using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.SceneManagement;
using System.Collections.Generic;
using System.Collections;

public class LLGameScene : MonoBehaviour
{
    [Header("━━━ 20 LEVEL TXT DOSYALARI ━━━━━━━━━━━━")]
    public TextAsset[] wordFiles = new TextAsset[20];

    [Header("━━━ UI ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")]
    public TMP_Text questionText;
    public Button[] answerButtons;
    public TMP_Text[] answerTexts;
    public TMP_Text feedbackText;
    public Button submitButton;
    public TMP_Text scoreText;
    public TMP_Text comboText;
    public TMP_Text timerText;

    [Header("━━━ EXTRA BUTONLAR ━━━━━━━━━━━━━━━━━━━━")]
    public Button extraTimeButton;
    public Button extraHintButton;
    public Button extraSkipButton;
    public TMP_Text extraTimeCooldownText;
    public TMP_Text extraHintCooldownText;
    public TMP_Text extraSkipCooldownText;

    [Header("━━━ BACK BUTONU ━━━━━━━━━━━━━━━━━━━━━━━")]
    public Button backButton;
    public string backSceneName = "ModSec 2";

    [Header("━━━ RESULT SAHNESİ ━━━━━━━━━━━━━━━━━━━━")]
    public string resultSceneName = "ResultSceneLL";

    [Header("━━━ GAME SETTINGS ━━━━━━━━━━━━━━━━━━━━━")]
    public float startTime = 60f;
    public int basePoints = 50;
    public int wrongPenalty = 50;
    public float correctTimeBonus = 2f;

    [Header("━━━ COMBO ÇARPANLARI ━━━━━━━━━━━━━━━━━")]
    public float mult_1to2 = 1f;
    public float mult_3to4 = 1.15f;
    public float mult_5to7 = 1.3f;
    public float mult_8plus = 1.5f;

    [Header("━━━ RENK AYARLARI ━━━━━━━━━━━━━━━━━━━━━")]
    public Color normalButtonColor = new Color32(120, 70, 220, 255);
    public Color selectedButtonColor = new Color32(155, 105, 255, 255);
    public Color correctButtonColor = new Color32(70, 240, 130, 255);
    public Color wrongButtonColor = new Color32(255, 80, 95, 255);
    public Color disabledButtonColor = new Color32(90, 75, 120, 255);

    [Header("━━━ BUTON TASARIM AYARI ━━━━━━━━━━━━━━")]
    public bool butonRenginiKoru = true;

    [Header("━━━ FEEDBACK YAZISI AYARLARI ━━━━━━━━━")]
    public bool feedbackUsteAl = true;
    public float feedbackTopY = 320f;
    public float feedbackFontSize = 46f;

    [Header("━━━ ANİMASYON AYARLARI ━━━━━━━━━━━━━━━━")]
    [Range(0.80f, 1f)] public float selectedScale = 0.94f;
    public float selectAnimTime = 0.10f;
    public float enterAnimTime = 0.22f;
    public float nextQuestionDelay = 1.15f;

    float timeLeft;
    bool gameOver = false;
    bool waitingNextQuestion = false;

    bool extraTimeReady = true;
    bool extraHintReady = true;
    bool extraSkipReady = true;

    int correctAnswerIndex;
    int selectedAnswer = -1;

    int score = 0;
    int combo = 0;
    int correctCount = 0;
    int wrongCount = 0;

    readonly List<WordPair> wordPool = new List<WordPair>();

    string questionLang;
    string answerLang;
    int wordIndex = 0;

    Vector3[] originalButtonScales;
    Vector3[] originalButtonPositions;
    Coroutine[] buttonScaleCoroutines;
    Coroutine[] buttonEnterCoroutines;

    Color timerNormalColor = Color.white;
    readonly Color timerWarnColor = new Color32(255, 80, 80, 255);

    void Awake()
    {
        LoadWords();
    }

    void Start()
    {
        questionLang = PlayerPrefs.GetString("QuestionLangCode", "en");
        answerLang = PlayerPrefs.GetString("AnswerLangCode", "tr");

        timeLeft = PlayerPrefs.GetFloat("SelectedGameTime", startTime);
        if (timeLeft <= 0) timeLeft = startTime;

        if (wordPool.Count < 4)
        {
            Debug.LogError("LLGameScene kelime sayısı yetersiz! En az 4 kelime olmalı.");
            return;
        }

