// static/script.js

// Timestamp generator for downloaded files: YYYYMMDD_HHMM_XXXXXX
function getTimestampedFileName(baseName) {
    const now = new Date();
    const year = now.getFullYear();
    const month = String(now.getMonth() + 1).padStart(2, '0');
    const day = String(now.getDate()).padStart(2, '0');
    const hours = String(now.getHours()).padStart(2, '0');
    const minutes = String(now.getMinutes()).padStart(2, '0');
    return `${year}${month}${day}_${hours}${minutes}_${baseName}`;
}

document.addEventListener('DOMContentLoaded', () => {

    // 常用單字速查快卡資料庫
    const PHRASES = [
        { zh: "你好", desc: "日常招呼" },
        { zh: "謝謝你", desc: "表達感恩" },
        { zh: "再見", desc: "告別祝願" },
        { zh: "加油", desc: "鼓舞打氣" },
        { zh: "早安", desc: "晨間問候" },
        { zh: "晚安", desc: "夜間問候" },
        { zh: "吃飽了嗎？", desc: "關心問候" },
        { zh: "很高興認識你", desc: "禮貌交友" },
        { zh: "請問這個多少錢？", desc: "購物問價" },
        { zh: "祝你幸運成功", desc: "祝福" }
    ];

    // 全域變數
    let currentTribe = "太魯閣";
    let currentMode = "zh_to_native"; // 預設：華 ➔ 族
    let lastSourceText = "";
    let lastTargetText = "";
    let lastNativeText = "";
    let lastChineseText = "";
    let lastDirection = "zh_to_native";
    let currentAudio = null;
    let mediaRecorder = null;
    let audioChunks = [];

    // --- DOM 元件獲取 ---
    const tribeSelect = document.getElementById('tribeSelect');
    const textInput = document.getElementById('textInput');
    const textOutput = document.getElementById('textOutput');
    const charCount = document.getElementById('charCount');
    const speedTimer = document.getElementById('speedTimer');
    const translateBtn = document.getElementById('translateBtn');
    const ttsBtn = document.getElementById('ttsBtn');
    const deepTranslateBtn = document.getElementById('deepTranslateBtn');
    const copyBtn = document.getElementById('copyBtn');
    const confidenceBadge = document.getElementById('confidenceBadge');
    const confidenceLevel = document.getElementById('confidenceLevel');
    const confidenceDesc = document.getElementById('confidenceDesc');
    const phrasesGrid = document.getElementById('phrasesGrid');
    const historyList = document.getElementById('historyList');

    // 1. 初始化 10 句速查快卡
    function initPhrasebook() {
        phrasesGrid.innerHTML = '';
        PHRASES.forEach(p => {
            const card = document.createElement('div');
            card.className = 'phrase-card';
            card.innerHTML = `
                <div class="phrase-zh">${p.zh}</div>
                <div class="phrase-desc">${p.desc}</div>
            `;
            card.addEventListener('click', () => {
                textInput.value = p.zh;
                updateCharCount();
                updateDirBtnsUI('zh_to_native');
                handleTranslate();
            });
            phrasesGrid.appendChild(card);
        });
    }

    // 2. Tab 切換邏輯
    const tabBtns = document.querySelectorAll('.tab-btn');
    const tabContents = document.querySelectorAll('.tab-content');

    tabBtns.forEach(btn => {
        btn.addEventListener('click', () => {
            tabBtns.forEach(b => b.classList.remove('active'));
            tabContents.forEach(c => c.classList.remove('active'));

            btn.classList.add('active');
            const targetTab = btn.getAttribute('data-tab');
            document.getElementById(targetTab).classList.add('active');
        });
    });

    // 3. 翻譯方向模式按鈕處理
    const dirBtns = document.querySelectorAll('.dir-btn');
    function updateDirBtnsUI(mode) {
        currentMode = mode;
        dirBtns.forEach(btn => {
            if (btn.getAttribute('data-mode') === mode) {
                btn.classList.add('active');
            } else {
                btn.classList.remove('active');
            }
        });

        const inputBoxTitle = document.getElementById('inputBoxTitle');
        if (inputBoxTitle) {
            if (mode === 'zh_to_native') {
                inputBoxTitle.innerHTML = '<i class="fa-regular fa-pen-to-square"></i> 原文輸入 (華)';
                textInput.placeholder = `請在此輸入華，將自動翻譯為【${currentTribe}】...`;
            } else if (mode === 'native_to_zh') {
                inputBoxTitle.innerHTML = `<i class="fa-regular fa-pen-to-square"></i> 原文輸入 (${currentTribe})`;
                textInput.placeholder = `請在此輸入【${currentTribe}】，將自動翻譯為華...`;
            } else {
                inputBoxTitle.innerHTML = '<i class="fa-regular fa-pen-to-square"></i> 原文輸入 (自動判斷)';
                textInput.placeholder = `請在此輸入句子，系統將自動判斷方向...`;
            }
        }
    }

    dirBtns.forEach(btn => {
        btn.addEventListener('click', () => {
            const mode = btn.getAttribute('data-mode');
            updateDirBtnsUI(mode);
            if (textInput.value.trim().length > 0) {
                handleTranslate();
            }
        });
    });

