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

public class Unscramble15Mod : MonoBehaviour
{
    [Header("━━━ TXT FILE ━━━━━━━━━━━━━━━━━━━━━━━━")]
    public TextAsset wordFile;

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

    [Header("━━━ LETTER BUTTONS - 10 BUTTON ━━━━━━")]
    public Button[] letterButtons;
    public TMP_Text[] letterTexts;

    [Header("━━━ BUTTONS ━━━━━━━━━━━━━━━━━━━━━━━━━")]
    public Button submitButton;
    public Button backButton;

    [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("━━━ SCORE UI ━━━━━━━━━━━━━━━━━━━━━━━━")]
    public TMP_Text scoreText;
    public TMP_Text comboText;
    public TMP_Text timerText;

    [Header("━━━ SCENES ━━━━━━━━━━━━━━━━━━━━━━━━━━")]
    public string backSceneName = "modsec 15";
    public string resultSceneName = "modres 15";

    [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 MULTIPLIERS ━━━━━━━━━━━━━━")]
    public float mult_1to2 = 1f;
    public float mult_3to4 = 1.15f;
    public float mult_5to7 = 1.3f;
    public float mult_8plus = 1.5f;

    [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 = 8f;

    [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 = 0.10f;
    public float enterAnimTime = 0.22f;

    const string modKey = "Mod15";

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

    class WordEntry
    {
        public string[] words = new string[6];
    }

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

    int selectedLangIndex = 1;
    int wordIndex = 0;

    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;

    string currentTargetWord = "";
    string builtAnswer = "";

    readonly List<string> scrambledLetters = new List<string>();
    readonly List<int> selectedButtonIndexes = new List<int>();

    bool[] usedButtons;

    Vector3[] originalButtonScales;
    Vector3[] originalButtonPositions;

    Coroutine[] buttonScaleCoroutines;
    Coroutine[] buttonEnterCoroutines;

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

    void Awake()
    {
        LoadWords();
    }

    void Start()
    {
        selectedLangIndex = ResolveLanguageIndex();

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

        if (timeLeft <= 0)
            timeLeft = startTime;

        if (wordPool.Count < 1)
        {
            Debug.LogError("Mod15 TXT boş veya hatalı!");
            enabled = false;
            return;
        }

        if (letterButtons == null || letterButtons.Length < 10 || letterTexts == null || letterTexts.Length < 10)
        {
            Debug.LogError("Mod15 için 10 LetterButton ve 10 LetterText atanmalı!");
            enabled = false;
            return;
        }

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

        Shuffle(wordPool);

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

        NextQuestion();
    }

    void Update()
    {
        if (gameOver)
            return;

        timeLeft -= Time.deltaTime;

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

        UpdateTimerUI();
    }

    void LoadWords()
    {
        wordPool.Clear();

        if (wordFile == null)
        {
            Debug.LogError("Unscramble15 TXT atanmadı!");
            return;
        }

        string[] lines = wordFile.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;

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

            string[] p = SplitLineSmart(line);

            if (p.Length < 6)
            {
                Debug.LogWarning("Mod15 eksik satır atlandı. Satır: " + (lineIndex + 1));
                continue;
            }

            WordEntry e = new WordEntry();

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

            wordPool.Add(e);
        }
    }

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

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

        return line.Split(',');
    }

    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("UnscrambleLangCode", "").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 PrepareQuestionText()
    {
        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.Normal;

        questionText.overflowMode = TextOverflowModes.Overflow;
    }

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

        feedbackText.alignment = TextAlignmentOptions.Center;
        feedbackText.fontSize = Mathf.Max(feedbackText.fontSize, 60f);
        feedbackText.text = "";
        feedbackText.color = FullAlpha(feedbackText.color);
    }

    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(OnExtraHint5050);
        }

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

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

    void BindLetterButtons()
    {
        for (int i = 0; i < letterButtons.Length; i++)
        {
            int index = i;

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

            letterButtons[i].onClick.RemoveAllListeners();
            letterButtons[i].onClick.AddListener(() =>
            {
                ToggleLetter(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 = letterButtons.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 (letterButtons[i] == null)
                continue;

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

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

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

            Image img = letterButtons[i].image;

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

    void NextQuestion()
    {
        if (gameOver)
            return;

        waitingNextQuestion = false;
        builtAnswer = "";

        selectedButtonIndexes.Clear();
        scrambledLetters.Clear();

        ResetAllLetterButtons();

        string target = GetNextValidTargetWord();

        if (string.IsNullOrEmpty(target))
        {
            Debug.LogError("Mod15 için 10 harften kısa/uygun kelime bulunamadı!");
            GameOver();
            return;
        }

        currentTargetWord = target;

        List<string> letters = WordToLetterList(currentTargetWord);
        scrambledLetters.AddRange(ScrambleLetters(letters));

        usedButtons = new bool[letterButtons.Length];

