'use strict';

exports = module.exports = {
    getAutoupdatePattern,
    setAutoupdatePattern,

    getTimeZone,
    setTimeZone,

    getIPv6Config,
    setIPv6Config,

    getBackupPolicy,
    setBackupPolicy,

    getBackupConfig,
    setBackupConfig,

    getServicesConfig,
    setServicesConfig,

    getRegistryConfig,
    setRegistryConfig,

    getLanguage,
    setLanguage,

    getSysinfoConfig,
    setSysinfoConfig,

    getProfileConfig,
    setProfileConfig,

    getGhosts,
    setGhosts,

    provider,
    list,
    initCache,

    // these values come from the cache
    apiServerOrigin,
    webServerOrigin,
    consoleServerOrigin,
    dashboardDomain,
    setDashboardLocation,
    setMailLocation,

    mailFqdn,
    mailDomain,

    dashboardOrigin,
    dashboardFqdn,

    isDemo,

    get,
    set,

    getBlob,
    setBlob,

    // booleans. if you add an entry here, be sure to fix list()
    DYNAMIC_DNS_KEY: 'dynamic_dns',
    DEMO_KEY: 'demo',

    // json. if you add an entry here, be sure to fix list()
    BACKUP_CONFIG_KEY: 'backup_config',
    BACKUP_POLICY_KEY: 'backup_policy',
    SERVICES_CONFIG_KEY: 'services_config',
    EXTERNAL_LDAP_KEY: 'external_ldap_config',
    DIRECTORY_SERVER_KEY: 'user_directory_config',
    REGISTRY_CONFIG_KEY: 'registry_config',
    SYSINFO_CONFIG_KEY: 'sysinfo_config', // misnomer: ipv4 config
    SUPPORT_CONFIG_KEY: 'support_config',
    PROFILE_CONFIG_KEY: 'profile_config',
    GHOSTS_CONFIG_KEY: 'ghosts_config',
    REVERSE_PROXY_CONFIG_KEY: 'reverseproxy_config',
    IPV6_CONFIG_KEY: 'ipv6_config',

    // strings
    AUTOUPDATE_PATTERN_KEY: 'autoupdate_pattern',
    TIME_ZONE_KEY: 'time_zone',
    OIDC_COOKIE_SECRET_KEY: 'cookie_secret',
    CLOUDRON_NAME_KEY: 'cloudron_name',
    LANGUAGE_KEY: 'language',
    CLOUDRON_ID_KEY: 'cloudron_id',
    APPSTORE_API_TOKEN_KEY: 'appstore_api_token',
    APPSTORE_WEB_TOKEN_KEY: 'appstore_web_token',
    FIREWALL_BLOCKLIST_KEY: 'firewall_blocklist',
    TRUSTED_IPS_KEY: 'trusted_ips_key',

    API_SERVER_ORIGIN_KEY: 'api_server_origin',
    WEB_SERVER_ORIGIN_KEY: 'web_server_origin',
    CONSOLE_SERVER_ORIGIN_KEY: 'console_server_origin',
    DASHBOARD_DOMAIN_KEY: 'admin_domain',
    DASHBOARD_FQDN_KEY: 'admin_fqdn',
    MAIL_DOMAIN_KEY: 'mail_domain',
    MAIL_FQDN_KEY: 'mail_fqdn',
    PROVIDER_KEY: 'provider',

    FOOTER_KEY: 'footer',

    // blobs
    CLOUDRON_AVATAR_KEY: 'cloudron_avatar',

    // testing
    _setApiServerOrigin: setApiServerOrigin,
    _clear: clear,
    _set: set
};

const assert = require('assert'),
    backups = require('./backups.js'),
    BoxError = require('./boxerror.js'),
    constants = require('./constants.js'),
    cron = require('./cron.js'),
    CronJob = require('cron').CronJob,
    database = require('./database.js'),
    debug = require('debug')('box:settings'),
    docker = require('./docker.js'),
    moment = require('moment-timezone'),
    mounts = require('./mounts.js'),
    paths = require('./paths.js'),
    safe = require('safetydance'),
    sysinfo = require('./sysinfo.js'),
    tokens = require('./tokens.js'),
    translation = require('./translation.js'),
    users = require('./users.js'),
    _ = require('underscore');

