update ver

.gitignore

@@ -4,3 +4,4 @@
 .DS_Store
 .DS_Store
 /.venv
+/static/uploads

app.py

@@ -2,10 +2,12 @@ import os
 import base64
 import uuid
 import glob
+import json
+from io import BytesIO
 from flask import Flask, render_template, request, jsonify, url_for
 from google import genai
 from google.genai import types
-from PIL import Image
+from PIL import Image, PngImagePlugin
 
 app = Flask(__name__)
 app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0
@@ -14,6 +16,10 @@ app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0
 GENERATED_DIR = os.path.join(app.static_folder, 'generated')
 os.makedirs(GENERATED_DIR, exist_ok=True)
 
+# Ensure uploads directory exists
+UPLOADS_DIR = os.path.join(app.static_folder, 'uploads')
+os.makedirs(UPLOADS_DIR, exist_ok=True)
+
 @app.route('/')
 def index():
     return render_template('index.html')
@@ -29,6 +35,7 @@ def generate_image():
         resolution = form.get('resolution', '2K')
         api_key = form.get('api_key') or os.environ.get('GOOGLE_API_KEY')
         reference_files = request.files.getlist('reference_images')
+        reference_paths_json = form.get('reference_image_paths')
     else:
         data = request.get_json() or {}
         prompt = data.get('prompt')
@@ -36,6 +43,7 @@ def generate_image():
         resolution = data.get('resolution', '2K')
         api_key = data.get('api_key') or os.environ.get('GOOGLE_API_KEY')
         reference_files = []
+        reference_paths_json = data.get('reference_image_paths')
 
     if not prompt:
         return jsonify({'error': 'Prompt is required'}), 400
@@ -53,13 +61,88 @@ def generate_image():
         if aspect_ratio and aspect_ratio != 'Auto':
             image_config_args["aspect_ratio"] = aspect_ratio
 
+        # Process reference paths and files
+        final_reference_paths = []
         contents = [prompt]
-        for reference in reference_files:
+        
+        # Parse reference paths from frontend
+        frontend_paths = []
+        if reference_paths_json:
             try:
-                reference.stream.seek(0)
-                reference_image = Image.open(reference.stream)
-                contents.append(reference_image)
-            except Exception:
+                frontend_paths = json.loads(reference_paths_json)
+            except json.JSONDecodeError:
+                pass
+        
+        # If no paths provided but we have files (legacy or simple upload), treat all as new uploads
+        # But we need to handle the mix.
+        # Strategy: Iterate frontend_paths. If it looks like a path/URL, keep it.
+        # If it doesn't (or is null), consume from reference_files.
+        
+        file_index = 0
+        
+        # If frontend_paths is empty but we have files, just use the files
+        if not frontend_paths and reference_files:
+             for _ in reference_files:
+                 frontend_paths.append(None) # Placeholder for each file
+
+        for path in frontend_paths:
+            if path and (path.startswith('/') or path.startswith('http')):
+                # Existing path/URL
+                final_reference_paths.append(path)
+                # We also need to add the image content to the prompt
+                # We need to fetch it or read it if it's local (server-side local)
+                # If it's a URL we generated, it's in static/generated or static/uploads
+                # path might be "http://localhost:8888/static/generated/..." or "/static/generated/..."
+                
+                # Extract relative path to open file
+                # Assuming path contains '/static/'
+                try:
+                    if '/static/' in path:
+                        rel_path = path.split('/static/')[1]
+                        abs_path = os.path.join(app.static_folder, rel_path)
+                        if os.path.exists(abs_path):
+                            img = Image.open(abs_path)
+                            contents.append(img)
+                        else:
+                            print(f"Warning: Reference file not found at {abs_path}")
+                    else:
+                         print(f"Warning: Could not resolve local path for {path}")
+                except Exception as e:
+                    print(f"Error loading reference from path {path}: {e}")
+
+            elif file_index < len(reference_files):
+                # New upload
+                file = reference_files[file_index]
+                file_index += 1
+                
+                try:
+                    # Save to uploads
+                    ext = os.path.splitext(file.filename)[1]
+                    if not ext:
+                        ext = '.png'
+                    filename = f"{uuid.uuid4()}{ext}"
+                    filepath = os.path.join(UPLOADS_DIR, filename)
+                    
+                    # We need to read the file for Gemini AND save it
+                    # file.stream is a stream.
+                    file.stream.seek(0)
+                    file_bytes = file.read()
+                    
+                    with open(filepath, 'wb') as f:
+                        f.write(file_bytes)
+                        
+                    # Add to contents
+                    image = Image.open(BytesIO(file_bytes))
+                    contents.append(image)
+                    
+                    # Add to final paths
+                    # URL for the uploaded file
+                    rel_path = os.path.join('uploads', filename)
+                    file_url = url_for('static', filename=rel_path)
+                    final_reference_paths.append(file_url)
+                    
+                except Exception as e:
+                    print(f"Error processing uploaded file: {e}")
                     continue
 
         response = client.models.generate_content(
@@ -75,17 +158,36 @@ def generate_image():
             if part.inline_data:
                 image_bytes = part.inline_data.data
 
-                # Save image to file
+                image = Image.open(BytesIO(image_bytes))
+                png_info = PngImagePlugin.PngInfo()
+
                 filename = f"{uuid.uuid4()}.png"
                 filepath = os.path.join(GENERATED_DIR, filename)
-                with open(filepath, "wb") as f:
-                    f.write(image_bytes)
+                rel_path = os.path.join('generated', filename)
+                image_url = url_for('static', filename=rel_path)
 
-                image_url = url_for('static', filename=f'generated/{filename}')
-                image_data = base64.b64encode(image_bytes).decode('utf-8')
+                metadata = {
+                    'prompt': prompt,
+                    'aspect_ratio': aspect_ratio or 'Auto',
+                    'resolution': resolution,
+                    'reference_images': final_reference_paths,
+                }
+
+                png_info.add_text('sdvn_meta', json.dumps(metadata))
+
+                buffer = BytesIO()
+                image.save(buffer, format='PNG', pnginfo=png_info)
+                final_bytes = buffer.getvalue()
+
+                # Save image to file
+                with open(filepath, 'wb') as f:
+                    f.write(final_bytes)
+
+                image_data = base64.b64encode(final_bytes).decode('utf-8')
                 return jsonify({
                     'image': image_url,
                     'image_data': image_data,
+                    'metadata': metadata,
                 })
         
         return jsonify({'error': 'No image generated'}), 500
@@ -93,6 +195,27 @@ def generate_image():
     except Exception as e:
         return jsonify({'error': str(e)}), 500
 