    // 4. 族切換同步
    tribeSelect.addEventListener('change', (e) => {
        currentTribe = e.target.value;
        document.querySelectorAll('.current-tribe-label').forEach(el => el.textContent = currentTribe);
        updateDirBtnsUI(currentMode);

        if (textInput.value.trim().length > 0) {
            if (currentMode === 'zh_to_native') {
                // 華翻族：切換族時自動將原華翻譯為新族
                handleTranslate();
            } else {
                // 族翻華：切換族時，原族已不符新選族，直接清空避免誤會
                textInput.value = '';
                textOutput.textContent = '';
                textOutput.classList.add('empty');
                lastTargetText = '';
                updateCharCount();
                
                // 隱藏信心值與功能按鈕
                confidenceBadge.style.display = 'none';
                ttsBtn.disabled = true;
                deepTranslateBtn.disabled = true;
                copyBtn.disabled = true;
            }
        }
    });

    // 5. 字數統計與上限限制
    function updateCharCount() {
        const len = textInput.value.length;
        charCount.textContent = `${len} 字`;
        charCount.style.color = 'var(--text-muted)';
    }
    textInput.addEventListener('input', updateCharCount);

    // 6. 執行文字翻譯 (POST /api/translate)
    async function handleTranslate() {
        const text = textInput.value.trim();
        if (!text) return;

        if (text.length > 300) {
            alert('您的翻譯字數超過300字，會需要一些翻譯等待時間，敬請稍後。');
        }

        translateBtn.disabled = true;
        translateBtn.innerHTML = '<span class="loading-spinner"></span> 翻譯中...';
        textOutput.classList.remove('empty');
        textOutput.textContent = 'AI 正向遠端 API 請求翻譯中...';

        const startTime = performance.now();

        try {
            const res = await fetch('/api/translate', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ text: text, tribe: currentTribe, mode: currentMode })
            });
            const data = await res.json();

            const endTime = performance.now();
            const durationSec = ((endTime - startTime) / 1000).toFixed(1);
            speedTimer.innerHTML = `<i class="fa-regular fa-clock"></i> 耗時: ${durationSec}s`;

            if (data.error) {
                textOutput.textContent = `❌ ${data.error}`;
                return;
            }

            lastSourceText = text;
            lastTargetText = data.target;
            lastDirection = data.direction || 'zh_to_native';
            lastNativeText = (data.direction === 'native_to_zh') ? text : data.target;
            lastChineseText = (data.direction === 'native_to_zh') ? data.target : text;

            textOutput.textContent = data.target;

            // 啟用按鈕
            ttsBtn.disabled = false;
            deepTranslateBtn.disabled = false;
            copyBtn.disabled = false;

            // 顯示信心值與翻譯方向標籤
            const dirLabel = data.direction === 'native_to_zh' ? `${currentTribe} ➔ 華` : `華 ➔ ${currentTribe}`;
            confidenceBadge.style.display = 'inline-flex';
            confidenceBadge.className = `badge-confidence ${data.confidence_level || 'high'}`;
            confidenceLevel.textContent = data.confidence_level === 'low' ? '低' : (data.confidence_level === 'medium' ? '中' : '高');
            confidenceDesc.textContent = `【${dirLabel}】 ${data.confidence_desc || '一般生活句'}`;

            // 記錄至本地歷史紀錄
            saveToHistory(text, data.target, currentTribe);

        } catch (err) {
            textOutput.textContent = `❌ 網路請求失敗: ${err.message}`;
        } finally {
            translateBtn.disabled = false;
            translateBtn.innerHTML = '<i class="fa-solid fa-paper-plane"></i> 開始極速翻譯';
        }
    }

    translateBtn.addEventListener('click', handleTranslate);

    // 雙向對調按鈕事件
    const swapDirectionBtn = document.getElementById('swapDirectionBtn');
    if (swapDirectionBtn) {
        swapDirectionBtn.addEventListener('click', () => {
            if (currentMode === 'zh_to_native') {
                updateDirBtnsUI('native_to_zh');
            } else if (currentMode === 'native_to_zh') {
                updateDirBtnsUI('zh_to_native');
            }
            if (lastTargetText) {
                textInput.value = lastTargetText;
                updateCharCount();
                handleTranslate();
            } else if (textInput.value.trim()) {
                handleTranslate();
            }
        });
    }


    // Enter 鍵按快捷翻譯 (Shift+Enter 換行)
    textInput.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' && !e.shiftKey) {
            e.preventDefault();
            handleTranslate();
        }
    });