const SETTINGS_FIELDS = [ 'name', 'value' ].join(',');
const SETTINGS_BLOB_FIELDS = [ 'name', 'valueBlob' ].join(',');

const gDefaults = (function () {
    const result = { };
    result[exports.AUTOUPDATE_PATTERN_KEY] = cron.DEFAULT_AUTOUPDATE_PATTERN;
    result[exports.TIME_ZONE_KEY] = 'UTC';
    result[exports.IPV6_CONFIG_KEY] = {
        provider: 'noop'
    };
    result[exports.LANGUAGE_KEY] = 'en';
    result[exports.BACKUP_CONFIG_KEY] = {
        provider: 'filesystem',
        backupFolder: paths.DEFAULT_BACKUP_DIR,
        format: 'tgz',
        encryption: null,
    };
    result[exports.BACKUP_POLICY_KEY] = {
        retention: { keepWithinSecs: 2 * 24 * 60 * 60 }, // 2 days
        schedule: '00 00 23 * * *' // every day at 11pm
    };
    result[exports.SERVICES_CONFIG_KEY] = {};
    result[exports.REGISTRY_CONFIG_KEY] = {
        provider: 'noop'
    };
    result[exports.SYSINFO_CONFIG_KEY] = {
        provider: 'generic'
    };
    result[exports.PROFILE_CONFIG_KEY] = {
        lockUserProfiles: false,
        mandatory2FA: false
    };

    result[exports.DASHBOARD_DOMAIN_KEY] = '';
    result[exports.DASHBOARD_FQDN_KEY] = '';
    result[exports.MAIL_DOMAIN_KEY] = '';
    result[exports.MAIL_FQDN_KEY] = '';

    result[exports.API_SERVER_ORIGIN_KEY] = 'https://api.cloudron.io';
    result[exports.WEB_SERVER_ORIGIN_KEY] = 'https://cloudron.io';
    result[exports.CONSOLE_SERVER_ORIGIN_KEY] = 'https://console.cloudron.io';
    result[exports.DEMO_KEY] = false;

    result[exports.GHOSTS_CONFIG_KEY] = {};

    return result;
})();

let gCache = {};

function notifyChange(key, value) {
    assert.strictEqual(typeof key, 'string');
    // value is a variant
    cron.handleSettingsChanged(key, value);
}

async function get(key) {
    assert.strictEqual(typeof key, 'string');

    const result = await database.query(`SELECT ${SETTINGS_FIELDS} FROM settings WHERE name = ?`, [ key ]);
    if (result.length === 0) return null; // can't return the default value here because we might need to massage/json parse the result

    return result[0].value;
}

async function set(key, value) {
    assert.strictEqual(typeof key, 'string');
    assert(value === null || typeof value === 'string');

    await database.query('INSERT INTO settings (name, value) VALUES (?, ?) ON DUPLICATE KEY UPDATE value=VALUES(value)', [ key, value ]); // don't rely on affectedRows here since it gives 2
}

async function getBlob(key) {
    assert.strictEqual(typeof key, 'string');

    const result = await database.query(`SELECT ${SETTINGS_BLOB_FIELDS} FROM settings WHERE name = ?`, [ key ]);
    if (result.length === 0) return null;

    return result[0].valueBlob;
}

async function setBlob(key, value) {
    assert.strictEqual(typeof key, 'string');
    assert(value === null || Buffer.isBuffer(value));

    await database.query('INSERT INTO settings (name, valueBlob) VALUES (?, ?) ON DUPLICATE KEY UPDATE valueBlob=VALUES(valueBlob)', [ key, value ]); // don't rely on affectedRows here since it gives 2
}

async function clear() {
    await database.query('DELETE FROM settings');
}

async function setAutoupdatePattern(pattern) {
    assert.strictEqual(typeof pattern, 'string');

    if (pattern !== constants.AUTOUPDATE_PATTERN_NEVER) { // check if pattern is valid
        const job = safe.safeCall(function () { return new CronJob(pattern); });
        if (!job) throw new BoxError(BoxError.BAD_FIELD, 'Invalid pattern');
    }

    await set(exports.AUTOUPDATE_PATTERN_KEY, pattern);
    notifyChange(exports.AUTOUPDATE_PATTERN_KEY, pattern);
}

async function getAutoupdatePattern() {
    const pattern = await get(exports.AUTOUPDATE_PATTERN_KEY);
    if (pattern === null) return gDefaults[exports.AUTOUPDATE_PATTERN_KEY];
    return pattern;
}