+@app.route('/delete_image', methods=['POST'])
+def delete_image():
+    data = request.get_json()
+    filename = data.get('filename')
+    
+    if not filename:
+        return jsonify({'error': 'Filename is required'}), 400
+        
+    # Security check: ensure filename is just a basename, no paths
+    filename = os.path.basename(filename)
+    filepath = os.path.join(GENERATED_DIR, filename)
+    
+    if os.path.exists(filepath):
+        try:
+            os.remove(filepath)
+            return jsonify({'success': True})
+        except Exception as e:
+            return jsonify({'error': str(e)}), 500
+    else:
+        return jsonify({'error': 'File not found'}), 404
+
 @app.route('/gallery')
 def get_gallery():
     # List all png files in generated dir, sorted by modification time (newest first)

static/modules/gallery.js

@@ -0,0 +1,94 @@
+import { withCacheBuster } from './utils.js';
+import { extractMetadataFromBlob } from './metadata.js';
+
+export function createGallery({ galleryGrid, onSelect }) {
+    async function readMetadataFromImage(imageUrl) {
+        try {
+            const response = await fetch(withCacheBuster(imageUrl));
+            if (!response.ok) return null;
+            const blob = await response.blob();
+            return await extractMetadataFromBlob(blob);
+        } catch (error) {
+            console.warn('Unable to read gallery metadata', error);
+            return null;
+        }
+    }
+
+    async function load() {
+        if (!galleryGrid) return;
+        try {
+            const response = await fetch(`/gallery?t=${new Date().getTime()}`);
+            const data = await response.json();
+            galleryGrid.innerHTML = '';
+
+            data.images.forEach(imageUrl => {
+                const div = document.createElement('div');
+                div.className = 'gallery-item';
+                
+                // Image container for positioning
+                div.style.position = 'relative';
+
+                const img = document.createElement('img');
+                img.src = withCacheBuster(imageUrl);
+                img.loading = 'lazy';
+                img.draggable = true;
+                img.dataset.source = imageUrl;
+                
+                // Click to select
+                div.addEventListener('click', async (e) => {
+                    // Don't select if clicking delete button
+                    if (e.target.closest('.delete-btn')) return;
+                    
+                    const metadata = await readMetadataFromImage(imageUrl);
+                    await onSelect?.({ imageUrl, metadata });
+                    const siblings = galleryGrid.querySelectorAll('.gallery-item');
+                    siblings.forEach(el => el.classList.remove('active'));
+                    div.classList.add('active');
+                });
+
+                img.addEventListener('dragstart', event => {
+                    event.dataTransfer?.setData('text/uri-list', imageUrl);
+                    event.dataTransfer?.setData('text/plain', imageUrl);
+                    if (event.dataTransfer) {
+                        event.dataTransfer.effectAllowed = 'copy';
+                    }
+                });
+                
+                // Delete button
+                const deleteBtn = document.createElement('button');
+                deleteBtn.className = 'delete-btn';
+                deleteBtn.innerHTML = '×';
+                deleteBtn.title = 'Delete image';
+                deleteBtn.addEventListener('click', async (e) => {
+                    e.stopPropagation();
+                    if (!confirm('Are you sure you want to delete this image?')) return;
+                    
+                    const filename = imageUrl.split('/').pop().split('?')[0];
+                    try {
+                        const res = await fetch('/delete_image', {
+                            method: 'POST',
+                            headers: { 'Content-Type': 'application/json' },
+                            body: JSON.stringify({ filename })
+                        });
+                        
+                        if (res.ok) {
+                            div.remove();
+                        } else {
+                            console.error('Failed to delete image');
+                        }
+                    } catch (err) {
+                        console.error('Error deleting image:', err);
+                    }
+                });
+
+                div.appendChild(img);
+                div.appendChild(deleteBtn);
+                galleryGrid.appendChild(div);
+            });
+        } catch (error) {
+            console.error('Failed to load gallery:', error);
+        }
+    }
+
+    return { load };
+}

static/modules/metadata.js

@@ -0,0 +1,46 @@
+export async function extractMetadataFromBlob(blob, key = 'sdvn_meta') {
+    try {
+        const arrayBuffer = await blob.arrayBuffer();
+        if (arrayBuffer.byteLength < 8) return null;
+        const view = new DataView(arrayBuffer);
+        const signature = [137, 80, 78, 71, 13, 10, 26, 10];
+        for (let i = 0; i < signature.length; i++) {
+            if (view.getUint8(i) !== signature[i]) return null;
+        }
+
+        let offset = 8;
+        const decoder = new TextDecoder('utf-8');
+
+        while (offset + 12 <= view.byteLength) {
+            const length = view.getUint32(offset);
+            offset += 4;
+            const chunkTypeBytes = new Uint8Array(arrayBuffer, offset, 4);
+            const chunkType = decoder.decode(chunkTypeBytes);
+            offset += 4;
+
+            const chunkData = new Uint8Array(arrayBuffer, offset, length);
+            offset += length;
+            offset += 4; // skip CRC
+
+            if (chunkType === 'tEXt') {
+                const chunkText = decoder.decode(chunkData);
+                const nullIndex = chunkText.indexOf('\u0000');
+                if (nullIndex !== -1) {
+                    const chunkKey = chunkText.slice(0, nullIndex);
+                    const chunkValue = chunkText.slice(nullIndex + 1);
+                    if (chunkKey === key) {
+                        try {
+                            return JSON.parse(chunkValue);
+                        } catch (error) {
+                            console.warn('Invalid metadata JSON', error);
+                            return null;
+                        }
+                    }
+                }
+            }
+        }
+    } catch (error) {
+        console.warn('Unable to extract metadata', error);
+    }
+    return null;
+}

static/modules/popup.js

@@ -0,0 +1,57 @@
+export function setupHelpPopups({ buttonsSelector, overlayId, titleId, bodyId, closeBtnId, content }) {
+    const overlay = document.getElementById(overlayId);
+    const titleEl = document.getElementById(titleId);
+    const bodyEl = document.getElementById(bodyId);
+    const closeBtn = document.getElementById(closeBtnId);
+    const buttons = document.querySelectorAll(buttonsSelector);
+
+    if (!overlay || !titleEl || !bodyEl) return;
+
+    buttons.forEach(button => {
+        button.addEventListener('click', () => {
+            const target = button.dataset.popupTarget;
+            if (target) {
+                showPopup(target);
+            }
+        });
+    });
+
+    closeBtn?.addEventListener('click', closePopup);
+
+    overlay.addEventListener('click', event => {
+        if (event.target === overlay) {
+            closePopup();
+        }
+    });
+
+    document.addEventListener('keydown', event => {
+        if (event.key === 'Escape' && !overlay.classList.contains('hidden')) {
+            event.preventDefault();
+            closePopup();
+        }
+    });
+
+    function showPopup(type) {
+        const popupContent = content[type];
+        if (!popupContent) return;
+
+        titleEl.textContent = popupContent.title;
+        bodyEl.innerHTML = popupContent.sections
+            .map(section => {
+                const items = (section.items || []).map(item => `<li>${item}</li>`).join('');
+                return `
+                    <section class="popup-section">
+                        <h3>${section.heading}</h3>
+                        <ul>${items}</ul>
+                    </section>
+                `;
+            })
+            .join('');
+
+        overlay.classList.remove('hidden');
+    }
+
+    function closePopup() {
+        overlay.classList.add('hidden');
+    }
+}