        HideCooldownTexts();
        CacheButtonData();
        ForceButtonTransitionNone();
        PrepareFeedbackText();
        BindMainButtons();

        Shuffle(wordPool);

        UpdateScore();
        UpdateCombo();
        UpdateTimerUI();

        NextQuestion();
    }

    void Update()
    {
        if (gameOver) return;

        timeLeft -= Time.deltaTime;

        if (timeLeft <= 0)
        {
            timeLeft = 0;
            UpdateTimerUI();
            GameOver();
            return;
        }

        UpdateTimerUI();
    }

    void LoadWords()
    {
        wordPool.Clear();

        int selectedLevel = PlayerPrefs.GetInt("SelectedLevel", 1);
        selectedLevel = Mathf.Clamp(selectedLevel, 1, wordFiles.Length);

        TextAsset file = wordFiles[selectedLevel - 1];

        if (file == null)
        {
            Debug.LogError($"Level {selectedLevel} TXT atanmadı!");
            return;
        }

        string[] lines = file.text.Split(new[] { '\n', '\r' }, System.StringSplitOptions.RemoveEmptyEntries);

        foreach (string raw in lines)
        {
            string line = raw.Trim();
            if (string.IsNullOrWhiteSpace(line)) continue;

            string[] p = line.Split(',');

            if (p.Length < 6)
            {
                Debug.LogWarning("Eksik kelime satırı atlandı: " + line);
                continue;
            }

            wordPool.Add(new WordPair(
                p[0].Trim(),
                p[1].Trim(),
                p[2].Trim(),
                p[3].Trim(),
                p[4].Trim(),
                p[5].Trim()
            ));
        }

        Debug.Log($"Level {selectedLevel} yüklendi. Kelime: {wordPool.Count}");
    }

    void HideCooldownTexts()
    {
        if (extraTimeCooldownText != null) extraTimeCooldownText.gameObject.SetActive(false);
        if (extraHintCooldownText != null) extraHintCooldownText.gameObject.SetActive(false);
        if (extraSkipCooldownText != null) extraSkipCooldownText.gameObject.SetActive(false);
    }

    void BindMainButtons()
    {
        if (submitButton != null)
        {
            submitButton.onClick.RemoveAllListeners();
            submitButton.onClick.AddListener(OnSubmit);
        }

        if (extraTimeButton != null)
        {
            extraTimeButton.onClick.RemoveAllListeners();
            extraTimeButton.onClick.AddListener(OnExtraTime);
        }

        if (extraHintButton != null)
        {
            extraHintButton.onClick.RemoveAllListeners();
            extraHintButton.onClick.AddListener(OnExtraHint);
        }

        if (extraSkipButton != null)
        {
            extraSkipButton.onClick.RemoveAllListeners();
            extraSkipButton.onClick.AddListener(OnExtraSkip);
        }

        if (backButton != null)
        {
            backButton.onClick.RemoveAllListeners();
            backButton.onClick.AddListener(() => SceneManager.LoadScene(backSceneName));
        }
    }

    void CacheButtonData()
    {
        if (answerButtons == null) return;

        originalButtonScales = new Vector3[answerButtons.Length];
        originalButtonPositions = new Vector3[answerButtons.Length];
        buttonScaleCoroutines = new Coroutine[answerButtons.Length];
        buttonEnterCoroutines = new Coroutine[answerButtons.Length];

        for (int i = 0; i < answerButtons.Length; i++)
        {
            if (answerButtons[i] == null) continue;

            originalButtonScales[i] = answerButtons[i].transform.localScale;
            originalButtonPositions[i] = answerButtons[i].transform.localPosition;
        }
    }

    void ForceButtonTransitionNone()
    {
        if (answerButtons == null) return;

        for (int i = 0; i < answerButtons.Length; i++)
        {
            if (answerButtons[i] == null) continue;

            answerButtons[i].transition = Selectable.Transition.None;

            Image img = answerButtons[i].image;
            if (img != null)
                img.color = FullAlpha(normalButtonColor);

