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<!DOCTYPE html>
<html lang="vi">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Ứng dụng tạo ảnh AI</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script type="module">
  // Import the functions you need from the SDKs you need
  import { initializeApp } from "https://www.gstatic.com/firebasejs/12.2.1/firebase-app.js";
  // TODO: Add SDKs for Firebase products that you want to use
  // https://firebase.google.com/docs/web/setup#available-libraries

  // Your web app's Firebase configuration
  const firebaseConfig = {
    apiKey: "AIzaSyAWpLwAvoP7mKxHJwe8NReP9AAmpDDlIz8",
    authDomain: "tubepsale.firebaseapp.com",
    databaseURL: "https://tubepsale.firebaseio.com",
    projectId: "tubepsale",
    storageBucket: "tubepsale.firebasestorage.app",
    messagingSenderId: "23390990085",
    appId: "1:23390990085:web:083105380021186bd2916c"
  };

  // Initialize Firebase
  const app = initializeApp(firebaseConfig);

        // Khai báo và gán giá trị cho các biến
        // State of the application
        const state = {
            uploadedImages: [],
            promptData: [
                { id: 0, prompt: '', inputImage: null, outputImage: null, loading: false, promptLoading: false },
                { id: 1, prompt: '', inputImage: null, outputImage: null, loading: false, promptLoading: false },
                { id: 2, prompt: '', inputImage: null, outputImage: null, loading: false, promptLoading: false },
                { id: 3, prompt: '', inputImage: null, outputImage: null, loading: false, promptLoading: false },
            ],
            galleryImages: [],
            galleryPrompts: [],
            currentPromptIdForInputSelection: null,
            selectedStyle: 'default'
        };

        let isAuthReady = false;

        async function initApp() {
            try {
                const app = initializeApp(firebaseConfig);
                db = getFirestore(app);
                auth = getAuth(app);
            } catch (error) {
                console.error("Lỗi khi khởi tạo Firebase:", error);
            }

            onAuthStateChanged(auth, async (user) => {
                if (user) {
                    userId = user.uid;
                    isAuthReady = true;
                    console.log("Authenticated with user ID:", userId);
                    loadData();
                    loadGallery();
                    loadPromptGallery();
                } else {
                    try {
                        if (initialAuthToken) {
                            await signInWithCustomToken(auth, initialAuthToken);
                        } else {
                            await signInAnonymously(auth);
                        }
                    } catch (error) {
                        console.error("Lỗi khi xác thực:", error);
                        isAuthReady = true;
                    }
                }
                updateUI();
            });
        }

        async function saveToFirestore() {
            if (!userId || !isAuthReady) return;
            const docRef = doc(db, "artifacts", appId, "users", userId, "imageGenData", "prompts");
            const dataToSave = {
                promptData: state.promptData.map(p => ({
                    id: p.id,
                    prompt: p.prompt,
                    inputImage: p.inputImage,
                    outputImage: p.outputImage
                }))
            };
            try {
                await setDoc(docRef, dataToSave, { merge: true });
            } catch (error) {
                console.error("Lỗi khi lưu dữ liệu vào Firestore:", error);
            }
        }

        async function loadData() {
            if (!userId) return;
            const docRef = doc(db, "artifacts", appId, "users", userId, "imageGenData", "prompts");
            onSnapshot(docRef, (docSnap) => {
                if (docSnap.exists()) {
                    const data = docSnap.data();
                    if (data.promptData) {
                        data.promptData.forEach(p => {
                            const index = state.promptData.findIndex(item => item.id === p.id);
                            if (index !== -1) {
                                state.promptData[index].prompt = p.prompt;
                                state.promptData[index].inputImage = p.inputImage;
                                state.promptData[index].outputImage = p.outputImage;
                            }
                        });
                    }
                }
                updateUI();
            }, (error) => {
                console.error("Lỗi khi tải dữ liệu từ Firestore:", error);
            });
        }

        async function loadGallery() {
            if (!userId) return;
            const galleryRef = collection(db, "artifacts", appId, "users", userId, "imageGallery");
            onSnapshot(galleryRef, (querySnapshot) => {
                state.galleryImages = [];
                querySnapshot.forEach((doc) => {
                    const data = doc.data();
                    state.galleryImages.push({ id: doc.id, image: data.image });
                });
                updateUI();
            }, (error) => {
                console.error("Lỗi khi tải thư viện ảnh:", error);
            });
        }

        async function loadPromptGallery() {
            if (!userId) return;
            const promptGalleryRef = collection(db, "artifacts", appId, "users", userId, "promptGallery");
            onSnapshot(promptGalleryRef, (querySnapshot) => {
                state.galleryPrompts = [];
                querySnapshot.forEach((doc) => {
                    const data = doc.data();
                    state.galleryPrompts.push({ id: doc.id, prompt: data.prompt });
                });
                updateUI();
            }, (error) => {
                console.error("Lỗi khi tải thư viện prompt:", error);
            });
        }

