const sequential = require('promise-sequential');
const { default: DriveFile, deleteDriveFile } = require('../built/models/drive-file');
const { default: Note } = require('../built/models/note');
const { default: MessagingMessage } = require('../built/models/messaging-message');
const { default: User } = require('../built/models/user');

async function main() {
	const promiseGens = [];

	const count = await DriveFile.count({});

	let prev;

	for (let i = 0; i < count; i++) {
		promiseGens.push(() => new Promise(async (res, rej) => {
			const file = await DriveFile.findOne(prev ? {
				_id: { $gt: prev._id }
			} : {}, {
				sort: {
					_id: 1
				}
			});

			prev = file;

			console.log(`scanning ${file._id}`);

			const attachingUsersCount = await User.count({
				$or: [{
					avatarId: file._id
				}, {
					bannerId: file._id
				}]
			}, { limit: 1 });
			if (attachingUsersCount !== 0) return res();

			const attachingNotesCount = await Note.count({
				mediaIds: file._id
			}, { limit: 1 });
			if (attachingNotesCount !== 0) return res();

			const attachingMessagesCount = await MessagingMessage.count({
				fileId: file._id
			}, { limit: 1 });
			if (attachingMessagesCount !== 0) return res();

			console.log(`deleting ${file._id}`);

			deleteDriveFile(file).then(res).catch(rej);
		}));
	}

	return await sequential(promiseGens);
}

main().then(console.dir).catch(console.error);