'use strict';

exports = module.exports = {
    getAppAutoupdatePattern: getAppAutoupdatePattern,
    setAppAutoupdatePattern: setAppAutoupdatePattern,

    getBoxAutoupdatePattern: getBoxAutoupdatePattern,
    setBoxAutoupdatePattern: setBoxAutoupdatePattern,

    getTimeZone: getTimeZone,
    setTimeZone: setTimeZone,

    getCloudronName: getCloudronName,
    setCloudronName: setCloudronName,

    getCloudronAvatar: getCloudronAvatar,
    setCloudronAvatar: setCloudronAvatar,

    getDynamicDnsConfig: getDynamicDnsConfig,
    setDynamicDnsConfig: setDynamicDnsConfig,

    getUnstableAppsConfig: getUnstableAppsConfig,
    setUnstableAppsConfig: setUnstableAppsConfig,

    getBackupConfig: getBackupConfig,
    setBackupConfig: setBackupConfig,

    getPlatformConfig: getPlatformConfig,
    setPlatformConfig: setPlatformConfig,

    getExternalLdapConfig: getExternalLdapConfig,
    setExternalLdapConfig: setExternalLdapConfig,

    getRegistryConfig: getRegistryConfig,
    setRegistryConfig: setRegistryConfig,

    getLicenseKey: getLicenseKey,
    setLicenseKey: setLicenseKey,

    getCloudronId: getCloudronId,
    setCloudronId: setCloudronId,

    getCloudronToken: getCloudronToken,
    setCloudronToken: setCloudronToken,

    getAll: getAll,

    initCache: initCache,

    // these values come from the cache
    apiServerOrigin: apiServerOrigin,
    webServerOrigin: webServerOrigin,
    adminDomain: adminDomain,
    setAdmin: setAdmin,
    // these values are derived
    adminOrigin: adminOrigin,
    adminFqdn: adminFqdn,
    mailFqdn: mailFqdn,

    isDemo: isDemo,

    // booleans. if you add an entry here, be sure to fix getAll
    DYNAMIC_DNS_KEY: 'dynamic_dns',
    UNSTABLE_APPS_KEY: 'unstable_apps',
    DEMO_KEY: 'demo',

    // json. if you add an entry here, be sure to fix getAll
    BACKUP_CONFIG_KEY: 'backup_config',
    PLATFORM_CONFIG_KEY: 'platform_config',
    EXTERNAL_LDAP_KEY: 'external_ldap_config',
    REGISTRY_CONFIG_KEY: 'registry_config',

    // strings
    APP_AUTOUPDATE_PATTERN_KEY: 'app_autoupdate_pattern',
    BOX_AUTOUPDATE_PATTERN_KEY: 'box_autoupdate_pattern',
    TIME_ZONE_KEY: 'time_zone',
    CLOUDRON_NAME_KEY: 'cloudron_name',
    LICENSE_KEY: 'license_key',
    CLOUDRON_ID_KEY: 'cloudron_id',
    CLOUDRON_TOKEN_KEY: 'cloudron_token',

    API_SERVER_ORIGIN_KEY: 'api_server_origin',
    WEB_SERVER_ORIGIN_KEY: 'web_server_origin',
    ADMIN_DOMAIN_KEY: 'admin_domain',
    ADMIN_FQDN_KEY: 'admin_fqdn',
    PROVIDER_KEY: 'provider',

    // blobs
    CLOUDRON_AVATAR_KEY: 'cloudron_avatar', // not stored in db but can be used for locked flag

    // testing
    _setApiServerOrigin: setApiServerOrigin
};

var addons = require('./addons.js'),
    assert = require('assert'),
    backups = require('./backups.js'),
    BoxError = require('./boxerror.js'),
    constants = require('./constants.js'),
    cron = require('./cron.js'),
    CronJob = require('cron').CronJob,
    debug = require('debug')('box:settings'),
    docker = require('./docker.js'),
    externalLdap = require('./externalldap.js'),
    moment = require('moment-timezone'),
    paths = require('./paths.js'),
    safe = require('safetydance'),
    settingsdb = require('./settingsdb.js'),
    util = require('util'),
    _ = require('underscore');

