const sharp = require('sharp');
const axios = require('axios');
const fs = require('fs').promises;
const path = require('path');

async function downloadImage(url, destination) {
    try {
        const response = await axios({
            url,
            method: 'GET',
            responseType: 'arraybuffer',
        });
        await fs.writeFile(destination, response.data);
    } catch (error) {
        console.error(`Erreur lors du téléchargement de l'image ${url}:`, error);
        throw error;
    }
}

async function generateImage(imageUrls, outputPath) {
    const tempDir = path.join(__dirname, 'temp');
    await fs.mkdir(tempDir, {recursive: true});

    const images = [];

    for (const imageUrl of imageUrls) {
        try {
            const tempPath = path.join(tempDir, `${Date.now()}-${Math.random().toString(36).substr(2, 9)}.jpg`);
            await downloadImage(imageUrl, tempPath);
            images.push(sharp(tempPath));
        } catch (error) {
            console.error(`Impossible de télécharger l'image ${imageUrl}. Elle sera ignorée.`);
        }
    }

    if (images.length === 0) {
        throw new Error("Aucune image n'a pu être téléchargée.");
    }

    const firstImage = await images[0].metadata();
    const width = firstImage.width;
    const height = firstImage.height;

    const composite = sharp({
        create: {
            width: width * images.length,
            height,
            channels: 4,
            background: {r: 255, g: 255, b: 255, alpha: 1}
        }
    });

    const compositeOperations = await Promise.all(images.map(async (image, index) => ({
        input: await image.toBuffer(),
        top: 0,
        left: width * index
    })));

    await composite.composite(compositeOperations).toFile(outputPath);

    // Supprimer les images temporaires
    for (const image of images) {
        image.destroy();
    }

    const files = await fs.readdir(tempDir);
    for (const file of files) {
        await fs.unlink(path.join(tempDir, file));
    }
}

// Exemple d'utilisation
const imageUrls = [
    'https://mastodon.cipherbliss.com/system/cache/accounts/avatars/000/012/606/original/37deaa900b17861d.png',
    'https://mastodon.cipherbliss.com/system/cache/accounts/avatars/000/012/606/original/37deaa900b17861d.png',
    'https://mastodon.cipherbliss.com/system/cache/accounts/avatars/000/012/606/original/37deaa900b17861d.png',
];

const outputPath = path.join(__dirname, 'documents', 'generated_pictures', 'combined_images.jpg');

generateImage(imageUrls, outputPath)
    .then(() => console.log('Image générée avec succès!'))
    .catch((err) => console.error('Erreur lors de la génération de l\'image:', err));