动画流程控制器：控制 man 的 Idle → Shoot → Fall 流程，
/// 摔倒后黑幕转场，显示 woman 和 maninjury，切换到 camera2。
/// 挂载在 [Managers] 上，由 PageController 在用户选定固定方式后调用。
/// </summary>
public class OpeningFlowController : MonoBehaviour
{
    [Header("=== 角色引用 ===")]
    [SerializeField] private Animator _manAnimator;
    [SerializeField] private Animator _man2Animator;
    [SerializeField] private GameObject _man2Object;
    [SerializeField] private GameObject _womanObject;
    [SerializeField] private GameObject _manInjuryObject;

    [Header("=== 黑幕 UI ===")]
    [SerializeField] private GameObject _blackScreenPanel;
    [SerializeField] private Image _blackScreenImage;

    [Header("=== 时间配置 ===")]
    [SerializeField] private float _idleDuration = 2f;
    [SerializeField] private float _fadeDuration = 1f;
    [SerializeField] private float _fallHoldDuration = 1.5f;

    private void Start()
    {
        AutoAssignReferences();

        if (_womanObject != null) _womanObject.SetActive(false);
        if (_manInjuryObject != null) _manInjuryObject.SetActive(false);

        if (_blackScreenPanel != null)
        {
            _blackScreenPanel.SetActive(true);
            if (_blackScreenImage != null)
                _blackScreenImage.color = new Color(0, 0, 0, 0);
            Debug.Log("[OpeningFlow] BlackScreenPanel 已就绪，初始透明");
        }

        Debug.Log("[OpeningFlow] 就绪，等待用户选择模式和固定方式。");
    }

    private void AutoAssignReferences()
    {
        var manGo = GameObject.Find("man");
        if (manGo != null && _manAnimator == null)
            _manAnimator = manGo.GetComponent<Animator>();

        var man2Go = GameObject.Find("man2");
        if (man2Go != null)
        {
            if (_man2Animator == null) _man2Animator = man2Go.GetComponent<Animator>();
            if (_man2Object == null) _man2Object = man2Go;
        }

        if (_womanObject == null) _womanObject = GameObject.Find("woman");
        if (_manInjuryObject == null) _manInjuryObject = GameObject.Find("maninjury");

        if (_blackScreenPanel == null)
            _blackScreenPanel = GameObject.Find("BlackScreenPanel");
        if (_blackScreenPanel == null)
        {
            var allImages = FindObjectsOfType<Image>(true);
            foreach (var img in allImages)
            {
                if (img.name == "BlackScreenPanel")
                {
                    _blackScreenPanel = img.gameObject;
                    _blackScreenImage = img;
                    Debug.Log("[OpeningFlow] BlackScreenPanel 通过 includeInactive 兜底找到");
                    break;
                }
            }
        }
        if (_blackScreenPanel != null && _blackScreenImage == null)
            _blackScreenImage = _blackScreenPanel.GetComponent<Image>();

        if (_blackScreenPanel == null)
            Debug.LogWarning("[OpeningFlow] BlackScreenPanel 未找到！黑幕转场将不会显示");
        else
            Debug.Log($"[OpeningFlow] BlackScreenPanel 已找到: activeInHierarchy={_blackScreenPanel.activeInHierarchy}, Image={_blackScreenImage != null}");
    }

    public void PlayOpeningFlow(System.Action onComplete)
    {
        Debug.Log("[OpeningFlow] PlayOpeningFlow() 被调用");
        StartCoroutine(RunOpeningFlow(onComplete));
    }

    private IEnumerator RunOpeningFlow(System.Action onComplete)
    {
        Debug.Log("=== [OpeningFlow] 片头动画流程开始 ===");

        if (_manAnimator != null)
        {
            _manAnimator.SetBool("IsStart", false);
            _manAnimator.SetBool("IsFull", false);
            _manAnimator.Play("manIdle", 0, 0f);
            Debug.Log("[OpeningFlow] man Animator 已重置: IsStart=false, IsFull=false, 强制播放 manIdle");
        }

        Debug.Log($"[OpeningFlow] Step1: man + man2 Idle ({_idleDuration}s)");
        yield return new WaitForSeconds(_idleDuration);

