Add Gemini Chat: conversational AI assistant for kitchen help

- Gemini star icon button next to camera in header - Full chat page with message bubbles, typing indicator - Conversation history persisted in localStorage (last 50 messages) - System context includes: full inventory with expiry dates, appliances, dietary restrictions - Multi-turn conversation with Gemini 2.0 Flash - Pre-built suggestion chips: snack, juice/smoothie, light meal, use expiring items - Clear chat button for fresh conversations - Indigo/purple themed UI matching Gemini branding - PHP gemini_chat API endpoint with inventory context injection
2026-03-11 15:26:19 +00:00
parent ff1f27fe8d
commit af3b5941a0
5 changed files with 618 additions and 3 deletions
@@ -95,6 +95,10 @@ try {
            geminiIdentifyProduct();
            break;

+        case 'gemini_chat':
+            geminiChat($db);
+            break;
+
        // ===== BRING! SHOPPING LIST =====
        case 'bring_list':
            bringGetList();
@@ -807,6 +811,167 @@ function geminiReadExpiry(): void {
    ]);
 }

+// ===== GEMINI CHAT =====
+function geminiChat(PDO $db): void {
+    // Load API key
+    $envFile = __DIR__ . '/../.env';
+    $apiKey = '';
+    if (file_exists($envFile)) {
+        $lines = file($envFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+        foreach ($lines as $line) {
+            if (strpos($line, '#') === 0) continue;
+            if (strpos($line, '=') !== false) {
+                list($key, $val) = explode('=', $line, 2);
+                if (trim($key) === 'GEMINI_API_KEY') {
+                    $apiKey = trim($val);
+                }
+            }
+        }
+    }
+
+    if (empty($apiKey)) {
+        echo json_encode(['success' => false, 'error' => 'no_api_key']);
+        return;
+    }
+
+    $input = json_decode(file_get_contents('php://input'), true);
+    $message = $input['message'] ?? '';
+    $history = $input['history'] ?? [];
+    $appliances = $input['appliances'] ?? [];
+    $dietaryRestrictions = $input['dietary_restrictions'] ?? '';
+
+    if (empty($message)) {
+        echo json_encode(['success' => false, 'error' => 'Messaggio vuoto']);
+        return;
+    }
+
+    // Fetch inventory context
+    $stmt = $db->query("
+        SELECT p.name, p.brand, p.category, i.quantity, p.unit, i.location, i.expiry_date,
+               CASE WHEN i.expiry_date IS NOT NULL THEN julianday(i.expiry_date) - julianday('now') ELSE 999 END AS days_left
+        FROM inventory i
+        JOIN products p ON p.id = i.product_id
+        WHERE i.quantity > 0
+        ORDER BY days_left ASC
+    ");
+    $items = $stmt->fetchAll(PDO::FETCH_ASSOC);
+
+    $ingredientLines = [];
+    foreach ($items as $item) {
+        $line = "- {$item['name']}";
+        if ($item['brand']) $line .= " ({$item['brand']})";
+        $line .= ": {$item['quantity']} {$item['unit']}";
+        if ($item['expiry_date']) {
+            $daysLeft = intval($item['days_left']);
+            if ($daysLeft < 0) {
+                $line .= " [SCADUTO da " . abs($daysLeft) . " giorni]";
+            } elseif ($daysLeft <= 3) {
+                $line .= " [SCADE TRA $daysLeft GIORNI]";
+            } elseif ($daysLeft <= 7) {
+                $line .= " [scade tra $daysLeft giorni]";
+            }
+        }
+        $line .= " (in {$item['location']})";
+        $ingredientLines[] = $line;
+    }
+    $ingredientsText = implode("\n", $ingredientLines);
+
+    $appliancesText = '';
+    if (!empty($appliances)) {
+        $appliancesText = "\nElettodomestici disponibili: " . implode(', ', $appliances) . " (più fornelli e forno sempre disponibili).";
+    }
+
+    $dietaryText = '';
+    if (!empty($dietaryRestrictions)) {
+        $dietaryText = "\nRestrizioni alimentari dell'utente: {$dietaryRestrictions}. Rispetta SEMPRE queste restrizioni.";
+    }
+
+    $systemPrompt = <<<PROMPT
+Sei un assistente cucina italiano esperto, amichevole e conciso. L'utente ha una dispensa e ti chiede consigli su cosa preparare.