            CanvasGroup cg = answerButtons[i].GetComponent<CanvasGroup>();
            if (cg != null)
            {
                cg.alpha = 1f;
                cg.interactable = true;
                cg.blocksRaycasts = true;
            }
        }
    }

    void PrepareFeedbackText()
    {
        if (feedbackText == null) return;

        if (feedbackUsteAl)
        {
            Vector3 pos = feedbackText.transform.localPosition;
            pos.y = feedbackTopY;
            feedbackText.transform.localPosition = pos;
        }

        feedbackText.alignment = TextAlignmentOptions.Center;
        feedbackText.fontSize = Mathf.Max(feedbackText.fontSize, feedbackFontSize);
        feedbackText.text = "";

        Color c = feedbackText.color;
        c.a = 1f;
        feedbackText.color = c;
    }

    void NextQuestion()
    {
        if (gameOver) return;
        if (wordPool.Count < 4) return;

        waitingNextQuestion = false;
        selectedAnswer = -1;

        ResetButtons();

        if (wordIndex >= wordPool.Count)
        {
            wordIndex = 0;
            Shuffle(wordPool);
        }

        WordPair chosen = wordPool[wordIndex++];

        if (questionText != null)
        {
            questionText.text = chosen.GetByCode(questionLang);
            StartCoroutine(FadeInText(questionText));
        }

        correctAnswerIndex = Random.Range(0, 4);

        if (answerTexts == null || answerTexts.Length < 4)
        {
            Debug.LogError("answerTexts en az 4 eleman olmalı.");
            return;
        }

        answerTexts[correctAnswerIndex].text = chosen.GetByCode(answerLang);

        List<WordPair> wrongPool = new List<WordPair>(wordPool);
        wrongPool.Remove(chosen);
        Shuffle(wrongPool);

        int wrongIndex = 0;

        for (int i = 0; i < 4; i++)
        {
            if (i == correctAnswerIndex) continue;

            if (wrongIndex < wrongPool.Count)
            {
                answerTexts[i].text = wrongPool[wrongIndex].GetByCode(answerLang);
                wrongIndex++;
            }
        }

        BindAnswerButtons();

        for (int i = 0; i < answerButtons.Length; i++)
        {
            if (answerButtons[i] == null) continue;

            if (buttonEnterCoroutines[i] != null)
                StopCoroutine(buttonEnterCoroutines[i]);

            buttonEnterCoroutines[i] = StartCoroutine(ButtonEnterAnim(answerButtons[i], i));
        }
    }

    void BindAnswerButtons()
    {
        if (answerButtons == null) return;

        for (int i = 0; i < answerButtons.Length; i++)
        {
            int index = i;

            if (answerButtons[i] == null) continue;

            answerButtons[i].onClick.RemoveAllListeners();
            answerButtons[i].onClick.AddListener(() => SelectAnswer(index));
        }
    }

    void ResetButtons()
    {
        if (answerButtons == null) return;

        for (int i = 0; i < answerButtons.Length; i++)
        {
            if (answerButtons[i] == null) continue;

            StopButtonCoroutines(i);

            answerButtons[i].interactable = true;
            answerButtons[i].transition = Selectable.Transition.None;

            Image img = answerButtons[i].image;
            if (img != null)
                img.color = FullAlpha(normalButtonColor);

            answerButtons[i].transform.localScale = originalButtonScales[i];
            answerButtons[i].transform.localPosition = originalButtonPositions[i];

            CanvasGroup cg = answerButtons[i].GetComponent<CanvasGroup>();
            if (cg != null)
            {
                cg.alpha = 1f;
                cg.interactable = true;
                cg.blocksRaycasts = true;
            }
        }

        if (feedbackText != null)
            feedbackText.text = "";

        if (submitButton != null)
            submitButton.interactable = true;
    }

    void SelectAnswer(int index)
    {
        if (gameOver || waitingNextQuestion) return;
        if (answerButtons == null) return;
        if (index < 0 || index >= answerButtons.Length) return;
        if (answerButtons[index] == null) return;

        if (selectedAnswer == index)
            return;

        if (selectedAnswer >= 0 && selectedAnswer < answerButtons.Length)
        {
            Button oldButton = answerButtons[selectedAnswer];

            if (oldButton != null)
            {
                Image oldImg = oldButton.image;
                if (oldImg != null)
                    oldImg.color = FullAlpha(normalButtonColor);

                StartScaleAnim(selectedAnswer, originalButtonScales[selectedAnswer]);
            }
        }

        selectedAnswer = index;

        Image img = answerButtons[index].image;
        if (img != null)
            img.color = FullAlpha(selectedButtonColor);

        CanvasGroup cg = answerButtons[index].GetComponent<CanvasGroup>();
        if (cg != null)
            cg.alpha = 1f;