        // Step 2: Shoot —— 每帧强制 IsFull=false 防止 Animator 中途切走
        Debug.Log("[OpeningFlow] Step2: man Shoot 动画开始");
        if (_manAnimator != null)
        {
            _manAnimator.SetBool("IsFull", false);
            _manAnimator.SetBool("IsStart", true);
            Debug.Log("[OpeningFlow] man IsStart=true, IsFull=false, 触发 Shoot，每帧锁定 IsFull=false");

            float shootElapsed = 0f;
            while (shootElapsed < 3.15f)
            {
                shootElapsed += Time.deltaTime;
                _manAnimator.SetBool("IsFull", false);
                yield return null;
            }
            _manAnimator.SetBool("IsStart", false);
            Debug.Log("[OpeningFlow] Step2: man Shoot 动画结束");
        }

        // Step 3: 摔倒 —— manfull 2.1s + 停留1s
        Debug.Log("[OpeningFlow] Step3: man Fall 动画开始");
        if (_manAnimator != null)
        {
            _manAnimator.SetBool("IsFull", true);
            Debug.Log("[OpeningFlow] man IsFull=true, 触发 manfull (2.1s)");
            yield return new WaitForSeconds(2.1f);
            Debug.Log("[OpeningFlow] Step3: man Fall 动画结束, 停留1s");
            yield return new WaitForSeconds(1f);
        }

        // Step 4: 黑幕转场 —— 渐入 -> 切换角色+摄像机 -> 渐出
        Debug.Log("[OpeningFlow] Step4: 黑幕转场开始");
        yield return StartCoroutine(FadeBlackScreen(0f, 1f));

        // 隐藏 man 和 man2，显示 woman 和 maninjury
        if (_manAnimator != null) { _manAnimator.gameObject.SetActive(false); Debug.Log("[OpeningFlow] man 已隐藏"); }
        if (_man2Object != null) { _man2Object.SetActive(false); Debug.Log("[OpeningFlow] man2 已隐藏"); }
        if (_womanObject != null) { _womanObject.SetActive(true); Debug.Log("[OpeningFlow] woman 已显示"); }
        if (_manInjuryObject != null) { _manInjuryObject.SetActive(true); Debug.Log("[OpeningFlow] maninjury 已显示"); }

        SwitchToCamera2();

        yield return new WaitForSeconds(0.3f);
        yield return StartCoroutine(FadeBlackScreen(1f, 0f));

        Debug.Log("=== [OpeningFlow] 片头动画流程完成 ===");
        onComplete?.Invoke();
    }

    private void SwitchToCamera2()
    {
        var camera2Go = GameObject.Find("camera2");
        if (camera2Go != null)
        {
            var cam2 = camera2Go.GetComponent<Camera>();
            if (cam2 != null)
            {
                cam2.enabled = true;
                Debug.Log("[OpeningFlow] camera2 已启用");
            }
            else Debug.LogWarning("[OpeningFlow] camera2 上没有 Camera 组件");

            var mainCam = Camera.main;
            if (mainCam != null) { mainCam.enabled = false; Debug.Log("[OpeningFlow] 主摄像机已禁用"); }
        }
        else Debug.LogWarning("[OpeningFlow] 未找到 camera2");
    }

    private IEnumerator FadeBlackScreen(float fromAlpha, float toAlpha)
    {
        if (_blackScreenPanel == null || _blackScreenImage == null)
        {
            Debug.LogWarning("[OpeningFlow] BlackScreenPanel/Image 为空，跳过转场");
            yield break;
        }

        _blackScreenPanel.SetActive(true);

        float elapsed = 0f;
        while (elapsed < _fadeDuration)
        {
            elapsed += Time.deltaTime;
            float t = Mathf.Clamp01(elapsed / _fadeDuration);
            _blackScreenImage.color = new Color(0, 0, 0, Mathf.Lerp(fromAlpha, toAlpha, t));
            yield return null;
        }

        _blackScreenImage.color = new Color(0, 0, 0, toAlpha);
        if (toAlpha <= 0.01f)
            _blackScreenPanel.SetActive(false);
    }
}