'use strict';

exports = module.exports = {
    login,
    logout,
    passwordResetRequest,
    passwordReset,
    setupAccount,
    reboot,
    isRebootRequired,
    getConfig,
    getDisks,
    getMemory,
    getUpdateInfo,
    update,
    checkForUpdates,
    getLogs,
    getLogStream,
    updateDashboardDomain,
    prepareDashboardDomain,
    renewCerts,
    getServerIp,
    getLanguages,
    syncExternalLdap,
    syncDnsRecords
};

const assert = require('assert'),
    auditSource = require('../auditsource.js'),
    BoxError = require('../boxerror.js'),
    cloudron = require('../cloudron.js'),
    constants = require('../constants.js'),
    eventlog = require('../eventlog.js'),
    externalLdap = require('../externalldap.js'),
    HttpError = require('connect-lastmile').HttpError,
    HttpSuccess = require('connect-lastmile').HttpSuccess,
    safe = require('safetydance'),
    speakeasy = require('speakeasy'),
    sysinfo = require('../sysinfo.js'),
    system = require('../system.js'),
    tokens = require('../tokens.js'),
    translation = require('../translation.js'),
    updater = require('../updater.js'),
    users = require('../users.js'),
    updateChecker = require('../updatechecker.js');

async function login(req, res, next) {
    assert.strictEqual(typeof req.user, 'object');

    if ('type' in req.body && typeof req.body.type !== 'string') return next(new HttpError(400, 'type must be a string'));

    const type = req.body.type || tokens.ID_WEBADMIN;
    const ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress || null;
    const userAgent = req.headers['user-agent'] || '';
    const auditSource = { authType: 'basic', ip };

    let error = tokens.validateTokenType(type);
    if (error) return next(new HttpError(400, error.message));

    let token;
    [error, token] = await safe(tokens.add({ clientId: type, identifier: req.user.id, expires: Date.now() + constants.DEFAULT_TOKEN_EXPIRATION_MSECS }));
    if (error) return next(new HttpError(500, error));

    eventlog.add(eventlog.ACTION_USER_LOGIN, auditSource, { userId: req.user.id, user: users.removePrivateFields(req.user) });

    await safe(users.notifyLoginLocation(req.user, ip, userAgent, auditSource));

    next(new HttpSuccess(200, token));
}

async function logout(req, res) {
    assert.strictEqual(typeof req.access_token, 'string');

    eventlog.add(eventlog.ACTION_USER_LOGOUT, auditSource.fromRequest(req), { userId: req.user.id, user: users.removePrivateFields(req.user) });

    await safe(tokens.delByAccessToken(req.access_token));
    res.redirect('/login.html');
}

async function passwordResetRequest(req, res, next) {
    if (!req.body.identifier || typeof req.body.identifier !== 'string') return next(new HttpError(401, 'A identifier must be non-empty string'));

    const [error] = await safe(users.sendPasswordResetByIdentifier(req.body.identifier, auditSource.fromRequest(req)));
    if (error && error.reason !== BoxError.NOT_FOUND) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(202, {}));
}

async function passwordReset(req, res, next) {
    assert.strictEqual(typeof req.body, 'object');

    if (typeof req.body.resetToken !== 'string') return next(new HttpError(400, 'Missing resetToken'));
    if (typeof req.body.password !== 'string') return next(new HttpError(400, 'Missing password'));

    let [error, userObject] = await safe(users.getByResetToken(req.body.resetToken));
    if (error) return next(new HttpError(401, 'Invalid resetToken'));
    if (!userObject) return next(new HttpError(401, 'Invalid resetToken'));

    if (userObject.twoFactorAuthenticationEnabled) {
        if (typeof req.body.totpToken !== 'string') return next(new HttpError(401, 'A totpToken must be provided'));

        const verified = speakeasy.totp.verify({ secret: userObject.twoFactorAuthenticationSecret, encoding: 'base32', token: req.body.totpToken, window: 2 });
        if (!verified) return next(new HttpError(401, 'Invalid totpToken'));
    }

    // if you fix the duration here, the emails and UI have to be fixed as well
    if (Date.now() - userObject.resetTokenCreationTime > 7 * 24 * 60 * 60 * 1000) return next(new HttpError(401, 'Token expired'));
    if (!userObject.username) return next(new HttpError(409, 'No username set'));

    // setPassword clears the resetToken
    [error] = await safe(users.setPassword(userObject, req.body.password, auditSource.fromRequest(req)));
    if (error && error.reason === BoxError.BAD_FIELD) return next(new HttpError(400, error.message));
    if (error) return next(BoxError.toHttpError(error));

    let result;
    [error, result] = await safe(tokens.add({ clientId: tokens.ID_WEBADMIN, identifier: userObject.id, expires: Date.now() + constants.DEFAULT_TOKEN_EXPIRATION_MSECS }));
    if (error) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(202, { accessToken: result.accessToken }));
}

async function setupAccount(req, res, next) {
    assert.strictEqual(typeof req.body, 'object');

    if (!req.body.resetToken || typeof req.body.resetToken !== 'string') return next(new HttpError(400, 'resetToken must be a non-empty string'));
    if (!req.body.password || typeof req.body.password !== 'string') return next(new HttpError(400, 'password must be a non-empty string'));

