using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// UI 中央调度器：引用所有子面板，绑定 StepManager 事件。
/// 按钮策略：同时绑定 Inspector 引用（旧 RightButtons）和 ExperimentPanel/Navbar 按钮（新 UI），
/// 两者均可触发，互不冲突。
/// </summary>
public class UIManager : MonoBehaviour
{
    [Header("管理器引用")]
    [SerializeField] private StepManager _stepManager;
    [SerializeField] private InteractionSystem _interactionSystem;

    [Header("=== 顶部提示栏 ===")]
    [SerializeField] private GameObject _tipPanel;
    [SerializeField] private Text _tipText;

    [Header("=== 详细操作说明面板 ===")]
    [SerializeField] private GameObject _detailPanel;
    [SerializeField] private Text _detailText;

    [Header("=== 对话气泡 ===")]
    [SerializeField] private GameObject _dialogueBubble;
    [SerializeField] private Text _dialogueText;

    [Header("=== 画中画视频 ===")]
    [SerializeField] private VideoController _videoController;

    [Header("=== 仿真导航栏按钮（旧引用 + Navbar）===")]
    [SerializeField] private Button _btnFullScreen;
    [SerializeField] private Button _btnPrevious;
    [SerializeField] private Button _btnNext;
    [SerializeField] private Button _btnSwitchMode;
    [SerializeField] private Button _btnReturn;
    [SerializeField] private Text _btnSwitchModeLabel;

    [Header("=== 底部进度条 ===")]
    [SerializeField] private Slider _progressBar;
    [SerializeField] private Text _progressText;

    [Header("=== 弹窗 ===")]
    [SerializeField] private ExamPopup _examPopup;
    [SerializeField] private ScoreDisplay _scoreDisplay;

    [Header("=== 底部图标 ===")]
    [SerializeField] private Button _btnCPR;
    [SerializeField] private Button _btnFracture;
    [SerializeField] private Button _btnSprain;
    [SerializeField] private Button _btnBleeding;
    [SerializeField] private Button _btnTransport;

    [Header("=== 固定方式选择（仅骨折固定） ===")]
    [SerializeField] private GameObject _fixationPanel;
    [SerializeField] private Button _btnLimbFixation;
    [SerializeField] private Button _btnSplintFixation;

    private void Start()
    {
        Debug.Log("=== UIManager 初始化开始 ===");

        if (_stepManager == null)
        {
            _stepManager = FindObjectOfType<StepManager>();
            if (_stepManager != null) Debug.Log("UIManager: _stepManager 自动查找成功");
            else Debug.LogError("UIManager: _stepManager 未找到！");
        }

        if (_interactionSystem == null)
        {
            _interactionSystem = FindObjectOfType<InteractionSystem>();
            if (_interactionSystem != null) Debug.Log("UIManager: _interactionSystem 自动查找成功");
        }

        BindEvents();
        BindButtons();        // 旧引用（RightButtons 等）
        BindNavbarButtons();  // 新 Navbar 按钮
        Debug.Log("=== UIManager 初始化完成 ===");
    }

    #region Navbar 按钮绑定（始终执行，不依赖 Inspector 引用）

    private void BindNavbarButtons()
    {
        Debug.Log("--- UIManager: 开始绑定 Navbar 按钮 ---");

        var experimentPanel = GameObject.Find("ExperimentPanel");
        if (experimentPanel == null)
        {
            Debug.LogError("UIManager: ExperimentPanel 未找到！无法绑定 Navbar 按钮！");
            return;
        }

        var navbar = experimentPanel.transform.Find("Navbar");
        if (navbar == null)
        {
            Debug.LogError("UIManager: ExperimentPanel/Navbar 未找到！无法绑定 Navbar 按钮！");
            return;
        }

        // FullScreen
        var btnFS = navbar.Find("FullScreen");
        if (btnFS != null)
        {
            var btn = btnFS.GetComponent<Button>();
            if (btn != null)
            {
                btn.onClick.AddListener(ToggleFullScreen);
                Debug.Log("UIManager: Navbar/FullScreen 绑定成功 -> ToggleFullScreen");
            }
        }
        else Debug.LogWarning("UIManager: Navbar/FullScreen 未找到");