static/modules/referenceSlots.js

@@ -0,0 +1,313 @@
+import { dataUrlToBlob, withCacheBuster } from './utils.js';
+
+export function createReferenceSlotManager(imageInputGrid, options = {}) {
+    const MAX_IMAGE_SLOTS = 16;
+    const INITIAL_IMAGE_SLOTS = 4;
+    const onChange = options.onChange;
+    const imageSlotState = [];
+    let cachedReferenceImages = [];
+
+    function initialize(initialCached = []) {
+        cachedReferenceImages = Array.isArray(initialCached) ? initialCached : [];
+        const requiredSlots = Math.min(
+            MAX_IMAGE_SLOTS,
+            Math.max(INITIAL_IMAGE_SLOTS, cachedReferenceImages.length + 1)
+        );
+
+        for (let i = 0; i < requiredSlots; i++) {
+            addImageSlot();
+        }
+
+        cachedReferenceImages.forEach((cached, index) => applyCachedImageToSlot(index, cached));
+        maybeAddSlot();
+    }
+
+    function getReferenceFiles() {
+        return imageSlotState
+            .filter(record => record.data && !record.data.sourceUrl) // Only return files if no sourceUrl
+            .map(record => getSlotFile(record))
+            .filter(Boolean);
+    }
+
+    function getReferencePaths() {
+        return imageSlotState.map(record => {
+            if (!record.data) return null;
+            return record.data.sourceUrl || record.data.file?.name || null;
+        });
+    }
+
+    function serializeReferenceImages() {
+        return imageSlotState
+            .map((record, index) => {
+                if (!record.data || !record.data.preview) return null;
+                const name = record.data.cached?.name || record.data.file?.name || `reference-${index + 1}.png`;
+                const type = record.data.cached?.type || record.data.file?.type || 'image/png';
+                return {
+                    name,
+                    type,
+                    dataUrl: record.data.preview,
+                    sourceUrl: record.data.sourceUrl,
+                };
+            })
+            .filter(Boolean);
+    }
+
+    function addImageSlot() {
+        if (!imageInputGrid || imageSlotState.length >= MAX_IMAGE_SLOTS) return;
+        const index = imageSlotState.length;
+        const slotElement = createImageSlotElement(index);
+        imageSlotState.push({ slot: slotElement, data: null });
+        imageInputGrid.appendChild(slotElement);
+    }
+
+    function createImageSlotElement(index) {
+        const slot = document.createElement('div');
+        slot.className = 'image-slot empty';
+        slot.dataset.index = index;
+
+        const placeholder = document.createElement('div');
+        placeholder.className = 'slot-placeholder';
+        placeholder.innerHTML = '<span class="slot-icon">+</span>';
+        slot.appendChild(placeholder);
+
+        const preview = document.createElement('img');
+        preview.className = 'slot-preview hidden';
+        preview.alt = 'Uploaded reference';
+        slot.appendChild(preview);
+
+        const removeBtn = document.createElement('button');
+        removeBtn.type = 'button';
+        removeBtn.className = 'slot-remove hidden';
+        removeBtn.setAttribute('aria-label', 'Remove image');
+        removeBtn.textContent = '×';
+        slot.appendChild(removeBtn);
+
+        const input = document.createElement('input');
+        input.type = 'file';
+        input.accept = 'image/*';
+        input.className = 'slot-input';
+        slot.appendChild(input);
+
+        slot.addEventListener('click', event => {
+            if (event.target === removeBtn) return;
+            input.click();
+        });
+
+        input.addEventListener('change', () => {
+            if (input.files && input.files.length) {
+                handleSlotFile(index, input.files[0]);
+            }
+        });
+
+        slot.addEventListener('dragenter', event => {
+            event.preventDefault();
+            slot.classList.add('drag-over');
+        });
+
+        slot.addEventListener('dragover', event => {
+            event.preventDefault();
+            slot.classList.add('drag-over');
+        });
+
+        slot.addEventListener('dragleave', () => {
+            slot.classList.remove('drag-over');
+        });
+
+        slot.addEventListener('drop', async event => {
+            event.preventDefault();
+            slot.classList.remove('drag-over');
+            const file = event.dataTransfer?.files?.[0];
+            if (file) {
+                handleSlotFile(index, file);
+                return;
+            }
+
+            const imageUrl = event.dataTransfer?.getData('text/uri-list')
+                || event.dataTransfer?.getData('text/plain');
+            if (imageUrl) {
+                await handleSlotDropFromHistory(index, imageUrl);
+            }
+        });
+
+        removeBtn.addEventListener('click', event => {
+            event.stopPropagation();
+            clearSlot(index);
+        });
+
+        return slot;
+    }
+
+    function handleSlotFile(index, file, sourceUrl = null) {
+        if (!file || !file.type.startsWith('image/')) return;
+        const reader = new FileReader();
+        reader.onload = () => {
+            const previewUrl = reader.result;
+            if (typeof previewUrl !== 'string') return;
+            const slotRecord = imageSlotState[index];
+            if (!slotRecord) return;
+            slotRecord.data = {
+                file,
+                preview: previewUrl,
+                cached: null,
+                sourceUrl: sourceUrl,
+            };
+            updateSlotVisual(index);
+            onChange?.();
+            maybeAddSlot();
+        };
+        reader.readAsDataURL(file);
+    }
+
+    async function handleSlotDropFromHistory(index, imageUrl) {
+        try {
+            const response = await fetch(withCacheBuster(imageUrl));
+            if (!response.ok) {
+                console.warn('Failed to fetch history image', response.statusText);
+                return;
+            }
+
+            const blob = await response.blob();
+            const name = imageUrl.split('/').pop()?.split('?')[0] || `history-${index + 1}.png`;
+            const type = blob.type || 'image/png';
+            const file = new File([blob], name, { type });
+            
+            // Extract relative path if possible, or use full URL
+            // Assuming imageUrl is like http://localhost:8888/static/generated/uuid.png
+            // We want /static/generated/uuid.png or just generated/uuid.png if that's how we store it.
+            // The app.py stores 'generated/filename.png' in metadata if we send it.
+            // But wait, app.py constructs image_url using url_for('static', filename=rel_path).
+            // Let's just store the full URL or relative path.
+            // If we store the full URL, we can fetch it back.
+            
+            let sourceUrl = imageUrl;
+            try {
+                const urlObj = new URL(imageUrl, window.location.origin);
+                if (urlObj.origin === window.location.origin) {
+                    sourceUrl = urlObj.pathname; 
+                }
+            } catch (e) {
+                // ignore
+            }
+
+            handleSlotFile(index, file, sourceUrl);
+        } catch (error) {
+            console.error('Unable to import history image', error);
+        }
+    }
+
+    function updateSlotVisual(index) {
+        const slotRecord = imageSlotState[index];
+        if (!slotRecord) return;
+        const slot = slotRecord.slot;
+        const placeholder = slot.querySelector('.slot-placeholder');
+        const preview = slot.querySelector('.slot-preview');
+        const removeBtn = slot.querySelector('.slot-remove');
+
+        if (slotRecord.data && slotRecord.data.preview) {
+            preview.src = slotRecord.data.preview;
+            preview.classList.remove('hidden');
+            placeholder.classList.add('hidden');
+            removeBtn.classList.remove('hidden');
+            slot.classList.add('filled');
+            slot.classList.remove('empty');
+        } else {
+            preview.src = '';
+            preview.classList.add('hidden');
+            placeholder.classList.remove('hidden');
+            removeBtn.classList.add('hidden');
+            slot.classList.add('empty');
+            slot.classList.remove('filled');
+        }
+    }
+
+    function clearSlot(index) {
+        const slotRecord = imageSlotState[index];
+        if (!slotRecord) return;
+        slotRecord.data = null;
+        const input = slotRecord.slot.querySelector('.slot-input');
+        if (input) input.value = '';
+        updateSlotVisual(index);
+        onChange?.();
+    }
+
+    function maybeAddSlot() {
+        const hasEmpty = imageSlotState.some(record => !record.data);
+        if (!hasEmpty && imageSlotState.length < MAX_IMAGE_SLOTS) {
+            addImageSlot();
+        }
+    }
+
+    function applyCachedImageToSlot(index, cached) {
+        if (!cached || !cached.dataUrl) return;
+        const slotRecord = imageSlotState[index];
+        if (!slotRecord) return;
+        slotRecord.data = {
+            file: null,
+            preview: cached.dataUrl,
+            cached: {
+                name: cached.name,
+                type: cached.type,
+                dataUrl: cached.dataUrl,
+            },
+            sourceUrl: cached.sourceUrl || null,
+        };
+        updateSlotVisual(index);
+    }
+
+    async function setReferenceImages(paths) {
+        if (!Array.isArray(paths)) return;
+        
+        // Clear existing slots first? Or overwrite?
+        // Let's overwrite from the beginning.
+        
+        // Ensure we have enough slots
+        while (imageSlotState.length < paths.length && imageSlotState.length < MAX_IMAGE_SLOTS) {
+            addImageSlot();
+        }
+
+        for (let i = 0; i < paths.length; i++) {
+            const path = paths[i];
+            if (!path) {
+                clearSlot(i);
+                continue;
+            }
+
+            // Check if it looks like a path we can fetch
+            if (path.startsWith('/') || path.startsWith('http')) {
+                await handleSlotDropFromHistory(i, path);
+            } else {
+                // It's likely just a filename of a local file we can't restore
+                // So we clear the slot
+                clearSlot(i);
+            }
+        }
+        
+        // Clear remaining slots
+        for (let i = paths.length; i < imageSlotState.length; i++) {
+            clearSlot(i);
+        }
+        
+        maybeAddSlot();
+    }
+
+    function getSlotFile(record) {
+        if (!record.data) return null;
+        if (record.data.file) return record.data.file;
+        if (record.data.cached && record.data.cached.dataUrl) {
+            const blob = dataUrlToBlob(record.data.cached.dataUrl);
+            if (!blob) return null;
+            const fileName = record.data.cached.name || `reference.png`;
+            const fileType = record.data.cached.type || 'image/png';
+            return new File([blob], fileName, { type: fileType });
+        }
+        return null;
+    }
+
+    return {
+        initialize,
+        getReferenceFiles,
+        getReferencePaths,
+        serializeReferenceImages,
+        setReferenceImages,
+    };
+}

