using UnityEngine;
using UnityEngine.UI;

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 GameObject _videoPanel;

    [Header("=== 仿真导航栏按钮 ===")]
    [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 GameObject _endPanel;

    private void Start()
    {
        Debug.Log("=== UIManager 初始化开始 ===");
        HideVideo();
        if (_endPanel != null) _endPanel.SetActive(false);

        if (_stepManager == null)
            _stepManager = FindObjectOfType<StepManager>();
        
        if (_interactionSystem == null)
            _interactionSystem = FindObjectOfType<InteractionSystem>();

        BindEvents();
        BindButtons();        
        BindNavbarButtons();  
        Debug.Log("=== UIManager 初始化完成 ===");
    }

    private void BindNavbarButtons()
    {
        var experimentPanel = GameObject.Find("ExperimentPanel");
        if (experimentPanel == null) return;
        var navbar = experimentPanel.transform.Find("Navbar");
        if (navbar == null) return;

        var btnFS = navbar.Find("FullScreen");
        if (btnFS != null) { var btn = btnFS.GetComponent<Button>(); if (btn != null) { btn.onClick.RemoveListener(ToggleFullScreen); btn.onClick.AddListener(ToggleFullScreen); } }

        var btnPrev = navbar.Find("Previous");
        if (btnPrev != null) { var btn = btnPrev.GetComponent<Button>(); if (btn != null) { btn.onClick.RemoveListener(OnPreviousClicked); btn.onClick.AddListener(OnPreviousClicked); } }

        var btnNext = navbar.Find("Next");
        if (btnNext != null) { var btn = btnNext.GetComponent<Button>(); if (btn != null) { btn.onClick.RemoveListener(OnNextClicked); btn.onClick.AddListener(OnNextClicked); } }

        var btnReturn = navbar.Find("BtnBack");
        if (btnReturn != null) { var btn = btnReturn.GetComponent<Button>(); if (btn != null) { btn.onClick.RemoveListener(OnReturnClicked); btn.onClick.AddListener(OnReturnClicked); } }
    }

    private void BindButtons()
    {
        if (_btnFullScreen != null) { _btnFullScreen.onClick.RemoveListener(ToggleFullScreen); _btnFullScreen.onClick.AddListener(ToggleFullScreen); }
        if (_btnPrevious != null) { _btnPrevious.onClick.RemoveListener(OnPreviousClicked); _btnPrevious.onClick.AddListener(OnPreviousClicked); }
        if (_btnNext != null) { _btnNext.onClick.RemoveListener(OnNextClicked); _btnNext.onClick.AddListener(OnNextClicked); }
        if (_btnSwitchMode != null) { _btnSwitchMode.onClick.RemoveListener(OnSwitchModeClicked); _btnSwitchMode.onClick.AddListener(OnSwitchModeClicked); }
        if (_btnReturn != null) { _btnReturn.onClick.RemoveListener(OnReturnClicked); _btnReturn.onClick.AddListener(OnReturnClicked); }
    }

    private void BindEvents()
    {
        if (_stepManager == null) return;
        _stepManager.OnStepChanged.AddListener(OnStepChanged);
        _stepManager.OnTipChanged.AddListener(UpdateTipContent);
        _stepManager.OnDialogueChanged.AddListener(UpdateDialogueContent);
        _stepManager.OnDetailedContent.AddListener(UpdateDetailContent);
        _stepManager.OnVideoToggle.AddListener(ToggleVideo);
        _stepManager.OnExamPopup.AddListener(ShowExamPopup);
        _stepManager.OnExperimentComplete.AddListener(OnExperimentComplete);
        _stepManager.OnModeUIUpdate.AddListener(UpdateModeUI);
    }

    private void UpdateModeUI(bool isExamMode)
    {
        if (_btnSwitchModeLabel != null)
            _btnSwitchModeLabel.text = isExamMode ? "切换到：练习模式" : "切换到：考核模式";
    }

    private void OnStepChanged(int stepIndex)
    {
        UpdateProgressBar();
        UpdateNavigationButtons();
    }

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

    private void UpdateDialogueContent(string text)
    {
        if (_dialogueBubble == null)
        {
            var t = GameObject.Find("Canvas")?.transform.Find("DialogueBubble");
            if (t != null) _dialogueBubble = t.gameObject;
        }

        if (_dialogueBubble != null) 
        {
            _dialogueBubble.SetActive(!string.IsNullOrEmpty(text));
            var txt = _dialogueBubble.GetComponentInChildren<Text>();
            if (txt != null) txt.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 (active && !string.IsNullOrEmpty(fileName)) ShowVideo(fileName);
        else HideVideo();
    }

    public void ShowVideo(string fileName)
    {
        if (_videoPanel != null)
        {
            _videoPanel.SetActive(true);
            var vp = _videoPanel.GetComponentInChildren<UnityEngine.Video.VideoPlayer>(true);
            if (vp != null) vp.Play();
        }
    }

    public void HideVideo()
    {
        if (_videoPanel != null)
        {
            var vp = _videoPanel.GetComponentInChildren<UnityEngine.Video.VideoPlayer>(true);
            if (vp != null) vp.Stop();
            _videoPanel.SetActive(false);
        }
    }

    public void ShowEndPanel()
    {
        if (_endPanel == null)
        {
            var t = GameObject.Find("Canvas")?.transform.Find("EndPanel");
            if (t != null) _endPanel = t.gameObject;
        }
        
        if (_endPanel != null)
        {
            _endPanel.SetActive(true);
            
            // 绑定返回首页按钮
            var btnRet = _endPanel.transform.Find("BtnReturn")?.GetComponent<Button>();
            if (btnRet != null)
            {
                btnRet.onClick.RemoveAllListeners();
                btnRet.onClick.AddListener(OnReturnClicked);
            }
        }
    }

    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 = true;
        if (_btnNext != null)
        {
            var label = _btnNext.GetComponentInChildren<Text>();
            if (label != null) label.text = "下一步";
        }
    }

    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();
    }

    private void OnExperimentComplete()
    {
        ShowEndPanel();
    }

    private void ToggleFullScreen() { Screen.fullScreen = !Screen.fullScreen; }

    private void OnNextClicked()
    {
        if (_stepManager == null) _stepManager = FindObjectOfType<StepManager>();
        
        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 OnPreviousClicked()
    {
        if (_stepManager == null) _stepManager = FindObjectOfType<StepManager>();
        _stepManager?.PreviousStep();
    }

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

    private void OnReturnClicked()
    {
        // 先隐藏面板
        if (_endPanel != null) _endPanel.SetActive(false);
        
        var pageCtrl = FindObjectOfType<PageController>();
        if (pageCtrl != null) pageCtrl.ReturnToHome();
    }
}