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

public class TetrisTranslationDropMod : MonoBehaviour
{
    [Header("━━━ FALLING BLOCK ━━━━━━━━━━━━━━━━━━━━━")]
    public RectTransform fallingBlock;
    public TMP_Text fallingText;

    [Header("━━━ CONTROLS ━━━━━━━━━━━━━━━━━━━━━━━━━")]
    public Button btnLeft;
    public Button btnRight;
    public Button btnDown;
    public Button backButton;

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

    [Header("━━━ TRANSLATION SLOTS (4) ━━━━━━━━━━━━━")]
    public RectTransform[] translationSlots;
    public TMP_Text[] translationSlotTexts;

    [Header("━━━ WORD TXT ━━━━━━━━━━━━━━━━━━━━━━━━━")]
    [Tooltip("Each line: tr,en,es,de,fr,pt")]
    public TextAsset wordsTxt;

    [Header("━━━ SCENE SETTINGS ━━━━━━━━━━━━━━━━━━━")]
    public string backSceneName = "ModSec 7";
    public string resultSceneName = "Mod7Resume";

    [Header("━━━ GAME SETTINGS ━━━━━━━━━━━━━━━━━━━")]
    public float baseFallSpeed = 220f;
    public float maxFallSpeed = 620f;
    public float fallSpeedIncreaseRate = 12f;

    public float moveStep = 140f;
    public float fastFallStep = 350f;

    public float gameTime = 90f;
    public float nextWordDelay = 0.75f;

    public int correctBaseScore = 50;
    public int comboBonus = 10;
    public int wrongPenalty = 20;

    [Header("━━━ SCREEN LIMITS ━━━━━━━━━━━━━━━━━━━━")]
    public float minX = -420f;
    public float maxX = 420f;
    public float spawnY = 650f;
    public float bottomLimitY = -650f;

    [Header("━━━ COLORS ━━━━━━━━━━━━━━━━━━━━━━━━━━")]
    public Color normalSlotColor = new Color32(255, 255, 255, 255);
    public Color correctSlotColor = new Color32(70, 220, 120, 255);
    public Color wrongSlotColor = new Color32(240, 80, 80, 255);
    public Color feedbackCorrectColor = new Color32(70, 220, 120, 255);
    public Color feedbackWrongColor = new Color32(240, 80, 80, 255);
    public Color timerNormalColor = new Color32(255, 255, 255, 255);
    public Color timerWarningColor = new Color32(255, 80, 80, 255);

    [Header("━━━ ANIMATION SETTINGS ━━━━━━━━━━━━━━━")]
    public float blockSpawnScale = 0.82f;
    public float blockSpawnAnimTime = 0.18f;
    public float slotPulseScale = 1.08f;
    public float slotPulseTime = 0.12f;
    public float shakeAmount = 12f;
    public float shakeTime = 0.28f;

    [Header("━━━ SOUND ━━━━━━━━━━━━━━━━━━━━━━━━━━━")]
    public AudioSource sfxSource;
    public AudioClip clickClip;
    public AudioClip correctClip;
    public AudioClip wrongClip;

    // INTERNAL
    private List<WordEntry> fullDeck = new List<WordEntry>();
    private int deckIndex = 0;

    private WordEntry currentWord;
    private string correctAnswer = "";
    private string lastWordKey = "";

    private float timer;
    private float currentFallSpeed;
    private float smoothVelocity = 0f;

    private bool processing = false;
    private bool gameOver = false;

    private int score = 0;
    private int combo = 0;
    private int bestComboThisRun = 0;

    private int correctCount = 0;
    private int wrongCount = 0;

    private string questionLangCode;
    private string answerLangCode = "en";
    private string uiLangCode;

    private Vector3[] originalSlotScales;
    private Vector2[] originalSlotPositions;
    private Vector3 originalBlockScale = Vector3.one;

    private Coroutine blockSpawnCo;
    private Coroutine blockReactCo;
    private Coroutine feedbackCo;
    private Coroutine[] slotCoroutines;

    private string modKey = "Mod7";

    private class WordEntry
    {
        public string tr;
        public string en;
        public string es;
        public string de;
        public string fr;
        public string pt;

        public string Key => tr + "_" + en;
    }

    // ======================================================
    void Start()
    {
        gameOver = false;
        processing = false;

        questionLangCode = GetQuestionLanguage();
        answerLangCode = "en";
        uiLangCode = GetUILanguage();