+
+CONTESTO - INGREDIENTI DISPONIBILI IN DISPENSA:
+{$ingredientsText}
+{$appliancesText}{$dietaryText}
+
+REGOLE:
+1. Rispondi SEMPRE in italiano, in modo colloquiale e amichevole
+2. Usa SOLO gli ingredienti dalla dispensa dell'utente (più acqua, sale, pepe, olio che si presumono sempre disponibili)
+3. Dai priorità agli ingredienti in scadenza
+4. Sii conciso: non fare liste chilometriche, vai al sodo
+5. Se l'utente chiede una ricetta o preparazione, dai istruzioni chiare con quantità
+6. Se non ci sono ingredienti adatti per la richiesta, dillo onestamente e suggerisci alternative
+7. Puoi suggerire combinazioni creative
+8. Quando menzioni quantità, usa le stesse unità di misura della dispensa
+9. Ricorda il contesto della conversazione precedente
+PROMPT;
+
+    // Build conversation for Gemini
+    $contents = [];
+
+    // System instruction as first user+model turn
+    $contents[] = [
+        'role' => 'user',
+        'parts' => [['text' => $systemPrompt]]
+    ];
+    $contents[] = [
+        'role' => 'model',
+        'parts' => [['text' => 'Ciao! Sono il tuo assistente cucina. Conosco tutto quello che hai in dispensa e sono pronto ad aiutarti. Cosa ti va di preparare? 😊']]
+    ];
+
+    // Add conversation history
+    foreach ($history as $msg) {
+        $role = ($msg['role'] === 'user') ? 'user' : 'model';
+        $contents[] = [
+            'role' => $role,
+            'parts' => [['text' => $msg['text']]]
+        ];
+    }
+
+    // Add current message
+    $contents[] = [
+        'role' => 'user',
+        'parts' => [['text' => $message]]
+    ];
+
+    $url = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key={$apiKey}";
+
+    $payload = [
+        'contents' => $contents,
+        'generationConfig' => [
+            'temperature' => 0.8,
+            'maxOutputTokens' => 1500
+        ]
+    ];
+
+    $ch = curl_init($url);
+    curl_setopt_array($ch, [
+        CURLOPT_POST => true,
+        CURLOPT_POSTFIELDS => json_encode($payload),
+        CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
+        CURLOPT_RETURNTRANSFER => true,
+        CURLOPT_TIMEOUT => 60,
+    ]);
+
+    $response = curl_exec($ch);
+    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+    curl_close($ch);
+
+    if ($response === false || $httpCode !== 200) {
+        echo json_encode(['success' => false, 'error' => 'Errore API Gemini', 'http_code' => $httpCode]);
+        return;
+    }
+
+    $data = json_decode($response, true);
+    $reply = $data['candidates'][0]['content']['parts'][0]['text'] ?? '';
+
+    if (empty($reply)) {
+        echo json_encode(['success' => false, 'error' => 'Risposta vuota da Gemini']);
+        return;
+    }
+
+    echo json_encode(['success' => true, 'reply' => $reply]);
+}
+
 // ===== RECIPE GENERATION WITH GEMINI =====
 function generateRecipe(PDO $db): void {
    // Load API key from .env
@@ -113,6 +113,30 @@ body {
    padding-bottom: 2px;
 }

+.header-actions {
+    display: flex;
+    gap: 10px;
+    align-items: center;
+}
+
+.header-gemini-btn {
+    width: 44px;
+    height: 44px;
+    font-size: 1.4rem;
+    animation: none;
+    border-width: 2px;
+    background: rgba(99, 102, 241, 0.35);
+    border-color: rgba(199, 210, 254, 0.6);
+}
+
+.header-gemini-btn:active {
+    background: rgba(99, 102, 241, 0.55);
+}
+
+.gemini-icon {
+    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.2));
+}
+
 .header-scan-btn:active {
    transform: scale(0.9);
    background: rgba(255,255,255,0.4);
@@ -2710,3 +2734,220 @@ body {
    border-radius: 12px;
    white-space: nowrap;