    // 6. 🔊 聽發音 (POST /api/tts - 傳送族文字)
    ttsBtn.addEventListener('click', async () => {
        const nativeTextToSpeak = lastNativeText || (lastDirection === 'native_to_zh' ? lastSourceText : lastTargetText);
        if (!nativeTextToSpeak) return;

        ttsBtn.disabled = true;
        ttsBtn.innerHTML = '<span class="loading-spinner"></span> 合成中...';

        try {
            const res = await fetch('/api/tts', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ text: nativeTextToSpeak, tribe: currentTribe })
            });
            const data = await res.json();

            if (data.audio_url) {
                if (currentAudio) currentAudio.pause();
                currentAudio = new Audio(data.audio_url);
                currentAudio.play();
            } else {
                alert('⚠️ 音合成失敗：' + (data.error || '未知錯誤'));
            }
        } catch (err) {
            alert('❌ 音服務請求失敗');
        } finally {
            ttsBtn.disabled = false;
            ttsBtn.innerHTML = '<i class="fa-solid fa-volume-high"></i> 🔊 聽發音';
        }
    });

    // 8. 🧠 深度文化潤飾與 API Key 管理
    const apiKeyModal = document.getElementById('apiKeyModal');
    const closeApiKeyModalBtn = document.getElementById('closeApiKeyModalBtn');
    const cancelApiKeyBtn = document.getElementById('cancelApiKeyBtn');
    const confirmApiKeyBtn = document.getElementById('confirmApiKeyBtn');
    const geminiApiKeyInput = document.getElementById('geminiApiKeyInput');
    const rememberApiKeyCheckbox = document.getElementById('rememberApiKeyCheckbox');
    const changeApiKeyBtn = document.getElementById('changeApiKeyBtn');

    let pendingDeepTranslateResolve = null;

    function promptForApiKey() {
        return new Promise((resolve) => {
            pendingDeepTranslateResolve = resolve;
            const savedKey = localStorage.getItem('gemini_api_key') || '';
            if (geminiApiKeyInput) {
                geminiApiKeyInput.value = savedKey;
                setTimeout(() => geminiApiKeyInput.focus(), 100);
            }
            if (apiKeyModal) apiKeyModal.style.display = 'flex';
        });
    }

    function closeApiKeyModal(apiKey = null) {
        if (apiKeyModal) apiKeyModal.style.display = 'none';
        if (pendingDeepTranslateResolve) {
            pendingDeepTranslateResolve(apiKey);
            pendingDeepTranslateResolve = null;
        }
    }

    if (closeApiKeyModalBtn) closeApiKeyModalBtn.addEventListener('click', () => closeApiKeyModal(null));
    if (cancelApiKeyBtn) cancelApiKeyBtn.addEventListener('click', () => closeApiKeyModal(null));

    function handleApiKeySubmit() {
        const key = geminiApiKeyInput.value.trim();
        if (!key) {
            alert('⚠️ 請輸入有效的 API Key');
            return;
        }
        if (rememberApiKeyCheckbox && rememberApiKeyCheckbox.checked) {
            localStorage.setItem('gemini_api_key', key);
        } else {
            localStorage.removeItem('gemini_api_key');
        }
        closeApiKeyModal(key);
    }

    if (confirmApiKeyBtn) {
        confirmApiKeyBtn.addEventListener('click', handleApiKeySubmit);
    }

    if (geminiApiKeyInput) {
        geminiApiKeyInput.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') {
                e.preventDefault();
                handleApiKeySubmit();
            }
        });
    }

    if (changeApiKeyBtn) {
        changeApiKeyBtn.addEventListener('click', async () => {
            const deepModal = document.getElementById('deepTranslateModal');
            if (deepModal) deepModal.style.display = 'none';
            const newKey = await promptForApiKey();
            if (newKey && lastSourceText && lastTargetText) {
                await executeDeepTranslate(newKey);
            }
        });
    }

    async function executeDeepTranslate(apiKeyToUse) {
        deepTranslateBtn.disabled = true;
        deepTranslateBtn.innerHTML = '<span class="loading-spinner"></span> 潤飾中...';

        try {
            const res = await fetch('/api/deep_translate', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ 
                    source_text: lastSourceText, 
                    target_text: lastTargetText, 
                    tribe: currentTribe,
                    api_key: apiKeyToUse 
                })
            });
            const data = await res.json();

            if (data.result) {
                const bodyElem = document.getElementById('deepTranslateResultBody');
                const modal = document.getElementById('deepTranslateModal');
                
