'use strict';

exports = module.exports = {
    setup: setup,
    restore: restore,
    activate: activate,
    getStatus: getStatus
};

var assert = require('assert'),
    async = require('async'),
    backups = require('./backups.js'),
    BoxError = require('./boxerror.js'),
    branding = require('./branding.js'),
    constants = require('./constants.js'),
    cloudron = require('./cloudron.js'),
    debug = require('debug')('box:provision'),
    domains = require('./domains.js'),
    eventlog = require('./eventlog.js'),
    mail = require('./mail.js'),
    semver = require('semver'),
    settings = require('./settings.js'),
    sysinfo = require('./sysinfo.js'),
    users = require('./users.js'),
    tld = require('tldjs'),
    tokens = require('./tokens.js'),
    _ = require('underscore');

const NOOP_CALLBACK = function (error) { if (error) debug(error); };

// we cannot use tasks since the tasks table gets overwritten when db is imported
let gProvisionStatus = {
    setup: {
        active: false,
        message: '',
        errorMessage: null
    },
    restore: {
        active: false,
        message: '',
        errorMessage: null
    }
};

function setProgress(task, message, callback) {
    debug(`setProgress: ${task} - ${message}`);
    gProvisionStatus[task].message = message;
    callback();
}

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

    debug('unprovision');

    // TODO: also cancel any existing configureWebadmin task
    async.series([
        settings.setAdminLocation.bind(null, '', ''),
        mail.clearDomains,
        domains.clear
    ], callback);
}


function setup(dnsConfig, sysinfoConfig, auditSource, callback) {
    assert.strictEqual(typeof dnsConfig, 'object');
    assert.strictEqual(typeof sysinfoConfig, 'object');
    assert.strictEqual(typeof auditSource, 'object');
    assert.strictEqual(typeof callback, 'function');

    if (gProvisionStatus.setup.active || gProvisionStatus.restore.active) return callback(new BoxError(BoxError.BAD_STATE, 'Already setting up or restoring'));

    gProvisionStatus.setup = { active: true, errorMessage: '', message: 'Adding domain' };

    function done(error) {
        gProvisionStatus.setup.active = false;
        gProvisionStatus.setup.errorMessage = error ? error.message : '';
        callback(error);
    }

    users.isActivated(function (error, activated) {
        if (error) return done(error);
        if (activated) return done(new BoxError(BoxError.CONFLICT, 'Already activated', { activate: true }));

        unprovision(function (error) {
            if (error) return done(error);

            const domain = dnsConfig.domain.toLowerCase();
            const zoneName = dnsConfig.zoneName ? dnsConfig.zoneName : (tld.getDomain(domain) || domain);

            debug(`provision: Setting up Cloudron with domain ${domain} and zone ${zoneName}`);

            let data = {
                zoneName: zoneName,
                provider: dnsConfig.provider,
                config: dnsConfig.config,
                fallbackCertificate: dnsConfig.fallbackCertificate || null,
                tlsConfig: dnsConfig.tlsConfig || { provider: 'letsencrypt-prod' },
                dkimSelector: 'cloudron'
            };

            async.series([
                settings.setMailLocation.bind(null, domain, `${constants.ADMIN_LOCATION}.${domain}`), // default mail location. do this before we add the domain for upserting mail DNS
                domains.add.bind(null, domain, data, auditSource),
                sysinfo.testConfig.bind(null, sysinfoConfig)
            ], function (error) {
                if (error) return done(error);

                callback(); // now that args are validated run the task in the background

                async.series([
                    settings.setSysinfoConfig.bind(null, sysinfoConfig),
                    cloudron.setupDnsAndCert.bind(null, constants.ADMIN_LOCATION, domain, auditSource, (progress) => setProgress('setup', progress.message, NOOP_CALLBACK)),
                    cloudron.setDashboardDomain.bind(null, domain, auditSource),
                    setProgress.bind(null, 'setup', 'Done'),
                    eventlog.add.bind(null, eventlog.ACTION_PROVISION, auditSource, { })
                ], function (error) {
                    gProvisionStatus.setup.active = false;
                    gProvisionStatus.setup.errorMessage = error ? error.message : '';
                });
            });
        });
    });
}

function activate(username, password, email, displayName, ip, auditSource, callback) {
    assert.strictEqual(typeof username, 'string');
    assert.strictEqual(typeof password, 'string');
    assert.strictEqual(typeof email, 'string');
    assert.strictEqual(typeof displayName, 'string');
    assert.strictEqual(typeof ip, 'string');
    assert.strictEqual(typeof auditSource, 'object');
    assert.strictEqual(typeof callback, 'function');

    debug('activating user:%s email:%s', username, email);