        PlayerPrefs.SetString("QuestionLangCode", questionLangCode);
        PlayerPrefs.SetString("AnswerLangCode", answerLangCode);
        PlayerPrefs.Save();

        timer = PlayerPrefs.GetFloat("SelectedGameTime", gameTime);

        if (timer <= 0)
            timer = gameTime;

        currentFallSpeed = baseFallSpeed;

        CacheSlotData();
        LoadWords();

        if (fullDeck.Count < 4)
        {
            Debug.LogError("Mod7 kelime dosyası en az 4 satır olmalı! Format: tr,en,es,de,fr,pt");
            enabled = false;
            return;
        }

        if (!ValidateUI())
        {
            enabled = false;
            return;
        }

        BindButtons();

        Shuffle(fullDeck);

        UpdateUI();
        UpdateTimerUI();
        SaveProgress();

        SpawnNewWord();
    }

    // ======================================================
    void Update()
    {
        if (gameOver || processing) return;

        timer -= Time.deltaTime;

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

        UpdateTimerUI();

        float targetSpeed = baseFallSpeed + (score / 250f) * fallSpeedIncreaseRate;
        targetSpeed = Mathf.Clamp(targetSpeed, baseFallSpeed, maxFallSpeed);

        currentFallSpeed = Mathf.SmoothDamp(
            currentFallSpeed,
            targetSpeed,
            ref smoothVelocity,
            0.18f
        );

        if (fallingBlock != null)
            fallingBlock.anchoredPosition += Vector2.down * currentFallSpeed * Time.deltaTime;

        CheckCollision();
    }

    // ======================================================
    bool ValidateUI()
    {
        if (fallingBlock == null)
        {
            Debug.LogError("fallingBlock atanmadı!");
            return false;
        }

        if (fallingText == null)
        {
            Debug.LogError("fallingText atanmadı!");
            return false;
        }

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

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

        return true;
    }

    void BindButtons()
    {
        if (btnLeft != null)
        {
            btnLeft.onClick.RemoveAllListeners();
            btnLeft.onClick.AddListener(() =>
            {
                PlayClick();
                Move(-moveStep);
            });
        }

        if (btnRight != null)
        {
            btnRight.onClick.RemoveAllListeners();
            btnRight.onClick.AddListener(() =>
            {
                PlayClick();
                Move(+moveStep);
            });
        }

        if (btnDown != null)
        {
            btnDown.onClick.RemoveAllListeners();
            btnDown.onClick.AddListener(() =>
            {
                PlayClick();
                FastFall();
            });
        }

        if (backButton != null)
        {
            backButton.onClick.RemoveAllListeners();
            backButton.onClick.AddListener(() =>
            {
                PlayClick();
                SaveProgress();
                GoBack();
            });
        }
    }

    void GoBack()
    {
        if (!string.IsNullOrEmpty(backSceneName))
            SceneManager.LoadScene(backSceneName);
        else
            Debug.LogWarning("backSceneName boş!");
    }

    // ======================================================
    void CacheSlotData()
    {
        if (fallingBlock != null)
            originalBlockScale = fallingBlock.localScale;

        if (translationSlots == null) return;

        originalSlotScales = new Vector3[translationSlots.Length];
        originalSlotPositions = new Vector2[translationSlots.Length];
        slotCoroutines = new Coroutine[translationSlots.Length];

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

            originalSlotScales[i] = translationSlots[i].localScale;
            originalSlotPositions[i] = translationSlots[i].anchoredPosition;
        }
    }

    void ResetSlotVisuals()
    {
        if (translationSlots == null) return;

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

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

            Image img = translationSlots[i].GetComponent<Image>();

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

            if (originalSlotScales != null && i < originalSlotScales.Length)
                translationSlots[i].localScale = originalSlotScales[i];

            if (originalSlotPositions != null && i < originalSlotPositions.Length)
                translationSlots[i].anchoredPosition = originalSlotPositions[i];
        }
    }

