import fs from 'fs';
import path from 'path';
import { promisify } from 'util';

import { resizeImages } from '../ssg_hooks/resizeImages.js'

export async function cacheImages() {
    const sourceFolder = './.output/public/api/assets';      
    const destinationFolder = './public/api/assets';

    if (!fs.existsSync(destinationFolder)) fs.mkdirSync(destinationFolder, { recursive: true });

    const readdir = promisify(fs.readdir);
    const stat = promisify(fs.stat);
    const copyFile = promisify(fs.copyFile);

    async function directoryExists(directoryPath) {
        try {
            const stats = await fs.promises.stat(directoryPath);
            return stats.isDirectory();
        } catch (error) {
            if (error.code === 'ENOENT') {
                return false;
            } else {
                throw error;
            }
        }
    }

    async function copyFilesIfNotExist(sourceFolder, destinationFolder) {
        try {
            const exists = await directoryExists(sourceFolder);
            if (!exists) {
                console.log(`Source folder '${sourceFolder}' does not exist.`);
                return;
            }
            
            const files = await readdir(sourceFolder);
            for (const file of files) {
                const sourceFilePath = path.join(sourceFolder, file);
                const destinationFilePath = path.join(destinationFolder, file);
                const sourceFileStat = await stat(sourceFilePath);

                if (sourceFileStat.isFile()) {
                    try {
                        await stat(destinationFilePath);
                    } catch (error) {
                        if (error.code === 'ENOENT') {
                            await copyFile(sourceFilePath, destinationFilePath);
                            console.log(`Copied '${file}' to '${destinationFolder}'.`);
                        } else {
                            throw error;
                        }
                    }
                }
            }
            console.log('Files copied successfully.');

            console.log('Start images resizing.');
             
            const imageSizes = [
                { small: 750 },
                { large: 1920 },
            ];

            await resizeImages(imageSizes);
            
        } catch (error) {
            console.error('Error:', error);
        }
    }

    copyFilesIfNotExist(sourceFolder, destinationFolder);
}