        async function saveImageToGallery(id) {
            if (!userId) {
                showMessage("Vui lòng đăng nhập để lưu ảnh.", 'error');
                return;
            }
            const image = state.promptData[id].outputImage;
            if (!image) {
                showMessage("Không có ảnh để lưu.", 'warning');
                return;
            }
            const galleryRef = collection(db, "artifacts", appId, "users", userId, "imageGallery");
            try {
                await addDoc(galleryRef, {
                    image: image,
                    timestamp: new Date()
                });
                showMessage("Ảnh đã được lưu vào thư viện!", 'success');
            } catch (error) {
                console.error("Lỗi khi lưu ảnh vào thư viện:", error);
                showMessage("Lỗi khi lưu ảnh vào thư viện.", 'error');
            }
        }

        async function savePromptToGallery(id) {
            if (!userId) {
                showMessage("Vui lòng đăng nhập để lưu prompt.", 'error');
                return;
            }
            const prompt = state.promptData[id].prompt;
            if (!prompt.trim()) {
                showMessage("Không có prompt để lưu.", 'warning');
                return;
            }
            const promptGalleryRef = collection(db, "artifacts", appId, "users", userId, "promptGallery");
            try {
                await addDoc(promptGalleryRef, {
                    prompt: prompt,
                    timestamp: new Date()
                });
                showMessage("Prompt đã được lưu vào thư viện!", 'success');
            } catch (error) {
                console.error("Lỗi khi lưu prompt vào thư viện:", error);
                showMessage("Lỗi khi lưu prompt vào thư viện.", 'error');
            }
        }

        function updateUI() {
            // Default behavior: use previous output as next input if none is set
            for (let i = 1; i < state.promptData.length; i++) {
                if (state.promptData[i].inputImage === null && state.promptData[i-1].outputImage !== null) {
                    state.promptData[i].inputImage = state.promptData[i-1].outputImage;
                }
            }

            // Update UI for prompts and generated images
            state.promptData.forEach(p => {
                const promptInput = document.getElementById(`prompt-${p.id}`);
                const inputImageContainer = document.getElementById(`input-image-container-${p.id}`);
                const outputImageContainer = document.getElementById(`output-image-container-${p.id}`);
                const generateButton = document.getElementById(`generate-btn-${p.id}`);
                const autoPromptButton = document.getElementById(`auto-prompt-btn-${p.id}`);

                if (promptInput) {
                    promptInput.value = p.prompt;
                }

                if (inputImageContainer) {
                    if (p.inputImage) {
                        inputImageContainer.innerHTML = `<img src="${p.inputImage}" class="w-full h-full object-contain rounded-md cursor-pointer">`;
                        inputImageContainer.querySelector('img').addEventListener('click', () => showModal(p.inputImage));
                    } else {
                        inputImageContainer.innerHTML = `<p class="text-sm text-gray-400">Chọn ảnh đầu vào.</p>`;
                    }
                }

                if (outputImageContainer) {
                    if (p.outputImage) {
                        outputImageContainer.innerHTML = `<img src="${p.outputImage}" class="w-full h-full object-contain rounded-md cursor-pointer">`;
                        outputImageContainer.querySelector('img').addEventListener('click', () => showModal(p.outputImage));
                    } else {
                        outputImageContainer.innerHTML = `<div class="w-full h-full bg-gray-200 rounded-lg flex items-center justify-center">
                            <svg class="h-12 w-12 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l-4 4m6-6l-4 4m6-6a2 2 0 100 4 2 2 0 000-4z"></path></svg>
                        </div>`;
                    }
                }

                if (generateButton) {
                    if (p.loading) {
                        generateButton.innerHTML = `<svg class="animate-spin h-5 w-5 mr-3 text-white" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path></svg>Đang tạo ảnh...`;
                        generateButton.disabled = true;
                    } else {
                        generateButton.innerHTML = 'Tạo ảnh';
                        generateButton.disabled = !p.inputImage || !p.prompt.trim();
                    }
                }

                if (autoPromptButton) {
                    if (p.promptLoading) {
                        autoPromptButton.innerHTML = `<svg class="animate-spin h-5 w-5 mr-3 text-gray-800" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path></svg>Đang tạo...`;
                        autoPromptButton.disabled = true;
                    } else {
                        autoPromptButton.innerHTML = 'Tạo Prompt tự động';
                        autoPromptButton.disabled = !p.inputImage;
                    }
                }
            });

            // Update UI for uploaded images preview
            const uploadedPreviewContainer = document.getElementById('uploaded-images-preview');
            if (uploadedPreviewContainer) {
                uploadedPreviewContainer.innerHTML = '';
                state.uploadedImages.forEach(imgUrl => {
                    const img = document.createElement('img');
                    img.src = imgUrl;
                    img.className = 'w-24 h-24 object-cover rounded-md shadow-md cursor-pointer transition-transform duration-200 hover:scale-110';
                    img.title = "Click để chọn làm ảnh đầu vào";
                    img.addEventListener('click', () => {
                        const promptId = state.currentPromptIdForInputSelection;
                        if (promptId !== null) {
                            state.promptData[promptId].inputImage = imgUrl;
                            updateUI();
                            saveToFirestore();
                            showMessage("Đã chọn ảnh đầu vào thành công!", 'success');
                        }
                    });
                    uploadedPreviewContainer.appendChild(img);
                });
                if (state.uploadedImages.length === 0) {
                     uploadedPreviewContainer.innerHTML = '<p class="text-sm text-gray-400">Các ảnh bạn tải lên sẽ hiển thị ở đây.</p>';
                }
            }