        // Previous
        var btnPrev = navbar.Find("Previous");
        if (btnPrev != null)
        {
            var btn = btnPrev.GetComponent<Button>();
            if (btn != null)
            {
                btn.onClick.AddListener(OnPreviousClicked);
                Debug.Log("UIManager: Navbar/Previous 绑定成功 -> OnPreviousClicked");
            }
        }
        else Debug.LogWarning("UIManager: Navbar/Previous 未找到");

        // Next
        var btnNext = navbar.Find("Next");
        if (btnNext != null)
        {
            var btn = btnNext.GetComponent<Button>();
            if (btn != null)
            {
                btn.onClick.AddListener(OnNextClicked);
                Debug.Log("UIManager: Navbar/Next 绑定成功 -> OnNextClicked");
            }
        }
        else Debug.LogWarning("UIManager: Navbar/Next 未找到");

        // PracticeMode
        var btnMode = navbar.Find("PracticeMode");
        if (btnMode != null)
        {
            var btn = btnMode.GetComponent<Button>();
            if (btn != null)
            {
                btn.onClick.AddListener(OnSwitchModeClicked);
                Debug.Log("UIManager: Navbar/PracticeMode 绑定成功 -> OnSwitchModeClicked");
            }
        }
        else Debug.LogWarning("UIManager: Navbar/PracticeMode 未找到");

        // BtnBack（返回按钮）
        var btnBack = navbar.Find("BtnBack");
        if (btnBack != null)
        {
            var btn = btnBack.GetComponent<Button>();
            if (btn != null)
            {
                btn.onClick.AddListener(OnReturnClicked);
                Debug.Log("UIManager: Navbar/BtnBack 绑定成功 -> OnReturnClicked");
            }
        }
        else Debug.LogWarning("UIManager: Navbar/BtnBack 未找到");

        Debug.Log("--- UIManager: Navbar 按钮绑定完成 ---");
    }

    #endregion

    #region 事件绑定

    private void BindEvents()
    {
        if (_stepManager == null) return;

        _stepManager.OnStepChanged.AddListener(OnStepChanged);
        _stepManager.OnTipChanged.AddListener(UpdateTip);
        _stepManager.OnDialogueChanged.AddListener(UpdateDialogue);
        _stepManager.OnDetailedContent.AddListener(UpdateDetailContent);
        _stepManager.OnExamPopup.AddListener(ShowExamPopup);
        _stepManager.OnExperimentComplete.AddListener(OnExperimentComplete);
        _stepManager.OnVideoToggle.AddListener(ToggleVideo);
        Debug.Log("UIManager: StepManager 事件绑定完成");
    }

    private void BindButtons()
    {
        if (_btnFullScreen != null) { _btnFullScreen.onClick.AddListener(ToggleFullScreen); Debug.Log("UIManager: _btnFullScreen 绑定成功"); }
        if (_btnPrevious != null) { _btnPrevious.onClick.AddListener(OnPreviousClicked); Debug.Log("UIManager: _btnPrevious 绑定成功"); }
        if (_btnNext != null) { _btnNext.onClick.AddListener(OnNextClicked); Debug.Log("UIManager: _btnNext 绑定成功"); }
        if (_btnSwitchMode != null) { _btnSwitchMode.onClick.AddListener(OnSwitchModeClicked); Debug.Log("UIManager: _btnSwitchMode 绑定成功"); }
        if (_btnReturn != null) { _btnReturn.onClick.AddListener(OnReturnClicked); Debug.Log("UIManager: _btnReturn 绑定成功"); }

        // 注意: _btnLimbFixation/_btnSplintFixation 不再在这里绑定 SwitchFixation，
        // 固定方式选择由 PageController 的 OnFixationSelected 统一处理，避免双重触发污染 StepManager 状态。
    }