                // 🎯 使用後端 is_api_key_error 旗標（精準、不依賴字串比對）
                if (data.is_api_key_error === true) {
                    localStorage.removeItem('gemini_api_key');
                    // 直接寫入 innerHTML，用 onclick 屬性綁定事件（最穩定的方式，不依賴 addEventListener）
                    bodyElem.innerHTML = [
                        '<div style="background:rgba(245,158,11,0.15);border:2px solid rgba(245,158,11,0.6);padding:24px;border-radius:14px;text-align:center;">',
                        '<div style="font-size:2.5rem;margin-bottom:12px;">⚠️</div>',
                        '<div style="color:#fbbf24;font-size:1.2rem;font-weight:700;margin-bottom:12px;">【API Key 驗證失敗】</div>',
                        '<div style="color:#fef3c7;font-size:0.95rem;line-height:1.7;margin-bottom:20px;">',
                        '您的 Google Gemini API Key 無效或已過期。<br>請點擊下方按鈕重新輸入有效金鑰。',
                        '</div>',
                        '<button onclick="window.__changeApiKey__()" style="background:#f59e0b;color:#000;font-weight:800;border:none;padding:14px 28px;border-radius:10px;cursor:pointer;font-size:1rem;box-shadow:0 4px 20px rgba(245,158,11,0.5);">',
                        '🔑 點此立即更換 API Key',
                        '</button>',
                        '</div>'
                    ].join('');
                } else {
                    bodyElem.textContent = data.result;
                }
                
                modal.style.display = 'flex';
            } else {
                alert('⚠️ 深度翻譯服務未回傳結果');
            }
        } catch (err) {
            alert('❌ 深度翻譯請求失敗');
        } finally {
            deepTranslateBtn.disabled = false;
            deepTranslateBtn.innerHTML = '<i class="fa-solid fa-brain"></i> 🧠 深度文化潤飾';
        }
    }

    // 🌐 全域函式：讓 onclick 屬性能呼叫到 promptForApiKey
    window.__changeApiKey__ = async function() {
        document.getElementById('deepTranslateModal').style.display = 'none';
        const newKey = await promptForApiKey();
        if (newKey && lastSourceText && lastTargetText) {
            await executeDeepTranslate(newKey);
        }
    };

    deepTranslateBtn.addEventListener('click', async () => {
        if (!lastSourceText || !lastTargetText) return;

        // 🎯 點擊「深度文化潤飾」時強制跳出 API Key 彈窗 (若有預存金鑰會自動帶入)
        const apiKey = await promptForApiKey();
        if (!apiKey) return; // 使用者按下取消

        await executeDeepTranslate(apiKey);
    });

    // 9. 複製結果
    copyBtn.addEventListener('click', () => {
        if (!lastTargetText) return;
        navigator.clipboard.writeText(lastTargetText).then(() => {
            const originalText = copyBtn.innerHTML;
            copyBtn.innerHTML = '<i class="fa-solid fa-check"></i> 已複製!';
            setTimeout(() => copyBtn.innerHTML = originalText, 2000);
        });
    });

    // 10. 🎙️ 音錄音與 ASR (POST /api/asr)
    const startRecordBtn = document.getElementById('startRecordBtn');
    const stopRecordBtn = document.getElementById('stopRecordBtn');
    const recordingStatus = document.getElementById('recordingStatus');
    const audioDropzone = document.getElementById('audioDropzone');
    const audioFileInput = document.getElementById('audioFileInput');
    const audioResult = document.getElementById('audioResult');
    const audioOutput = document.getElementById('audioOutput');

    startRecordBtn.addEventListener('click', async () => {
        try {
            const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
            mediaRecorder = new MediaRecorder(stream);
            audioChunks = [];

            mediaRecorder.ondataavailable = event => audioChunks.push(event.data);
            mediaRecorder.onstop = async () => {
                const audioBlob = new Blob(audioChunks, { type: 'audio/wav' });
                await sendAudioFile(audioBlob, 'recorded_audio.wav');
            };

            mediaRecorder.start();
            recordingStatus.style.display = 'block';
            startRecordBtn.disabled = true;
            stopRecordBtn.disabled = false;
        } catch (err) {
            alert('⚠️ 無法存取麥克風設備: ' + err.message);
        }
    });

    stopRecordBtn.addEventListener('click', () => {
        if (mediaRecorder && mediaRecorder.state !== 'inactive') {
            mediaRecorder.stop();
            recordingStatus.style.display = 'none';
            startRecordBtn.disabled = false;
            stopRecordBtn.disabled = true;
        }
    });

    audioDropzone.addEventListener('click', () => audioFileInput.click());
    audioFileInput.addEventListener('change', (e) => {
        if (e.target.files.length > 0) {
            sendAudioFile(e.target.files[0], e.target.files[0].name);
        }
    });

    async function sendAudioFile(blobOrFile, filename) {
        audioResult.style.display = 'block';
        audioOutput.textContent = '音音軌分析中，請稍候...';

        const formData = new FormData();
        formData.append('file', blobOrFile, filename);
        formData.append('tribe', currentTribe);

        try {
            const res = await fetch('/api/asr', { method: 'POST', body: formData });
            const data = await res.json();
            if (data.error) {
                audioOutput.textContent = `❌ ${data.error}`;
            } else {
                audioOutput.innerHTML = `
                    <div><strong>辨識文字：</strong> ${data.source || '無文本'}</div>
                    <div style="margin-top: 8px; color: var(--primary-cyan);"><strong>【${currentTribe}翻譯】：</strong> ${data.target || '無翻譯'}</div>
                `;
            }
        } catch (err) {
            audioOutput.textContent = `❌ 音分析傳送失敗: ${err.message}`;
        }
    }

