const fs = require('fs/promises');
const thumbs = require('./thumbs.js');

const dir  = process.argv[2];
const dest = process.argv[3];

fs.readdir(dir)
.then(async files => {
	const list = [];
	for (const file of files) {
		const regex = /\.json/;
		if (file.match(regex)) {
			const data = await fs.readFile(`${dir}/${file}`);
			const json = JSON.parse(data);
			list.push(json);
		}
	}
	return list;
})
.then(list => {
	posts = {}
	for (const element of list) {
		const media = { 
			type:   element.typename,
			file:  `${element.media_id}.${element.extension}`,
			height: element.height,
			width:  element.width
		};

		if (element.post_id in posts) {
			posts[element.post_id].media.push(media);
		} else {
			const newelem = {
				date:        element.date,
				description: element.description,
				likes:       element.likes,
				post:        element.post_id,
				media: [
					media
				]
			};

			if (element.tags)
				newelem.tags = element.tags;
			if (element.tagged_users)
				newelem.users = element.tagged_users;

			posts[element.post_id] = newelem;
		}
	}
	return posts;
})
.then(async posts => {
	const promises = Object.values(posts).map(async elem => 
		fs.mkdir(`${dest}/${elem.post}`, { recursive: true })
		.then(async () => {
			for (const media of elem.media) {
				let filename;
				if (elem.media.length > 1) {
					filename = `${dir}/${elem.post}_${media.file}`
				} else {
					filename = `${dir}/${media.file}`;
				}
				await fs.copyFile(filename, `${dest}/${elem.post}/${media.file}`);
				thumbs.dothumb(`${dest}/${elem.post}`).then(() => console.log(`${elem.post} miniatura creada`));
			}
		})
		.catch(console.error)
	);
	await Promise.all(promises);
	return posts;
})
	.then(posts => {
		fs.writeFile(`${dest}/list.json`, JSON.stringify(posts, null, 4));

	})
	.catch(console.error);