static/modules/utils.js

@@ -0,0 +1,26 @@
+export function withCacheBuster(url) {
+    const separator = url.includes('?') ? '&' : '?';
+    return `${url}${separator}t=${new Date().getTime()}`;
+}
+
+export function clamp(value, min, max) {
+    return Math.min(Math.max(value, min), max);
+}
+
+export function dataUrlToBlob(dataUrl) {
+    try {
+        const [prefix, base64] = dataUrl.split(',');
+        const mimeMatch = prefix.match(/:(.*?);/);
+        const mime = mimeMatch ? mimeMatch[1] : 'image/png';
+        const binary = atob(base64);
+        const len = binary.length;
+        const buffer = new Uint8Array(len);
+        for (let i = 0; i < len; i++) {
+            buffer[i] = binary.charCodeAt(i);
+        }
+        return new Blob([buffer], { type: mime });
+    } catch (error) {
+        console.warn('Unable to convert cached image to blob', error);
+        return null;
+    }
+}

static/script.js

@@ -1,42 +1,15 @@
-document.addEventListener('DOMContentLoaded', () => {
-    const generateBtn = document.getElementById('generate-btn');
-    const promptInput = document.getElementById('prompt');
-    const aspectRatioInput = document.getElementById('aspect-ratio');
-    const resolutionInput = document.getElementById('resolution');
-    const apiKeyInput = document.getElementById('api-key');
+import { withCacheBuster, clamp } from './modules/utils.js';
+import { createGallery } from './modules/gallery.js';
+import { createReferenceSlotManager } from './modules/referenceSlots.js';
+import { setupHelpPopups } from './modules/popup.js';
+import { extractMetadataFromBlob } from './modules/metadata.js';
 
-    // States
-    const placeholderState = document.getElementById('placeholder-state');
-    const loadingState = document.getElementById('loading-state');
-    const errorState = document.getElementById('error-state');
-    const resultState = document.getElementById('result-state');
+const SETTINGS_STORAGE_KEY = 'gemini-image-app-settings';
+const ZOOM_STEP = 0.1;
+const MIN_ZOOM = 0.4;
+const MAX_ZOOM = 4;
 
-    const errorText = document.getElementById('error-text');
-    const generatedImage = document.getElementById('generated-image');
-    const downloadLink = document.getElementById('download-link');
-    const galleryGrid = document.getElementById('gallery-grid');
-    const imageInputGrid = document.getElementById('image-input-grid');
-    const SETTINGS_STORAGE_KEY = 'gemini-image-app-settings';
-    const MAX_IMAGE_SLOTS = 16;
-    const INITIAL_IMAGE_SLOTS = 4;
-    const imageSlotState = [];
-    let cachedReferenceImages = [];
-    const imageDisplayArea = document.querySelector('.image-display-area');
-    const canvasToolbar = document.querySelector('.canvas-toolbar');
-    const popupOverlay = document.getElementById('popup-overlay');
-    const popupTitleEl = document.getElementById('popup-title');
-    const popupBodyEl = document.getElementById('popup-body');
-    const popupCloseBtn = document.getElementById('popup-close');
-    const popupButtons = document.querySelectorAll('[data-popup-target]');
-    const ZOOM_STEP = 0.1;
-    const MIN_ZOOM = 0.4;
-    const MAX_ZOOM = 4;
-    let zoomLevel = 1;
-    let panOffset = { x: 0, y: 0 };
-    let isPanning = false;
-    let lastPointer = { x: 0, y: 0 };
-
-    const infoContent = {
+const infoContent = {
     title: 'Thông tin',
     sections: [
         {
@@ -48,9 +21,9 @@ document.addEventListener('DOMContentLoaded', () => {
             ],
         },
     ],
-    };
+};
 