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

            if (i < scrambledLetters.Count)
            {
                letterButtons[i].gameObject.SetActive(true);
                letterButtons[i].interactable = true;

                Image img = letterButtons[i].image;

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

                if (letterTexts[i] != null)
                    letterTexts[i].text = scrambledLetters[i];

                usedButtons[i] = false;
            }
            else
            {
                letterButtons[i].gameObject.SetActive(false);
            }
        }

        BindLetterButtons();
        UpdateQuestionSlots();

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

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

        for (int i = 0; i < scrambledLetters.Count; i++)
        {
            if (letterButtons[i] == null)
                continue;

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

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

    string GetNextValidTargetWord()
    {
        int maxLength = Mathf.Min(10, letterButtons.Length);
        int safety = wordPool.Count;

        for (int attempt = 0; attempt < safety; attempt++)
        {
            if (wordIndex >= wordPool.Count)
            {
                wordIndex = 0;
                Shuffle(wordPool);
            }

            WordEntry chosen = wordPool[wordIndex++];
            string target = PrepareTargetWord(chosen.words[selectedLangIndex]);

            if (!string.IsNullOrEmpty(target) && target.Length >= 2 && target.Length <= maxLength)
                return target;
        }

        return "";
    }

    string PrepareTargetWord(string raw)
    {
        if (string.IsNullOrWhiteSpace(raw))
            return "";

        string result = "";

        foreach (char c in raw)
        {
            if (char.IsLetter(c))
            {
                string ch = c.ToString();

                if (questionUppercase)
                    ch = UpperByLanguage(ch);

                result += ch;
            }
        }

        return result;
    }

    List<string> WordToLetterList(string word)
    {
        List<string> letters = new List<string>();

        for (int i = 0; i < word.Length; i++)
            letters.Add(word[i].ToString());

        return letters;
    }

    List<string> ScrambleLetters(List<string> originalLetters)
    {
        List<string> mixed = new List<string>(originalLetters);

        if (mixed.Count <= 2)
        {
            Shuffle(mixed);
            return mixed;
        }

        string original = string.Join("", originalLetters);

        for (int attempt = 0; attempt < 30; attempt++)
        {
            Shuffle(mixed);

            string test = string.Join("", mixed);

            if (test != original)
                return mixed;
        }

        return mixed;
    }

    void ToggleLetter(int index)
    {
        if (gameOver || waitingNextQuestion)
            return;

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

        if (index >= scrambledLetters.Count)
            return;

        if (usedButtons == null)
            return;

        if (usedButtons[index])
            CancelLetter(index);
        else
            SelectLetter(index);
    }

    void SelectLetter(int index)
    {
        usedButtons[index] = true;

        if (!selectedButtonIndexes.Contains(index))
            selectedButtonIndexes.Add(index);

        RebuildAnswerFromSelectedButtons();

        if (letterButtons[index] != null)
        {
            Image img = letterButtons[index].image;

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

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

        UpdateQuestionSlots();
    }

    void CancelLetter(int index)
    {
        usedButtons[index] = false;

        if (selectedButtonIndexes.Contains(index))
            selectedButtonIndexes.Remove(index);

        RebuildAnswerFromSelectedButtons();

        if (letterButtons[index] != null)
        {
            Image img = letterButtons[index].image;

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

            StartScaleAnim(index, originalButtonScales[index]);
        }

        UpdateQuestionSlots();
    }

    void RebuildAnswerFromSelectedButtons()
    {
        builtAnswer = "";

        for (int i = 0; i < selectedButtonIndexes.Count; i++)
        {
            int btnIndex = selectedButtonIndexes[i];

            if (btnIndex >= 0 && btnIndex < scrambledLetters.Count)
                builtAnswer += scrambledLetters[btnIndex];
        }
    }

    void UpdateQuestionSlots()
    {
        List<string> display = new List<string>();

        for (int i = 0; i < currentTargetWord.Length; i++)
        {
            if (i < builtAnswer.Length)
                display.Add(builtAnswer[i].ToString());
            else
                display.Add("_");
        }

        if (questionText != null)
            questionText.text = string.Join(" ", display);
    }

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

        if (builtAnswer.Length < currentTargetWord.Length)
        {
            if (feedbackText != null)
            {
                feedbackText.color = FullAlpha(wrongButtonColor);
                feedbackText.text = "COMPLETE THE WORD";
                StartCoroutine(FeedbackAnim(feedbackText));
            }

            return;
        }

        waitingNextQuestion = true;

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

        LockLetterButtons();

        if (builtAnswer == currentTargetWord)
            HandleCorrectAnswer();
        else
            HandleWrongAnswer();

        UpdateScore();
        UpdateCombo();

        StartCoroutine(DelayNext());
    }

    void LockLetterButtons()
    {
        for (int i = 0; i < scrambledLetters.Count; i++)
        {
            if (letterButtons[i] == null)
                continue;

            letterButtons[i].interactable = false;
        }
    }

    void HandleCorrectAnswer()
    {
        for (int i = 0; i < selectedButtonIndexes.Count; i++)
        {
            int index = selectedButtonIndexes[i];

            if (index < 0 || index >= letterButtons.Length)
                continue;

            if (letterButtons[index] == null)
                continue;

