feat: Add backfill script for image brightness stats and display them in the UI.

backfill_stats.js

@@ -0,0 +1,112 @@
+
+import fs from 'fs';
+import path from 'path';
+import sharp from 'sharp';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const UPLOAD_DIR = process.env.PICUPPER_UPLOAD_DIR || path.join(__dirname, 'uploads');
+
+async function processDirectory(dir) {
+    const entries = fs.readdirSync(dir, { withFileTypes: true });
+
+    // Check if we are in a leaf "day" directory (has images)
+    const images = entries.filter(e => e.isFile() && /\.(jpg|jpeg|png|webp)$/i.test(e.name) && !e.name.includes('_thumb'));
+
+    if (images.length > 0) {
+        console.log(`Processing directory: ${dir}`);
+        const statsFile = path.join(dir, 'stats.json');
+        let stats = [];
+
+        if (fs.existsSync(statsFile)) {
+            try {
+                stats = JSON.parse(fs.readFileSync(statsFile, 'utf8'));
+            } catch (e) {
+                console.error(`Error reading ${statsFile}`, e.message);
+            }
+        }
+
+        // Create a set of existing filenames for fast lookup
+        const processedFiles = new Set(stats.map(s => s.filename));
+        let updated = false;
+
+        for (const img of images) {
+            if (processedFiles.has(img.name)) continue;
+
+            const imgPath = path.join(dir, img.name);
+            console.log(`  Computing brightness for ${img.name}...`);
+
+            try {
+                const image = sharp(imgPath);
+                const s = await image.stats();
+                const brightness = Math.round((s.channels[0].mean + s.channels[1].mean + s.channels[2].mean) / 3);
+
+                // Try to extract timestamp from filename: {cameraId}_{timestamp}.{ext}
+                // Timestamp in filename is usually ISO like 2024-12-19T14-00-00-000Z but with - instead of :
+                // We need a valid ISO string for consistency.
+
+                // Filename format: {cameraId}_YYYY-MM-DDTHH-mm-ss-sssZ.{ext}
+                // extract YYYY-MM-DDTHH-mm-ss-sssZ
+                let timestamp = new Date().toISOString();
+                const match = img.name.match(/_(\d{4}-\d{2}-\d{2}T[\d-]+Z)\./);
+                if (match) {
+                    // Replace - with : in time part for standard ISO parseability if needed, 
+                    // or just store as is if that's what we did in server.js.
+                    // In server.js: new Date().toISOString().replace(/[:.]/g, '-') was used for filename.
+                    // For the stats entry, server.js uses new Date().toISOString() (standard ISO with colons).
+
+                    // Reconstruct standard ISO
+                    // stored format: 2025-12-19T14-25-00-123Z
+                    // target: 2025-12-19T14:25:00.123Z
+                    const rawTs = match[1];
+                    const parts = rawTs.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2})-(\d{2})-(\d{2})-(\d{3})Z/);
+                    if (parts) {
+                        timestamp = `${parts[1]}-${parts[2]}-${parts[3]}T${parts[4]}:${parts[5]}:${parts[6]}.${parts[7]}Z`;
+                    } else {
+                        // Fallback for older formats if any
+                        timestamp = rawTs;
+                    }
+                } else {
+                    // Fallback to file mtime
+                    const fstats = fs.statSync(imgPath);
+                    timestamp = fstats.mtime.toISOString();
+                }
+
+                stats.push({
+                    timestamp: timestamp,
+                    filename: img.name,
+                    brightness: brightness
+                });
+                updated = true;
+            } catch (err) {
+                console.error(`  Failed to process ${img.name}:`, err.message);
+            }
+        }
+
+        if (updated) {
+            // Sort by timestamp
+            stats.sort((a, b) => a.timestamp.localeCompare(b.timestamp));
+            fs.writeFileSync(statsFile, JSON.stringify(stats, null, 2));
+            console.log(`  Updated ${statsFile} with new entries.`);
+        } else {
+            console.log(`  No new images to process.`);
+        }
+    }
+
+    // Recurse into subdirectories
+    for (const entry of entries) {
+        if (entry.isDirectory()) {
+            await processDirectory(path.join(dir, entry.name));
+        }
+    }
+}
+
+// Start
+console.log(`Starting brightness backfill in ${UPLOAD_DIR}...`);
+processDirectory(UPLOAD_DIR).then(() => {
+    console.log('Done!');
+}).catch(err => {
+    console.error('Fatal error:', err);
+});

