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

public class Pronunciation13Mod : MonoBehaviour
{
    [Header("TXT FILE")]
    public TextAsset pronunciationFile;

    [Header("UI")]
    public TMP_Text questionText;
    public TMP_Text languageText;

    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("QUESTION FONT")]
    public bool questionUppercase = true;
    public float questionFontSize = 86f;
    public Color questionColor = Color.white;
    public FontStyles questionFontStyle = FontStyles.Bold;
    public TextAlignmentOptions questionAlignment = TextAlignmentOptions.Center;
    public float questionCharacterSpacing = 4f;

    [Header("EXTRA BUTTONS")]
    public Button extraTimeButton;
    public Button extraHintButton;
    public Button extraSkipButton;

    public TMP_Text extraTimeCooldownText;
    public TMP_Text extraHintCooldownText;
    public TMP_Text extraSkipCooldownText;

    [Header("EXTRA SETTINGS")]
    public float extraTimeAmount = 5f;
    public float cooldownDuration = 5f;

    [Header("SCENES")]
    public Button backButton;
    public string backSceneName = "modsec 13";
    public string resultSceneName = "modres 13";

    [Header("LANGUAGE")]
    public string forcedLanguageCode = "";

    [Header("GAME SETTINGS")]
    public float startTime = 60f;
    public int basePoints = 50;
    public int wrongPenalty = 50;
    public float correctTimeBonus = 2f;
    public float nextQuestionDelay = 1.15f;

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

    [Header("COLORS")]
    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("ANIMATION")]
    [Range(0.80f, 1f)]
    public float selectedScale = 0.94f;

    public float selectAnimTime = 0.12f;
    public float enterAnimTime = 0.30f;
    public float enterStagger = 0.07f;

    const string modKey = "Mod13";

    readonly string[] langCodes = { "tr", "en", "es", "de", "fr", "pt" };
    readonly string[] langNames = { "TR", "EN", "ES", "DE", "FR", "PT" };

    class PronunciationEntry
    {
        public string[] words = new string[6];

        // Unity string[,] serialize edemez.
        // 6 dil x 4 seçenek = 24 alan olarak tutulur.
        public string[] options = new string[24];

        public void SetOption(int langIndex, int optionIndex, string value)
        {
            options[langIndex * 4 + optionIndex] = value;
        }

        public string GetOption(int langIndex, int optionIndex)
        {
            return options[langIndex * 4 + optionIndex];
        }
    }

    readonly List<PronunciationEntry> questionPool = new List<PronunciationEntry>();

    int selectedLangIndex = 1;
    int questionIndex = 0;
    int correctAnswerIndex = -1;
    int selectedAnswer = -1;
    int lastQuestionShown = -1;

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

    float timeLeft;

    bool gameOver = false;
    bool waitingNextQuestion = false;

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

    Vector3[] originalButtonScales;
    Vector3[] originalButtonPositions;

    Coroutine[] buttonScaleCoroutines;
    Coroutine[] buttonEnterCoroutines;

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

    void Awake()
    {
        LoadQuestions();
    }

    void Start()
    {
        selectedLangIndex = ResolveLanguageIndex();

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

        if (timeLeft <= 0)
            timeLeft = startTime;

        if (questionPool.Count < 1)
        {
            Debug.LogError("Mod 13 TXT boş veya hatalı!");
            enabled = false;
            return;
        }

        if (answerButtons == null || answerButtons.Length < 4 || answerTexts == null || answerTexts.Length < 4)
        {
            Debug.LogError("Mod13 için 4 answerButtons ve 4 answerTexts gerekli!");
            enabled = false;
            return;
        }

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

        Shuffle(questionPool);

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

        NextQuestion();
    }

    void Update()
    {
        if (gameOver)
            return;

        timeLeft -= Time.deltaTime;

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

        UpdateTimerUI();
    }

    void LoadQuestions()
    {
        questionPool.Clear();

        if (pronunciationFile == null)
        {
            Debug.LogError("Pronunciation13 TXT atanmadı!");
            return;
        }

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

        for (int lineIndex = 0; lineIndex < lines.Length; lineIndex++)
        {
            string line = lines[lineIndex].Trim();

            if (string.IsNullOrWhiteSpace(line))
                continue;

            string lower = line.ToLower();

            if (lower.StartsWith("tr,en,es,de,fr,pt"))
                continue;

            if (lower.StartsWith("tr|en|es|de|fr|pt"))
                continue;

            string[] p = SplitLineSmart(line);

            if (p.Length < 30)
            {
                Debug.LogWarning("Mod13 eksik satır atlandı. Satır: " + (lineIndex + 1) + " Alan: " + p.Length);
                continue;
            }