    // 11. 🖼️ 圖片 OCR 翻譯 (POST /api/ocr)
    const imageDropzone = document.getElementById('imageDropzone');
    const imageFileInput = document.getElementById('imageFileInput');
    const imageResult = document.getElementById('imageResult');
    const imageOutput = document.getElementById('imageOutput');

    imageDropzone.addEventListener('click', () => imageFileInput.click());
    imageFileInput.addEventListener('change', (e) => {
        if (e.target.files.length > 0) {
            sendImageFile(e.target.files[0]);
        }
    });

    async function sendImageFile(file) {
        imageResult.style.display = 'block';
        imageOutput.textContent = 'Gemini 視覺模型解析圖片中...';

        // 顯示圖片預覽
        const imagePreviewContainer = document.getElementById('imagePreviewContainer');
        const imagePreview = document.getElementById('imagePreview');
        const reader = new FileReader();
        reader.onload = function(e) {
            imagePreview.src = e.target.result;
            imagePreviewContainer.style.display = 'block';
        };
        reader.readAsDataURL(file);

        let currentOcrItems = [];

        const formData = new FormData();
        formData.append('file', file);
        formData.append('tribe', currentTribe);

        try {
            const res = await fetch('/api/ocr', { method: 'POST', body: formData });
            const data = await res.json();

            if (data.items && data.items.length > 0) {
                currentOcrItems = data.items;
                imageOutput.innerHTML = '';
                data.items.forEach(item => {
                    const card = document.createElement('div');
                    card.style.cssText = 'background: rgba(0,0,0,0.4); padding: 12px; border-radius: 8px; border-left: 3px solid var(--primary-cyan);';
                    card.innerHTML = `
                        <div style="color: var(--text-muted); font-size: 0.85rem;">原圖文字: ${item.original}</div>
                        <div style="color: var(--primary-cyan); font-weight: 600; font-size: 1.1rem; margin-top: 4px;">譯文: ${item.translated}</div>
                    `;
                    imageOutput.appendChild(card);
                });
            } else {
                imageOutput.textContent = '⚠️ 未能在圖片中辨識出有效文字，或 OCR 回傳空值。';
            }
        } catch (err) {
            imageOutput.textContent = `❌ 圖片上傳解析失敗: ${err.message}`;
        }
    }

    // 複製 OCR 結果
    const copyOcrBtn = document.getElementById('copyOcrBtn');
    if(copyOcrBtn) {
        copyOcrBtn.addEventListener('click', () => {
            const outputText = Array.from(imageOutput.children)
                .filter(card => card.tagName.toLowerCase() === 'div')
                .map(card => {
                    const orig = card.querySelector('div:nth-child(1)').textContent.replace('原圖文字: ', '');
                    const trans = card.querySelector('div:nth-child(2)').textContent.replace('譯文: ', '');
                    return `【原圖文字】: ${orig}\n【太魯閣翻譯】: ${trans}`;
                }).join('\n\n');
            
            if (!outputText) return;
            navigator.clipboard.writeText(outputText);
            const originalText = copyOcrBtn.innerHTML;
            copyOcrBtn.innerHTML = '<i class="fa-solid fa-check"></i> 已複製';
            setTimeout(() => copyOcrBtn.innerHTML = originalText, 2000);
        });
    }

    // 下載 OCR WORD
    const downloadOcrWordBtn = document.getElementById('downloadOcrWordBtn');
    if(downloadOcrWordBtn) {
        downloadOcrWordBtn.addEventListener('click', () => {
            const outputText = Array.from(imageOutput.children)
                .filter(card => card.tagName.toLowerCase() === 'div')
                .map(card => {
                    const orig = card.querySelector('div:nth-child(1)').textContent.replace('原圖文字: ', '');
                    const trans = card.querySelector('div:nth-child(2)').textContent.replace('譯文: ', '');
                    return `<p style="font-family: Arial, sans-serif; font-size: 14pt; color: #555;">【原圖文字】: ${orig}</p>
                            <p style="font-family: Arial, sans-serif; font-size: 16pt; color: #008080; font-weight: bold; margin-bottom: 20px;">【太魯閣翻譯】: ${trans}</p>`;
                }).join('');
            
            if (!outputText) return;
            const htmlContent = `
                <html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:w='urn:schemas-microsoft-com:office:word' xmlns='http://www.w3.org/TR/REC-html40'>
                <head><meta charset='utf-8'><title>OCR 翻譯結果</title></head>
                <body>
                    <h1 style="text-align: center; color: #333;">圖片 OCR 翻譯結果</h1>
                    <hr>
                    ${outputText}
                </body>
                </html>
            `;
            const blob = new Blob(['\ufeff', htmlContent], { type: 'application/msword' });
            const url = URL.createObjectURL(blob);
            const link = document.createElement('a');
            link.href = url;
            link.download = getTimestampedFileName('圖片OCR翻譯結果.doc');
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
            URL.revokeObjectURL(url);
        });
    }