        StartScaleAnim(index, originalButtonScales[index] * selectedScale);
    }

    void OnSubmit()
    {
        if (gameOver || waitingNextQuestion) return;
        if (selectedAnswer == -1) return;
        if (answerButtons == null) return;

        waitingNextQuestion = true;

        if (submitButton != null)
            submitButton.interactable = false;

        bool correct = selectedAnswer == correctAnswerIndex;

        LockAnswerButtons();

        if (correct)
            HandleCorrectAnswer();
        else
            HandleWrongAnswer();

        UpdateScore();
        UpdateCombo();

        StartCoroutine(DelayNext());
    }

    void LockAnswerButtons()
    {
        for (int i = 0; i < answerButtons.Length; i++)
        {
            if (answerButtons[i] == null) continue;

            answerButtons[i].interactable = false;

            CanvasGroup cg = answerButtons[i].GetComponent<CanvasGroup>();
            if (cg != null)
                cg.alpha = 1f;

            if (i != selectedAnswer && i != correctAnswerIndex)
            {
                Image img = answerButtons[i].image;
                if (img != null)
                    img.color = FullAlpha(normalButtonColor);
            }
        }
    }

    void HandleCorrectAnswer()
    {
        Button selectedButton = answerButtons[selectedAnswer];

        if (selectedButton != null)
        {
            Image img = selectedButton.image;

            if (img != null)
            {
                if (butonRenginiKoru)
                    img.color = FullAlpha(selectedButtonColor);
                else
                    img.color = FullAlpha(correctButtonColor);
            }

            StartCoroutine(CorrectPulse(selectedButton, selectedAnswer));
        }

        combo++;
        correctCount++;

        int addScore = Mathf.RoundToInt(basePoints * GetComboMultiplier(combo));
        score += addScore;

        timeLeft += correctTimeBonus;

        if (feedbackText != null)
        {
            feedbackText.color = FullAlpha(correctButtonColor);
            feedbackText.text = combo >= 3 ? $"TRUE   {combo}x COMBO!" : "TRUE ";

            if (feedbackUsteAl)
            {
                Vector3 pos = feedbackText.transform.localPosition;
                pos.y = feedbackTopY;
                feedbackText.transform.localPosition = pos;
            }

            StartCoroutine(FeedbackAnim(feedbackText));
        }

        if (comboText != null) StartCoroutine(ComboAnim(comboText));
        if (scoreText != null) StartCoroutine(ScorePopAnim(scoreText));
    }

    void HandleWrongAnswer()
    {
        Button selectedButton = answerButtons[selectedAnswer];

        if (selectedButton != null)
        {
            Image selectedImg = selectedButton.image;

            if (selectedImg != null)
            {
                if (butonRenginiKoru)
                    selectedImg.color = FullAlpha(selectedButtonColor);
                else
                    selectedImg.color = FullAlpha(wrongButtonColor);
            }

            StartCoroutine(ShakeButton(selectedButton, selectedAnswer));
        }

        if (correctAnswerIndex >= 0 && correctAnswerIndex < answerButtons.Length)
        {
            Button correctButton = answerButtons[correctAnswerIndex];

            if (correctButton != null)
            {
                Image correctImg = correctButton.image;

                if (correctImg != null)
                {
                    if (butonRenginiKoru)
                        correctImg.color = FullAlpha(normalButtonColor);
                    else
                        correctImg.color = FullAlpha(correctButtonColor);
                }

                StartScaleAnim(correctAnswerIndex, originalButtonScales[correctAnswerIndex] * 1.04f);
            }
        }

        wrongCount++;
        combo = 0;

        score -= wrongPenalty;
        if (score < 0) score = 0;

        if (feedbackText != null)
        {
            feedbackText.color = FullAlpha(wrongButtonColor);
            feedbackText.text = "FALSE";

            if (feedbackUsteAl)
            {
                Vector3 pos = feedbackText.transform.localPosition;
                pos.y = feedbackTopY;
                feedbackText.transform.localPosition = pos;
            }