            // Update UI for image gallery
            const galleryContainer = document.getElementById('gallery-container');
            if (galleryContainer) {
                galleryContainer.innerHTML = '';
                state.galleryImages.forEach(imgData => {
                    const img = document.createElement('img');
                    img.src = imgData.image;
                    img.className = 'w-24 h-24 object-cover rounded-md shadow-md cursor-pointer transition-transform duration-200 hover:scale-110';
                    img.title = "Click để xem toàn màn hình";
                    img.addEventListener('click', () => showModal(imgData.image));
                    galleryContainer.appendChild(img);
                });
                if (state.galleryImages.length === 0) {
                     galleryContainer.innerHTML = '<p class="text-sm text-gray-400">Ảnh đã lưu sẽ hiển thị ở đây.</p>';
                }
            }

            // Update UI for prompt gallery
            const promptGalleryContainer = document.getElementById('prompt-gallery-container');
            if (promptGalleryContainer) {
                promptGalleryContainer.innerHTML = '';
                state.galleryPrompts.forEach(promptData => {
                    const promptDiv = document.createElement('div');
                    promptDiv.className = 'bg-gray-100 p-3 rounded-lg text-sm break-words flex justify-between items-center';
                    promptDiv.innerHTML = `<p>${promptData.prompt}</p>
                                          <button data-action="copy-gallery-prompt" data-prompt="${promptData.prompt}" class="ml-4 p-2 bg-violet-200 text-violet-800 rounded-full hover:bg-violet-300 transition-colors">Sao chép</button>`;
                    promptGalleryContainer.appendChild(promptDiv);
                });
                if (state.galleryPrompts.length === 0) {
                     promptGalleryContainer.innerHTML = '<p class="text-sm text-gray-400">Các prompt đã lưu sẽ hiển thị ở đây.</p>';
                }
            }

            const userIdDisplay = document.getElementById('user-id-display');
            if (userIdDisplay) {
                userIdDisplay.textContent = `ID người dùng: ${userId || 'Đang tải...'}`;
                if (userId && !isAuthReady) {
                     userIdDisplay.textContent = "Đang xác thực...";
                }
            }
        }

        async function generateImage(id) {
            const prompt = state.promptData[id].prompt;
            const inputImage = state.promptData[id].inputImage;
            const style = state.selectedStyle === 'default' ? '' : state.selectedStyle;

            if (!inputImage) {
                showMessage("Vui lòng chọn ảnh đầu vào trước khi tạo.", 'warning');
                return;
            }
            if (!prompt.trim()) {
                showMessage("Vui lòng nhập lời nhắc (prompt) cho hình ảnh.", 'warning');
                return;
            }

            state.promptData[id].loading = true;
            updateUI();

            const fullPrompt = `${prompt}, ${style}`;
            const payload = {
                contents: [{
                    parts: [
                        { text: fullPrompt },
                        {
                            inlineData: {
                                mimeType: "image/png",
                                data: inputImage.split(',')[1] // Extract Base64 data
                            }
                        }
                    ]
                }],
                generationConfig: {
                    responseModalities: ['TEXT', 'IMAGE']
                }
            };

            const apiUrl = `https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-image-preview:generateContent?key=`;

            let retries = 0;
            const maxRetries = 5;
            const delay = 1000;

            const fetchWithRetry = async (url, options) => {
                try {
                    const response = await fetch(url, options);
                    if (!response.ok) throw new Error('API request failed');
                    return response;
                } catch (error) {
                    if (retries < maxRetries) {
                        retries++;
                        await new Promise(res => setTimeout(res, delay * Math.pow(2, retries)));
                        return fetchWithRetry(url, options);
                    } else {
                        throw error;
                    }
                }
            };

            try {
                const response = await fetchWithRetry(apiUrl, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify(payload)
                });
                const result = await response.json();
                const base64Data = result?.candidates?.[0]?.content?.parts?.find(p => p.inlineData)?.inlineData?.data;

                if (base64Data) {
                    state.promptData[id].outputImage = `data:image/png;base64,${base64Data}`;
                    showMessage("Tạo ảnh thành công!", 'success');
                } else {
                    throw new Error("Không nhận được dữ liệu hình ảnh.");
                }
            } catch (error) {
                console.error("Lỗi khi tạo ảnh:", error);
                showMessage("Lỗi khi tạo ảnh. Vui lòng thử lại.", 'error');
            } finally {
                state.promptData[id].loading = false;
                updateUI();
                await saveToFirestore();
            }
        }

        async function generateAutoPrompt(id) {
            const inputImage = state.promptData[id].inputImage;
            if (!inputImage) {
                showMessage("Vui lòng chọn ảnh đầu vào trước.", 'warning');
                return;
            }

            state.promptData[id].promptLoading = true;
            updateUI();