    // 12. 🎬 影片音軌翻譯 (POST /api/video)
    const videoDropzone = document.getElementById('videoDropzone');
    const videoFileInput = document.getElementById('videoFileInput');
    const videoResult = document.getElementById('videoResult');
    const videoOutput = document.getElementById('videoOutput');

    videoDropzone.addEventListener('click', () => videoFileInput.click());
    videoFileInput.addEventListener('change', (e) => {
        if (e.target.files.length > 0) {
            sendVideoFile(e.target.files[0]);
        }
    });

    let currentVideoData = null;

    // 格式化秒數為 SRT 時間軸 (HH:MM:SS,MMM)
    function formatSRTTime(seconds) {
        const date = new Date(0);
        date.setSeconds(Math.floor(seconds));
        const hh = String(date.getUTCHours()).padStart(2, '0');
        const mm = String(date.getUTCMinutes()).padStart(2, '0');
        const ss = String(date.getUTCSeconds()).padStart(2, '0');
        const mmm = String(Math.floor((seconds % 1) * 1000)).padStart(3, '0');
        return `${hh}:${mm}:${ss},${mmm}`;
    }

    async function sendVideoFile(file) {
        videoResult.style.display = 'block';
        videoOutput.textContent = 'MoviePy 提取 16kHz 音軌與 ASR 意識別中 (影片較大時需數秒時間)...';

        // 顯示影片預覽
        const videoPreviewContainer = document.getElementById('videoPreviewContainer');
        const videoPreview = document.getElementById('videoPreview');
        const fileUrl = URL.createObjectURL(file);
        videoPreview.src = fileUrl;
        videoPreviewContainer.style.display = 'block';
        currentVideoData = null; // 重置資料

        const formData = new FormData();
        formData.append('file', file);
        formData.append('tribe', currentTribe);

        try {
            const res = await fetch('/api/video', { method: 'POST', body: formData });
            const data = await res.json();

            if (data.error) {
                videoOutput.textContent = `❌ ${data.error}`;
            } else {
                currentVideoData = data; // 保存資料供按鈕使用
                
                // 渲染各個片段
                videoOutput.innerHTML = '';
                if (data.segments && data.segments.length > 0) {
                    data.segments.sort((a, b) => a.start - b.start).forEach((seg, idx) => {
                        const card = document.createElement('div');
                        card.style.cssText = 'background: rgba(0,0,0,0.4); padding: 12px; border-radius: 8px; border-left: 3px solid var(--primary-cyan); margin-bottom: 10px;';
                        const timeRange = `[${formatSRTTime(seg.start).split(',')[0]} - ${formatSRTTime(seg.end).split(',')[0]}]`;
                        card.innerHTML = `
                            <div style="font-size: 0.8rem; color: var(--text-dim); margin-bottom: 6px;">
                                <i class="fa-regular fa-clock"></i> 區段 ${idx + 1} &nbsp; ${timeRange}
                            </div>
                            <div style="color: var(--text-muted); font-size: 0.95rem;"><strong>提取音逐字稿：</strong> <span>${seg.source}</span></div>
                            <div style="color: var(--primary-cyan); font-weight: 600; font-size: 1.1rem; margin-top: 4px;"><strong>【${currentTribe}對譯】：</strong> <span>${seg.target}</span></div>
                        `;
                        videoOutput.appendChild(card);
                    });
                } else {
                    videoOutput.innerHTML = `<div style="color: var(--text-dim);">無法辨識出任何有效語音區段。</div>`;
                }
            }
        } catch (err) {
            videoOutput.textContent = `❌ 影片處理失敗: ${err.message}`;
        }
    }

    // 影片模組按鈕綁定
    const downloadAudioBtn = document.getElementById('downloadAudioBtn');
    const downloadSrtBtn = document.getElementById('downloadSrtBtn');
    const copyVideoBtn = document.getElementById('copyVideoBtn');
    const downloadVideoWordBtn = document.getElementById('downloadVideoWordBtn');

    if(downloadAudioBtn) {
        downloadAudioBtn.addEventListener('click', () => {
            if (!currentVideoData || !currentVideoData.audio_url) {
                alert('無可用的音軌檔案。');
                return;
            }
            const link = document.createElement('a');
            link.href = currentVideoData.audio_url;
            link.download = getTimestampedFileName('影片提取音軌.wav');
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        });
    }

    if(downloadSrtBtn) {
        downloadSrtBtn.addEventListener('click', () => {
            if (!currentVideoData || !currentVideoData.segments) {
                alert('請先等待影片辨識完成或確認有辨識出段落。');
                return;
            }
            
