const fs = require('fs');
const https = require('https');

async function extractTextFromImage(imageBuffer) {
    console.log('[DEBUG] extractTextFromImage: Starting image text extraction');
    console.log('[DEBUG] Image buffer size:', imageBuffer.length, 'bytes');
    
    return new Promise((resolve, reject) => {
        const base64Image = imageBuffer.toString('base64');
        console.log('[DEBUG] Base64 image length:', base64Image.length);

        const requestData = JSON.stringify({
            "contents": [
                {
                    "parts": [
                        {
                            "inline_data": {
                                "mime_type": "image/png",
                                "data": base64Image
                            }
                        },
                        {
                            "text": "Berikan text yang ada di gambar ini saja, tidak ada informasi lain cukup yang ada di gambar saja, jangan ada text lain kalo bukan dari gambar nya."
                        }
                    ]
                }
            ]
        });

        console.log('[DEBUG] Request data prepared, length:', requestData.length);

        const options = {
            hostname: 'generativelanguage.googleapis.com',
            path: '/v1beta/models/gemini-2.5-flash-lite:generateContent',
            method: 'POST',
            headers: {
                'x-goog-api-key': 'AIzaSyB3-2egs0udKCDX_F7I58uVRAwv7OUX1G8',
                'Content-Type': 'application/json',
                'Content-Length': Buffer.byteLength(requestData)
            }
        };

        console.log('[DEBUG] Making request to Gemini API...');

        const req = https.request(options, (res) => {
            console.log('[DEBUG] API Response status:', res.statusCode);
            console.log('[DEBUG] API Response headers:', res.headers);

            let data = '';

            res.on('data', (chunk) => {
                data += chunk;
            });

            res.on('end', () => {
                console.log('[DEBUG] Received all response data');
                console.log('[DEBUG] Response data length:', data.length);
                
                try {
                    const response = JSON.parse(data);
                    console.log('[DEBUG] Response parsed successfully');
                    
                    if (response.candidates && response.candidates[0] && response.candidates[0].content) {
                        const text = response.candidates[0].content.parts[0].text;
                        console.log('[DEBUG] ✅ Text extracted:', text);
                        resolve({ status: true, response: text });
                    } else {
                        console.log('[DEBUG] ❌ No text found in response');
                        console.log('[DEBUG] Response structure:', JSON.stringify(response, null, 2));
                        
                        if (response.error) {
                            console.log('[DEBUG] API Error:', response.error);
                        }
                        
                        resolve({ status: false, response: 'Tidak ada teks yang ditemukan' });
                    }
                } catch (error) {
                    console.error('[DEBUG] ❌ JSON parse error:', error);
                    console.log('[DEBUG] Raw response data:', data);
                    reject(error);
                }
            });
        });

        req.on('error', (error) => {
            console.error('[DEBUG] ❌ Request error:', error);
            reject(error);
        });

        req.on('timeout', () => {
            console.error('[DEBUG] ❌ Request timeout');
            req.destroy();
            reject(new Error('Request timeout'));
        });

        req.setTimeout(30000); // 30 second timeout

        console.log('[DEBUG] Sending request...');
        req.write(requestData);
        req.end();
        console.log('[DEBUG] Request sent');
    });
}

module.exports = { extractTextFromImage };