    // ======================================================
    void LoadWords()
    {
        fullDeck.Clear();

        if (wordsTxt == null)
        {
            Debug.LogError("wordsTxt atanmadı!");
            return;
        }

        string[] lines = wordsTxt.text.Split('\n');

        foreach (string rawLine in lines)
        {
            string line = rawLine.Trim();

            if (string.IsNullOrWhiteSpace(line))
                continue;

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

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

            fullDeck.Add(new WordEntry
            {
                tr = p[0].Trim(),
                en = p[1].Trim(),
                es = p[2].Trim(),
                de = p[3].Trim(),
                fr = p[4].Trim(),
                pt = p[5].Trim()
            });
        }
    }

    // ======================================================
    void SpawnNewWord()
    {
        if (gameOver) return;

        processing = false;
        ResetSlotVisuals();

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

        if (deckIndex >= fullDeck.Count)
        {
            Shuffle(fullDeck);
            deckIndex = 0;
            lastWordKey = "";
        }

        currentWord = fullDeck[deckIndex];

        if (currentWord.Key == lastWordKey && fullDeck.Count > 1)
        {
            int rnd = Random.Range(0, fullDeck.Count);
            currentWord = fullDeck[rnd];
            deckIndex = rnd + 1;

            if (deckIndex >= fullDeck.Count)
                deckIndex = 0;
        }
        else
        {
            deckIndex++;
        }

        lastWordKey = currentWord.Key;

        string questionWord = GetWordByLang(currentWord, questionLangCode);
        correctAnswer = GetWordByLang(currentWord, answerLangCode);

        // ✅ Yukarıdan soru dili gelir
        fallingText.text = questionWord;

        if (fallingBlock != null)
        {
            fallingBlock.anchoredPosition = new Vector2(0, spawnY);
            fallingBlock.localScale = originalBlockScale;
        }

        // ✅ Alttaki seçenekler İngilizce gelir
        SetupTranslationSlots(correctAnswer);

        if (blockSpawnCo != null)
            StopCoroutine(blockSpawnCo);

        if (blockReactCo != null)
            StopCoroutine(blockReactCo);

        blockSpawnCo = StartCoroutine(BlockSpawnAnim());
    }

    void SetupTranslationSlots(string correct)
    {
        List<string> choices = new List<string>();
        choices.Add(correct);

        int guard = 0;

        while (choices.Count < 4 && guard < 500)
        {
            guard++;

            WordEntry randomWord = fullDeck[Random.Range(0, fullDeck.Count)];
            string candidate = GetWordByLang(randomWord, answerLangCode);

            if (!string.IsNullOrWhiteSpace(candidate) && !choices.Contains(candidate))
                choices.Add(candidate);
        }

        while (choices.Count < 4)
            choices.Add("-");

        Shuffle(choices);

        for (int i = 0; i < 4; i++)
        {
            if (translationSlotTexts[i] != null)
                translationSlotTexts[i].text = choices[i];

            if (translationSlots[i] != null)
            {
                translationSlots[i].name = choices[i];

                Image img = translationSlots[i].GetComponent<Image>();

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

    // ======================================================
    void Move(float x)
    {
        if (processing || gameOver || fallingBlock == null) return;

        Vector2 pos = fallingBlock.anchoredPosition;
        pos.x = Mathf.Clamp(pos.x + x, minX, maxX);
        fallingBlock.anchoredPosition = pos;
    }

    void FastFall()
    {
        if (processing || gameOver || fallingBlock == null) return;

        fallingBlock.anchoredPosition += Vector2.down * fastFallStep;
        CheckCollision();
    }

    // ======================================================
    void CheckCollision()
    {
        if (processing || gameOver) return;
        if (fallingBlock == null || translationSlots == null || translationSlots.Length < 4) return;

        float slotY = translationSlots[0].anchoredPosition.y;
        float blockY = fallingBlock.anchoredPosition.y;
        float halfH = fallingBlock.rect.height * 0.5f;

        if (blockY - halfH <= slotY)
        {
            int idx = DetectSlot(fallingBlock.anchoredPosition.x);

            if (idx == -1)
            {
                Wrong("miss");
                return;
            }