-    const docsContent = {
+const docsContent = {
     title: 'Phím tắt và mẹo',
     sections: [
         {
@@ -58,7 +31,8 @@ document.addEventListener('DOMContentLoaded', () => {
             items: [
                 'Ctrl/Cmd + Enter → tạo ảnh mới',
                 'D → tải ảnh hiện tại',
-                    'R → reset zoom/pan vùng hiển thị ảnh',
+                'D → tải ảnh hiện tại',
+                'Space → reset zoom/pan vùng hiển thị ảnh',
                 'Esc → đóng popup thông tin/docs',
             ],
         },
@@ -71,17 +45,62 @@ document.addEventListener('DOMContentLoaded', () => {
             ],
         },
     ],
-    };
+};
 
-    const POPUP_CONTENT = {
+const POPUP_CONTENT = {
     info: infoContent,
     docs: docsContent,
-    };
+};
 
-    // Load gallery on start
-    loadSettings();
-    initializeImageInputs();
-    loadGallery();
+document.addEventListener('DOMContentLoaded', () => {
+    const generateBtn = document.getElementById('generate-btn');
+    const promptInput = document.getElementById('prompt');
+    const aspectRatioInput = document.getElementById('aspect-ratio');
+    const resolutionInput = document.getElementById('resolution');
+    const apiKeyInput = document.getElementById('api-key');
+
+    const placeholderState = document.getElementById('placeholder-state');
+    const loadingState = document.getElementById('loading-state');
+    const errorState = document.getElementById('error-state');
+    const resultState = document.getElementById('result-state');
+    const errorText = document.getElementById('error-text');
+    const generatedImage = document.getElementById('generated-image');
+    const downloadLink = document.getElementById('download-link');
+    const galleryGrid = document.getElementById('gallery-grid');
+    const imageInputGrid = document.getElementById('image-input-grid');
+    const imageDisplayArea = document.querySelector('.image-display-area');
+    const canvasToolbar = document.querySelector('.canvas-toolbar');
+
+    let zoomLevel = 1;
+    let panOffset = { x: 0, y: 0 };
+    let isPanning = false;
+    let lastPointer = { x: 0, y: 0 };
+
+    const slotManager = createReferenceSlotManager(imageInputGrid, {
+        onChange: persistSettings,
+    });
+
+    const gallery = createGallery({
+        galleryGrid,
+        onSelect: async ({ imageUrl, metadata }) => {
+            displayImage(imageUrl);
+            if (metadata) {
+                applyMetadata(metadata);
+            }
+        },
+    });
+
+    setupHelpPopups({
+        buttonsSelector: '[data-popup-target]',
+        overlayId: 'popup-overlay',
+        titleId: 'popup-title',
+        bodyId: 'popup-body',
+        closeBtnId: 'popup-close',
+        content: POPUP_CONTENT,
+    });
+
+    const savedSettings = loadSettings();
+    slotManager.initialize(savedSettings.referenceImages || []);
 
     apiKeyInput.addEventListener('input', persistSettings);
     promptInput.addEventListener('input', persistSettings);
@@ -99,7 +118,6 @@ document.addEventListener('DOMContentLoaded', () => {
             return;
         }
 
-        // Set UI to loading
         setViewState('loading');
         generateBtn.disabled = true;
 
@@ -124,12 +142,10 @@ document.addEventListener('DOMContentLoaded', () => {
 
             if (data.image) {
                 displayImage(data.image, data.image_data);
-                // Refresh gallery to show new image
-                loadGallery();
+                gallery.load();
             } else {
                 throw new Error('No image data received');
             }
-
         } catch (error) {
             showError(error.message);
         } finally {
@@ -137,6 +153,78 @@ document.addEventListener('DOMContentLoaded', () => {
         }
     });
 
+    document.addEventListener('keydown', handleGenerateShortcut);
+    document.addEventListener('keydown', handleResetShortcut);
+    document.addEventListener('keydown', handleDownloadShortcut);
+
+    if (imageDisplayArea) {
+        imageDisplayArea.addEventListener('wheel', handleCanvasWheel, { passive: false });
+        imageDisplayArea.addEventListener('pointerdown', handleCanvasPointerDown);
+        
+        // Drag and drop support
+        imageDisplayArea.addEventListener('dragover', (e) => {
+            e.preventDefault();
+            imageDisplayArea.classList.add('drag-over');
+        });
+
+        imageDisplayArea.addEventListener('dragleave', (e) => {
+            e.preventDefault();
+            imageDisplayArea.classList.remove('drag-over');
+        });
+
+        imageDisplayArea.addEventListener('drop', async (e) => {
+            e.preventDefault();
+            imageDisplayArea.classList.remove('drag-over');
+            
+            const files = e.dataTransfer?.files;
+            if (files && files.length > 0) {
+                const file = files[0];
+                if (file.type.startsWith('image/')) {
+                    try {
+                        // Display image immediately
+                        const objectUrl = URL.createObjectURL(file);
+                        displayImage(objectUrl);
+                        
+                        // Extract and apply metadata
+                        const metadata = await extractMetadataFromBlob(file);
+                        if (metadata) {
+                            applyMetadata(metadata);
+                        }
+                    } catch (error) {
+                        console.error('Error handling dropped image:', error);
+                    }
+                }
+            }
+            else {
+                const imageUrl = e.dataTransfer?.getData('text/uri-list')
+                    || e.dataTransfer?.getData('text/plain');
+                if (imageUrl) {
+                    await handleCanvasDropUrl(imageUrl.trim());
+                }
+            }
+        });
+    }
+
+    if (canvasToolbar) {
+        canvasToolbar.addEventListener('click', handleCanvasToolbarClick);
+    }
+
+    document.addEventListener('pointermove', handleCanvasPointerMove);
+    document.addEventListener('pointerup', () => {
+        if (isPanning && imageDisplayArea) {
+            imageDisplayArea.style.cursor = 'grab';
+        }
+        isPanning = false;
+    });
+    document.addEventListener('pointerleave', () => {
+        if (isPanning && imageDisplayArea) {
+            imageDisplayArea.style.cursor = 'grab';
+        }
+        isPanning = false;
+    });
+
+    loadGallery();
+
     function setViewState(state) {
         placeholderState.classList.add('hidden');
         loadingState.classList.add('hidden');
@@ -159,49 +247,16 @@ document.addEventListener('DOMContentLoaded', () => {
         }
     }
 