let gDefaults = (function () {
    var result = { };
    result[exports.APP_AUTOUPDATE_PATTERN_KEY] = '00 30 1,3,5,23 * * *';
    result[exports.BOX_AUTOUPDATE_PATTERN_KEY] = '00 00 1,3,5,23 * * *';
    result[exports.TIME_ZONE_KEY] = 'America/Los_Angeles';
    result[exports.CLOUDRON_NAME_KEY] = 'Cloudron';
    result[exports.DYNAMIC_DNS_KEY] = false;
    result[exports.UNSTABLE_APPS_KEY] = false;
    result[exports.LICENSE_KEY] = '';
    result[exports.CLOUDRON_ID_KEY] = '';
    result[exports.CLOUDRON_TOKEN_KEY] = '';
    result[exports.BACKUP_CONFIG_KEY] = {
        provider: 'filesystem',
        key: '',
        backupFolder: '/var/backups',
        format: 'tgz',
        retentionSecs: 2 * 24 * 60 * 60, // 2 days
        intervalSecs: 24 * 60 * 60 // ~1 day
    };
    result[exports.PLATFORM_CONFIG_KEY] = {};
    result[exports.EXTERNAL_LDAP_KEY] = {
        provider: 'noop'
    };
    result[exports.REGISTRY_CONFIG_KEY] = {};
    result[exports.ADMIN_DOMAIN_KEY] = '';
    result[exports.ADMIN_FQDN_KEY] = '';
    result[exports.API_SERVER_ORIGIN_KEY] = 'https://api.cloudron.io';
    result[exports.WEB_SERVER_ORIGIN_KEY] = 'https://cloudron.io';
    result[exports.DEMO_KEY] = false;

    return result;
})();

let gCache = {};

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

function setAppAutoupdatePattern(pattern, callback) {
    assert.strictEqual(typeof pattern, 'string');
    assert.strictEqual(typeof callback, 'function');

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

    settingsdb.set(exports.APP_AUTOUPDATE_PATTERN_KEY, pattern, function (error) {
        if (error) return callback(error);

        notifyChange(exports.APP_AUTOUPDATE_PATTERN_KEY, pattern);

        return callback(null);
    });
}

function getAppAutoupdatePattern(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.APP_AUTOUPDATE_PATTERN_KEY, function (error, pattern) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.APP_AUTOUPDATE_PATTERN_KEY]);
        if (error) return callback(error);

        callback(null, pattern);
    });
}

function setBoxAutoupdatePattern(pattern, callback) {
    assert.strictEqual(typeof pattern, 'string');
    assert.strictEqual(typeof callback, 'function');

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

    settingsdb.set(exports.BOX_AUTOUPDATE_PATTERN_KEY, pattern, function (error) {
        if (error) return callback(error);

        notifyChange(exports.BOX_AUTOUPDATE_PATTERN_KEY, pattern);

        return callback(null);
    });
}

function getBoxAutoupdatePattern(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.BOX_AUTOUPDATE_PATTERN_KEY, function (error, pattern) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.BOX_AUTOUPDATE_PATTERN_KEY]);
        if (error) return callback(error);

        callback(null, pattern);
    });
}

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

    if (moment.tz.names().indexOf(tz) === -1) return callback(new BoxError(BoxError.BAD_FIELD, 'Bad timeZone', { field: 'timezone' }));

    settingsdb.set(exports.TIME_ZONE_KEY, tz, function (error) {
        if (error) return callback(error);

        notifyChange(exports.TIME_ZONE_KEY, tz);

        return callback(null);
    });
}

function getTimeZone(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.TIME_ZONE_KEY, function (error, tz) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.TIME_ZONE_KEY]);
        if (error) return callback(error);

        callback(null, tz);
    });
}

function getCloudronName(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.CLOUDRON_NAME_KEY, function (error, name) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.CLOUDRON_NAME_KEY]);
        if (error) return callback(error);

        callback(null, name);
    });
}

function setCloudronName(name, callback) {
    assert.strictEqual(typeof name, 'string');
    assert.strictEqual(typeof callback, 'function');

    if (!name) return callback(new BoxError(BoxError.BAD_FIELD, 'name is empty', { field: 'name' }));

    // some arbitrary restrictions (for sake of ui layout)
    if (name.length > 32) return callback(new BoxError(BoxError.BAD_FIELD, 'name cannot exceed 32 characters', { field: 'name' }));

    settingsdb.set(exports.CLOUDRON_NAME_KEY, name, function (error) {
        if (error) return callback(error);

        notifyChange(exports.CLOUDRON_NAME_KEY, name);

        return callback(null);
    });
}

function getCloudronAvatar(callback) {
    assert.strictEqual(typeof callback, 'function');

    var avatar = safe.fs.readFileSync(paths.CLOUDRON_AVATAR_FILE);
    if (avatar) return callback(null, avatar);