public/index.html

@@ -173,6 +173,13 @@
         <div id="loader" class="loader">Loading images...</div>
         <div id="grid" class="grid"></div>
         <div id="empty" class="empty">Select a camera and date to view images</div>
+
+        <!-- Brightness Chart -->
+        <div id="chartContainer"
+            style="margin-top: 40px; background: var(--card-bg); padding: 20px; border-radius: 8px; display: none;">
+            <h3>Brightness Levels</h3>
+            <canvas id="brightnessChart" style="width: 100%; height: 200px;"></canvas>
+        </div>
     </div>
 
     <!-- Lightbox Modal -->
@@ -292,7 +299,7 @@
             }
         }
 
-        async function loadImages() {
+        async function loadImages(isAutoUpdate = false) {
             const cameraId = cameraSelect.value;
             const dateStr = dateSelect.value; // YYYY-MM-DD
 
@@ -304,9 +311,12 @@
             localStorage.setItem('lastCamera', cameraId);
             localStorage.setItem('lastDate', dateStr);
 
-            loader.style.display = 'block';
+            if (!isAutoUpdate) {
-            grid.innerHTML = '';
+                loader.style.display = 'block';
-            emptyMsg.style.display = 'none';
+                grid.innerHTML = '';
+                emptyMsg.style.display = 'none';
+                document.getElementById('chartContainer').style.display = 'none';
+            }
 
             const [year, month, day] = dateStr.split('-');
 
@@ -314,21 +324,31 @@
                 const res = await fetch(`cameras/${cameraId}/${year}/${month}/${day}`);
                 const data = await res.json();
 
-                loader.style.display = 'none';
+                if (!isAutoUpdate) {
+                    loader.style.display = 'none';
+                }
 
                 if (data.images.length === 0) {
-                    emptyMsg.style.display = 'block';
+                    if (!isAutoUpdate) emptyMsg.style.display = 'block';
                     return;
                 }
 
+                // For auto-update, assume we have data now, clear grid to rebuild
+                if (isAutoUpdate) {
+                    grid.innerHTML = '';
+                }
+
                 // Group by hour
                 const hours = {};
                 data.images.forEach(img => {
                     let h = '00';
                     try {
-                        const match = img.timestamp.match(/(\d{2})[-:](\d{2})[-:](\d{2})/);
+                        // Parse UTC timestamp from filename and convert to local time
-                        if (match) {
+                        const parts = img.timestamp.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2})[-:](\d{2})[-:](\d{2})/);
-                            h = match[1];
+                        if (parts) {
+                            const [_, y, m, d, hUtc, mUtc, sUtc] = parts;
+                            const date = new Date(Date.UTC(y, m - 1, d, hUtc, mUtc, sUtc));
+                            h = String(date.getHours()).padStart(2, '0');
                         } else {
                             const d = new Date(img.timestamp);
                             if (!isNaN(d.getTime())) h = String(d.getHours()).padStart(2, '0');
@@ -347,10 +367,11 @@
 
                     const card = document.createElement('div');
                     card.className = 'card';
-                    card.dataset.idx = 0; // Current viewed index
+                    const lastIdx = group.length - 1;
+                    card.dataset.idx = lastIdx; // Default to last (newest)
 
                     const thumb = document.createElement('img');
-                    thumb.src = group[0].thumbnailUrl;
+                    thumb.src = group[lastIdx].thumbnailUrl;
 
                     const info = document.createElement('div');
                     info.className = 'card-info';
@@ -375,7 +396,12 @@
                     };
 
                     card.onmouseleave = () => {
-                        // Optional: could reset here
+                        const lastIdx = group.length - 1;
+                        if (card.dataset.idx != lastIdx) {
+                            thumb.src = group[lastIdx].thumbnailUrl;
+                            card.dataset.idx = lastIdx;
+                            info.textContent = `${hour}:00 (${group.length} pics)`;
+                        }
                     };
 
                     card.onclick = () => {
@@ -388,16 +414,116 @@
                     grid.appendChild(card);
                 });
 