            PronunciationEntry e = new PronunciationEntry();

            bool valid = true;

            for (int i = 0; i < 6; i++)
            {
                e.words[i] = CleanField(p[i]);

                if (string.IsNullOrWhiteSpace(e.words[i]))
                    valid = false;
            }

            int cursor = 6;

            for (int lang = 0; lang < 6; lang++)
            {
                for (int opt = 0; opt < 4; opt++)
                {
                    string value = CleanField(p[cursor]);
                    e.SetOption(lang, opt, value);

                    if (string.IsNullOrWhiteSpace(value))
                        valid = false;

                    cursor++;
                }
            }

            if (valid)
                questionPool.Add(e);
            else
                Debug.LogWarning("Mod13 boş alanlı satır atlandı. Satır: " + (lineIndex + 1));
        }
    }

    string[] SplitLineSmart(string line)
    {
        if (line.Contains("|"))
            return line.Split('|');

        if (line.Contains("\t"))
            return line.Split('\t');

        return SplitCsvLine(line).ToArray();
    }

    List<string> SplitCsvLine(string line)
    {
        List<string> result = new List<string>();
        bool inQuotes = false;
        string current = "";

        for (int i = 0; i < line.Length; i++)
        {
            char ch = line[i];

            if (ch == '"')
            {
                inQuotes = !inQuotes;
                continue;
            }

            if (ch == ',' && !inQuotes)
            {
                result.Add(current);
                current = "";
            }
            else
            {
                current += ch;
            }
        }

        result.Add(current);
        return result;
    }

    string CleanField(string s)
    {
        if (string.IsNullOrEmpty(s))
            return "";

        return s.Trim().Trim('"').Trim();
    }

    int ResolveLanguageIndex()
    {
        string code = forcedLanguageCode.Trim().ToLower();

        if (string.IsNullOrEmpty(code))
            code = PlayerPrefs.GetString("PronunciationLangCode", "").Trim().ToLower();

        if (string.IsNullOrEmpty(code))
            code = PlayerPrefs.GetString("QuestionLangCode", "").Trim().ToLower();

        if (!string.IsNullOrEmpty(code))
        {
            for (int i = 0; i < langCodes.Length; i++)
            {
                if (code == langCodes[i])
                    return i;
            }
        }

        int appLang = PlayerPrefs.GetInt("AppLanguage", 1);

        if (appLang < 0 || appLang > 5)
            appLang = 1;

        return appLang;
    }

    void PrepareQuestionFont()
    {
        if (questionText == null)
            return;

        questionText.fontSize = questionFontSize;
        questionText.color = FullAlpha(questionColor);
        questionText.fontStyle = questionFontStyle;
        questionText.alignment = questionAlignment;
        questionText.characterSpacing = questionCharacterSpacing;

        // Unity 6 uyumlu yeni kullanım
        questionText.textWrappingMode = TextWrappingModes.NoWrap;

        questionText.overflowMode = TextOverflowModes.Overflow;
    }

    void UpdateLanguageUI()
    {
        if (languageText != null)
            languageText.text = "LANG: " + langNames[selectedLangIndex];
    }

    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 BindAnswerButtons()
    {
        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 HideCooldownTexts()
    {
        if (extraTimeCooldownText != null)
            extraTimeCooldownText.gameObject.SetActive(false);

        if (extraHintCooldownText != null)
            extraHintCooldownText.gameObject.SetActive(false);

        if (extraSkipCooldownText != null)
            extraSkipCooldownText.gameObject.SetActive(false);
    }

    void CacheButtonData()
    {
        int len = answerButtons.Length;

        originalButtonScales = new Vector3[len];
        originalButtonPositions = new Vector3[len];
        buttonScaleCoroutines = new Coroutine[len];
        buttonEnterCoroutines = new Coroutine[len];

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

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

            if (answerButtons[i].GetComponent<CanvasGroup>() == null)
                answerButtons[i].gameObject.AddComponent<CanvasGroup>();
        }
    }

    void ForceButtonTransitionNone()
    {
        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;

        feedbackText.alignment = TextAlignmentOptions.Center;
        feedbackText.fontSize = Mathf.Max(feedbackText.fontSize, 72f);
        feedbackText.text = "";
        feedbackText.color = FullAlpha(feedbackText.color);
    }

    void NextQuestion()
    {
        if (gameOver)
            return;

        waitingNextQuestion = false;
        selectedAnswer = -1;

