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。
/// 挂在一个独立的空 GameObject 上（如 SceneRoot）。
/// </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;

    private void Start()
    {
        // 自动查找引用
        AutoAssignReferences();

        // 初始状态确认：woman 和 maninjury 应该隐藏
        if (_womanObject != null) _womanObject.SetActive(false);
        if (_manInjuryObject != null) _manInjuryObject.SetActive(false);
        if (_blackScreenPanel != null) _blackScreenPanel.SetActive(false);

        // 不自动启动动画流程 —— 等待用户选择模式和固定方式后由 PageController 触发
        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 (_blackScreenImage == null && _blackScreenPanel != null)
            _blackScreenImage = _blackScreenPanel.GetComponent<Image>();
    }

    /// <summary>
    /// 公开方法：由 PageController 在用户选定固定方式后调用。
    /// 播放片头动画（man Idle→Shoot→Fall→黑幕转场→显示woman+maninjury），
    /// 完成后回调 onComplete。
    /// </summary>
    public void PlayOpeningFlow(System.Action onComplete)
    {
        Debug.Log("[OpeningFlow] PlayOpeningFlow() 被调用，开始播放片头动画。");
        StartCoroutine(RunOpeningFlow(onComplete));
    }

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

        // 强制重置 man 所有动画参数，确保从 Idle 状态开始
        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");
        }
        else
        {
            Debug.LogWarning("[OpeningFlow] _manAnimator 为空！");
        }

        // Step 1: man 和 man2 同时 Idle，持续 _idleDuration 秒
        Debug.Log($"[OpeningFlow] Step1: man + man2 Idle ({_idleDuration}s)");
        yield return new WaitForSeconds(_idleDuration);

        // Step 2: man 投篮动画 Shoot (3.15s)
        // 先确保 IsFull=false（因为 Idle→Shoot 过渡条件需要 IsFull=false）
        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");
            yield return new WaitForSeconds(3.15f);
            _manAnimator.SetBool("IsStart", false);
            Debug.Log("[OpeningFlow] Step2: man Shoot 动画结束");
        }
        else
        {
            Debug.LogWarning("[OpeningFlow] _manAnimator 为空，跳过 Step2");
        }

        // Step 3: man 摔倒动画 manfull (2.1s)
        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");
            yield return new WaitForSeconds(2.1f);
            Debug.Log("[OpeningFlow] Step3: man Fall 动画结束");
        }
        else
        {
            Debug.LogWarning("[OpeningFlow] _manAnimator 为空，跳过 Step3");
        }

        // 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));

        // 切换角色
        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"); }

        // 切换摄像机到 camera2
        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();
    }

    /// <summary>
    /// 切换到 camera2，禁用主摄像机
    /// </summary>
    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！");
            }

            // 禁用主摄像机（MainCamera 或标签为 MainCamera 的）
            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，摄像机未切换");
        }
    }

    private IEnumerator FadeBlackScreen(float fromAlpha, float toAlpha)
    {
        if (_blackScreenPanel == null || _blackScreenImage == null)
        {
            Debug.LogWarning("[OpeningFlow] BlackScreenPanel 或 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);
    }
}