backend/services/ai/bookRecap.js

import { BOOK_RECAP_PROMPT } from '../../../prompts/bookRecap.js';

import { tryModels, getPrompt, DEFAULT_SAFETY_SETTINGS } from '@/backend/services/ai/utils';

export async function bookRecap(media, mimeType, targetLanguage, apiKey, isOwnApi = false) {
    const models = ['gemini-3-flash-preview', 'gemini-flash-lite-latest'];
    const isBurmese = targetLanguage.toLowerCase().includes('burm') || targetLanguage.includes('မြန်မာ');
    
    // Clean language name in case any legacy strings remain
    const cleanLanguage = targetLanguage.split(' (')[0];
    
    const finalPrompt = BOOK_RECAP_PROMPT(targetLanguage);

    return await tryModels(apiKey, models, async (ai, model) => {
        const response = await ai.models.generateContent({
            model: model,
            contents: { 
                parts: [
                    { inlineData: { data: media, mimeType } }, 
                    { text: `Translate this entire document COMPLETELY (100% length) into ${cleanLanguage}. Do not summarize or skip any content.` }
                ] 
            },
            config: { 
                temperature: 0.3, 
                systemInstruction: finalPrompt, 
                safetySettings: DEFAULT_SAFETY_SETTINGS,
                thinkingConfig: { thinkingBudget: 0 }
            }
        });
        
        const text = response.text;
        if (!text || text.trim().length < 50) {
             throw new Error("MODEL_FAILED_TO_TRANSLATE_DOCUMENT");
        }
        return text;
    });
}