            Evaluate(idx);
            return;
        }

        if (blockY + halfH < bottomLimitY)
            Wrong("out");
    }

    int DetectSlot(float x)
    {
        for (int i = 0; i < 4; i++)
        {
            if (translationSlots[i] == null) continue;

            float sx = translationSlots[i].anchoredPosition.x;
            float half = translationSlots[i].rect.width * 0.5f;

            if (x >= sx - half && x <= sx + half)
                return i;
        }

        return -1;
    }

    // ======================================================
    void Evaluate(int slotIndex)
    {
        if (processing || gameOver) return;

        processing = true;

        string selectedAnswer = "";

        if (translationSlotTexts[slotIndex] != null)
            selectedAnswer = translationSlotTexts[slotIndex].text;

        bool correct = selectedAnswer == correctAnswer;

        if (correct)
            HandleCorrect(slotIndex);
        else
            HandleWrong(slotIndex);

        UpdateUI();
        SaveProgress();

        Invoke(nameof(SpawnNewWord), nextWordDelay);
    }

    void HandleCorrect(int slotIndex)
    {
        score += correctBaseScore + combo * comboBonus;

        combo++;
        correctCount++;

        if (combo > bestComboThisRun)
            bestComboThisRun = combo;

        Image img = translationSlots[slotIndex].GetComponent<Image>();

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

        PlayCorrect();

        SetFeedback(LocalizeFeedback("correct") + " +" + correctBaseScore, feedbackCorrectColor);

        StartSlotAnim(slotIndex, SlotPulse(slotIndex));

        if (blockReactCo != null)
            StopCoroutine(blockReactCo);

        blockReactCo = StartCoroutine(BlockCorrectAnim());
    }

    void HandleWrong(int slotIndex)
    {
        score = Mathf.Max(0, score - wrongPenalty);

        combo = 0;
        wrongCount++;

        Image selectedImg = translationSlots[slotIndex].GetComponent<Image>();

        if (selectedImg != null)
            selectedImg.color = FullAlpha(wrongSlotColor);

        for (int i = 0; i < 4; i++)
        {
            if (translationSlotTexts[i] == null || translationSlots[i] == null)
                continue;

            if (translationSlotTexts[i].text == correctAnswer)
            {
                Image correctImg = translationSlots[i].GetComponent<Image>();

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

                StartSlotAnim(i, SlotPulse(i));
            }
        }

        PlayWrong();

        SetFeedback(LocalizeFeedback("wrong") + " | " + correctAnswer, feedbackWrongColor);

        StartSlotAnim(slotIndex, ShakeSlot(slotIndex));

        if (blockReactCo != null)
            StopCoroutine(blockReactCo);

        blockReactCo = StartCoroutine(BlockWrongAnim());
    }

    void Wrong(string reason)
    {
        if (processing || gameOver) return;

        processing = true;

        score = Mathf.Max(0, score - wrongPenalty);

        combo = 0;
        wrongCount++;

        PlayWrong();

        SetFeedback(LocalizeFeedback(reason), feedbackWrongColor);

        if (blockReactCo != null)
            StopCoroutine(blockReactCo);

        blockReactCo = StartCoroutine(BlockWrongAnim());

        UpdateUI();
        SaveProgress();

        Invoke(nameof(SpawnNewWord), nextWordDelay);
    }

    // ======================================================
    void UpdateUI()
    {
        if (scoreText != null)
            scoreText.text = score.ToString();

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

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

        timerText.text = Mathf.CeilToInt(timer).ToString();

        if (timer <= 10f)
        {
            timerText.color = FullAlpha(Color.Lerp(timerWarningColor, 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 SetFeedback(string msg, Color c)
    {
        if (feedbackText == null) return;

        feedbackText.text = msg;
        feedbackText.color = FullAlpha(c);

        if (feedbackCo != null)
            StopCoroutine(feedbackCo);

        feedbackCo = StartCoroutine(FeedbackPop());
    }

    IEnumerator FeedbackPop()
    {
        if (feedbackText == null) yield break;

        Vector3 normal = Vector3.one;
        Vector3 big = Vector3.one * 1.14f;

        float t = 0f;

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

        t = 0f;