            const payload = {
                contents: [
                    {
                        parts: [
                            { text: "Mô tả đối tượng, phong cách và bối cảnh của hình ảnh này bằng một lời nhắc ngắn gọn, sáng tạo và chi tiết bằng tiếng Việt, phù hợp cho mô hình tạo ảnh." },
                            {
                                inlineData: {
                                    mimeType: "image/png",
                                    data: inputImage.split(',')[1]
                                }
                            }
                        ]
                    }
                ]
            };
            
            const apiUrl = `https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-preview-05-20:generateContent?key=`;

            let retries = 0;
            const maxRetries = 5;
            const delay = 1000;

            const fetchWithRetry = async (url, options) => {
                try {
                    const response = await fetch(url, options);
                    if (!response.ok) throw new Error('API request failed');
                    return response;
                } catch (error) {
                    if (retries < maxRetries) {
                        retries++;
                        await new Promise(res => setTimeout(res, delay * Math.pow(2, retries)));
                        return fetchWithRetry(url, options);
                    } else {
                        throw error;
                    }
                }
            };

            try {
                const response = await fetchWithRetry(apiUrl, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify(payload)
                });
                const result = await response.json();
                const generatedPrompt = result?.candidates?.[0]?.content?.parts?.[0]?.text;

                if (generatedPrompt) {
                    state.promptData[id].prompt = generatedPrompt;
                    showMessage("Đã tạo prompt tự động!", 'success');
                } else {
                    throw new Error("Không nhận được prompt.");
                }
            } catch (error) {
                console.error("Lỗi khi tạo prompt tự động:", error);
                showMessage("Lỗi khi tạo prompt tự động. Vui lòng thử lại.", 'error');
            } finally {
                state.promptData[id].promptLoading = false;
                updateUI();
                await saveToFirestore();
            }
        }

        function copyToClipboard(text) {
            if (!text.trim()) {
                showMessage("Không có nội dung để sao chép.", 'warning');
                return;
            }
            navigator.clipboard.writeText(text).then(() => {
                showMessage("Đã sao chép!", 'success');
            }).catch(err => {
                console.error('Lỗi khi sao chép:', err);
                showMessage("Lỗi khi sao chép.", 'error');
            });
        }

        function handleFileSelect(event) {
            const files = event.target.files;
            if (files.length === 0) return;

            state.uploadedImages = [];
            let filesProcessed = 0;

            for (let i = 0; i < files.length; i++) {
                const file = files[i];
                if (file.type.startsWith('image/')) {
                    const reader = new FileReader();
                    reader.onload = (e) => {
                        state.uploadedImages.push(e.target.result);
                        filesProcessed++;
                        if (filesProcessed === files.length) {
                            updateUI();
                            showMessage("Đã tải ảnh lên thành công!", "success");
                        }
                    };
                    reader.readAsDataURL(file);
                }
            }
        }

        let messageTimeout;
        function showMessage(message, type = 'info') {
            const messageBox = document.getElementById('message-box');
            if (!messageBox) return;

            messageBox.textContent = message;
            messageBox.className = 'fixed top-4 right-4 z-50 p-4 rounded-lg shadow-lg transition-all duration-300 transform translate-y-0 opacity-100 cursor-pointer';

            switch(type) {
                case 'error':
                    messageBox.classList.add('bg-red-500', 'text-white');
                    break;
                case 'warning':
                    messageBox.classList.add('bg-yellow-500', 'text-white');
                    break;
                case 'success':
                    messageBox.classList.add('bg-green-500', 'text-white');
                    break;
                default:
                    messageBox.classList.add('bg-blue-500', 'text-white');
            }

            clearTimeout(messageTimeout);
            if (type !== 'error' && type !== 'warning') {
                messageTimeout = setTimeout(() => {
                    hideMessage();
                }, 3000);
            }
        }

        function hideMessage() {
            const messageBox = document.getElementById('message-box');
            if (messageBox) {
                messageBox.className = 'fixed top-4 right-4 z-50 p-4 rounded-lg shadow-lg transition-all duration-300 transform -translate-y-full opacity-0';
            }
        }

        function showModal(imageUrl) {
            const modal = document.getElementById('modal');
            const modalImage = document.getElementById('modal-image');
            if (modal && modalImage) {
                modalImage.src = imageUrl;
                modal.classList.remove('hidden');
                modal.classList.add('flex');
            }
        }

        function hideModal() {
            const modal = document.getElementById('modal');
            if (modal) {
                modal.classList.add('hidden');
                modal.classList.remove('flex');
            }
        }

        function showInputSelectionModal(promptId) {
            state.currentPromptIdForInputSelection = promptId;
            const inputModal = document.getElementById('input-selection-modal');
            const uploadedContainer = document.getElementById('uploaded-modal-container');
            const galleryContainer = document.getElementById('gallery-modal-container');
            
            uploadedContainer.innerHTML = '';
            state.uploadedImages.forEach(imgUrl => {
                const img = document.createElement('img');
                img.src = imgUrl;
                img.className = 'w-24 h-24 object-cover rounded-md cursor-pointer transition-transform duration-200 hover:scale-110';
                img.addEventListener('click', () => useSelectedAsInput(imgUrl));
                uploadedContainer.appendChild(img);
            });
            if (state.uploadedImages.length === 0) {
                 uploadedContainer.innerHTML = '<p class="text-sm text-gray-400">Không có ảnh mẫu đã tải lên.</p>';
            }