+                // Draw brightness chart if stats exist
+                if (data.stats && data.stats.length > 0) {
+                    document.getElementById('chartContainer').style.display = 'block';
+                    drawChart(data.stats);
+                }
+
             } catch (err) {
                 loader.style.display = 'none';
                 console.error(err);
                 grid.innerHTML = '<div style="color:red">Error loading images</div>';
+                document.getElementById('chartContainer').style.display = 'none';
+            }
+        }
+
+        function drawChart(stats) {
+            const canvas = document.getElementById('brightnessChart');
+            const ctx = canvas.getContext('2d');
+
+            // Resize canvas to match display size
+            const rect = canvas.parentNode.getBoundingClientRect();
+            canvas.width = rect.width;
+            canvas.height = 200;
+
+            const width = canvas.width;
+            const height = canvas.height;
+            const padding = { top: 20, right: 20, bottom: 30, left: 40 };
+
+            ctx.clearRect(0, 0, width, height);
+
+            // Sort stats by timestamp just in case
+            stats.sort((a, b) => a.timestamp.localeCompare(b.timestamp));
+
+            // Helper to parsing time to minutes from start of day (local time)
+            const getMinutes = (iso) => {
+                // Parse UCT timestamp to Date object
+                const parts = iso.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2})[-:](\d{2})[-:](\d{2})/);
+                let d;
+                if (parts) {
+                    const [_, y, m, day, hUtc, mUtc, sUtc] = parts;
+                    d = new Date(Date.UTC(y, m - 1, day, hUtc, mUtc, sUtc));
+                } else {
+                    d = new Date(iso);
+                }
+                return d.getHours() * 60 + d.getMinutes();
+            };
+
+            const points = stats.map(s => ({
+                x: getMinutes(s.timestamp),
+                y: s.brightness
+            }));
+
+            // Scales
+            const mapX = (minutes) => padding.left + (minutes / 1440) * (width - padding.left - padding.right);
+            const mapY = (val) => height - padding.bottom - (val / 255) * (height - padding.top - padding.bottom);
+
+            // Draw Axes
+            ctx.strokeStyle = '#555';
+            ctx.lineWidth = 1;
+
+            // X-Axis
+            ctx.beginPath();
+            ctx.moveTo(padding.left, height - padding.bottom);
+            ctx.lineTo(width - padding.right, height - padding.bottom);
+            ctx.stroke();
+
+            // Y-Axis
+            ctx.beginPath();
+            ctx.moveTo(padding.left, padding.top);
+            ctx.lineTo(padding.left, height - padding.bottom);
+            ctx.stroke();
+
+            // Draw Line
+            ctx.strokeStyle = '#3b82f6';
+            ctx.lineWidth = 2;
+            ctx.beginPath();
+
+            if (points.length > 0) {
+                ctx.moveTo(mapX(points[0].x), mapY(points[0].y));
+                for (let i = 1; i < points.length; i++) {
+                    ctx.lineTo(mapX(points[i].x), mapY(points[i].y));
+                }
+            }
+            ctx.stroke();
+
+            // Draw Labels (Time)
+            ctx.fillStyle = '#ccc';
+            ctx.font = '12px sans-serif';
+            ctx.textAlign = 'center';
+
+            for (let h = 0; h <= 24; h += 4) {
+                const x = mapX(h * 60);
+                ctx.fillText(`${h}:00`, x, height - 10);
+            }
+
+            // Draw Labels (Brightness)
+            ctx.textAlign = 'right';
+            ctx.textBaseline = 'middle';
+            for (let b = 0; b <= 255; b += 64) {
+                const y = mapY(b);
+                ctx.fillText(Math.round(b), padding.left - 5, y);
             }
         }
 
         function getPrettyTime(ts) {
-            const parts = ts.match(/(\d{2})[-:](\d{2})[-:](\d{2})/);
+            const parts = ts.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2})[-:](\d{2})[-:](\d{2})/);
-            if (parts) return `${parts[1]}:${parts[2]}:${parts[3]}`;
+            if (parts) {
+                const [_, y, m, d, hUtc, mUtc, sUtc] = parts;
+                const date = new Date(Date.UTC(y, m - 1, d, hUtc, mUtc, sUtc));
+                return `${String(date.getHours()).padStart(2, '0')}:${String(date.getMinutes()).padStart(2, '0')}:${String(date.getSeconds()).padStart(2, '0')}`;
+            }
             return ts;
         }
 