-    document.addEventListener('keydown', handleGenerateShortcut);
-    document.addEventListener('keydown', handleResetShortcut);
-    document.addEventListener('keydown', handleDownloadShortcut);
-
-    function handleGenerateShortcut(event) {
-        if ((event.ctrlKey || event.metaKey) && event.key === 'Enter') {
-            event.preventDefault();
-            if (generateBtn && !generateBtn.disabled) {
-                generateBtn.click();
-            }
-        }
-    }
-
-    if (imageDisplayArea) {
-        imageDisplayArea.addEventListener('wheel', handleCanvasWheel, { passive: false });
-        imageDisplayArea.addEventListener('pointerdown', handleCanvasPointerDown);
-    }
-
-    if (canvasToolbar) {
-        canvasToolbar.addEventListener('click', handleCanvasToolbarClick);
-    }
-
-    document.addEventListener('pointermove', handleCanvasPointerMove);
-    document.addEventListener('pointerup', () => {
-        if (isPanning && imageDisplayArea) {
-            imageDisplayArea.style.cursor = 'grab';
-        }
-        isPanning = false;
-    });
-    document.addEventListener('pointerleave', () => {
-        if (isPanning && imageDisplayArea) {
-            imageDisplayArea.style.cursor = 'grab';
-        }
-        isPanning = false;
-    });
-
     function showError(message) {
         errorText.textContent = message;
         setViewState('error');
     }
 
     function displayImage(imageUrl, imageData) {
-        const cacheBustedUrl = withCacheBuster(imageUrl);
+        let cacheBustedUrl = imageUrl;
+        if (!imageUrl.startsWith('blob:') && !imageUrl.startsWith('data:')) {
+            cacheBustedUrl = withCacheBuster(imageUrl);
+        }
 
         if (imageData) {
             generatedImage.src = `data:image/png;base64,${imageData}`;
@@ -220,49 +275,42 @@ document.addEventListener('DOMContentLoaded', () => {
         setViewState('result');
     }
 
+    async function handleCanvasDropUrl(imageUrl) {
+        const cleanedUrl = imageUrl;
+        displayImage(cleanedUrl);
+        try {
+            const response = await fetch(withCacheBuster(cleanedUrl));
+            if (!response.ok) return;
+            const metadata = await extractMetadataFromBlob(await response.blob());
+            if (metadata) {
+                applyMetadata(metadata);
+            }
+        } catch (error) {
+            console.warn('Unable to read metadata from dropped image', error);
+        }
+    }
+
+    function applyMetadata(metadata) {
+        if (!metadata) return;
+        if (metadata.prompt) promptInput.value = metadata.prompt;
+        if (metadata.aspect_ratio) aspectRatioInput.value = metadata.aspect_ratio;
+        if (metadata.resolution) resolutionInput.value = metadata.resolution;
+        
+        if (metadata.reference_images && Array.isArray(metadata.reference_images)) {
+            slotManager.setReferenceImages(metadata.reference_images);
+        }
+        
+        persistSettings();
+    }
+
     async function loadGallery() {
         try {
-            const response = await fetch(`/gallery?t=${new Date().getTime()}`);
-            const data = await response.json();
-            
-            galleryGrid.innerHTML = '';
-            
-            data.images.forEach(imageUrl => {
-                const div = document.createElement('div');
-                div.className = 'gallery-item';
-                div.onclick = () => {
-                    displayImage(imageUrl);
-                    // Update active state
-                    document.querySelectorAll('.gallery-item').forEach(el => el.classList.remove('active'));
-                    div.classList.add('active');
-                };
-
-                const img = document.createElement('img');
-                img.src = withCacheBuster(imageUrl);
-                img.loading = 'lazy';
-                img.draggable = true;
-                img.dataset.source = imageUrl;
-                img.addEventListener('dragstart', event => {
-                    event.dataTransfer?.setData('text/uri-list', imageUrl);
-                    event.dataTransfer?.setData('text/plain', imageUrl);
-                    if (event.dataTransfer) {
-                        event.dataTransfer.effectAllowed = 'copy';
-                    }
-                });
-
-                div.appendChild(img);
-                galleryGrid.appendChild(div);
-            });
+            await gallery.load();
         } catch (error) {
-            console.error('Failed to load gallery:', error);
+            console.error('Unable to populate gallery', error);
         }
     }
 
-    function withCacheBuster(url) {
-        const separator = url.includes('?') ? '&' : '?';
-        return `${url}${separator}t=${new Date().getTime()}`;
-    }
-
     function buildGenerateFormData(fields) {
         const formData = new FormData();
 
@@ -272,30 +320,33 @@ document.addEventListener('DOMContentLoaded', () => {
             }
         });
 
-        imageSlotState.forEach(record => {
-            const slotFile = getSlotFile(record);
-            if (slotFile) {
-                formData.append('reference_images', slotFile, slotFile.name);
-            }
+        slotManager.getReferenceFiles().forEach(file => {
+            formData.append('reference_images', file, file.name);
         });
         
+        const referencePaths = slotManager.getReferencePaths();
+        if (referencePaths && referencePaths.length > 0) {
+            formData.append('reference_image_paths', JSON.stringify(referencePaths));
+        }
+
         return formData;
     }
 
     function loadSettings() {
-        if (typeof localStorage === 'undefined') return;
+        if (typeof localStorage === 'undefined') return {};
         try {
             const saved = localStorage.getItem(SETTINGS_STORAGE_KEY);
-            if (!saved) return;
+            if (!saved) return {};
 
             const { apiKey, aspectRatio, resolution, prompt, referenceImages } = JSON.parse(saved);
             if (apiKey) apiKeyInput.value = apiKey;
             if (aspectRatio) aspectRatioInput.value = aspectRatio;
             if (resolution) resolutionInput.value = resolution;
             if (prompt) promptInput.value = prompt;
-            cachedReferenceImages = Array.isArray(referenceImages) ? referenceImages : [];
+            return { apiKey, aspectRatio, resolution, prompt, referenceImages };
         } catch (error) {
             console.warn('Unable to load cached settings', error);
+            return {};
         }
     }
 
@@ -307,7 +358,7 @@ document.addEventListener('DOMContentLoaded', () => {
                 aspectRatio: aspectRatioInput.value,
                 resolution: resolutionInput.value,
                 prompt: promptInput.value.trim(),
-                referenceImages: serializeReferenceImages(),
+                referenceImages: slotManager.serializeReferenceImages(),
             };
             localStorage.setItem(SETTINGS_STORAGE_KEY, JSON.stringify(settings));
         } catch (error) {
@@ -315,6 +366,37 @@ document.addEventListener('DOMContentLoaded', () => {
         }
     }
 