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 set(exports.TIME_ZONE_KEY, tz);
    notifyChange(exports.TIME_ZONE_KEY, tz);
}

async function getTimeZone() {
    const tz = await get(exports.TIME_ZONE_KEY);
    if (tz === null) return gDefaults[exports.TIME_ZONE_KEY];
    return tz;
}

async function getIPv6Config() {
    const value = await get(exports.IPV6_CONFIG_KEY);
    if (value === null) return gDefaults[exports.IPV6_CONFIG_KEY];
    return JSON.parse(value);
}

async function setIPv6Config(ipv6Config) {
    assert.strictEqual(typeof ipv6Config, 'object');

    if (isDemo()) throw new BoxError(BoxError.BAD_FIELD, 'Not allowed in demo mode');

    const error = await sysinfo.testIPv6Config(ipv6Config);
    if (error) throw error;

    await set(exports.IPV6_CONFIG_KEY, JSON.stringify(ipv6Config));
    notifyChange(exports.IPV6_CONFIG_KEY, ipv6Config);
}

async function getBackupPolicy() {
    const result = await get(exports.BACKUP_POLICY_KEY);
    if (result === null) return gDefaults[exports.BACKUP_POLICY_KEY];
    return JSON.parse(result);
}

async function setBackupPolicy(policy) {
    assert.strictEqual(typeof policy, 'object');

    const error = await backups.validatePolicy(policy);
    if (error) throw error;

    await set(exports.BACKUP_POLICY_KEY, JSON.stringify(policy));
    notifyChange(exports.BACKUP_POLICY_KEY, policy);
}

async function getBackupConfig() {
    const value = await get(exports.BACKUP_CONFIG_KEY);
    if (value === null) return gDefaults[exports.BACKUP_CONFIG_KEY];

    const backupConfig = JSON.parse(value); // { provider, token, password, region, prefix, bucket }
    return backupConfig;
}

async function setBackupConfig(backupConfig) {
    assert.strictEqual(typeof backupConfig, 'object');

    const oldConfig = await getBackupConfig();

    backups.injectPrivateFields(backupConfig, oldConfig);

    if (mounts.isManagedProvider(backupConfig.provider)) {
        let error = mounts.validateMountOptions(backupConfig.provider, backupConfig.mountOptions);
        if (error) throw error;

        [error] = await safe(mounts.tryAddMount(mounts.mountObjectFromBackupConfig(backupConfig), { timeout: 10 })); // 10 seconds

        if (error) {
            if (mounts.isManagedProvider(oldConfig.provider)) { // put back the old mount configuration
                debug('setBackupConfig: rolling back to previous mount configuration');

                await safe(mounts.tryAddMount(mounts.mountObjectFromBackupConfig(oldConfig), { timeout: 10 }));
            }

            throw error;
        }
    }

    const error = await backups.testConfig(backupConfig);
    if (error) throw error;

    if ('password' in backupConfig) { // user set password
        const error = await backups.validateEncryptionPassword(backupConfig.password);
        if (error) throw error;

        backupConfig.encryption = backups.generateEncryptionKeysSync(backupConfig.password);
        delete backupConfig.password;
    }