            StartCoroutine(FeedbackAnim(feedbackText));
        }
    }

    IEnumerator DelayNext()
    {
        yield return new WaitForSeconds(nextQuestionDelay);

        if (!gameOver)
            NextQuestion();
    }

    void StartScaleAnim(int index, Vector3 targetScale)
    {
        if (index < 0 || index >= answerButtons.Length) return;
        if (answerButtons[index] == null) return;

        if (buttonScaleCoroutines[index] != null)
            StopCoroutine(buttonScaleCoroutines[index]);

        buttonScaleCoroutines[index] = StartCoroutine(ScaleButton(answerButtons[index], targetScale));
    }

    void StopButtonCoroutines(int index)
    {
        if (buttonScaleCoroutines != null && index < buttonScaleCoroutines.Length && buttonScaleCoroutines[index] != null)
        {
            StopCoroutine(buttonScaleCoroutines[index]);
            buttonScaleCoroutines[index] = null;
        }

        if (buttonEnterCoroutines != null && index < buttonEnterCoroutines.Length && buttonEnterCoroutines[index] != null)
        {
            StopCoroutine(buttonEnterCoroutines[index]);
            buttonEnterCoroutines[index] = null;
        }
    }

    IEnumerator ScaleButton(Button btn, Vector3 targetScale)
    {
        if (btn == null) yield break;

        Vector3 startScale = btn.transform.localScale;
        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / Mathf.Max(0.01f, selectAnimTime);
            btn.transform.localScale = Vector3.Lerp(startScale, targetScale, EaseOutQuad(t));
            yield return null;
        }

        btn.transform.localScale = targetScale;
    }

    IEnumerator ButtonEnterAnim(Button btn, int delayIndex)
    {
        if (btn == null) yield break;

        int idx = System.Array.IndexOf(answerButtons, btn);
        if (idx < 0) yield break;

        yield return new WaitForSeconds(delayIndex * 0.06f);

        Vector3 targetPos = originalButtonPositions[idx];
        Vector3 startPos = targetPos + Vector3.up * 35f;

        Vector3 targetScale = originalButtonScales[idx];
        Vector3 startScale = targetScale * 0.85f;

        btn.transform.localPosition = startPos;
        btn.transform.localScale = startScale;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / Mathf.Max(0.01f, enterAnimTime);

            float ease = EaseOutBack(t);

            btn.transform.localPosition = Vector3.Lerp(startPos, targetPos, ease);
            btn.transform.localScale = Vector3.Lerp(startScale, targetScale, ease);

            yield return null;
        }

        btn.transform.localPosition = targetPos;
        btn.transform.localScale = targetScale;
    }

    IEnumerator CorrectPulse(Button btn, int idx)
    {
        if (btn == null) yield break;

        Vector3 normal = originalButtonScales[idx];
        Vector3 big = normal * 1.12f;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.12f;
            btn.transform.localScale = Vector3.Lerp(normal, big, EaseOutQuad(t));
            yield return null;
        }

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.12f;
            btn.transform.localScale = Vector3.Lerp(big, normal, EaseOutQuad(t));
            yield return null;
        }

        btn.transform.localScale = normal;
    }

    IEnumerator ShakeButton(Button btn, int idx)
    {
        if (btn == null) yield break;

        Vector3 origin = originalButtonPositions[idx];

        float duration = 0.35f;
        float magnitude = 12f;
        float elapsed = 0f;

        while (elapsed < duration)
        {
            float power = 1f - elapsed / duration;
            float x = Random.Range(-1f, 1f) * magnitude * power;

            btn.transform.localPosition = origin + new Vector3(x, 0f, 0f);

            elapsed += Time.deltaTime;
            yield return null;
        }

        btn.transform.localPosition = origin;
    }

    IEnumerator FeedbackAnim(TMP_Text txt)
    {
        if (txt == null) yield break;

        Vector3 originalScale = txt.transform.localScale;
        Vector3 bigScale = originalScale * 1.18f;

        Color c = FullAlpha(txt.color);
        c.a = 0f;
        txt.color = c;

        Vector3 originalPos = txt.transform.localPosition;
        Vector3 startPos = originalPos + Vector3.down * 18f;

        txt.transform.localPosition = startPos;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.16f;

            float ease = EaseOutBack(t);

            txt.transform.localScale = Vector3.Lerp(originalScale, bigScale, ease);
            txt.transform.localPosition = Vector3.Lerp(startPos, originalPos, ease);

            c.a = Mathf.Clamp01(t);
            txt.color = c;

            yield return null;
        }

        c.a = 1f;
        txt.color = c;
        txt.transform.localPosition = originalPos;