 }
+
+/* ===== GEMINI CHAT ===== */
+.chat-container {
+    display: flex;
+    flex-direction: column;
+    height: calc(100vh - var(--header-height) - var(--nav-height) - 24px);
+    background: var(--bg);
+    border-radius: var(--radius);
+    overflow: hidden;
+}
+
+.chat-header-bar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 10px 14px;
+    background: white;
+    border-bottom: 1px solid var(--border);
+    border-radius: var(--radius) var(--radius) 0 0;
+}
+
+.chat-header-info {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+.chat-title {
+    font-weight: 700;
+    font-size: 1rem;
+    color: #4338ca;
+}
+
+.btn-chat-clear {
+    background: none;
+    border: none;
+    font-size: 1.2rem;
+    cursor: pointer;
+    padding: 4px 8px;
+    border-radius: 8px;
+    opacity: 0.6;
+}
+
+.btn-chat-clear:active {
+    background: var(--bg);
+    opacity: 1;
+}
+
+.chat-messages {
+    flex: 1;
+    overflow-y: auto;
+    padding: 16px 12px;
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    -webkit-overflow-scrolling: touch;
+}
+
+.chat-welcome {
+    text-align: center;
+    padding: 30px 16px;
+    color: var(--text-light);
+}
+
+.chat-welcome h3 {
+    margin: 12px 0 6px;
+    color: var(--text);
+    font-size: 1.1rem;
+}
+
+.chat-welcome p {
+    font-size: 0.85rem;
+    line-height: 1.5;
+    max-width: 300px;
+    margin: 0 auto 20px;
+}
+
+.gemini-icon-lg {
+    opacity: 0.3;
+}
+
+.chat-suggestions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    justify-content: center;
+}
+
+.chat-suggestion {
+    background: white;
+    border: 1.5px solid #e0e7ff;
+    border-radius: 20px;
+    padding: 8px 14px;
+    font-size: 0.82rem;
+    cursor: pointer;
+    color: #4338ca;
+    font-weight: 500;
+    transition: all 0.15s;
+}
+
+.chat-suggestion:active {
+    background: #e0e7ff;
+    transform: scale(0.97);
+}
+
+.chat-bubble {
+    max-width: 85%;
+    padding: 10px 14px;
+    border-radius: 18px;
+    font-size: 0.9rem;
+    line-height: 1.5;
+    word-break: break-word;
+    animation: chatFadeIn 0.2s ease;
+}
+
+@keyframes chatFadeIn {
+    from { opacity: 0; transform: translateY(8px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+.chat-user {
+    align-self: flex-end;
+    background: #4338ca;
+    color: white;
+    border-bottom-right-radius: 6px;
+}
+
+.chat-gemini {
+    align-self: flex-start;
+    background: white;
+    color: var(--text);
+    border-bottom-left-radius: 6px;
+    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
+}
+
+.chat-gemini strong {
+    color: #4338ca;
+}
+
+.chat-gemini ul, .chat-gemini ol {
+    margin: 4px 0;
+    padding-left: 20px;
+}
+
+.chat-gemini li {
+    margin-bottom: 2px;
+}
+
+.chat-input-bar {
+    display: flex;
+    gap: 8px;
+    padding: 10px 12px;
+    background: white;
+    border-top: 1px solid var(--border);
+}
+
+.chat-input {
+    flex: 1;
+    border: 1.5px solid var(--border);
+    border-radius: 24px;
+    padding: 10px 16px;
+    font-size: 0.9rem;
+    outline: none;
+    transition: border-color 0.2s;
+}
+
+.chat-input:focus {
+    border-color: #6366f1;
+}
+
+.btn-chat-send {
+    width: 42px;
+    height: 42px;
+    border-radius: 50%;
+    border: none;
+    background: #4338ca;
+    color: white;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: all 0.15s;
+    flex-shrink: 0;
+}
+
+.btn-chat-send:active {
+    transform: scale(0.92);
+    background: #3730a3;
+}
+
+.btn-chat-send:disabled {
+    background: #a5b4fc;
+    cursor: default;
+}
+
+/* Typing indicator */
+.chat-typing {
+    display: flex;