            galleryContainer.innerHTML = '';
            state.galleryImages.forEach(imgData => {
                const img = document.createElement('img');
                img.src = imgData.image;
                img.className = 'w-24 h-24 object-cover rounded-md cursor-pointer transition-transform duration-200 hover:scale-110';
                img.addEventListener('click', () => useSelectedAsInput(imgData.image));
                galleryContainer.appendChild(img);
            });
             if (state.galleryImages.length === 0) {
                 galleryContainer.innerHTML = '<p class="text-sm text-gray-400">Không có ảnh đã lưu trong thư viện.</p>';
            }

            inputModal.classList.remove('hidden');
            inputModal.classList.add('flex');
        }

        function hideInputSelectionModal() {
            const inputModal = document.getElementById('input-selection-modal');
            inputModal.classList.add('hidden');
            inputModal.classList.remove('flex');
            state.currentPromptIdForInputSelection = null;
        }

        function useSelectedAsInput(imageUrl) {
            const promptId = state.currentPromptIdForInputSelection;
            if (promptId !== null) {
                state.promptData[promptId].inputImage = imageUrl;
                hideInputSelectionModal();
                updateUI();
                saveToFirestore();
            }
        }

        window.onload = () => {
            initApp();

            document.getElementById('file-upload').addEventListener('change', handleFileSelect);
            document.getElementById('style-select').addEventListener('change', (event) => {
                state.selectedStyle = event.target.value;
                showMessage(`Đã thay đổi phong cách thành: ${event.target.options[event.target.selectedIndex].text}`, 'info');
            });

            document.getElementById('prompt-grid').addEventListener('click', (event) => {
                const target = event.target.closest('button');
                if (!target) return;
                const action = target.dataset.action;
                const id = parseInt(target.dataset.id);

                if (action === 'generate') {
                    generateImage(id);
                } else if (action === 'delete') {
                    state.promptData[id].outputImage = null;
                    saveToFirestore();
                    updateUI();
                } else if (action === 'save-gallery') {
                    saveImageToGallery(id);
                } else if (action === 'select-input') {
                    showInputSelectionModal(id);
                } else if (action === 'auto-prompt') {
                    generateAutoPrompt(id);
                } else if (action === 'save-prompt') {
                    savePromptToGallery(id);
                } else if (action === 'copy-prompt') {
                    copyToClipboard(state.promptData[id].prompt);
                }
            });

            document.getElementById('prompt-grid').addEventListener('input', (event) => {
                const target = event.target;
                if (target.tagName === 'TEXTAREA' && target.id.startsWith('prompt-')) {
                    const id = parseInt(target.dataset.id);
                    state.promptData[id].prompt = target.value;
                }
            });

            document.getElementById('prompt-gallery-container').addEventListener('click', (event) => {
                const target = event.target.closest('button');
                if (!target) return;
                const action = target.dataset.action;
                if (action === 'copy-gallery-prompt') {
                    const promptText = target.dataset.prompt;
                    copyToClipboard(promptText);
                }
            });

            document.getElementById('modal-close').addEventListener('click', hideModal);
            document.getElementById('modal').addEventListener('click', (e) => {
                if (e.target.id === 'modal') {
                    hideModal();
                }
            });

            document.getElementById('input-selection-modal-close').addEventListener('click', hideInputSelectionModal);
            document.getElementById('input-selection-modal').addEventListener('click', (e) => {
                if (e.target.id === 'input-selection-modal') {
                    hideInputSelectionModal();
                }
            });

            document.getElementById('message-box').addEventListener('click', hideMessage);
        };
    </script>
    <style>
        body {
            font-family: 'Inter', sans-serif;
            background-color: #f3f4f6;
        }
        .container {
            max-width: 1200px;
        }
    </style>
</head>
<body class="bg-gray-100 text-gray-800 p-4 min-h-screen flex items-center justify-center">
    <!-- Full-screen Modal for viewing images -->
    <div id="modal" class="fixed inset-0 bg-black bg-opacity-80 hidden z-50 justify-center items-center p-4">
        <div class="relative max-w-5xl max-h-full">
            <button id="modal-close" class="absolute top-4 right-4 text-white text-3xl font-bold p-2 leading-none rounded-full bg-gray-800 bg-opacity-50 hover:bg-opacity-80 transition-colors">×</button>
            <img id="modal-image" class="max-w-full max-h-[90vh] object-contain rounded-lg shadow-lg">
        </div>
    </div>