            Image img = letterButtons[index].image;

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

            StartCoroutine(CorrectPulse(letterButtons[index], index));
        }

        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()
    {
        for (int i = 0; i < selectedButtonIndexes.Count; i++)
        {
            int index = selectedButtonIndexes[i];

            if (index < 0 || index >= letterButtons.Length)
                continue;

            if (letterButtons[index] == null)
                continue;

            Image img = letterButtons[index].image;

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

            StartCoroutine(ShakeButton(letterButtons[index], index));
        }

        wrongCount++;
        combo = 0;

        score -= wrongPenalty;

        if (score < 0)
            score = 0;

        if (questionText != null)
            questionText.text = FormatWithSpaces(currentTargetWord);

        if (feedbackText != null)
        {
            feedbackText.color = FullAlpha(wrongButtonColor);
            feedbackText.text = "WRONG\nCorrect: " + FormatWithSpaces(currentTargetWord);
            StartCoroutine(FeedbackAnim(feedbackText));
        }
    }

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

        if (!gameOver)
            NextQuestion();
    }

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

        timeLeft += 5f;
        extraTimeReady = false;

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

        StartCoroutine(Cooldown(extraTimeCooldownText, extraTimeButton, () => extraTimeReady = true));
    }

    void OnExtraHint5050()
    {
        if (!extraHintReady || gameOver || waitingNextQuestion)
            return;

        int autoSelected = 0;

        while (autoSelected < 2 && builtAnswer.Length < currentTargetWord.Length)
        {
            int nextPosition = builtAnswer.Length;
            string neededLetter = currentTargetWord[nextPosition].ToString();

            int foundIndex = FindUnusedButtonWithLetter(neededLetter);

            if (foundIndex == -1)
                break;

            SelectLetter(foundIndex);
            autoSelected++;
        }

        extraHintReady = false;

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

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

    int FindUnusedButtonWithLetter(string neededLetter)
    {
        for (int i = 0; i < scrambledLetters.Count; i++)
        {
            if (usedButtons[i])
                continue;

            if (scrambledLetters[i] == neededLetter)
                return i;
        }

        return -1;
    }

    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 = 5f;

        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("Mod15Skor", score);
        PlayerPrefs.SetInt("Mod15Score", score);
        PlayerPrefs.SetInt("Mod15Correct", correctCount);
        PlayerPrefs.SetInt("Mod15Wrong", wrongCount);

        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);

        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;
    }

    string FormatWithSpaces(string word)
    {
        List<string> letters = new List<string>();

        for (int i = 0; i < word.Length; i++)
            letters.Add(word[i].ToString());

        return string.Join(" ", letters);
    }

    string UpperByLanguage(string text)
    {
        if (string.IsNullOrEmpty(text))
            return "";

        CultureInfo culture = CultureInfo.InvariantCulture;

        switch (langCodes[selectedLangIndex])
        {
            case "tr":
                culture = new CultureInfo("tr-TR");
                break;

            case "es":
                culture = new CultureInfo("es-ES");
                break;

            case "de":
                culture = new CultureInfo("de-DE");
                break;

            case "fr":
                culture = new CultureInfo("fr-FR");
                break;

            case "pt":
                culture = new CultureInfo("pt-BR");
                break;

            default:
                culture = CultureInfo.InvariantCulture;
                break;
        }

        return text.ToUpper(culture);
    }

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

            StopButtonCoroutines(i);

            letterButtons[i].gameObject.SetActive(true);
            letterButtons[i].interactable = true;
            letterButtons[i].transition = Selectable.Transition.None;

            Image img = letterButtons[i].image;

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

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

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

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

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

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

        buttonScaleCoroutines[index] = StartCoroutine(ScaleButton(letterButtons[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)
    {
        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)
    {
        int idx = System.Array.IndexOf(letterButtons, btn);

        if (idx < 0)
            yield break;

        yield return new WaitForSeconds(delayIndex * 0.04f);

        Vector3 targetPos = originalButtonPositions[idx];
        Vector3 startPos = targetPos + Vector3.up * 25f;

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

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

        float t = 0f;

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

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

            c.a = Mathf.Clamp01(t);
            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, EaseOutQuad(t));
            yield return null;
        }

        txt.transform.localScale = originalScale;
    }

    IEnumerator ComboAnim(TMP_Text txt)
    {
        Vector3 original = txt.transform.localScale;
        Vector3 big = original * 1.22f;

        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, EaseOutQuad(t));
            yield return null;
        }

        txt.transform.localScale = original;
    }

    IEnumerator ScorePopAnim(TMP_Text txt)
    {
        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;
    }

    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);
    }

    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;
        }
    }
}