using UnityEngine;
using UnityEngine.UI;
using TMPro;

/// <summary>
/// UI 中央调度器：引用所有子面板，绑定 StepManager 事件。
/// 挂在 Canvas GameObject 上。
/// </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 TMP_Text _tipText;

    [Header("=== 详细操作说明（甲方补充 - 学习模式） ===")]
    [SerializeField] private GameObject _detailPanel;
    [SerializeField] private TMP_Text _detailText;

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

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

    [Header("=== 右侧功能按钮 ===")]
    [SerializeField] private Button _btnFullScreen;
    [SerializeField] private Button _btnPrevious;
    [SerializeField] private Button _btnNext;
    [SerializeField] private Button _btnSwitchMode;
    [SerializeField] private Button _btnReturn;
    [SerializeField] private TMP_Text _btnSwitchModeLabel;

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

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

    [Header("=== 底部主菜单图标 ===")]
    [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()
    {
        BindEvents();
        BindButtons();
    }

    #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);
    }

    private void BindButtons()
    {
        _btnFullScreen?.onClick.AddListener(ToggleFullScreen);
        _btnPrevious?.onClick.AddListener(OnPreviousClicked);
        _btnNext?.onClick.AddListener(OnNextClicked);
        _btnSwitchMode?.onClick.AddListener(OnSwitchModeClicked);
        _btnReturn?.onClick.AddListener(OnReturnClicked);

        _btnLimbFixation?.onClick.AddListener(() => _stepManager?.SwitchFixation(FixationMethod.LimbFixation));
        _btnSplintFixation?.onClick.AddListener(() => _stepManager?.SwitchFixation(FixationMethod.SplintFixation));
    }

    #endregion

    #region UI 更新回调

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

    #endregion

    #region 考核弹窗

    private void ShowExamPopup(StepData step)
    {
        if (_examPopup == null) return;
        _examPopup.Show(step, OnExamAnswer);
    }

    private void OnExamAnswer(float proportion, string feedback)
    {
        _stepManager?.OnStepInteractionComplete(proportion, feedback);
        _stepManager?.NextStep();
    }

    #endregion

    #region 实验完成

    private void OnExperimentComplete()
    {
        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;
    }

    private void OnPreviousClicked()
    {
        _stepManager?.PreviousStep();
    }

    private void OnNextClicked()
    {
        if (_stepManager.Mode == ExperimentMode.Exam)
        {
            var step = _stepManager.GetCurrentStep();
            if (step != null && step.CompleteType != StepCompleteType.MultipleChoice)
                _stepManager.OnStepInteractionComplete(1f);
        }
        _stepManager.NextStep();
    }

    private void OnSwitchModeClicked()
    {
        var newMode = _stepManager.Mode == ExperimentMode.Learn
            ? ExperimentMode.Exam : ExperimentMode.Learn;
        _stepManager.SwitchMode(newMode);
    }

    private void OnReturnClicked()
    {
        UnityEngine.SceneManagement.SceneManager.LoadScene("MainMenu");
    }

    #endregion
}