Fix AI banner: add Uz-En fallback dictionary, fix Gemini model name, add logging

bot/bot.js

@@ -34,14 +34,49 @@ function downloadImage(url) {
     });
 }
 
+// O'zbekcha-Inglizcha sodda lug'at (Gemini ishlamasa fallback)
+const uzToEn = {
+    'kiyim': 'clothing', 'kiyimlar': 'clothes', 'moda': 'fashion', 'ayol': 'woman', 'erkak': 'man',
+    'go\'zal': 'beautiful', 'chiroyli': 'beautiful', 'zamonaviy': 'modern', 'yangi': 'new',
+    'chegirma': 'sale discount', 'skidka': 'sale discount', 'aksiya': 'promotion sale',
+    'arzon': 'affordable price', 'narx': 'price',
+    'yozgi': 'summer', 'qishki': 'winter', 'bahorgi': 'spring', 'kuzgi': 'autumn',
+    'kolleksiya': 'collection', 'sport': 'sports athletic', 'sportiv': 'sports athletic',
+    'athietivk': 'athletic sportswear', 'atletik': 'athletic sportswear',
+    'texnika': 'technology gadgets', 'gadjet': 'gadgets devices', 'telefon': 'smartphone phone',
+    'kompyuter': 'computer laptop', 'audio': 'audio headphones',
+    'sovga': 'gift present', 'bayram': 'holiday celebration', 'tovar': 'product', 'tavaar': 'product',
+    'tovarlar': 'products', 'tavaarlar': 'products', 'barch': 'all', 'barcha': 'all',
+    'reklama': 'advertisement', 'banner': 'promotional banner', 'dizayn': 'design',
+    'dizayinda': 'in design style', 'premium': 'premium luxury', 'klassik': 'classic elegant',
+    'rangli': 'colorful', 'qora': 'black', 'oq': 'white', 'qizil': 'red', 'ko\'k': 'blue',
+    'yashil': 'green', 'sariq': 'yellow', 'pushti': 'pink',
+    'kurtka': 'jacket', 'kostyum': 'suit', 'kastiyum': 'suit', 'ko\'ylak': 'shirt dress',
+    'shim': 'pants trousers', 'futbolka': 't-shirt', 'palto': 'coat overcoat',
+    'tufli': 'shoes', 'krossovka': 'sneakers', 'sumka': 'bag handbag',
+    'bolalar': 'children kids', 'bola': 'child kid', 'oila': 'family',
+    'do\'kon': 'store shop', 'magazin': 'store shop', 'savdo': 'commerce shopping',
+    'yasa': '', 'yoq': '', 'deb': '', 'yozilgan': 'with text overlay',
+    'mantiya': 'graduation gown mantle', 'manti': 'graduation gown coat',
+};
+
+function translateUzToEn(text) {
+    let result = text.toLowerCase();
+    // Har bir so'zni tarjima qilish
+    for (const [uz, en] of Object.entries(uzToEn)) {
+        result = result.replace(new RegExp(uz.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), 'gi'), en);
+    }
+    // Raqamlarni saqlab qolish (masalan: 30%)
+    return result.trim();
+}
+
 // AI yordamida (Gemini) promptni professional kengaytirish
 async function enhancePromptWithGemini(userText, templateBase = '') {
-    if (!process.env.GEMINI_API_KEY) {
-        return (templateBase ? templateBase + ', ' : '') + userText + ', photorealistic, detailed';
-    }
-    try {
-        const model = genAI.getGenerativeModel({ model: "gemini-2.5-flash" });
-        const prompt = `You are an expert AI image prompt engineer for an e-commerce platform.
+    // Avval Gemini bilan urinib ko'rish
+    if (process.env.GEMINI_API_KEY) {
+        try {
+            const model = genAI.getGenerativeModel({ model: "gemini-2.0-flash" });
+            const prompt = `You are an expert AI image prompt engineer for an e-commerce platform.
 The user wants to generate a banner image, but they write in Uzbek and might have typos.
 CRITICAL RULE: Interpret words in FASHION, CLOTHING, TECH, or E-COMMERCE contexts. E.g., if they write "manti", "mantiani", or "mantiya", they mean "graduation gown", "coat", or "mantle" (clothing), NEVER the food (dumplings).
 
@@ -54,12 +89,24 @@ Template Context: ${templateBase || 'None'}
 User's Idea: "${userText}"
 
 Respond ONLY with the final English prompt string, and nothing else.`;
-        const result = await model.generateContent(prompt);
-        return result.response.text().trim();
-    } catch (e) {
-        console.error("Gemini error:", e);
-        return userText + ', photorealistic, no text';
+            const result = await model.generateContent(prompt);
+            const enhanced = result.response.text().trim();
+            console.log('[AI BANNER] Gemini enhanced:', enhanced);
+            return enhanced;
+        } catch (e) {
+            console.error("[AI BANNER] Gemini FAILED:", e.message);
+            // Gemini xato qilsa — fallback'ga tushadi (pastga)
+        }
+    } else {
+        console.warn("[AI BANNER] GEMINI_API_KEY not found, using dictionary fallback");
     }
+    
+    // FALLBACK: Gemini ishlamasa, oddiy lug'at orqali tarjima
+    const translated = translateUzToEn(userText);
+    const base = templateBase ? templateBase + ', ' : '';
+    const fallback = `${base}${translated}, professional product photography, photorealistic, cinematic lighting, highly detailed`;
+    console.log('[AI BANNER] Fallback prompt:', fallback);
+    return fallback;
 }
 
 // AI Banner Shablon Promptlari