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

        feedbackText.transform.localScale = normal;
        feedbackCo = null;
    }

    // ======================================================
    void SaveProgress()
    {
        PlayerPrefs.SetInt("Mod7Skor", score);
        PlayerPrefs.SetInt("Mod7Score", score);
        PlayerPrefs.SetInt("Mod7_LastScore", score);
        PlayerPrefs.SetInt("Mod7_Correct", correctCount);
        PlayerPrefs.SetInt("Mod7_Wrong", wrongCount);
        PlayerPrefs.SetInt("Mod7_LastCombo", combo);
        PlayerPrefs.SetInt("Mod7_BestComboRun", bestComboThisRun);
        PlayerPrefs.SetInt("Mod7_LastTimeLeft", Mathf.CeilToInt(timer));

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

        PlayerPrefs.SetInt("Mod7_LastAccuracy", accuracy);

        int oldMax = PlayerPrefs.GetInt("Mod7_MaxScore", 0);

        if (score > oldMax)
            PlayerPrefs.SetInt("Mod7_MaxScore", score);

        int oldBestCombo = PlayerPrefs.GetInt("Mod7_BestCombo", 0);

        if (bestComboThisRun > oldBestCombo)
            PlayerPrefs.SetInt("Mod7_BestCombo", bestComboThisRun);

        PlayerPrefs.Save();
    }

    void GameOver()
    {
        if (gameOver) return;

        gameOver = true;
        processing = true;

        SaveProgress();

        PlayerPrefs.SetString("LastPlayedMod", modKey);

        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();

        if (!string.IsNullOrEmpty(resultSceneName))
            SceneManager.LoadScene(resultSceneName);
        else
            Debug.LogWarning("resultSceneName boş!");
    }

    // ======================================================
    void StartSlotAnim(int slotIndex, IEnumerator routine)
    {
        if (slotCoroutines == null) return;
        if (slotIndex < 0 || slotIndex >= slotCoroutines.Length) return;

        if (slotCoroutines[slotIndex] != null)
            StopCoroutine(slotCoroutines[slotIndex]);

        slotCoroutines[slotIndex] = StartCoroutine(routine);
    }

    IEnumerator SlotPulse(int slotIndex)
    {
        if (translationSlots == null) yield break;
        if (slotIndex < 0 || slotIndex >= translationSlots.Length) yield break;
        if (translationSlots[slotIndex] == null) yield break;

        Vector3 normal = originalSlotScales[slotIndex];
        Vector3 big = normal * slotPulseScale;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / Mathf.Max(0.01f, slotPulseTime);
            translationSlots[slotIndex].localScale = Vector3.Lerp(normal, big, EaseOutQuad(t));
            yield return null;
        }

        t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / Mathf.Max(0.01f, slotPulseTime);
            translationSlots[slotIndex].localScale = Vector3.Lerp(big, normal, EaseOutQuad(t));
            yield return null;
        }

        translationSlots[slotIndex].localScale = normal;
        slotCoroutines[slotIndex] = null;
    }

    IEnumerator ShakeSlot(int slotIndex)
    {
        if (translationSlots == null) yield break;
        if (slotIndex < 0 || slotIndex >= translationSlots.Length) yield break;
        if (translationSlots[slotIndex] == null) yield break;

        Vector2 origin = originalSlotPositions[slotIndex];

        float elapsed = 0f;

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

            translationSlots[slotIndex].anchoredPosition = origin + new Vector2(x, 0f);

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

        translationSlots[slotIndex].anchoredPosition = origin;
        slotCoroutines[slotIndex] = null;
    }

    IEnumerator BlockSpawnAnim()
    {
        if (fallingBlock == null) yield break;

        Vector3 target = originalBlockScale;
        Vector3 small = originalBlockScale * blockSpawnScale;

        fallingBlock.localScale = small;

        float t = 0f;

        while (t < 1f)
        {
            t += Time.deltaTime / Mathf.Max(0.01f, blockSpawnAnimTime);
            fallingBlock.localScale = Vector3.Lerp(small, target, EaseOutBack(t));
            yield return null;
        }

        fallingBlock.localScale = target;
    }

    IEnumerator BlockCorrectAnim()
    {
        if (fallingBlock == null) yield break;

        Vector3 normal = originalBlockScale;
        Vector3 big = originalBlockScale * 1.08f;

        float t = 0f;

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

        t = 0f;

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

        fallingBlock.localScale = normal;
    }

    IEnumerator BlockWrongAnim()
    {
        if (fallingBlock == null) yield break;