    <!-- Input Selection Modal -->
    <div id="input-selection-modal" class="fixed inset-0 bg-black bg-opacity-80 hidden z-50 justify-center items-center p-4">
        <div class="bg-white rounded-xl shadow-2xl p-6 w-full max-w-4xl max-h-[90vh] overflow-y-auto relative">
            <button id="input-selection-modal-close" class="absolute top-4 right-4 text-gray-500 hover:text-gray-800 transition-colors">×</button>
            <h3 class="text-2xl font-bold mb-4">Chọn ảnh đầu vào</h3>
            <div class="space-y-4">
                <div>
                    <h4 class="font-semibold text-gray-700 mb-2">Ảnh mẫu đã tải lên</h4>
                    <div id="uploaded-modal-container" class="flex flex-wrap gap-4 mt-2 border border-dashed border-gray-200 p-2 rounded-lg"></div>
                </div>
                <div>
                    <h4 class="font-semibold text-gray-700 mb-2">Thư viện ảnh đã lưu</h4>
                    <div id="gallery-modal-container" class="flex flex-wrap gap-4 min-h-[50px] border border-dashed border-gray-200 p-2 rounded-lg"></div>
                </div>
            </div>
        </div>
    </div>

    <div class="container mx-auto p-8 bg-white rounded-xl shadow-2xl space-y-8">
        <div id="message-box" class="fixed top-4 right-4 z-50 p-4 rounded-lg shadow-lg transition-all duration-300 transform -translate-y-full opacity-0"></div>

        <div class="text-center space-y-2">
            <h1 class="text-4xl md:text-5xl font-extrabold text-gray-900">
                Studio AI
            </h1>
            <p class="text-lg text-gray-600">
                Tạo hình ảnh với nhân vật nhất quán theo cốt truyện.
            </p>
            <p id="user-id-display" class="text-sm font-mono text-gray-400 mt-2"></p>
        </div>
        
        <div class="border-b-2 border-dashed border-gray-300 pb-6 space-y-4">
            <h2 class="text-2xl font-bold text-gray-800">1. Tùy chỉnh chung</h2>
            <div class="flex flex-col md:flex-row items-start md:items-center space-y-4 md:space-y-0 md:space-x-4">
                <div class="flex items-center space-x-4">
                    <label for="style-select" class="font-semibold text-gray-700">Phong cách:</label>
                    <select id="style-select" class="p-2 rounded-lg border border-gray-300 focus:outline-none focus:ring-2 focus:ring-violet-500">
                        <option value="default">Giữ nguyên phong cách ảnh gốc</option>
                        <option value="Anime style">Phong cách Anime</option>
                        <option value="Cartoon style">Phong cách Hoạt hình</option>
                        <option value="Oil painting">Tranh sơn dầu</option>
                        <option value="Watercolor painting">Tranh màu nước</option>
                        <option value="Pixel art">Nghệ thuật Pixel</option>
                        <option value="Cyberpunk style">Phong cách Cyberpunk</option>
                        <option value="Fantasy art">Nghệ thuật viễn tưởng</option>
                        <option value="Realistic photo">Ảnh chân thực</option>
                    </select>
                </div>
                <div class="flex-grow">
                     <label class="block font-semibold text-gray-700 mb-2">Tải ảnh mẫu:</label>
                    <label class="block">
                        <span class="sr-only">Tải lên file</span>
                        <input type="file" id="file-upload" multiple accept="image/*" class="block w-full text-sm text-gray-500
                            file:mr-4 file:py-2 file:px-4
                            file:rounded-full file:border-0
                            file:text-sm file:font-semibold
                            file:bg-violet-50 file:text-violet-700
                            hover:file:bg-violet-100 cursor-pointer"/>
                    </label>
                </div>
            </div>
            <div id="uploaded-images-preview" class="flex flex-wrap gap-4 mt-4 border border-dashed border-gray-200 p-4 rounded-lg">
                <p class="text-sm text-gray-400">Các ảnh bạn tải lên sẽ hiển thị ở đây.</p>
            </div>
        </div>

        <div class="space-y-4">
            <h2 class="text-2xl font-bold text-gray-800">2. Nhập lời nhắc & Tạo ảnh</h2>
            <div id="prompt-grid" class="grid grid-cols-1 md:grid-cols-2 gap-8">
                <!-- Card 1 -->
                <div class="bg-white rounded-xl shadow-lg p-6 space-y-4 border border-gray-200">
                    <label class="block text-gray-700 font-semibold">Prompt 1:</label>
                    <textarea id="prompt-0" data-id="0" rows="3" class="w-full p-3 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-violet-500 transition-shadow"></textarea>
                    
                    <h3 class="font-semibold text-gray-700">Ảnh đầu vào</h3>
                    <div id="input-image-container-0" class="w-full h-40 bg-gray-200 rounded-lg flex items-center justify-center cursor-pointer border border-dashed">
                        <p class="text-sm text-gray-400">Chọn ảnh đầu vào.</p>
                    </div>
                    <button data-id="0" data-action="select-input" class="w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors">Chọn ảnh từ thư viện</button>
                    <button id="auto-prompt-btn-0" data-id="0" data-action="auto-prompt" class="auto-prompt-btn w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors flex items-center justify-center">Tạo Prompt tự động</button>

                    <h3 class="font-semibold text-gray-700 mt-4">Ảnh đầu ra</h3>
                    <div id="output-image-container-0" class="w-full h-80 bg-gray-200 rounded-lg overflow-hidden flex items-center justify-center">
                        <svg class="h-12 w-12 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l-4 4m6-6l-4 4m6-6a2 2 0 100 4 2 2 0 000-4z"></path></svg>
                    </div>
                    