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.12f;
            txt.transform.localScale = Vector3.Lerp(bigScale, originalScale, EaseOutQuad(t));
            yield return null;
        }

        txt.transform.localScale = originalScale;
    }

    IEnumerator ComboAnim(TMP_Text txt)
    {
        if (txt == null) yield break;

        Vector3 original = txt.transform.localScale;
        Vector3 big = original * 1.22f;

        Color baseColor = FullAlpha(txt.color);
        Color highlight = new Color32(255, 220, 50, 255);

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.12f;

            txt.transform.localScale = Vector3.Lerp(original, big, EaseOutBack(t));
            txt.color = FullAlpha(Color.Lerp(baseColor, highlight, t));

            yield return null;
        }

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.14f;

            txt.transform.localScale = Vector3.Lerp(big, original, EaseOutQuad(t));
            txt.color = FullAlpha(Color.Lerp(highlight, baseColor, t));

            yield return null;
        }

        txt.transform.localScale = original;
        txt.color = baseColor;
    }

    IEnumerator ScorePopAnim(TMP_Text txt)
    {
        if (txt == null) yield break;

        Vector3 original = txt.transform.localScale;
        Vector3 big = original * 1.18f;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.10f;
            txt.transform.localScale = Vector3.Lerp(original, big, EaseOutQuad(t));
            yield return null;
        }

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.12f;
            txt.transform.localScale = Vector3.Lerp(big, original, EaseOutQuad(t));
            yield return null;
        }

        txt.transform.localScale = original;
    }

    IEnumerator FadeInText(TMP_Text txt)
    {
        if (txt == null) yield break;

        Color c = FullAlpha(txt.color);
        c.a = 0f;
        txt.color = c;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.18f;
            c.a = EaseOutQuad(t);
            txt.color = c;
            yield return null;
        }

        c.a = 1f;
        txt.color = c;
    }

    void UpdateTimerUI()
    {
        if (timerText == null) return;

        timerText.text = Mathf.Ceil(timeLeft).ToString();

        if (timeLeft <= 10f)
        {
            timerText.color = FullAlpha(Color.Lerp(timerWarnColor, Color.white, Mathf.PingPong(Time.time * 3f, 1f)));
            timerText.transform.localScale = Vector3.one * (1f + Mathf.Sin(Time.time * 10f) * 0.05f);
        }
        else
        {
            timerText.color = FullAlpha(timerNormalColor);
            timerText.transform.localScale = Vector3.one;
        }
    }

    void UpdateScore()
    {
        if (scoreText != null)
            scoreText.text = score.ToString();
    }

    void UpdateCombo()
    {
        if (comboText != null)
            comboText.text = combo + "x Combo";
    }

    float GetComboMultiplier(int c)
    {
        if (c >= 8) return mult_8plus;
        if (c >= 5) return mult_5to7;
        if (c >= 3) return mult_3to4;
        return mult_1to2;
    }

    void OnExtraTime()
    {
        if (!extraTimeReady || gameOver) return;

        timeLeft += 5f;
        extraTimeReady = false;

        if (extraTimeButton != null)
            extraTimeButton.interactable = false;

        if (extraTimeCooldownText != null)
        {
            extraTimeCooldownText.gameObject.SetActive(true);
            StartCoroutine(Cooldown(extraTimeCooldownText, extraTimeButton, () => extraTimeReady = true));
        }
        else
        {
            StartCoroutine(SimpleCooldown(extraTimeButton, () => extraTimeReady = true));
        }
    }

    void OnExtraHint()
    {
        if (!extraHintReady || gameOver || waitingNextQuestion) return;

        int removed = 0;

        for (int i = 0; i < answerButtons.Length && removed < 2; i++)
        {
            if (i == correctAnswerIndex || i == selectedAnswer) continue;
            if (answerButtons[i] == null) continue;

            answerButtons[i].interactable = false;

            CanvasGroup cg = answerButtons[i].GetComponent<CanvasGroup>();
            if (cg != null)
                cg.alpha = 1f;

