'use strict';

const child_process = require('node:child_process');

function patchMountFile(mountPath, fstype) {
    const mountFilename = child_process.execSync(`systemd-escape -p --suffix=mount "${mountPath}"`, { encoding: 'utf8' }).trim();
    const mountFile = `/etc/systemd/system/${mountFilename}`;

    try {
        child_process.execSync(`sed -i 's/^Type=auto$/Type=${fstype}/' "${mountFile}"`);
        child_process.execSync('systemctl daemon-reload');
        console.log(`Patched ${mountFile}: Type=auto -> Type=${fstype}`);
    } catch (e) {
        console.log(`Warning: failed to patch ${mountFile}: ${e.message}`);
    }
}

exports.up = async function (db) {
    const results = await db.runSql('SELECT id, configJson FROM backupSites WHERE provider = ?', ['disk']);

    for (const row of results) {
        const config = JSON.parse(row.configJson);

        let fstype = 'ext4';
        try {
            const diskPath = config.mountOptions.diskPath;
            const output = child_process.execSync(`lsblk --paths --json --list --fs ${diskPath}`, { encoding: 'utf8' });
            const info = JSON.parse(output);
            if (info.blockdevices[0].fstype === 'xfs') fstype = 'xfs';
        } catch (e) {
            console.log(`Could not detect filesystem type for backup site ${row.id}, defaulting to ext4: ${e.message}`);
        }

        config._provider = fstype;
        console.log(`Migrating backup site ${row.id} from disk to ${fstype}`);
        await db.runSql('UPDATE backupSites SET provider = ?, configJson = ? WHERE id = ?', [fstype, JSON.stringify(config), row.id]);

        if (config._managedMountPath) {
            patchMountFile(config._managedMountPath, fstype);
        }
    }
};

exports.down = function (db, callback) {
    callback();
};