'use strict';

exports = module.exports = {
    initialize,
    uninitialize,

    getStatus,
    getConfig,

    onActivated,

    setupDnsAndCert,

    prepareDashboardDomain,
    setDashboardDomain,
    updateDashboardDomain,

    getTimeZone,
    setTimeZone,

    getLanguage,
    setLanguage,
};

const apps = require('./apps.js'),
    appstore = require('./appstore.js'),
    assert = require('assert'),
    AuditSource = require('./auditsource.js'),
    BoxError = require('./boxerror.js'),
    branding = require('./branding.js'),
    constants = require('./constants.js'),
    cron = require('./cron.js'),
    debug = require('debug')('box:cloudron'),
    dns = require('./dns.js'),
    dockerProxy = require('./dockerproxy.js'),
    eventlog = require('./eventlog.js'),
    mailServer = require('./mailserver.js'),
    moment = require('moment-timezone'),
    network = require('./network.js'),
    oidc = require('./oidc.js'),
    paths = require('./paths.js'),
    platform = require('./platform.js'),
    reverseProxy = require('./reverseproxy.js'),
    safe = require('safetydance'),
    services = require('./services.js'),
    settings = require('./settings.js'),
    tasks = require('./tasks.js'),
    timers = require('timers/promises'),
    translation = require('./translation.js'),
    users = require('./users.js');

async function initialize() {
    safe(runStartupTasks(), { debug }); // background

    await notifyUpdate();
}

async function uninitialize() {
    await cron.stopJobs();
    await dockerProxy.stop();
    await platform.stopAllTasks();
}

async function onActivated(options) {
    assert.strictEqual(typeof options, 'object');

    debug('onActivated: running post activation tasks');

    // Starting the platform after a user is available means:
    // 1. mail bounces can now be sent to the cloudron owner
    // 2. the restore code path can run without sudo (since mail/ is non-root)
    await platform.start(options);
    await cron.startJobs();
    await dockerProxy.start(); // this relies on the 'cloudron' docker network interface to be available
    await oidc.start(); // this requires dashboardFqdn to be set

    // disable responding to api calls via IP to not leak domain info. this is carefully placed as the last item, so it buys
    // the UI some time to query the dashboard domain in the restore code path
    await timers.setTimeout(30000);
    await reverseProxy.writeDefaultConfig({ activated :true });
}

async function notifyUpdate() {
    const version = safe.fs.readFileSync(paths.VERSION_FILE, 'utf8');
    if (version === constants.VERSION) return;

    if (!version) {
        await eventlog.add(eventlog.ACTION_INSTALL_FINISH, AuditSource.CRON, { version: constants.VERSION });
    } else {
        await eventlog.add(eventlog.ACTION_UPDATE_FINISH, AuditSource.CRON, { errorMessage: '', oldVersion: version || 'dev', newVersion: constants.VERSION });
        const [error] = await safe(tasks.setCompletedByType(tasks.TASK_UPDATE, { error: null }));
        if (error && error.reason !== BoxError.NOT_FOUND) throw error; // when hotfixing, task may not exist
    }

    safe.fs.writeFileSync(paths.VERSION_FILE, constants.VERSION, 'utf8');
}

// each of these tasks can fail. we will add some routes to fix/re-run them
async function runStartupTasks() {
    const tasks = [];

    // stop all the systemd tasks
    tasks.push(platform.stopAllTasks);

    // always generate webadmin config since we have no versioning mechanism for the ejs
    tasks.push(async function () {
        if (!settings.dashboardDomain()) return;

        await reverseProxy.writeDashboardConfig(settings.dashboardDomain());
    });

    tasks.push(async function () {
        // check activation state and start the platform
        const activated = await users.isActivated();

        // configure nginx to be reachable by IP when not activated. for the moment, the IP based redirect exists even after domain is setup
        // just in case user forgot or some network error happenned in the middle (then browser refresh takes you to activation page)
        // we remove the config as a simple security measure to not expose IP <-> domain
        if (!activated) {
            debug('runStartupTasks: not activated. generating IP based redirection config');
            return await reverseProxy.writeDefaultConfig({ activated: false });
        }

        await onActivated({});
    });

    // we used to run tasks in parallel but simultaneous nginx reloads was causing issues
    for (let i = 0; i < tasks.length; i++) {
        const [error] = await safe(tasks[i]());
        if (error) debug(`Startup task at index ${i} failed: ${error.message} ${error.stack}`);
    }
}

async function getStatus() {
    return {
        version: constants.VERSION,
    };
}

async function getConfig() {
    const release = safe.fs.readFileSync('/etc/lsb-release', 'utf-8');
    if (release === null) throw new BoxError(BoxError.FS_ERROR, safe.error.message);
    const ubuntuVersion = release.match(/DISTRIB_DESCRIPTION="(.*)"/)[1];
    const profileConfig = await users.getProfileConfig();