        ResetButtons();

        if (questionIndex >= questionPool.Count)
        {
            questionIndex = 0;
            Shuffle(questionPool);
        }

        if (questionPool.Count > 1 && questionIndex == lastQuestionShown)
        {
            questionIndex++;

            if (questionIndex >= questionPool.Count)
            {
                questionIndex = 0;
                Shuffle(questionPool);
            }
        }

        lastQuestionShown = questionIndex;
        PronunciationEntry chosen = questionPool[questionIndex++];

        string word = chosen.words[selectedLangIndex];

        if (questionUppercase)
            word = word.ToUpper();

        if (questionText != null)
        {
            questionText.text = word;
            StartCoroutine(QuestionEnterAnim(questionText));
        }

        List<string> options = new List<string>();

        for (int i = 0; i < 4; i++)
            options.Add(chosen.GetOption(selectedLangIndex, i));

        string correctText = chosen.GetOption(selectedLangIndex, 0);

        Shuffle(options);

        correctAnswerIndex = options.IndexOf(correctText);

        for (int i = 0; i < 4; i++)
        {
            if (answerTexts[i] != null)
                answerTexts[i].text = options[i];
        }

        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 ResetButtons()
    {
        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;
            answerButtons[i].transform.localRotation = Quaternion.identity;

            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 (index < 0 || index >= answerButtons.Length)
            return;

        if (answerButtons[index] == null)
            return;

        if (!answerButtons[index].interactable)
            return;

        if (selectedAnswer == index)
            return;

        if (selectedAnswer >= 0)
        {
            Image oldImg = answerButtons[selectedAnswer].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);

        StartSelectPopAnim(index);
    }

    void OnSubmit()
    {
        if (gameOver || waitingNextQuestion)
            return;

        if (selectedAnswer == -1)
        {
            if (feedbackText != null)
            {
                feedbackText.color = FullAlpha(wrongButtonColor);
                feedbackText.text = "CHOOSE AN ANSWER";
                StartCoroutine(FeedbackAnim(feedbackText));
            }

            return;
        }

        waitingNextQuestion = true;

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

        LockAnswerButtons();

        if (selectedAnswer == correctAnswerIndex)
            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;

            if (i != selectedAnswer && i != correctAnswerIndex)
            {
                Image img = answerButtons[i].image;

                if (img != null)
                    img.color = FullAlpha(normalButtonColor);
            }
        }
    }

    void HandleCorrectAnswer()
    {
        Image img = answerButtons[selectedAnswer].image;

        if (img != null)
            img.color = FullAlpha(correctButtonColor);

        StartCoroutine(CorrectPulse(answerButtons[selectedAnswer], selectedAnswer));

        combo++;
        correctCount++;

        if (combo > bestComboThisRun)
            bestComboThisRun = combo;

        score += Mathf.RoundToInt(basePoints * GetComboMultiplier(combo));
        timeLeft += correctTimeBonus;

        if (feedbackText != null)
        {
            feedbackText.color = FullAlpha(correctButtonColor);
            feedbackText.text = combo >= 3 ? "CORRECT " + combo + "x COMBO!" : "CORRECT";
            StartCoroutine(FeedbackAnim(feedbackText));
        }

        if (comboText != null)
            StartCoroutine(ComboAnim(comboText));

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

    void HandleWrongAnswer()
    {
        Image wrongImg = answerButtons[selectedAnswer].image;

        if (wrongImg != null)
            wrongImg.color = FullAlpha(wrongButtonColor);

        StartCoroutine(ShakeButton(answerButtons[selectedAnswer], selectedAnswer));

        if (correctAnswerIndex >= 0 && correctAnswerIndex < answerButtons.Length)
        {
            Image correctImg = answerButtons[correctAnswerIndex].image;

            if (correctImg != null)
                correctImg.color = FullAlpha(correctButtonColor);

            StartCoroutine(CorrectReveal(answerButtons[correctAnswerIndex], correctAnswerIndex));
        }

        wrongCount++;
        combo = 0;

        score -= wrongPenalty;

        if (score < 0)
            score = 0;

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

            if (correctAnswerIndex >= 0 && correctAnswerIndex < answerTexts.Length && answerTexts[correctAnswerIndex] != null)
                feedbackText.text = "WRONG\nCorrect: " + answerTexts[correctAnswerIndex].text;
            else
                feedbackText.text = "WRONG";

            StartCoroutine(FeedbackAnim(feedbackText));
        }
    }

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

        if (!gameOver)
            NextQuestion();
    }

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

        timeLeft += extraTimeAmount;
        extraTimeReady = false;

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

        StartCoroutine(Cooldown(extraTimeCooldownText, 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)
                continue;

            if (selectedAnswer >= 0 && i == selectedAnswer)
                continue;