    // if any of these changes, we have to clear the cache
    if (!_.isEqual(_.omit(backupConfig, 'limits'), _.omit(oldConfig, 'limits'))) {
        debug('setBackupConfig: clearing backup cache');
        backups.cleanupCacheFilesSync();
    }

    await set(exports.BACKUP_CONFIG_KEY, JSON.stringify(backupConfig));

    if (mounts.isManagedProvider(oldConfig.provider) && !mounts.isManagedProvider(backupConfig.provider)) {
        debug('setBackupConfig: removing old backup mount point');
        await safe(mounts.removeMount(mounts.mountObjectFromBackupConfig(oldConfig)));
    }

    notifyChange(exports.BACKUP_CONFIG_KEY, backupConfig);
}

async function getServicesConfig() {
    const value = await get(exports.SERVICES_CONFIG_KEY);
    if (value === null) return gDefaults[exports.SERVICES_CONFIG_KEY];
    return JSON.parse(value);
}

async function setServicesConfig(platformConfig) {
    await set(exports.SERVICES_CONFIG_KEY, JSON.stringify(platformConfig));
    notifyChange(exports.SERVICES_CONFIG_KEY, platformConfig);
}

async function getRegistryConfig() {
    const value = await get(exports.REGISTRY_CONFIG_KEY);
    if (value === null) return gDefaults[exports.REGISTRY_CONFIG_KEY];
    return JSON.parse(value);
}

async function setRegistryConfig(registryConfig) {
    assert.strictEqual(typeof registryConfig, 'object');

    const currentConfig = await getRegistryConfig();

    docker.injectPrivateFields(registryConfig, currentConfig);

    await docker.testRegistryConfig(registryConfig);

    await set(exports.REGISTRY_CONFIG_KEY, JSON.stringify(registryConfig));

    notifyChange(exports.REGISTRY_CONFIG_KEY, registryConfig);
}

async function getSysinfoConfig() {
    const value = await get(exports.SYSINFO_CONFIG_KEY);
    if (value === null) return gDefaults[exports.SYSINFO_CONFIG_KEY];
    return JSON.parse(value);
}

async function setSysinfoConfig(sysinfoConfig) {
    assert.strictEqual(typeof sysinfoConfig, 'object');

    if (isDemo()) throw new BoxError(BoxError.BAD_FIELD, 'Not allowed in demo mode');

    const error = await sysinfo.testIPv4Config(sysinfoConfig);
    if (error) throw error;

    await set(exports.SYSINFO_CONFIG_KEY, JSON.stringify(sysinfoConfig));

    notifyChange(exports.SYSINFO_CONFIG_KEY, sysinfoConfig);
}

async function getProfileConfig() {
    const value = await get(exports.PROFILE_CONFIG_KEY);
    if (value === null) return gDefaults[exports.PROFILE_CONFIG_KEY];
    return JSON.parse(value);
}

async function setProfileConfig(directoryConfig) {
    assert.strictEqual(typeof directoryConfig, 'object');

    if (isDemo()) throw new BoxError(BoxError.BAD_FIELD, 'Not allowed in demo mode');

    const oldConfig = await getProfileConfig();
    await set(exports.PROFILE_CONFIG_KEY, JSON.stringify(directoryConfig));

    if (directoryConfig.mandatory2FA && !oldConfig.mandatory2FA) {
        debug('setProfileConfig: logging out non-2FA users to enforce 2FA');

        const allUsers = await users.list();
        for (const user of allUsers) {
            if (!user.twoFactorAuthenticationEnabled) await tokens.delByUserIdAndType(user.id, tokens.ID_WEBADMIN);
        }
    }

    notifyChange(exports.PROFILE_CONFIG_KEY, directoryConfig);
}

async function getGhosts() {
    const value = await get(exports.GHOSTS_CONFIG_KEY);
    if (value === null) return gDefaults[exports.GHOSTS_CONFIG_KEY];

    return JSON.parse(value);
}

async function setGhosts(ghosts) {
    assert.strictEqual(typeof ghosts, 'object');

    await set(exports.GHOSTS_CONFIG_KEY, JSON.stringify(ghosts));
    notifyChange(exports.GHOSTS_CONFIG_KEY, ghosts);
}

async function getLanguage() {
    const value = await get(exports.LANGUAGE_KEY);
    if (value === null) return gDefaults[exports.LANGUAGE_KEY];
    return value;
}