+    function handleGenerateShortcut(event) {
+        if ((event.ctrlKey || event.metaKey) && event.key === 'Enter') {
+            event.preventDefault();
+            if (generateBtn && !generateBtn.disabled) {
+                generateBtn.click();
+            }
+        }
+    }
+
+    function handleResetShortcut(event) {
+        if (event.code !== 'Space' && event.key !== ' ') return;
+        if (event.ctrlKey || event.metaKey || event.altKey) return;
+        const targetTag = event.target?.tagName;
+        if (targetTag && ['INPUT', 'TEXTAREA', 'SELECT'].includes(targetTag)) return;
+        if (event.target?.isContentEditable) return;
+        if (resultState.classList.contains('hidden')) return;
+        event.preventDefault();
+        resetView();
+    }
+
+    function handleDownloadShortcut(event) {
+        if (event.key !== 'd') return;
+        if (event.ctrlKey || event.metaKey || event.altKey) return;
+        const targetTag = event.target?.tagName;
+        if (targetTag && ['INPUT', 'TEXTAREA', 'SELECT'].includes(targetTag)) return;
+        if (event.target?.isContentEditable) return;
+        if (resultState.classList.contains('hidden')) return;
+        event.preventDefault();
+        downloadLink.click();
+    }
+
     function handleCanvasWheel(event) {
         if (resultState.classList.contains('hidden')) return;
         event.preventDefault();
@@ -390,328 +472,4 @@ document.addEventListener('DOMContentLoaded', () => {
         panOffset = { x: 0, y: 0 };
         setImageTransform();
     }
-
-    function clamp(value, min, max) {
-        return Math.min(Math.max(value, min), max);
-    }
-
-    function handleResetShortcut(event) {
-        if (event.key !== 'r') return;
-        if (event.ctrlKey || event.metaKey || event.altKey) return;
-        const targetTag = event.target?.tagName;
-        if (targetTag && ['INPUT', 'TEXTAREA', 'SELECT'].includes(targetTag)) return;
-        if (event.target?.isContentEditable) return;
-        if (resultState.classList.contains('hidden')) return;
-        event.preventDefault();
-        resetView();
-    }
-
-    function handleDownloadShortcut(event) {
-        if (event.key !== 'd') return;
-        if (event.ctrlKey || event.metaKey || event.altKey) return;
-        const targetTag = event.target?.tagName;
-        if (targetTag && ['INPUT', 'TEXTAREA', 'SELECT'].includes(targetTag)) return;
-        if (event.target?.isContentEditable) return;
-        if (resultState.classList.contains('hidden')) return;
-        event.preventDefault();
-        downloadLink.click();
-    }
-
-    function initializeImageInputs() {
-        if (!imageInputGrid) return;
-        const requiredSlots = Math.min(
-            MAX_IMAGE_SLOTS,
-            Math.max(INITIAL_IMAGE_SLOTS, cachedReferenceImages.length + 1)
-        );
-        for (let i = 0; i < requiredSlots; i++) {
-            addImageSlot();
-        }
-        cachedReferenceImages.forEach((cached, index) => {
-            applyCachedImageToSlot(index, cached);
-        });
-        maybeAddSlot();
-    }
-
-    function applyCachedImageToSlot(index, cached) {
-        if (!cached || !cached.dataUrl) return;
-        const slotRecord = imageSlotState[index];
-        if (!slotRecord) return;
-        slotRecord.data = {
-            file: null,
-            preview: cached.dataUrl,
-            cached: {
-                name: cached.name,
-                type: cached.type,
-                dataUrl: cached.dataUrl,
-            },
-        };
-        updateSlotVisual(index);
-    }
-
-    function addImageSlot() {
-        if (!imageInputGrid || imageSlotState.length >= MAX_IMAGE_SLOTS) return;
-        const index = imageSlotState.length;
-        const slotElement = createImageSlotElement(index);
-        imageSlotState.push({
-            slot: slotElement,
-            data: null,
-        });
-        imageInputGrid.appendChild(slotElement);
-    }
-
-    function createImageSlotElement(index) {
-        const slot = document.createElement('div');
-        slot.className = 'image-slot empty';
-        slot.dataset.index = index;
-
-        const placeholder = document.createElement('div');
-        placeholder.className = 'slot-placeholder';
-        placeholder.innerHTML = '<span class="slot-icon">+</span>';
-        slot.appendChild(placeholder);
-
-        const preview = document.createElement('img');
-        preview.className = 'slot-preview hidden';
-        preview.alt = 'Uploaded reference';
-        slot.appendChild(preview);
-
-        const removeBtn = document.createElement('button');
-        removeBtn.type = 'button';
-        removeBtn.className = 'slot-remove hidden';
-        removeBtn.setAttribute('aria-label', 'Remove image');
-        removeBtn.textContent = '×';
-        slot.appendChild(removeBtn);
-
-        const input = document.createElement('input');
-        input.type = 'file';
-        input.accept = 'image/*';
-        input.className = 'slot-input';
-        slot.appendChild(input);
-
-        slot.addEventListener('click', event => {
-            if (event.target === removeBtn) return;
-            input.click();
-        });
-
-        input.addEventListener('change', () => {
-            if (input.files && input.files.length) {
-                handleSlotFile(index, input.files[0]);
-            }
-        });
-
-        slot.addEventListener('dragenter', event => {
-            event.preventDefault();
-            slot.classList.add('drag-over');
-        });
-
-        slot.addEventListener('dragover', event => {
-            event.preventDefault();
-            slot.classList.add('drag-over');
-        });
-
-        slot.addEventListener('dragleave', () => {
-            slot.classList.remove('drag-over');
-        });
-
-        slot.addEventListener('drop', async event => {
-            event.preventDefault();
-            slot.classList.remove('drag-over');
-            const file = event.dataTransfer?.files?.[0];
-            if (file) {
-                handleSlotFile(index, file);
-                return;
-            }
-
-            const imageUrl = event.dataTransfer?.getData('text/uri-list')
-                || event.dataTransfer?.getData('text/plain');
-            if (imageUrl) {
-                await handleSlotDropFromHistory(index, imageUrl);
-            }
-        });
-
-        removeBtn.addEventListener('click', event => {
-            event.stopPropagation();
-            clearSlot(index);
-        });
-
-        return slot;
-    }
-
-    function handleSlotFile(index, file) {
-        if (!file || !file.type.startsWith('image/')) return;
-        const reader = new FileReader();
-        reader.onload = () => {
-            const previewUrl = reader.result;
-            if (typeof previewUrl !== 'string') return;
-            const slotRecord = imageSlotState[index];
-            if (!slotRecord) return;
-            slotRecord.data = {
-                file,
-                preview: previewUrl,
-                cached: null,
-            };
-            updateSlotVisual(index);
-            persistSettings();
-            maybeAddSlot();
-        };
-        reader.readAsDataURL(file);
-    }
-
-    async function handleSlotDropFromHistory(index, imageUrl) {
-        try {
-            const response = await fetch(withCacheBuster(imageUrl));
-            if (!response.ok) {
-                console.warn('Failed to fetch history image', response.statusText);
-                return;
-            }
-
-            const blob = await response.blob();
-            const name = imageUrl.split('/').pop()?.split('?')[0] || `history-${index + 1}.png`;
-            const type = blob.type || 'image/png';
-            const file = new File([blob], name, { type });
-            handleSlotFile(index, file);
-        } catch (error) {
-            console.error('Unable to import history image', error);
-        }
-    }
-
-    function updateSlotVisual(index) {
-        const slotRecord = imageSlotState[index];
-        if (!slotRecord) return;
-        const slot = slotRecord.slot;
-        const placeholder = slot.querySelector('.slot-placeholder');
-        const preview = slot.querySelector('.slot-preview');
-        const removeBtn = slot.querySelector('.slot-remove');
-
-        if (slotRecord.data && slotRecord.data.preview) {
-            preview.src = slotRecord.data.preview;
-            preview.classList.remove('hidden');
-            placeholder.classList.add('hidden');
-            removeBtn.classList.remove('hidden');
-            slot.classList.add('filled');
-            slot.classList.remove('empty');
-        } else {
-            preview.src = '';
-            preview.classList.add('hidden');
-            placeholder.classList.remove('hidden');
-            removeBtn.classList.add('hidden');
-            slot.classList.add('empty');
-            slot.classList.remove('filled');
-        }
-    }
-
-    function clearSlot(index) {
-        const slotRecord = imageSlotState[index];
-        if (!slotRecord) return;
-        slotRecord.data = null;
-        const input = slotRecord.slot.querySelector('.slot-input');
-        if (input) input.value = '';
-        updateSlotVisual(index);
-        persistSettings();
-    }
-
-    function maybeAddSlot() {
-        const hasEmpty = imageSlotState.some(record => !record.data);
-        if (!hasEmpty && imageSlotState.length < MAX_IMAGE_SLOTS) {
-            addImageSlot();
-        }
-    }
-
-    function serializeReferenceImages() {
-        return imageSlotState
-            .map((record, index) => {
-                if (!record.data || !record.data.preview) return null;
-                const name = record.data.cached?.name || record.data.file?.name || `reference-${index + 1}.png`;
-                const type = record.data.cached?.type || record.data.file?.type || 'image/png';
-                return {
-                    name,
-                    type,
-                    dataUrl: record.data.preview,
-                };
-            })
-            .filter(Boolean);
-    }
-
-    function getSlotFile(record) {
-        if (!record.data) return null;
-        if (record.data.file) return record.data.file;
-        if (record.data.cached && record.data.cached.dataUrl) {
-            const blob = dataUrlToBlob(record.data.cached.dataUrl);
-            if (!blob) return null;
-            const fileName = record.data.cached.name || `reference.png`;
-            const fileType = record.data.cached.type || 'image/png';
-            return new File([blob], fileName, { type: fileType });
-        }
-        return null;
-    }
-
-    function dataUrlToBlob(dataUrl) {
-        try {
-            const [prefix, base64] = dataUrl.split(',');
-            const mimeMatch = prefix.match(/:(.*?);/);
-            const mime = mimeMatch ? mimeMatch[1] : 'image/png';
-            const binary = atob(base64);
-            const len = binary.length;
-            const buffer = new Uint8Array(len);
-            for (let i = 0; i < len; i++) {
-                buffer[i] = binary.charCodeAt(i);
-            }
-            return new Blob([buffer], { type: mime });
-        } catch (error) {
-            console.warn('Unable to convert cached image to blob', error);
-            return null;
-        }
-    }
-
-    popupButtons.forEach(button => {
-        button.addEventListener('click', () => {
-            const target = button.dataset.popupTarget;
-            if (target) {
-                showPopup(target);
-            }
-        });
-    });
-
-    if (popupCloseBtn) {
-        popupCloseBtn.addEventListener('click', closePopup);
-    }
-
-    if (popupOverlay) {
-        popupOverlay.addEventListener('click', event => {
-            if (event.target === popupOverlay) {
-                closePopup();
-            }
-        });
-    }
-
-    document.addEventListener('keydown', event => {
-        if (event.key === 'Escape' && popupOverlay && !popupOverlay.classList.contains('hidden')) {
-            event.preventDefault();
-            closePopup();
-        }
-    });
-
-    function showPopup(type) {
-        const content = POPUP_CONTENT[type];
-        if (!content || !popupOverlay || !popupBodyEl || !popupTitleEl) return;
-
-        popupTitleEl.textContent = content.title;
-        popupBodyEl.innerHTML = content.sections
-            .map(section => {
-                const items = (section.items || []).map(item => `<li>${item}</li>`).join('');
-                return `
-                    <section class="popup-section">
-                        <h3>${section.heading}</h3>
-                        <ul>${items}</ul>
-                    </section>
-                `;
-            })
-            .join('');
-
-        popupOverlay.classList.remove('hidden');
-    }
-
-    function closePopup() {
-        if (!popupOverlay) return;
-        popupOverlay.classList.add('hidden');
-    }
 });