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

            if (!answerButtons[i].interactable)
                continue;

            answerButtons[i].interactable = false;

            Image img = answerButtons[i].image;

            if (img != null)
                img.color = FullAlpha(disabledButtonColor);

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

            StartCoroutine(FadeOutButton(answerButtons[i]));

            removed++;
        }

        extraHintReady = false;

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

        StartCoroutine(Cooldown(extraHintCooldownText, extraHintButton, () => extraHintReady = true));
    }

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

        NextQuestion();

        extraSkipReady = false;

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

        StartCoroutine(Cooldown(extraSkipCooldownText, extraSkipButton, () => extraSkipReady = true));
    }

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

        if (label != null)
            label.gameObject.SetActive(true);

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

    void GameOver()
    {
        if (gameOver)
            return;

        gameOver = true;

        PlayerPrefs.SetString("LastPlayedMod", modKey);

        PlayerPrefs.SetInt("Mod13Skor", score);

        PlayerPrefs.SetInt(modKey + "_LastScore", score);
        PlayerPrefs.SetInt(modKey + "_Correct", correctCount);
        PlayerPrefs.SetInt(modKey + "_Wrong", wrongCount);
        PlayerPrefs.SetInt(modKey + "_LastCombo", combo);
        PlayerPrefs.SetInt(modKey + "_BestComboRun", bestComboThisRun);
        PlayerPrefs.SetInt(modKey + "_LastTimeLeft", Mathf.CeilToInt(timeLeft));

        int totalAnswers = correctCount + wrongCount;
        int accuracy = totalAnswers > 0 ? Mathf.RoundToInt((correctCount / (float)totalAnswers) * 100f) : 0;

        PlayerPrefs.SetInt(modKey + "_LastAccuracy", accuracy);

        if (score > PlayerPrefs.GetInt(modKey + "_MaxScore", 0))
            PlayerPrefs.SetInt(modKey + "_MaxScore", score);

        if (bestComboThisRun > PlayerPrefs.GetInt(modKey + "_BestCombo", 0))
            PlayerPrefs.SetInt(modKey + "_BestCombo", bestComboThisRun);

        PlayerPrefs.SetInt(modKey + "_TotalCorrect", PlayerPrefs.GetInt(modKey + "_TotalCorrect", 0) + correctCount);
        PlayerPrefs.SetInt(modKey + "_TotalWrong", PlayerPrefs.GetInt(modKey + "_TotalWrong", 0) + wrongCount);
        PlayerPrefs.SetInt(modKey + "_PlayCount", PlayerPrefs.GetInt(modKey + "_PlayCount", 0) + 1);

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

        int prevBest = PlayerPrefs.GetInt("Mod13Score", 0);

        if (score > prevBest)
            PlayerPrefs.SetInt("Mod13Score", score);

        PlayerPrefs.SetInt("Mod13LastScore", score);
        PlayerPrefs.SetInt("Mod13Correct", correctCount);
        PlayerPrefs.SetInt("Mod13Wrong", wrongCount);

        PlayerPrefs.Save();

        SceneManager.LoadScene(resultSceneName);
    }

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

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

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

        timerText.text = Mathf.CeilToInt(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;
        }
    }

    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 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 StartSelectPopAnim(int index)
    {
        if (index < 0 || index >= answerButtons.Length)
            return;

        if (answerButtons[index] == null)
            return;

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

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

    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)
    {
        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, EaseOutCubic(t));
            yield return null;
        }

        btn.transform.localScale = targetScale;
    }

    IEnumerator SelectPop(Button btn, int idx)
    {
        Vector3 baseScale = originalButtonScales[idx];
        Vector3 target = baseScale * selectedScale;
        Vector3 pop = baseScale * 1.06f;

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

        while (t < 1f)
        {
            t += Time.deltaTime / 0.09f;
            btn.transform.localScale = Vector3.Lerp(start, pop, EaseOutCubic(t));
            yield return null;
        }

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.10f;
            btn.transform.localScale = Vector3.Lerp(pop, target, EaseOutBack(t));
            yield return null;
        }

        btn.transform.localScale = target;
    }

    IEnumerator ButtonEnterAnim(Button btn, int idx)
    {
        CanvasGroup cg = btn.GetComponent<CanvasGroup>();

        Vector3 targetPos = originalButtonPositions[idx];
        Vector3 startPos = targetPos + Vector3.up * 45f;

        Vector3 targetScale = originalButtonScales[idx];
        Vector3 startScale = targetScale * 0.80f;