    // try default fallback
    avatar = safe.fs.readFileSync(paths.CLOUDRON_DEFAULT_AVATAR_FILE);
    if (avatar) return callback(null, avatar);

    callback(new BoxError(BoxError.FS_ERROR, safe.error));
}

function setCloudronAvatar(avatar, callback) {
    assert(util.isBuffer(avatar));
    assert.strictEqual(typeof callback, 'function');

    if (!safe.fs.writeFileSync(paths.CLOUDRON_AVATAR_FILE, avatar)) {
        return callback(new BoxError(BoxError.FS_ERROR, safe.error));
    }

    return callback(null);
}

function getDynamicDnsConfig(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.DYNAMIC_DNS_KEY, function (error, enabled) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.DYNAMIC_DNS_KEY]);
        if (error) return callback(error);

        callback(null, !!enabled); // settingsdb holds string values only
    });
}

function setDynamicDnsConfig(enabled, callback) {
    assert.strictEqual(typeof enabled, 'boolean');
    assert.strictEqual(typeof callback, 'function');

    // settingsdb takes string values only
    settingsdb.set(exports.DYNAMIC_DNS_KEY, enabled ? 'enabled' : '', function (error) {
        if (error) return callback(error);

        notifyChange(exports.DYNAMIC_DNS_KEY, enabled);

        return callback(null);
    });
}

function getUnstableAppsConfig(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.UNSTABLE_APPS_KEY, function (error, enabled) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.UNSTABLE_APPS_KEY]);
        if (error) return callback(error);

        callback(null, !!enabled); // settingsdb holds string values only
    });
}

function setUnstableAppsConfig(enabled, callback) {
    assert.strictEqual(typeof enabled, 'boolean');
    assert.strictEqual(typeof callback, 'function');

    // settingsdb takes string values only
    settingsdb.set(exports.UNSTABLE_APPS_KEY, enabled ? 'enabled' : '', function (error) {
        if (error) return callback(error);

        notifyChange(exports.UNSTABLE_APPS_KEY, enabled);

        return callback(null);
    });
}

function getBackupConfig(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.BACKUP_CONFIG_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.BACKUP_CONFIG_KEY]);
        if (error) return callback(error);

        callback(null, JSON.parse(value)); // provider, token, key, region, prefix, bucket
    });
}

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

    getBackupConfig(function (error, curentConfig) {
        if (error) return callback(error);

        backups.injectPrivateFields(backupConfig, curentConfig);

        backups.testConfig(backupConfig, function (error) {
            if (error) return callback(error);

            backups.cleanupCacheFilesSync();

            settingsdb.set(exports.BACKUP_CONFIG_KEY, JSON.stringify(backupConfig), function (error) {
                if (error) return callback(error);

                notifyChange(exports.BACKUP_CONFIG_KEY, backupConfig);

                callback(null);
            });
        });
    });
}

function getPlatformConfig(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.PLATFORM_CONFIG_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.PLATFORM_CONFIG_KEY]);
        if (error) return callback(error);

        callback(null, JSON.parse(value));
    });
}

function setPlatformConfig(platformConfig, callback) {
    assert.strictEqual(typeof callback, 'function');

    for (let addon of [ 'mysql', 'postgresql', 'mail', 'mongodb' ]) {
        if (!platformConfig[addon]) continue;
        if (platformConfig[addon].memorySwap < platformConfig[addon].memory) return callback(new BoxError(BoxError.BAD_FIELD, 'memorySwap must be larger than memory', { field: 'memory', addon }));
    }

    settingsdb.set(exports.PLATFORM_CONFIG_KEY, JSON.stringify(platformConfig), function (error) {
        if (error) return callback(error);

        addons.updateServiceConfig(platformConfig, callback);
    });
}

function getExternalLdapConfig(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.EXTERNAL_LDAP_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.EXTERNAL_LDAP_KEY]);
        if (error) return callback(error);

        callback(null, JSON.parse(value));
    });
}

function setExternalLdapConfig(externalLdapConfig, callback) {
    assert.strictEqual(typeof externalLdapConfig, 'object');
    assert.strictEqual(typeof callback, 'function');

    getExternalLdapConfig(function (error, curentConfig) {
        if (error) return callback(error);

        externalLdap.injectPrivateFields(externalLdapConfig, curentConfig);

        externalLdap.testConfig(externalLdapConfig, function (error) {
            if (error) return callback(error);

            settingsdb.set(exports.EXTERNAL_LDAP_KEY, JSON.stringify(externalLdapConfig), function (error) {
                if (error) return callback(error);

                notifyChange(exports.EXTERNAL_LDAP_KEY, externalLdapConfig);

                callback(null);
            });
        });
    });
}

function getRegistryConfig(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.REGISTRY_CONFIG_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.REGISTRY_CONFIG_KEY]);
        if (error) return callback(error);

        callback(null, JSON.parse(value));
    });
}

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

    getRegistryConfig(function (error, curentConfig) {
        if (error) return callback(error);