            let srtContent = '';
            currentVideoData.segments.sort((a, b) => a.start - b.start).forEach((seg, idx) => {
                const startTime = formatSRTTime(seg.start);
                const endTime = formatSRTTime(seg.end);
                srtContent += `${idx + 1}\n${startTime} --> ${endTime}\n${seg.source}\n${seg.target}\n\n`;
            });
            
            const blob = new Blob([srtContent], { type: 'text/plain' });
            const url = URL.createObjectURL(blob);
            const link = document.createElement('a');
            link.href = url;
            link.download = getTimestampedFileName('影片翻譯字幕.srt');
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
            URL.revokeObjectURL(url);
        });
    }

    if(copyVideoBtn) {
        copyVideoBtn.addEventListener('click', () => {
            if (!currentVideoData || !currentVideoData.segments) return;
            
            const outputText = currentVideoData.segments.sort((a, b) => a.start - b.start).map((seg, idx) => {
                return `[區段 ${idx + 1}]\n【原音逐字稿】: ${seg.source}\n【${currentVideoData.tribe}翻譯】: ${seg.target}`;
            }).join('\n\n');
            
            navigator.clipboard.writeText(outputText);
            const originalText = copyVideoBtn.innerHTML;
            copyVideoBtn.innerHTML = '<i class="fa-solid fa-check"></i> 已複製';
            setTimeout(() => copyVideoBtn.innerHTML = originalText, 2000);
        });
    }

    if(downloadVideoWordBtn) {
        downloadVideoWordBtn.addEventListener('click', () => {
            if (!currentVideoData || !currentVideoData.segments) return;
            
            const outputText = currentVideoData.segments.sort((a, b) => a.start - b.start).map((seg, idx) => {
                return `<p style="font-family: Arial, sans-serif; font-size: 11pt; color: #888;">[區段 ${idx + 1}]</p>
                        <p style="font-family: Arial, sans-serif; font-size: 14pt; color: #555;">【原音逐字稿】: ${seg.source}</p>
                        <p style="font-family: Arial, sans-serif; font-size: 16pt; color: #008080; font-weight: bold; margin-bottom: 20px;">【${currentVideoData.tribe}翻譯】: ${seg.target}</p>`;
            }).join('');
            
            const htmlContent = `
                <html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:w='urn:schemas-microsoft-com:office:word' xmlns='http://www.w3.org/TR/REC-html40'>
                <head><meta charset='utf-8'><title>影片翻譯結果</title></head>
                <body>
                    <h1 style="text-align: center; color: #333;">影片翻譯結果</h1>
                    <hr>
                    ${outputText}
                </body>
                </html>
            `;
            const blob = new Blob(['\ufeff', htmlContent], { type: 'application/msword' });
            const url = URL.createObjectURL(blob);
            const link = document.createElement('a');
            link.href = url;
            link.download = getTimestampedFileName('影片翻譯結果.doc');
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
            URL.revokeObjectURL(url);
        });
    }

    // 13. 💬 送出報錯與建議 (POST /api/feedback)
    const sendFeedbackBtn = document.getElementById('sendFeedbackBtn');
    sendFeedbackBtn.addEventListener('click', async () => {
        const nickname = document.getElementById('fbNickname').value.trim() || '熱心使用者';
        const comment = document.getElementById('fbComment').value.trim();

        if (!comment) {
            alert('請填寫回饋與建議內容！');
            return;
        }

        sendFeedbackBtn.disabled = true;
        sendFeedbackBtn.innerHTML = '<span class="loading-spinner"></span> 發送中...';

        try {
            const res = await fetch('/api/feedback', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ user_nickname: nickname, tribe: currentTribe, comment: comment })
            });
            const data = await res.json();
            alert('✅ 感謝您的寶貴回饋！意見已成功寄送給料維護團隊。');
            document.getElementById('fbComment').value = '';
        } catch (err) {
            alert('❌ 寄送失敗，請稍後再試。');
        } finally {
            sendFeedbackBtn.disabled = false;
            sendFeedbackBtn.innerHTML = '<i class="fa-solid fa-envelope"></i> 送出意見回饋';
        }
    });

    // 14. 歷史紀錄儲存
    function saveToHistory(source, target, tribe) {
        let history = JSON.parse(localStorage.getItem('ilrdf_history') || '[]');
        history.unshift({ source, target, tribe, time: new Date().toLocaleTimeString() });
        history = history.slice(0, 8); // 保留最新 8 條
        localStorage.setItem('ilrdf_history', JSON.stringify(history));
        renderHistory();
    }

    function renderHistory() {
        let history = JSON.parse(localStorage.getItem('ilrdf_history') || '[]');
        if (history.length === 0) {
            historyList.innerHTML = '<div style="color: var(--text-dim); font-size: 0.85rem; padding: 10px;">尚未有翻譯紀錄。</div>';
            return;
        }

        historyList.innerHTML = '';
        history.forEach(h => {
            const item = document.createElement('div');
            item.className = 'history-item';
            item.innerHTML = `
                <div>
                    <div><strong>${h.source}</strong> → <span style="color: var(--primary-cyan);">${h.target}</span></div>
                    <div style="font-size: 0.75rem; color: var(--text-dim);">${h.tribe} | ${h.time}</div>
                </div>
                <button class="btn btn-secondary" style="padding: 4px 8px; font-size: 0.75rem;">帶入</button>
            `;
            item.querySelector('button').addEventListener('click', () => {
                textInput.value = h.source;
                tribeSelect.value = h.tribe;
                currentTribe = h.tribe;
                updateCharCount();
                handleTranslate();
            });
            historyList.appendChild(item);
        });
    }