    #endregion

    #region UI 更新回调

    private void OnStepChanged(int index)
    {
        Debug.Log($"UIManager: [OnStepChanged] 步骤 = {index + 1}");
        UpdateProgressBar();
        UpdateNavigationButtons();
    }

    private void UpdateTip(string text)
    {
        if (_tipPanel != null) _tipPanel.SetActive(!string.IsNullOrEmpty(text));
        if (_tipText != null) _tipText.text = text;
    }

    private void UpdateDialogue(string text)
    {
        if (_dialogueBubble != null) _dialogueBubble.SetActive(!string.IsNullOrEmpty(text));
        if (_dialogueText != null) _dialogueText.text = text;
    }

    private void UpdateDetailContent(string text)
    {
        if (_detailPanel != null) _detailPanel.SetActive(!string.IsNullOrEmpty(text));
        if (_detailText != null) _detailText.text = text;
    }

    private void ToggleVideo(string fileName, bool active)
    {
        Debug.Log($"UIManager: [ToggleVideo] file={fileName}, active={active}");
        if (_videoController == null) return;
        if (active && !string.IsNullOrEmpty(fileName))
            _videoController.PlayVideo(fileName);
        else
            _videoController.StopVideo();
    }

    private void UpdateProgressBar()
    {
        if (_stepManager == null) return;
        int cur = _stepManager.CurrentStepIndex + 1;
        int total = _stepManager.TotalSteps;
        if (_progressBar != null) _progressBar.value = (float)cur / total;
        if (_progressText != null) _progressText.text = cur + "/" + total;
    }

    private void UpdateNavigationButtons()
    {
        if (_stepManager == null) return;
        if (_btnPrevious != null) _btnPrevious.interactable = _stepManager.CurrentStepIndex > 0;
        if (_btnNext != null)
        {
            var label = _btnNext.GetComponentInChildren<Text>();
            bool isLast = _stepManager.CurrentStepIndex >= _stepManager.TotalSteps - 1;
            if (label != null) label.text = isLast ? "完成" : "下一步";
        }
    }

    #endregion

    #region 考核弹窗

    private void ShowExamPopup(StepData step)
    {
        Debug.Log($"UIManager: [ShowExamPopup] 题目={step.ExamQuestionText}");
        if (_examPopup == null) return;
        _examPopup.Show(step, OnExamAnswer);
    }

    private void OnExamAnswer(float proportion, string feedback)
    {
        Debug.Log($"UIManager: [OnExamAnswer] proportion={proportion}, feedback={feedback}");
        _stepManager?.OnStepInteractionComplete(proportion, feedback);
        _stepManager?.NextStep();
    }

    #endregion

    #region 实验完成

    private void OnExperimentComplete()
    {
        Debug.Log("UIManager: [OnExperimentComplete] 实验完成");
        var gm = GameManager.Instance;
        if (gm == null) return;
        if (gm.CurrentMode == ExperimentMode.Exam)
            _scoreDisplay?.ShowExamScore();
        else
            _scoreDisplay?.ShowNotesOnly();
    }

    #endregion

    #region 按钮回调

    private void ToggleFullScreen()
    {
        Screen.fullScreen = !Screen.fullScreen;
        Debug.Log($"UIManager: [ToggleFullScreen] 全屏 = {Screen.fullScreen}");
    }

    private void OnPreviousClicked()
    {
        Debug.Log("UIManager: [OnPreviousClicked] -> 上一步");
        _stepManager?.PreviousStep();
    }

    private void OnNextClicked()
    {
        Debug.Log("UIManager: [OnNextClicked] -> 下一步");
        if (_stepManager != null && _stepManager.Mode == ExperimentMode.Exam)
        {
            var step = _stepManager.GetCurrentStep();
            if (step != null && step.CompleteType != StepCompleteType.MultipleChoice)
                _stepManager.OnStepInteractionComplete(1f);
        }
        _stepManager?.NextStep();
    }

    private void OnSwitchModeClicked()
    {
        if (_stepManager == null) return;
        var oldMode = _stepManager.Mode;
        var newMode = oldMode == ExperimentMode.Learn ? ExperimentMode.Exam : ExperimentMode.Learn;
        Debug.Log($"UIManager: [OnSwitchModeClicked] 切换 {oldMode} -> {newMode}");
        _stepManager.SwitchMode(newMode);
    }

    private void OnReturnClicked()
    {
        Debug.Log("UIManager: [OnReturnClicked] -> 返回首页");
        var pageCtrl = FindObjectOfType<PageController>();
        if (pageCtrl != null)
            pageCtrl.ReturnToHome();
        else
            Debug.LogWarning("UIManager: 未找到 PageController。");
    }

    #endregion
}