+    gap: 4px;
+    padding: 4px 0;
+}
+
+.chat-typing span {
+    width: 8px;
+    height: 8px;
+    background: #a5b4fc;
+    border-radius: 50%;
+    animation: chatTyping 1.4s infinite;
+}
+
+.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
+.chat-typing span:nth-child(3) { animation-delay: 0.4s; }
+
+@keyframes chatTyping {
+    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
+    30% { transform: translateY(-6px); opacity: 1; }
+}
@@ -521,6 +521,7 @@ function showPage(pageId, param = null) {
        case 'log': loadLog(); break;
        case 'ai': initAICamera(); break;
        case 'settings': loadSettingsUI(); break;
+        case 'chat': initChat(); break;
    }
    
    // Stop scanner when leaving scan page
@@ -3469,6 +3470,177 @@ async function generateRecipe() {
    }
 }

+// ===== GEMINI CHAT =====
+let chatHistory = [];
+let chatInventoryContext = null;
+
+function initChat() {
+    // Load chat history from localStorage
+    const saved = localStorage.getItem('gemini_chat_history');
+    if (saved) {
+        try {
+            chatHistory = JSON.parse(saved);
+            renderChatHistory();
+        } catch(e) { chatHistory = []; }
+    }
+    // Pre-load inventory context
+    loadChatContext();
+    // Focus input
+    setTimeout(() => {
+        const input = document.getElementById('chat-input');
+        if (input) input.focus();
+    }, 300);
+}
+
+async function loadChatContext() {
+    try {
+        const data = await api('inventory_list');
+        chatInventoryContext = data.inventory || [];
+    } catch(e) { chatInventoryContext = []; }
+}
+
+function sendChatSuggestion(text) {
+    document.getElementById('chat-input').value = text;
+    sendChatMessage();
+}
+
+async function sendChatMessage() {
+    const input = document.getElementById('chat-input');
+    const text = input.value.trim();
+    if (!text) return;
+    
+    input.value = '';
+    
+    // Hide welcome if first message
+    const welcome = document.querySelector('.chat-welcome');
+    if (welcome) welcome.style.display = 'none';
+    
+    // Add user message
+    chatHistory.push({ role: 'user', text });
+    appendChatBubble('user', text);
+    saveChatHistory();
+    
+    // Show typing indicator
+    const typingEl = appendChatBubble('gemini', '<div class="chat-typing"><span></span><span></span><span></span></div>', true);
+    scrollChatBottom();
+    
+    // Disable send
+    const btn = document.getElementById('btn-chat-send');
+    btn.disabled = true;
+    
+    try {
+        const settings = getSettings();
+        const result = await api('gemini_chat', {}, 'POST', {
+            message: text,
+            history: chatHistory.slice(0, -1).slice(-20), // last 20 messages for context
+            appliances: settings.appliances || [],
+            dietary_restrictions: settings.dietary_restrictions || ''
+        });
+        
+        // Remove typing indicator
+        typingEl.remove();
+        
+        if (result.success) {
+            chatHistory.push({ role: 'gemini', text: result.reply });
+            appendChatBubble('gemini', formatChatReply(result.reply));
+        } else {
+            const errMsg = result.error === 'no_api_key' ? 'Configura la chiave API Gemini nelle impostazioni.' : (result.error || 'Errore nella risposta');
+            appendChatBubble('gemini', `⚠️ ${escapeHtml(errMsg)}`);
+        }
+    } catch(err) {
+        typingEl.remove();
+        appendChatBubble('gemini', '⚠️ Errore di connessione');
+    }
+    
+    btn.disabled = false;
+    saveChatHistory();