                    <div class="flex flex-wrap gap-2 justify-end mt-4">
                        <button id="generate-btn-0" data-id="0" data-action="generate" class="generate-btn px-6 py-2 bg-violet-600 text-white font-semibold rounded-full shadow-md hover:bg-violet-700 transition-colors flex items-center justify-center">Tạo ảnh</button>
                        <button data-id="0" data-action="delete" class="px-6 py-2 bg-red-500 text-white font-semibold rounded-full shadow-md hover:bg-red-600 transition-colors">Xóa</button>
                        <button data-id="0" data-action="save-gallery" class="px-6 py-2 bg-blue-500 text-white font-semibold rounded-full shadow-md hover:bg-blue-600 transition-colors">Lưu ảnh</button>
                        <button data-id="0" data-action="save-prompt" class="px-6 py-2 bg-green-500 text-white font-semibold rounded-full shadow-md hover:bg-green-600 transition-colors">Lưu Prompt</button>
                        <button data-id="0" data-action="copy-prompt" class="px-6 py-2 bg-yellow-500 text-white font-semibold rounded-full shadow-md hover:bg-yellow-600 transition-colors">Sao chép</button>
                    </div>
                </div>

                <!-- Card 2 -->
                <div class="bg-white rounded-xl shadow-lg p-6 space-y-4 border border-gray-200">
                    <label class="block text-gray-700 font-semibold">Prompt 2:</label>
                    <textarea id="prompt-1" data-id="1" rows="3" class="w-full p-3 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-violet-500 transition-shadow"></textarea>

                    <h3 class="font-semibold text-gray-700">Ảnh đầu vào</h3>
                    <div id="input-image-container-1" class="w-full h-40 bg-gray-200 rounded-lg flex items-center justify-center cursor-pointer border border-dashed">
                        <p class="text-sm text-gray-400">Chọn ảnh đầu vào.</p>
                    </div>
                    <button data-id="1" data-action="select-input" class="w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors">Chọn ảnh từ thư viện</button>
                    <button id="auto-prompt-btn-1" data-id="1" data-action="auto-prompt" class="auto-prompt-btn w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors flex items-center justify-center">Tạo Prompt tự động</button>

                    <h3 class="font-semibold text-gray-700 mt-4">Ảnh đầu ra</h3>
                    <div id="output-image-container-1" class="w-full h-80 bg-gray-200 rounded-lg overflow-hidden flex items-center justify-center">
                         <svg class="h-12 w-12 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l-4 4m6-6l-4 4m6-6a2 2 0 100 4 2 2 0 000-4z"></path></svg>
                    </div>

                    <div class="flex flex-wrap gap-2 justify-end mt-4">
                        <button id="generate-btn-1" data-id="1" data-action="generate" class="generate-btn px-6 py-2 bg-violet-600 text-white font-semibold rounded-full shadow-md hover:bg-violet-700 transition-colors flex items-center justify-center">Tạo ảnh</button>
                        <button data-id="1" data-action="delete" class="px-6 py-2 bg-red-500 text-white font-semibold rounded-full shadow-md hover:bg-red-600 transition-colors">Xóa</button>
                        <button data-id="1" data-action="save-gallery" class="px-6 py-2 bg-blue-500 text-white font-semibold rounded-full shadow-md hover:bg-blue-600 transition-colors">Lưu ảnh</button>
                        <button data-id="1" data-action="save-prompt" class="px-6 py-2 bg-green-500 text-white font-semibold rounded-full shadow-md hover:bg-green-600 transition-colors">Lưu Prompt</button>
                        <button data-id="1" data-action="copy-prompt" class="px-6 py-2 bg-yellow-500 text-white font-semibold rounded-full shadow-md hover:bg-yellow-600 transition-colors">Sao chép</button>
                    </div>
                </div>

                <!-- Card 3 -->
                <div class="bg-white rounded-xl shadow-lg p-6 space-y-4 border border-gray-200">
                    <label class="block text-gray-700 font-semibold">Prompt 3:</label>
                    <textarea id="prompt-2" data-id="2" rows="3" class="w-full p-3 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-violet-500 transition-shadow"></textarea>

                    <h3 class="font-semibold text-gray-700">Ảnh đầu vào</h3>
                    <div id="input-image-container-2" class="w-full h-40 bg-gray-200 rounded-lg flex items-center justify-center cursor-pointer border border-dashed">
                        <p class="text-sm text-gray-400">Chọn ảnh đầu vào.</p>
                    </div>
                    <button data-id="2" data-action="select-input" class="w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors">Chọn ảnh từ thư viện</button>
                    <button id="auto-prompt-btn-2" data-id="2" data-action="auto-prompt" class="auto-prompt-btn w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors flex items-center justify-center">Tạo Prompt tự động</button>

                    <h3 class="font-semibold text-gray-700 mt-4">Ảnh đầu ra</h3>
                    <div id="output-image-container-2" class="w-full h-80 bg-gray-200 rounded-lg overflow-hidden flex items-center justify-center">
                         <svg class="h-12 w-12 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l-4 4m6-6l-4 4m6-6a2 2 0 100 4 2 2 0 000-4z"></path></svg>
                    </div>

