'use strict';

exports = module.exports = {
    check
};

const backups = require('./backups.js'),
    backupFormats = require('./backupformats.js'),
    backupSites = require('./backupsites.js'),
    BoxError = require('./boxerror'),
    consumers = require('node:stream/consumers'),
    crypto = require('node:crypto');

async function check(backupId, progressCallback) {
    const backup = await backups.get(backupId);
    if (!backup) throw new BoxError(BoxError.BAD_FIELD, 'Backup not found');

    const backupSite = await backupSites.get(backup.siteId);
    if (!backupSite) throw new BoxError(BoxError.BAD_FIELD, 'Backup site not found');

    const stream = await backupSites.storageApi(backupSite).download(backupSite.config, `${backup.remotePath}.backupinfo`);
    const buffer = await consumers.buffer(stream);

    const validSignature = crypto.verify(null /* algo */, buffer, backupSite.integrityKeyPair.publicKey, Buffer.from(backup.integrity.signature, 'utf8'));
    progressCallback({ message: `Signature valid? ${validSignature}`});

    const backupInfo = JSON.parse(buffer.toString('utf8'));
    const integrityMap = new Map(Object.entries(backupInfo));

    const verifyResult = await backupFormats.api(backupSite.format).verify(backupSite, backup.remotePath, integrityMap, progressCallback);
    progressCallback({ message: 'Verification done' });

    return {
        signature: { status: validSignature ? 'passed' : 'failed' },
        ...verifyResult
    };
}