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

        if (cg != null)
            cg.alpha = 0f;

        yield return new WaitForSeconds(idx * enterStagger);

        float t = 0f;

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

            float easePos = EaseOutBack(t);
            float easeFade = EaseOutCubic(Mathf.Clamp01(t * 1.4f));

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

            if (cg != null)
                cg.alpha = easeFade;

            yield return null;
        }

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

        if (cg != null)
            cg.alpha = 1f;
    }

    IEnumerator CorrectPulse(Button btn, int idx)
    {
        Vector3 normal = originalButtonScales[idx];
        Vector3 big = normal * 1.16f;
        Vector3 mid = normal * 1.05f;

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

        while (t < 1f)
        {
            t += Time.deltaTime / 0.11f;
            btn.transform.localScale = Vector3.Lerp(start, big, EaseOutBack(t));
            yield return null;
        }

        t = 0f;

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

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.10f;
            btn.transform.localScale = Vector3.Lerp(mid, normal, EaseOutCubic(t));
            yield return null;
        }

        btn.transform.localScale = normal;
    }

    IEnumerator CorrectReveal(Button btn, int idx)
    {
        Vector3 normal = originalButtonScales[idx];
        Vector3 big = normal * 1.10f;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.18f;
            btn.transform.localScale = Vector3.Lerp(normal, big, EaseOutBack(t));
            yield return null;
        }

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.16f;
            btn.transform.localScale = Vector3.Lerp(big, normal, EaseOutCubic(t));
            yield return null;
        }

        btn.transform.localScale = normal;
    }

    IEnumerator ShakeButton(Button btn, int idx)
    {
        Vector3 origin = originalButtonPositions[idx];
        Quaternion originRot = btn.transform.localRotation;

        float duration = 0.40f;
        float magnitude = 16f;
        float elapsed = 0f;

        while (elapsed < duration)
        {
            float power = 1f - (elapsed / duration);
            power *= power;

            float wave = Mathf.Sin(elapsed * 55f);
            float x = wave * magnitude * power;
            float rot = wave * 4f * power;

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

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

        btn.transform.localPosition = origin;
        btn.transform.localRotation = originRot;
    }

    IEnumerator FadeOutButton(Button btn)
    {
        CanvasGroup cg = btn.GetComponent<CanvasGroup>();

        if (cg == null)
            yield break;

        float start = cg.alpha;
        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.20f;
            cg.alpha = Mathf.Lerp(start, 0.35f, EaseOutCubic(t));
            yield return null;
        }

        cg.alpha = 0.35f;
    }

    IEnumerator QuestionEnterAnim(TMP_Text txt)
    {
        Color c = FullAlpha(txt.color);

        Vector3 baseScale = Vector3.one;
        Vector3 startScale = baseScale * 0.85f;

        c.a = 0f;
        txt.color = c;
        txt.transform.localScale = startScale;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.22f;
            c.a = EaseOutCubic(t);
            txt.color = c;
            txt.transform.localScale = Vector3.Lerp(startScale, baseScale, EaseOutBack(t));
            yield return null;
        }

        c.a = 1f;
        txt.color = c;
        txt.transform.localScale = baseScale;
    }

    IEnumerator FeedbackAnim(TMP_Text txt)
    {
        Vector3 originalScale = Vector3.one;
        Vector3 smallScale = originalScale * 0.8f;
        Vector3 bigScale = originalScale * 1.20f;

        Color c = FullAlpha(txt.color);

        c.a = 0f;
        txt.color = c;
        txt.transform.localScale = smallScale;

        float t = 0f;

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

            txt.transform.localScale = Vector3.Lerp(smallScale, bigScale, EaseOutBack(t));

            c.a = Mathf.Clamp01(t * 1.5f);
            txt.color = c;

            yield return null;
        }

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

        t = 0f;

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

        txt.transform.localScale = originalScale;
    }

    IEnumerator ComboAnim(TMP_Text txt)
    {
        Vector3 original = Vector3.one;
        Vector3 big = original * 1.25f;

        float t = 0f;

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

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / 0.14f;
            txt.transform.localScale = Vector3.Lerp(big, original, EaseOutCubic(t));
            yield return null;
        }

        txt.transform.localScale = original;
    }

    IEnumerator ScorePopAnim(TMP_Text txt)
    {
        Vector3 original = Vector3.one;
        Vector3 big = original * 1.18f;

        float t = 0f;

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

        t = 0f;

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

        txt.transform.localScale = original;
    }

    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 EaseOutCubic(float t)
    {
        t = Mathf.Clamp01(t);
        return 1f - Mathf.Pow(1f - t, 3f);
    }
}