        Vector2 origin = fallingBlock.anchoredPosition;

        float elapsed = 0f;
        float duration = 0.28f;

        while (elapsed < duration)
        {
            float power = 1f - elapsed / duration;
            float x = Random.Range(-1f, 1f) * 14f * power;

            fallingBlock.anchoredPosition = origin + new Vector2(x, 0f);

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

        fallingBlock.anchoredPosition = origin;
    }

    // ======================================================
    void PlayClick()
    {
        if (sfxSource != null && clickClip != null)
            sfxSource.PlayOneShot(clickClip);
    }

    void PlayCorrect()
    {
        if (sfxSource != null && correctClip != null)
            sfxSource.PlayOneShot(correctClip);
    }

    void PlayWrong()
    {
        if (sfxSource != null && wrongClip != null)
            sfxSource.PlayOneShot(wrongClip);
    }

    // ======================================================
    string GetQuestionLanguage()
    {
        string q = PlayerPrefs.GetString("QuestionLangCode", "");
        q = NormalizeLang(q);

        if (!string.IsNullOrWhiteSpace(q) && q != "en")
            return q;

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

        if (appId >= 0)
        {
            string appLang = LangIdToCode(appId);

            if (appLang != "en")
                return appLang;
        }

        string appString = NormalizeLang(PlayerPrefs.GetString("AppLanguage", "tr"));

        if (appString != "en")
            return appString;

        return "tr";
    }

    string GetUILanguage()
    {
        int appId = PlayerPrefs.GetInt("AppLanguage", -1);

        if (appId >= 0)
            return LangIdToCode(appId);

        return NormalizeLang(PlayerPrefs.GetString("AppLanguage", "en"));
    }

    string LangIdToCode(int id)
    {
        return id switch
        {
            0 => "tr",
            2 => "es",
            3 => "de",
            4 => "fr",
            5 => "pt",
            _ => "en"
        };
    }

    string NormalizeLang(string raw)
    {
        if (string.IsNullOrEmpty(raw))
            return "en";

        raw = raw.Trim().ToLower();

        if (raw == "tr" || raw == "turkish" || raw == "tr-tr")
            return "tr";

        if (raw == "en" || raw == "english" || raw.StartsWith("en-"))
            return "en";

        if (raw == "es" || raw == "spanish" || raw == "es-es")
            return "es";

        if (raw == "de" || raw == "german" || raw == "de-de")
            return "de";

        if (raw == "fr" || raw == "french" || raw == "fr-fr")
            return "fr";

        if (raw == "pt" || raw == "portuguese" || raw == "pt-pt" || raw == "pt-br")
            return "pt";

        return "en";
    }

    string GetWordByLang(WordEntry w, string lang)
    {
        return lang switch
        {
            "tr" => w.tr,
            "es" => w.es,
            "de" => w.de,
            "fr" => w.fr,
            "pt" => w.pt,
            _ => w.en
        };
    }

    string LocalizeFeedback(string key)
    {
        return key switch
        {
            "correct" => uiLangCode switch
            {
                "tr" => "Doğru!",
                "es" => "¡Correcto!",
                "de" => "Richtig!",
                "fr" => "Correct!",
                "pt" => "Correto!",
                _ => "Correct!"
            },

            "wrong" => uiLangCode switch
            {
                "tr" => "Yanlış!",
                "es" => "¡Incorrecto!",
                "de" => "Falsch!",
                "fr" => "Faux!",
                "pt" => "Errado!",
                _ => "Wrong!"
            },

            "miss" => uiLangCode switch
            {
                "tr" => "Kaçırdın!",
                "es" => "Fallaste!",
                "de" => "Verpasst!",
                "fr" => "Raté!",
                "pt" => "Perdeu!",
                _ => "Miss!"
            },

            "out" => uiLangCode switch
            {
                "tr" => "Ekran dışı!",
                "es" => "Fuera!",
                "de" => "Außerhalb!",
                "fr" => "Hors écran!",
                "pt" => "Fora!",
                _ => "Out!"
            },

            _ => key
        };
    }

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

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

    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);
    }

    void Shuffle<T>(List<T> list)
    {
        for (int i = list.Count - 1; i > 0; i--)
        {
            int r = Random.Range(0, i + 1);
            T temp = list[i];
            list[i] = list[r];
            list[r] = temp;
        }
    }
}