                    <div class="flex flex-wrap gap-2 justify-end mt-4">
                        <button id="generate-btn-2" data-id="2" data-action="generate" class="generate-btn px-6 py-2 bg-violet-600 text-white font-semibold rounded-full shadow-md hover:bg-violet-700 transition-colors flex items-center justify-center">Tạo ảnh</button>
                        <button data-id="2" data-action="delete" class="px-6 py-2 bg-red-500 text-white font-semibold rounded-full shadow-md hover:bg-red-600 transition-colors">Xóa</button>
                        <button data-id="2" data-action="save-gallery" class="px-6 py-2 bg-blue-500 text-white font-semibold rounded-full shadow-md hover:bg-blue-600 transition-colors">Lưu ảnh</button>
                        <button data-id="2" data-action="save-prompt" class="px-6 py-2 bg-green-500 text-white font-semibold rounded-full shadow-md hover:bg-green-600 transition-colors">Lưu Prompt</button>
                        <button data-id="2" data-action="copy-prompt" class="px-6 py-2 bg-yellow-500 text-white font-semibold rounded-full shadow-md hover:bg-yellow-600 transition-colors">Sao chép</button>
                    </div>
                </div>

                <!-- Card 4 -->
                <div class="bg-white rounded-xl shadow-lg p-6 space-y-4 border border-gray-200">
                    <label class="block text-gray-700 font-semibold">Prompt 4:</label>
                    <textarea id="prompt-3" data-id="3" rows="3" class="w-full p-3 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-violet-500 transition-shadow"></textarea>

                    <h3 class="font-semibold text-gray-700">Ảnh đầu vào</h3>
                    <div id="input-image-container-3" class="w-full h-40 bg-gray-200 rounded-lg flex items-center justify-center cursor-pointer border border-dashed">
                        <p class="text-sm text-gray-400">Chọn ảnh đầu vào.</p>
                    </div>
                    <button data-id="3" data-action="select-input" class="w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors">Chọn ảnh từ thư viện</button>
                    <button id="auto-prompt-btn-3" data-id="3" data-action="auto-prompt" class="auto-prompt-btn w-full px-4 py-2 bg-gray-200 text-gray-800 font-semibold rounded-full hover:bg-gray-300 transition-colors flex items-center justify-center">Tạo Prompt tự động</button>

                    <h3 class="font-semibold text-gray-700 mt-4">Ảnh đầu ra</h3>
                    <div id="output-image-container-3" class="w-full h-80 bg-gray-200 rounded-lg overflow-hidden flex items-center justify-center">
                         <svg class="h-12 w-12 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l-4 4m6-6l-4 4m6-6a2 2 0 100 4 2 2 0 000-4z"></path></svg>
                    </div>

                    <div class="flex flex-wrap gap-2 justify-end mt-4">
                        <button id="generate-btn-3" data-id="3" data-action="generate" class="generate-btn px-6 py-2 bg-violet-600 text-white font-semibold rounded-full shadow-md hover:bg-violet-700 transition-colors flex items-center justify-center">Tạo ảnh</button>
                        <button data-id="3" data-action="delete" class="px-6 py-2 bg-red-500 text-white font-semibold rounded-full shadow-md hover:bg-red-600 transition-colors">Xóa</button>
                        <button data-id="3" data-action="save-gallery" class="px-6 py-2 bg-blue-500 text-white font-semibold rounded-full shadow-md hover:bg-blue-600 transition-colors">Lưu ảnh</button>
                        <button data-id="3" data-action="save-prompt" class="px-6 py-2 bg-green-500 text-white font-semibold rounded-full shadow-md hover:bg-green-600 transition-colors">Lưu Prompt</button>
                        <button data-id="3" data-action="copy-prompt" class="px-6 py-2 bg-yellow-500 text-white font-semibold rounded-full shadow-md hover:bg-yellow-600 transition-colors">Sao chép</button>
                    </div>
                </div>
            </div>
        </div>

        <div class="border-t-2 border-dashed border-gray-300 pt-6 space-y-4">
            <h2 class="text-2xl font-bold text-gray-800">3. Thư viện</h2>
            
            <div class="space-y-4">
                <h3 class="font-semibold text-gray-700">Thư viện ảnh đã lưu</h3>
                <div id="gallery-container" class="flex flex-wrap gap-4 rounded-lg border border-dashed border-gray-200 p-4 min-h-[120px]">
                    <p class="text-sm text-gray-400">Ảnh đã lưu sẽ hiển thị ở đây.</p>
                </div>
            </div>

            <div class="space-y-4">
                <h3 class="font-semibold text-gray-700">Thư viện Prompt đã lưu</h3>
                <div id="prompt-gallery-container" class="flex flex-col gap-4 rounded-lg border border-dashed border-gray-200 p-4 min-h-[120px]">
                    <p class="text-sm text-gray-400">Các prompt đã lưu sẽ hiển thị ở đây.</p>
                </div>
            </div>
        </div>
    </div>
</body>
</html>