    // be picky about what we send out here since this is sent for 'normal' users as well
    return {
        apiServerOrigin: await appstore.getApiServerOrigin(),
        webServerOrigin: await appstore.getWebServerOrigin(),
        consoleServerOrigin: await appstore.getConsoleServerOrigin(),
        adminDomain: settings.dashboardDomain(),
        adminFqdn: settings.dashboardFqdn(),
        mailFqdn: await mailServer.getLocation().fqdn,
        version: constants.VERSION,
        ubuntuVersion,
        isDemo: constants.DEMO,
        cloudronName: await branding.getCloudronName(),
        footer: await branding.renderFooter(),
        features: appstore.getFeatures(),
        profileLocked: profileConfig.lockUserProfiles,
        mandatory2FA: profileConfig.mandatory2FA,
    };
}

async function prepareDashboardDomain(domain, auditSource) {
    assert.strictEqual(typeof domain, 'string');
    assert.strictEqual(typeof auditSource, 'object');

    debug(`prepareDashboardDomain: ${domain}`);

    if (constants.DEMO) throw new BoxError(BoxError.CONFLICT, 'Not allowed in demo mode');

    const fqdn = dns.fqdn(constants.DASHBOARD_SUBDOMAIN, domain);

    const result = await apps.list();
    if (result.some(app => app.fqdn === fqdn)) throw new BoxError(BoxError.BAD_STATE, 'Dashboard location conflicts with an existing app');

    const taskId = await tasks.add(tasks.TASK_SETUP_DNS_AND_CERT, [ constants.DASHBOARD_SUBDOMAIN, domain, auditSource ]);

    tasks.startTask(taskId, {});

    return taskId;
}

// call this only pre activation since it won't start mail server
async function setDashboardDomain(domain, auditSource) {
    assert.strictEqual(typeof domain, 'string');
    assert.strictEqual(typeof auditSource, 'object');

    debug(`setDashboardDomain: ${domain}`);

    await reverseProxy.writeDashboardConfig(domain);
    const fqdn = dns.fqdn(constants.DASHBOARD_SUBDOMAIN, domain);

    await settings.setDashboardLocation(domain, fqdn);

    await safe(appstore.updateCloudron({ domain }), { debug });

    await eventlog.add(eventlog.ACTION_DASHBOARD_DOMAIN_UPDATE, auditSource, { domain, fqdn });
}

// call this only post activation because it will restart mail server
async function updateDashboardDomain(domain, auditSource) {
    assert.strictEqual(typeof domain, 'string');
    assert.strictEqual(typeof auditSource, 'object');

    debug(`updateDashboardDomain: ${domain}`);

    if (constants.DEMO) throw new BoxError(BoxError.CONFLICT, 'Not allowed in demo mode');

    await setDashboardDomain(domain, auditSource);

    // mark apps using oidc addon to be reconfigured
    const [, installedApps] = await safe(apps.list());
    await safe(apps.configureInstalledApps(installedApps.filter((a) => !!a.manifest.addons.oidc), auditSource));

    await safe(services.rebuildService('turn', auditSource), { debug }); // to update the realm variable

    await oidc.stop();
    await oidc.start();
}

async function setupDnsAndCert(subdomain, domain, auditSource, progressCallback) {
    assert.strictEqual(typeof subdomain, 'string');
    assert.strictEqual(typeof domain, 'string');
    assert.strictEqual(typeof auditSource, 'object');
    assert.strictEqual(typeof progressCallback, 'function');

    const dashboardFqdn = dns.fqdn(subdomain, domain);

    const ipv4 = await network.getIPv4();
    const ipv6 = await network.getIPv6();

    progressCallback({ percent: 20, message: `Updating DNS of ${dashboardFqdn}` });
    await dns.upsertDnsRecords(subdomain, domain, 'A', [ ipv4 ]);
    if (ipv6) await dns.upsertDnsRecords(subdomain, domain, 'AAAA', [ ipv6 ]);
    progressCallback({ percent: 40, message: `Waiting for DNS of ${dashboardFqdn}` });
    await dns.waitForDnsRecord(subdomain, domain, 'A', ipv4, { interval: 30000, times: 50000 });
    if (ipv6) await dns.waitForDnsRecord(subdomain, domain, 'AAAA', ipv6, { interval: 30000, times: 50000 });
    progressCallback({ percent: 60, message: `Getting certificate of ${dashboardFqdn}` });
    const location = { subdomain, domain, fqdn: dashboardFqdn, type: apps.LOCATION_TYPE_DASHBOARD, certificate: null };
    await reverseProxy.ensureCertificate(location, {}, auditSource);
}

async function getTimeZone() {
    const tz = await settings.get(settings.TIME_ZONE_KEY);
    return tz || 'UTC';
}

async function setTimeZone(tz) {
    assert.strictEqual(typeof tz, 'string');

    if (moment.tz.names().indexOf(tz) === -1) throw new BoxError(BoxError.BAD_FIELD, 'Bad timeZone');

    await settings.set(settings.TIME_ZONE_KEY, tz);
    await cron.handleTimeZoneChanged(tz);
}

async function getLanguage() {
    const value = await settings.get(settings.LANGUAGE_KEY);
    return value || 'en';
}

async function setLanguage(language) {
    assert.strictEqual(typeof language, 'string');

    const languages = await translation.listLanguages();
    if (languages.indexOf(language) === -1) throw new BoxError(BoxError.BAD_FIELD, 'Language not found');

    await settings.set(settings.LANGUAGE_KEY, language);
}