    // 初始化速查句卡與歷史紀錄
    initPhrasebook();
    renderHistory();

    // 清除歷史紀錄 (綁定為全域函式，讓 HTML onclick 可以呼叫)
    window.clearHistory = function() {
        if (!confirm('確定要清除全部翻譯歷史紀錄嗎？此操作無法復原。')) return;
        localStorage.removeItem('ilrdf_history');
        renderHistory();
        // 給按鈕一個短暫的視覺回饋
        const btn = document.getElementById('clearHistoryBtn');
        if (btn) {
            const orig = btn.innerHTML;
            btn.innerHTML = '<i class="fa-solid fa-check"></i> 已清除';
            btn.style.color = '#4ade80';
            btn.style.borderColor = 'rgba(74,222,128,0.4)';
            setTimeout(() => {
                btn.innerHTML = orig;
                btn.style.color = '#ff6b6b';
                btn.style.borderColor = 'rgba(255,80,80,0.4)';
            }, 1500);
        }
    };

    // 15. 深度文化潤飾 Modal 事件綁定
    const deepTranslateModal = document.getElementById('deepTranslateModal');
    const closeModalBtn = document.getElementById('closeModalBtn');
    const copyDeepResultBtn = document.getElementById('copyDeepResultBtn');
    const downloadWordBtn = document.getElementById('downloadWordBtn');

    closeModalBtn.addEventListener('click', () => {
        deepTranslateModal.style.display = 'none';
    });
    
    // 點擊背景關閉
    deepTranslateModal.addEventListener('click', (e) => {
        if (e.target === deepTranslateModal) {
            deepTranslateModal.style.display = 'none';
        }
    });

    if (apiKeyModal) {
        apiKeyModal.addEventListener('click', (e) => {
            if (e.target === apiKeyModal) {
                closeApiKeyModal(null);
            }
        });
    }

    // 複製結果
    copyDeepResultBtn.addEventListener('click', () => {
        const content = document.getElementById('deepTranslateResultBody').textContent;
        navigator.clipboard.writeText(content).then(() => {
            const originalText = copyDeepResultBtn.innerHTML;
            copyDeepResultBtn.innerHTML = '<i class="fa-solid fa-check"></i> 已複製';
            setTimeout(() => copyDeepResultBtn.innerHTML = originalText, 2000);
        });
    });

    // 下載 WORD
    downloadWordBtn.addEventListener('click', () => {
        const content = document.getElementById('deepTranslateResultBody').textContent;
        // 簡單生成相容 Word 的 HTML 格式 doc
        const htmlContent = `
            <html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:w='urn:schemas-microsoft-com:office:word' xmlns='http://www.w3.org/TR/REC-html40'>
            <head><meta charset='utf-8'><title>深度文化潤飾結果</title></head>
            <body>
                <div style="font-family: 'Microsoft JhengHei', sans-serif; font-size: 14pt; line-height: 1.5; white-space: pre-wrap;">${content}</div>
            </body>
            </html>
        `;
        const blob = new Blob(['\ufeff', htmlContent], { type: 'application/msword' });
        const url = URL.createObjectURL(blob);
        const link = document.createElement('a');
        link.href = url;
        link.download = getTimestampedFileName('深度文化潤飾結果.doc');
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
        URL.revokeObjectURL(url);
    });

    // 16. 長句測試區事件綁定
    const longPhraseZh = document.getElementById('longPhraseZh');
    const longPhraseNative = document.getElementById('longPhraseNative');
    
    if (longPhraseZh) {
        longPhraseZh.addEventListener('click', () => {
            textInput.value = '很久以前，天地間只有黑暗沒有白天，人類的生活很辛苦而且沒有發展。就這樣以松樹的木片點火當作燈來做家事及到田間工作。';
            updateCharCount();
            updateDirBtnsUI('zh_to_native');
        });
    }

    if (longPhraseNative) {
        longPhraseNative.addEventListener('click', () => {
            textInput.value = 'Mqaras ku bi qmita sunan, Lituk ka hangan mu, ima ka hangan su? Emptgsa ku ka yaku, ga ku tmgsa kari Truku. Gaga su qmpah qpahun manu?';
            updateCharCount();
            updateDirBtnsUI('native_to_zh');
        });
    }
});