static/style.css

@@ -32,6 +32,17 @@ body {
     transition: background 0.6s ease;
 }
 
+a {
+    color: var(--accent-color);
+    text-decoration: none;
+    transition: color 0.2s;
+}
+
+a:hover {
+    color: var(--accent-hover);
+    text-decoration: underline;
+}
+
 .app-container {
     display: flex;
     height: 100vh;
@@ -423,6 +434,13 @@ button#generate-btn:disabled {
     min-height: 0;
 }
 
+.image-display-area.drag-over {
+    border-color: rgba(251, 191, 36, 0.8);
+    box-shadow: 0 30px 60px rgba(9, 5, 25, 0.7), inset 0 0 60px rgba(250, 204, 21, 0.25);
+    background: radial-gradient(circle at top, rgba(255, 255, 255, 0.08), rgba(6, 6, 18, 0.95));
+    backdrop-filter: blur(8px);
+}
+
 .state-view {
     width: 100%;
     height: 100%;
@@ -675,6 +693,35 @@ button#generate-btn:disabled {
     object-fit: cover;
 }
 
+.gallery-item .delete-btn {
+    position: absolute;
+    top: 4px;
+    right: 4px;
+    width: 20px;
+    height: 20px;
+    border-radius: 50%;
+    background: rgba(0, 0, 0, 0.6);
+    color: white;
+    border: none;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    opacity: 0;
+    transition: opacity 0.2s, background 0.2s;
+    font-size: 14px;
+    line-height: 1;
+    z-index: 10;
+}
+
+.gallery-item:hover .delete-btn {
+    opacity: 1;
+}
+
+.gallery-item .delete-btn:hover {
+    background: rgba(255, 68, 68, 0.9);
+}
+
 /* Spinner */
 .spinner {
     width: 50px;

templates/index.html

@@ -129,7 +129,7 @@
             <div id="popup-body" class="popup-body"></div>
         </div>
     </div>
-    <script src="{{ url_for('static', filename='script.js') }}"></script>
+    <script type="module" src="{{ url_for('static', filename='script.js') }}"></script>
 </body>
 
 </html>