    users.createOwner(username, password, email, displayName, auditSource, function (error, userObject) {
        if (error && error.reason === BoxError.ALREADY_EXISTS) return callback(new BoxError(BoxError.CONFLICT, 'Already activated'));
        if (error) return callback(error);

        tokens.add(tokens.ID_WEBADMIN, userObject.id, Date.now() + constants.DEFAULT_TOKEN_EXPIRATION, {}, function (error, result) {
            if (error) return callback(error);

            eventlog.add(eventlog.ACTION_ACTIVATE, auditSource, { });

            callback(null, {
                userId: userObject.id,
                token: result.accessToken,
                expires: result.expires
            });

            setImmediate(cloudron.onActivated.bind(null, NOOP_CALLBACK)); // hack for now to not block the above http response
        });
    });
}

function restore(backupConfig, backupId, version, sysinfoConfig, auditSource, callback) {
    assert.strictEqual(typeof backupConfig, 'object');
    assert.strictEqual(typeof backupId, 'string');
    assert.strictEqual(typeof version, 'string');
    assert.strictEqual(typeof sysinfoConfig, 'object');
    assert.strictEqual(typeof auditSource, 'object');
    assert.strictEqual(typeof callback, 'function');

    if (!semver.valid(version)) return callback(new BoxError(BoxError.BAD_FIELD, 'version is not a valid semver', { field: 'version' }));
    if (constants.VERSION !== version) return callback(new BoxError(BoxError.BAD_STATE, `Run "cloudron-setup --version ${version}" on a fresh Ubuntu installation to restore from this backup`));

    if (gProvisionStatus.setup.active || gProvisionStatus.restore.active) return callback(new BoxError(BoxError.BAD_STATE, 'Already setting up or restoring'));

    gProvisionStatus.restore = { active: true, errorMessage: '', message: 'Testing backup config' };

    function done(error) {
        gProvisionStatus.restore.active = false;
        gProvisionStatus.restore.errorMessage = error ? error.message : '';
        callback(error);
    }

    users.isActivated(function (error, activated) {
        if (error) return done(error);
        if (activated) return done(new BoxError(BoxError.CONFLICT, 'Already activated. Restore with a fresh Cloudron installation.'));

        backups.testProviderConfig(backupConfig, function (error) {
            if (error) return done(error);

            if ('password' in backupConfig) {
                backupConfig.encryption = backups.generateEncryptionKeysSync(backupConfig.password);
                delete backupConfig.password;
            } else {
                backupConfig.encryption = null;
            }

            sysinfo.testConfig(sysinfoConfig, function (error) {
                if (error) return done(error);

                debug(`restore: restoring from ${backupId} from provider ${backupConfig.provider} with format ${backupConfig.format}`);

                callback(); // now that the fields are validated, continue task in the background

                async.series([
                    setProgress.bind(null, 'restore', 'Downloading backup'),
                    backups.restore.bind(null, backupConfig, backupId, (progress) => setProgress('restore', progress.message, NOOP_CALLBACK)),
                    settings.setSysinfoConfig.bind(null, sysinfoConfig),
                    (done) => {
                        const adminDomain = settings.adminDomain(); // load this fresh from after the backup.restore
                        async.series([
                            cloudron.setupDnsAndCert.bind(null, constants.ADMIN_LOCATION, adminDomain, auditSource, (progress) => setProgress('restore', progress.message, NOOP_CALLBACK)),
                            cloudron.setDashboardDomain.bind(null, adminDomain, auditSource)
                        ], done);
                    },
                    settings.setBackupCredentials.bind(null, backupConfig), // update just the credentials and not the policy and flags
                    eventlog.add.bind(null, eventlog.ACTION_RESTORE, auditSource, { backupId }),
                ], function (error) {
                    gProvisionStatus.restore.active = false;
                    gProvisionStatus.restore.errorMessage = error ? error.message : '';

                    if (!error) cloudron.onActivated(NOOP_CALLBACK);
                });
            });
        });
    });
}

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

    users.isActivated(function (error, activated) {
        if (error) return callback(error);

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

            callback(null, _.extend({
                version: constants.VERSION,
                apiServerOrigin: settings.apiServerOrigin(), // used by CaaS tool
                webServerOrigin: settings.webServerOrigin(), // used by CaaS tool
                cloudronName: allSettings[settings.CLOUDRON_NAME_KEY],
                footer: branding.renderFooter(allSettings[settings.FOOTER_KEY] || constants.FOOTER),
                adminFqdn: settings.adminDomain() ? settings.adminFqdn() : null,
                language: allSettings[settings.LANGUAGE_KEY],
                activated: activated,
                provider: settings.provider() // used by setup wizard of marketplace images
            }, gProvisionStatus));
        });
    });
}