@@ -424,6 +550,14 @@
             if (state.selectedDate) loadImages();
         });
 
+        // Auto-update every 60 seconds
+        setInterval(() => {
+            if (state.selectedCamera && state.selectedDate) {
+                // Only auto-update if we are looking at something
+                loadImages(true);
+            }
+        }, 60000);
+
         // Start
         init();
 

server.js

@@ -116,14 +116,43 @@ app.post('/upload', authenticate, upload.single('image'), async (req, res) => {
 
     // Generate thumbnail
     try {
+        const image = sharp(req.file.path);
+        const metadata = await image.metadata(); // Get metadata first
+        const stats = await image.stats(); // Get stats (includes mean for channels)
+
+        // Calculate Average Brightness
+        // Simple average of R, G, B mean values (0-255)
+        const brightness = Math.round((stats.channels[0].mean + stats.channels[1].mean + stats.channels[2].mean) / 3);
+
         const thumbnailFilename = req.file.filename.replace(path.extname(req.file.filename), '_thumb.avif');
         const thumbnailPath = path.join(path.dirname(req.file.path), thumbnailFilename);
+        const dirPath = path.dirname(req.file.path);
 
-        await sharp(req.file.path)
+        await image
             .resize(320) // Resize to 320px width, auto height
             .toFormat('avif')
             .toFile(thumbnailPath);
 
+        // Update daily stats.json
+        const statsFile = path.join(dirPath, 'stats.json');
+        let dailyStats = [];
+        try {
+            if (fs.existsSync(statsFile)) {
+                dailyStats = JSON.parse(fs.readFileSync(statsFile, 'utf8'));
+            }
+        } catch (e) { console.error('Error reading stats.json', e); }
+
+        dailyStats.push({
+            timestamp: new Date().toISOString(),
+            filename: req.file.filename,
+            brightness
+        });
+
+        // Write back stats
+        try {
+            fs.writeFileSync(statsFile, JSON.stringify(dailyStats, null, 2));
+        } catch (e) { console.error('Error writing stats.json', e); }
+
         res.json({
             success: true,
             cameraId,
@@ -132,17 +161,18 @@ app.post('/upload', authenticate, upload.single('image'), async (req, res) => {
             thumbnail: thumbnailFilename,
             thumbnailPath: thumbnailPath,
             size: req.file.size,
+            brightness,
             timestamp: new Date().toISOString()
         });
     } catch (error) {
-        console.error('Thumbnail generation failed:', error);
+        console.error('Processing failed:', error);
-        // Still return success for the upload even if thumbnail fails
+        // Still return success for the upload even if processing fails
         res.json({
             success: true,
             cameraId,
             filename: req.file.filename,
             path: req.file.path,
-            thumbnailError: error.message,
+            error: error.message,
             size: req.file.size,
             timestamp: new Date().toISOString()
         });
@@ -378,7 +408,16 @@ app.get('/cameras/:cameraId/:year/:month/:day', async (req, res) => {
         // Sort by filename (timestamp) descending
         images.sort((a, b) => b.filename.localeCompare(a.filename));
 
-        res.json({ images });
+        // Load stats if available
+        let stats = [];
+        try {
+            const statsFile = path.join(datePath, 'stats.json');
+            if (fs.existsSync(statsFile)) {
+                stats = JSON.parse(fs.readFileSync(statsFile, 'utf8'));
+            }
+        } catch (e) { console.error('Error reading stats.json', e); }
+
+        res.json({ images, stats });
     } catch (error) {
         res.status(500).json({ error: 'Failed to list images', details: error.message });
     }