+    scrollChatBottom();
+}
+
+function appendChatBubble(role, html, isRaw = false) {
+    const container = document.getElementById('chat-messages');
+    const bubble = document.createElement('div');
+    bubble.className = `chat-bubble chat-${role}`;
+    if (isRaw) {
+        bubble.innerHTML = html;
+    } else if (role === 'user') {
+        bubble.textContent = html;
+    } else {
+        bubble.innerHTML = html;
+    }
+    container.appendChild(bubble);
+    scrollChatBottom();
+    return bubble;
+}
+
+function formatChatReply(text) {
+    // Convert markdown-like formatting
+    let html = escapeHtml(text);
+    // Bold **text**
+    html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
+    // Italic *text*
+    html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
+    // Lists
+    html = html.replace(/^- (.+)$/gm, '<li>$1</li>');
+    html = html.replace(/(<li>.*<\/li>)/s, '<ul>$1</ul>');
+    // Numbered lists  
+    html = html.replace(/^(\d+)\. (.+)$/gm, '<li>$2</li>');
+    // Line breaks
+    html = html.replace(/\n/g, '<br>');
+    // Clean up consecutive ul tags
+    html = html.replace(/<\/ul>\s*<br>\s*<ul>/g, '');
+    return html;
+}
+
+function renderChatHistory() {
+    const container = document.getElementById('chat-messages');
+    if (chatHistory.length === 0) return;
+    
+    // Hide welcome
+    const welcome = container.querySelector('.chat-welcome');
+    if (welcome) welcome.style.display = 'none';
+    
+    chatHistory.forEach(msg => {
+        if (msg.role === 'user') {
+            appendChatBubble('user', msg.text);
+        } else {
+            appendChatBubble('gemini', formatChatReply(msg.text));
+        }
+    });
+    scrollChatBottom();
+}
+
+function scrollChatBottom() {
+    const container = document.getElementById('chat-messages');
+    setTimeout(() => container.scrollTop = container.scrollHeight, 50);
+}
+
+function clearChat() {
+    chatHistory = [];
+    localStorage.removeItem('gemini_chat_history');
+    const container = document.getElementById('chat-messages');
+    container.innerHTML = `
+        <div class="chat-welcome">
+            <svg class="gemini-icon-lg" viewBox="0 0 24 24" width="48" height="48" fill="#6366f1"><path d="M12 0C12 6.627 6.627 12 0 12c6.627 0 12 5.373 12 12 0-6.627 5.373-12 12-12-6.627 0-12-5.373-12-12z"/></svg>
+            <h3>Ciao! Sono il tuo assistente cucina</h3>
+            <p>Chiedimi di prepararti un succo, uno spuntino, un piatto veloce... Conosco la tua dispensa, i tuoi elettrodomestici e le tue preferenze!</p>
+            <div class="chat-suggestions">
+                <button class="chat-suggestion" onclick="sendChatSuggestion('Cosa posso preparare per uno spuntino veloce?')">🍿 Spuntino veloce</button>
+                <button class="chat-suggestion" onclick="sendChatSuggestion('Fammi un succo o frullato con quello che ho')">🥤 Succo/Frullato</button>
+                <button class="chat-suggestion" onclick="sendChatSuggestion('Ho fame ma voglio qualcosa di leggero')">🥗 Qualcosa di leggero</button>
+                <button class="chat-suggestion" onclick="sendChatSuggestion('Cosa sta per scadere e come posso usarlo?')">⏰ Usa le scadenze</button>
+            </div>
+        </div>
+    `;
+    showToast('Chat cancellata', 'success');
+}
+
+function saveChatHistory() {
+    // Keep last 50 messages max
+    if (chatHistory.length > 50) chatHistory = chatHistory.slice(-50);
+    localStorage.setItem('gemini_chat_history', JSON.stringify(chatHistory));
+}
+
 // ===== INITIALIZATION =====
 document.addEventListener('DOMContentLoaded', () => {
