'use strict';

exports = module.exports = {
    start,
    rebuild,

    DEFAULT_MEMORY_LIMIT: 256 * 1024 * 1024
};

const apps = require('./apps.js'),
    assert = require('assert'),
    async = require('async'),
    BoxError = require('./boxerror.js'),
    debug = require('debug')('box:sftp'),
    hat = require('./hat.js'),
    infra = require('./infra_version.js'),
    paths = require('./paths.js'),
    safe = require('safetydance'),
    shell = require('./shell.js'),
    system = require('./system.js'),
    volumes = require('./volumes.js');

function rebuild(serviceConfig, options, callback) {
    assert.strictEqual(typeof serviceConfig, 'object');
    assert.strictEqual(typeof options, 'object');
    assert.strictEqual(typeof callback, 'function');

    debug('rebuilding container');

    const tag = infra.images.sftp.tag;
    const memoryLimit = serviceConfig.memoryLimit || exports.DEFAULT_MEMORY_LIMIT;
    const memory = system.getMemoryAllocation(memoryLimit);
    const cloudronToken = hat(8 * 128);

    let dataDirs = [];

    const stat = safe.fs.lstatSync(paths.APPS_DATA_DIR);
    if (!stat) return callback(new BoxError(BoxError.FS_ERROR, safe.error));

    const resolvedAppDataDir = stat.isSymbolicLink() ? safe.fs.readlinkSync(paths.APPS_DATA_DIR) : paths.APPS_DATA_DIR;

    dataDirs.push({ hostDir: resolvedAppDataDir, mountDir: '/mnt/appsdata' });

    apps.getAll(async function (error, result) {
        if (error) return callback(error);

        result.forEach(function (app) {
            if (!app.manifest.addons['localstorage'] || !app.dataDir) return;

            const hostDir = apps.getDataDir(app, app.dataDir), mountDir = `/mnt/${app.id}`;
            if (!safe.fs.existsSync(hostDir)) { // this can fail if external mount does not have permissions for yellowtent user
                // do not create host path when cloudron is restoring. this will then create dir with root perms making restore logic fail
                debug(`Ignoring app data dir ${hostDir} for ${app.id} since it does not exist`);
                return;
            }

            dataDirs.push({ hostDir, mountDir });
        });

        let allVolumes;
        [error, allVolumes] = await safe(volumes.list());
        if (error) return callback(error);

        dataDirs.push({ hostDir: '/mnt/volumes', mountDir: '/mnt/volumes' });

        allVolumes.forEach(function (volume) {
            if (volume.hostPath.startsWith('/mnt/volumes/')) return;

            if (!safe.fs.existsSync(volume.hostPath)) {
                debug(`Ignoring volume host path ${volume.hostPath} since it does not exist`);
                return;
            }

            dataDirs.push({ hostDir: volume.hostPath, mountDir: `/mnt/${volume.id}` });
        });

        const mounts = dataDirs.map(function (v) { return `-v "${v.hostDir}:${v.mountDir}"`; }).join(' ');
        const cmd = `docker run --restart=always -d --name="sftp" \
                    --hostname sftp \
                    --net cloudron \
                    --net-alias sftp \
                    --log-driver syslog \
                    --log-opt syslog-address=udp://127.0.0.1:2514 \
                    --log-opt syslog-format=rfc5424 \
                    --log-opt tag=sftp \
                    -m ${memory} \
                    --memory-swap ${memoryLimit} \
                    --dns 172.18.0.1 \
                    --dns-search=. \
                    -p 222:22 \
                    ${mounts} \
                    -e CLOUDRON_SFTP_TOKEN="${cloudronToken}" \
                    -v "${paths.SFTP_KEYS_DIR}:/etc/ssh:ro" \
                    --label isCloudronManaged=true \
                    --read-only -v /tmp -v /run "${tag}"`;

        // ignore error if container not found (and fail later) so that this code works across restarts
        async.series([
            shell.exec.bind(null, 'stopSftp', 'docker stop sftp || true'),
            shell.exec.bind(null, 'removeSftp', 'docker rm -f sftp || true'),
            shell.exec.bind(null, 'startSftp', cmd)
        ], callback);
    });
}

function start(existingInfra, serviceConfig, callback) {
    assert.strictEqual(typeof existingInfra, 'object');
    assert.strictEqual(typeof serviceConfig, 'object');
    assert.strictEqual(typeof callback, 'function');

    rebuild(serviceConfig, { force: true }, callback); // force rebuild when infra changed
}