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

    const languages = await translation.getLanguages();

    if (languages.indexOf(language) === -1) throw new BoxError(BoxError.NOT_FOUND, 'Language not found');

    await set(exports.LANGUAGE_KEY, language);
    notifyChange(exports.LANGUAGE_KEY, language);
}

async function list() {
    const settings = await database.query(`SELECT ${SETTINGS_FIELDS} FROM settings WHERE value IS NOT NULL ORDER BY name`);

    const result = Object.assign({}, gDefaults);
    settings.forEach(function (setting) { result[setting.name] = setting.value; });

    // convert booleans
    result[exports.DEMO_KEY] = !!result[exports.DEMO_KEY];

    // convert JSON objects
    [exports.BACKUP_POLICY_KEY, exports.BACKUP_CONFIG_KEY, exports.IPV6_CONFIG_KEY, exports.PROFILE_CONFIG_KEY, exports.SERVICES_CONFIG_KEY,
        exports.REGISTRY_CONFIG_KEY, exports.SYSINFO_CONFIG_KEY, exports.REVERSE_PROXY_CONFIG_KEY ].forEach(function (key) {
        result[key] = typeof result[key] === 'object' ? result[key] : safe.JSON.parse(result[key]);
    });

    return result;
}

async function initCache() {
    debug('initCache: pre-load settings');

    const allSettings = await list();
    const provider = safe.fs.readFileSync(paths.PROVIDER_FILE, 'utf8');

    gCache = {
        apiServerOrigin: allSettings[exports.API_SERVER_ORIGIN_KEY],
        webServerOrigin: allSettings[exports.WEB_SERVER_ORIGIN_KEY],
        consoleServerOrigin: allSettings[exports.CONSOLE_SERVER_ORIGIN_KEY],
        dashboardDomain: allSettings[exports.DASHBOARD_DOMAIN_KEY],
        dashboardFqdn: allSettings[exports.DASHBOARD_FQDN_KEY],
        mailDomain: allSettings[exports.MAIL_DOMAIN_KEY],
        mailFqdn: allSettings[exports.MAIL_FQDN_KEY],
        isDemo: allSettings[exports.DEMO_KEY],
        provider: provider ? provider.trim() : 'generic'
    };
}

// this is together so we can do this in a transaction later
async function setDashboardLocation(dashboardDomain, dashboardFqdn) {
    assert.strictEqual(typeof dashboardDomain, 'string');
    assert.strictEqual(typeof dashboardFqdn, 'string');

    await set(exports.DASHBOARD_DOMAIN_KEY, dashboardDomain);
    await set(exports.DASHBOARD_FQDN_KEY, dashboardFqdn);

    gCache.dashboardDomain = dashboardDomain;
    gCache.dashboardFqdn = dashboardFqdn;
}

async function setMailLocation(mailDomain, mailFqdn) {
    assert.strictEqual(typeof mailDomain, 'string');
    assert.strictEqual(typeof mailFqdn, 'string');

    await set(exports.MAIL_DOMAIN_KEY, mailDomain);
    await set(exports.MAIL_FQDN_KEY, mailFqdn);

    gCache.mailDomain = mailDomain;
    gCache.mailFqdn = mailFqdn;
}

async function setApiServerOrigin(origin) {
    assert.strictEqual(typeof origin, 'string');

    await set(exports.API_SERVER_ORIGIN_KEY, origin);

    gCache.apiServerOrigin = origin;
    notifyChange(exports.API_SERVER_ORIGIN_KEY, origin);
}

function provider() { return gCache.provider; }
function apiServerOrigin() { return gCache.apiServerOrigin; }
function webServerOrigin() { return gCache.webServerOrigin; }
function consoleServerOrigin() { return gCache.consoleServerOrigin; }
function dashboardDomain() { return gCache.dashboardDomain; }
function dashboardFqdn() { return gCache.dashboardFqdn; }
function isDemo() { return gCache.isDemo; }
function mailDomain() { return gCache.mailDomain; }
function mailFqdn() { return gCache.mailFqdn; }
function dashboardOrigin() { return 'https://' + dashboardFqdn(); }