    showPage('dashboard');
@@ -19,9 +19,14 @@
 <header class="app-header">
    <div class="header-content">
        <h1 class="header-title" onclick="showPage('dashboard')">🏠 Dispensa</h1>
-        <button class="header-scan-btn" onclick="showPage('scan')" title="Scansiona prodotto">
-            📷
-        </button>
+        <div class="header-actions">
+            <button class="header-scan-btn header-gemini-btn" onclick="showPage('chat')" title="Chat con Gemini">
+                <svg class="gemini-icon" viewBox="0 0 24 24" width="28" height="28" fill="white"><path d="M12 0C12 6.627 6.627 12 0 12c6.627 0 12 5.373 12 12 0-6.627 5.373-12 12-12-6.627 0-12-5.373-12-12z"/></svg>
+            </button>
+            <button class="header-scan-btn" onclick="showPage('scan')" title="Scansiona prodotto">
+                📷
+            </button>
+        </div>
    </div>
 </header>

@@ -597,6 +602,38 @@
        <div id="settings-status" class="settings-status" style="display:none"></div>
    </section>

+    <!-- ===== GEMINI CHAT ===== -->
+    <section class="page" id="page-chat">
+        <div class="chat-container">
+            <div class="chat-header-bar">
+                <div class="chat-header-info">
+                    <svg class="gemini-icon-sm" viewBox="0 0 24 24" width="22" height="22" fill="#6366f1"><path d="M12 0C12 6.627 6.627 12 0 12c6.627 0 12 5.373 12 12 0-6.627 5.373-12 12-12-6.627 0-12-5.373-12-12z"/></svg>
+                    <span class="chat-title">Gemini Chef</span>
+                </div>
+                <button class="btn-chat-clear" onclick="clearChat()" title="Nuova conversazione">🗑️</button>
+            </div>
+            <div class="chat-messages" id="chat-messages">
+                <div class="chat-welcome">
+                    <svg class="gemini-icon-lg" viewBox="0 0 24 24" width="48" height="48" fill="#6366f1"><path d="M12 0C12 6.627 6.627 12 0 12c6.627 0 12 5.373 12 12 0-6.627 5.373-12 12-12-6.627 0-12-5.373-12-12z"/></svg>
+                    <h3>Ciao! Sono il tuo assistente cucina</h3>
+                    <p>Chiedimi di prepararti un succo, uno spuntino, un piatto veloce... Conosco la tua dispensa, i tuoi elettrodomestici e le tue preferenze!</p>
+                    <div class="chat-suggestions">
+                        <button class="chat-suggestion" onclick="sendChatSuggestion('Cosa posso preparare per uno spuntino veloce?')">🍿 Spuntino veloce</button>
+                        <button class="chat-suggestion" onclick="sendChatSuggestion('Fammi un succo o frullato con quello che ho')">🥤 Succo/Frullato</button>
+                        <button class="chat-suggestion" onclick="sendChatSuggestion('Ho fame ma voglio qualcosa di leggero')">🥗 Qualcosa di leggero</button>
+                        <button class="chat-suggestion" onclick="sendChatSuggestion('Cosa sta per scadere e come posso usarlo?')">⏰ Usa le scadenze</button>
+                    </div>
+                </div>
+            </div>
+            <div class="chat-input-bar">
+                <input type="text" id="chat-input" class="chat-input" placeholder="Chiedi qualcosa..." onkeydown="if(event.key==='Enter')sendChatMessage()">
+                <button class="btn-chat-send" id="btn-chat-send" onclick="sendChatMessage()">
+                    <svg viewBox="0 0 24 24" width="22" height="22" fill="white"><path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/></svg>
+                </button>
+            </div>
+        </div>
+    </section>
+
 </main>

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