            Image img = answerButtons[i].image;
            if (img != null)
                img.color = FullAlpha(disabledButtonColor);

            if (answerTexts != null && i < answerTexts.Length && answerTexts[i] != null)
                answerTexts[i].text = "—";

            removed++;
        }

        extraHintReady = false;

        if (extraHintButton != null)
            extraHintButton.interactable = false;

        if (extraHintCooldownText != null)
        {
            extraHintCooldownText.gameObject.SetActive(true);
            StartCoroutine(Cooldown(extraHintCooldownText, extraHintButton, () => extraHintReady = true));
        }
        else
        {
            StartCoroutine(SimpleCooldown(extraHintButton, () => extraHintReady = true));
        }
    }

    void OnExtraSkip()
    {
        if (!extraSkipReady || gameOver || waitingNextQuestion) return;

        NextQuestion();

        extraSkipReady = false;

        if (extraSkipButton != null)
            extraSkipButton.interactable = false;

        if (extraSkipCooldownText != null)
        {
            extraSkipCooldownText.gameObject.SetActive(true);
            StartCoroutine(Cooldown(extraSkipCooldownText, extraSkipButton, () => extraSkipReady = true));
        }
        else
        {
            StartCoroutine(SimpleCooldown(extraSkipButton, () => extraSkipReady = true));
        }
    }

    IEnumerator Cooldown(TMP_Text label, Button button, System.Action done)
    {
        float t = 5f;

        while (t > 0f)
        {
            if (label != null)
                label.text = Mathf.Ceil(t).ToString();

            t -= Time.deltaTime;
            yield return null;
        }

        if (label != null)
        {
            label.text = "";
            label.gameObject.SetActive(false);
        }

        if (button != null)
            button.interactable = true;

        done?.Invoke();
    }

    IEnumerator SimpleCooldown(Button button, System.Action done)
    {
        yield return new WaitForSeconds(5f);

        if (button != null)
            button.interactable = true;

        done?.Invoke();
    }

    void GameOver()
    {
        if (gameOver) return;

        gameOver = true;

        PlayerPrefs.SetInt("Mod2Score", score);
        PlayerPrefs.SetInt("Mod2Correct", correctCount);
        PlayerPrefs.SetInt("Mod2Wrong", wrongCount);

        int best = PlayerPrefs.GetInt("BestScore_Mod2", 0);
        if (score > best)
            PlayerPrefs.SetInt("BestScore_Mod2", score);

        int bestCombo = PlayerPrefs.GetInt("BestCombo_Mod2", 0);
        if (combo > bestCombo)
            PlayerPrefs.SetInt("BestCombo_Mod2", combo);

        PlayerPrefs.SetInt("TotalCorrect_Mod2", PlayerPrefs.GetInt("TotalCorrect_Mod2", 0) + correctCount);
        PlayerPrefs.SetInt("TotalWrong_Mod2", PlayerPrefs.GetInt("TotalWrong_Mod2", 0) + wrongCount);
        PlayerPrefs.SetInt("PlayCount_Mod2", PlayerPrefs.GetInt("PlayCount_Mod2", 0) + 1);

        int total = PlayerPrefs.GetInt("TotalScore", 0) + score;
        PlayerPrefs.SetInt("TotalScore", total);

        PlayerPrefs.Save();

        SceneManager.LoadScene(resultSceneName);
    }

    Color FullAlpha(Color c)
    {
        c.a = 1f;
        return c;
    }

    void Shuffle<T>(List<T> list)
    {
        for (int i = 0; i < list.Count; i++)
        {
            int rnd = Random.Range(i, list.Count);
            T temp = list[i];
            list[i] = list[rnd];
            list[rnd] = temp;
        }
    }

    float EaseOutBack(float t)
    {
        t = Mathf.Clamp01(t);

        float c1 = 1.70158f;
        float c3 = c1 + 1f;

        return 1f + c3 * Mathf.Pow(t - 1f, 3f) + c1 * Mathf.Pow(t - 1f, 2f);
    }

    float EaseOutQuad(float t)
    {
        t = Mathf.Clamp01(t);
        return 1f - (1f - t) * (1f - t);
    }

    class WordPair
    {
        public string tr;
        public string en;
        public string es;
        public string de;
        public string fr;
        public string pt;

        public WordPair(string tr, string en, string es, string de, string fr, string pt)
        {
            this.tr = tr;
            this.en = en;
            this.es = es;
            this.de = de;
            this.fr = fr;
            this.pt = pt;
        }

        public string GetByCode(string code)
        {
            switch (code)
            {
                case "tr": return tr;
                case "en": return en;
                case "es": return es;
                case "de": return de;
                case "fr": return fr;
                case "pt": return pt;
                default: return en;
            }
        }
    }
}