        docker.injectPrivateFields(registryConfig, curentConfig);

        docker.testRegistryConfig(registryConfig, function (error) {
            if (error) return callback(error);

            settingsdb.set(exports.REGISTRY_CONFIG_KEY, JSON.stringify(registryConfig), function (error) {
                if (error) return callback(error);

                notifyChange(exports.REGISTRY_CONFIG_KEY, registryConfig);

                callback(null);
            });
        });
    });
}

function getLicenseKey(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.LICENSE_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.LICENSE_KEY]);
        if (error) return callback(error);

        callback(null, value);
    });
}

function setLicenseKey(licenseKey, callback) {
    assert.strictEqual(typeof licenseKey, 'string');
    assert.strictEqual(typeof callback, 'function');

    settingsdb.set(exports.LICENSE_KEY, licenseKey, function (error) {
        if (error) return callback(error);

        notifyChange(exports.LICENSE_KEY, licenseKey);

        callback(null);
    });
}

function getCloudronId(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.CLOUDRON_ID_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.CLOUDRON_ID_KEY]);
        if (error) return callback(error);

        callback(null, value);
    });
}

function setCloudronId(cid, callback) {
    assert.strictEqual(typeof cid, 'string');
    assert.strictEqual(typeof callback, 'function');

    settingsdb.set(exports.CLOUDRON_ID_KEY, cid, function (error) {
        if (error) return callback(error);

        notifyChange(exports.CLOUDRON_ID_KEY, cid);

        callback(null);
    });
}

function getCloudronToken(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.get(exports.CLOUDRON_TOKEN_KEY, function (error, value) {
        if (error && error.reason === BoxError.NOT_FOUND) return callback(null, gDefaults[exports.CLOUDRON_TOKEN_KEY]);
        if (error) return callback(error);

        callback(null, value);
    });
}

function setCloudronToken(token, callback) {
    assert.strictEqual(typeof token, 'string');
    assert.strictEqual(typeof callback, 'function');

    settingsdb.set(exports.CLOUDRON_TOKEN_KEY, token, function (error) {
        if (error) return callback(error);

        notifyChange(exports.CLOUDRON_TOKEN_KEY, token);

        callback(null);
    });
}

function getAll(callback) {
    assert.strictEqual(typeof callback, 'function');

    settingsdb.getAll(function (error, settings) {
        if (error) return callback(error);

        var result = _.extend({ }, gDefaults);
        settings.forEach(function (setting) { result[setting.name] = setting.value; });

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

        // convert JSON objects
        [exports.BACKUP_CONFIG_KEY, exports.PLATFORM_CONFIG_KEY, exports.EXTERNAL_LDAP_KEY, exports.REGISTRY_CONFIG_KEY ].forEach(function (key) {
            result[key] = typeof result[key] === 'object' ? result[key] : safe.JSON.parse(result[key]);
        });

        callback(null, result);
    });
}

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

    getAll(function (error, allSettings) {
        if (error) return callback(error);

        gCache = {
            apiServerOrigin: allSettings[exports.API_SERVER_ORIGIN_KEY],
            webServerOrigin: allSettings[exports.WEB_SERVER_ORIGIN_KEY],
            adminDomain: allSettings[exports.ADMIN_DOMAIN_KEY],
            adminFqdn: allSettings[exports.ADMIN_FQDN_KEY],
            isDemo: allSettings[exports.DEMO_KEY]
        };

        callback();
    });
}

// this is together so we can do this in a transaction later
function setAdmin(adminDomain, adminFqdn, callback) {
    assert.strictEqual(typeof adminDomain, 'string');
    assert.strictEqual(typeof adminFqdn, 'string');
    assert.strictEqual(typeof callback, 'function');

    settingsdb.set(exports.ADMIN_DOMAIN_KEY, adminDomain, function (error) {
        if (error) return callback(error);

        settingsdb.set(exports.ADMIN_FQDN_KEY, adminFqdn, function (error) {
            if (error) return callback(error);

            gCache.adminDomain = adminDomain;
            gCache.adminFqdn = adminFqdn;

            callback(null);
        });
    });
}

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

    settingsdb.set(exports.API_SERVER_ORIGIN_KEY, origin, function (error) {
        if (error) return callback(error);

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

        callback(null);
    });
}

function apiServerOrigin() { return gCache.apiServerOrigin; }
function webServerOrigin() { return gCache.webServerOrigin; }
function adminDomain() { return gCache.adminDomain; }
function adminFqdn() { return gCache.adminFqdn; }
function isDemo() { return gCache.isDemo; }
function mailFqdn() { return adminFqdn(); }
function adminOrigin() { return 'https://' + adminFqdn(); }