    // only sent if profile is not locked
    if ('username' in req.body && typeof req.body.username !== 'string') return next(new HttpError(400, 'username must be a non-empty string'));
    if ('displayName' in req.body && typeof req.body.displayName !== 'string') return next(new HttpError(400, 'displayName must be a non-empty string'));

    const [error, userObject] = await safe(users.getByResetToken(req.body.resetToken));
    if (error) return next(new HttpError(401, 'Invalid resetToken'));
    if (!userObject) return next(new HttpError(401, 'Invalid resetToken'));

    // if you fix the duration here, the emails and UI have to be fixed as well
    if (Date.now() - userObject.resetTokenCreationTime > 7 * 24 * 60 * 60 * 1000) return next(new HttpError(401, 'Token expired'));

    const [setupAccountError, accessToken] = await safe(users.setupAccount(userObject, req.body, auditSource.fromRequest(req)));
    if (setupAccountError) return next(BoxError.toHttpError(setupAccountError));

    next(new HttpSuccess(201, { accessToken }));
}

async function reboot(req, res, next) {
    // Finish the request, to let the appstore know we triggered the reboot
    next(new HttpSuccess(202, {}));

    await safe(cloudron.reboot());
}

async function isRebootRequired(req, res, next) {
    const [error, rebootRequired] = await safe(cloudron.isRebootRequired());
    if (error) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(200, { rebootRequired }));
}

async function getConfig(req, res, next) {
    const [error, cloudronConfig] = await safe(cloudron.getConfig());
    if (error) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(200, cloudronConfig));
}

function getDisks(req, res, next) {
    system.getDisks(function (error, result) {
        if (error) return next(BoxError.toHttpError(error));

        next(new HttpSuccess(200, result));
    });
}

function getMemory(req, res, next) {
    system.getMemory(function (error, result) {
        if (error) return next(BoxError.toHttpError(error));

        next(new HttpSuccess(200, result));
    });
}

function update(req, res, next) {
    if ('skipBackup' in req.body && typeof req.body.skipBackup !== 'boolean') return next(new HttpError(400, 'skipBackup must be a boolean'));

    // this only initiates the update, progress can be checked via the progress route
    updater.updateToLatest(req.body, auditSource.fromRequest(req), function (error, taskId) {
        if (error && error.reason === BoxError.NOT_FOUND) return next(new HttpError(422, error.message));
        if (error && error.reason === BoxError.BAD_STATE) return next(new HttpError(409, error.message));
        if (error) return next(new HttpError(500, error));

        next(new HttpSuccess(202, { taskId }));
    });
}

function getUpdateInfo(req, res, next) {
    next(new HttpSuccess(200, { update: updateChecker.getUpdateInfo() }));
}

function checkForUpdates(req, res, next) {
    // it can take a while sometimes to get all the app updates one by one
    req.clearTimeout();

    updateChecker.checkForUpdates({ automatic: false }, function () {
        next(new HttpSuccess(200, { update: updateChecker.getUpdateInfo() }));
    });
}

function getLogs(req, res, next) {
    assert.strictEqual(typeof req.params.unit, 'string');

    var lines = 'lines' in req.query ? parseInt(req.query.lines, 10) : 10; // we ignore last-event-id
    if (isNaN(lines)) return next(new HttpError(400, 'lines must be a number'));

    var options = {
        lines: lines,
        follow: false,
        format: req.query.format || 'json'
    };

    cloudron.getLogs(req.params.unit, options, function (error, logStream) {
        if (error) return next(BoxError.toHttpError(error));

        res.writeHead(200, {
            'Content-Type': 'application/x-logs',
            'Content-Disposition': `attachment; filename="${req.params.unit}.log"`,
            'Cache-Control': 'no-cache',
            'X-Accel-Buffering': 'no' // disable nginx buffering
        });
        logStream.pipe(res);
    });
}

function getLogStream(req, res, next) {
    assert.strictEqual(typeof req.params.unit, 'string');

    var lines = 'lines' in req.query ? parseInt(req.query.lines, 10) : 10; // we ignore last-event-id
    if (isNaN(lines)) return next(new HttpError(400, 'lines must be a valid number'));

    function sse(id, data) { return 'id: ' + id + '\ndata: ' + data + '\n\n'; }

    if (req.headers.accept !== 'text/event-stream') return next(new HttpError(400, 'This API call requires EventStream'));

    var options = {
        lines: lines,
        follow: true,
        format: req.query.format || 'json'
    };

    cloudron.getLogs(req.params.unit, options, function (error, logStream) {
        if (error) return next(BoxError.toHttpError(error));

        res.writeHead(200, {
            'Content-Type': 'text/event-stream',
            'Cache-Control': 'no-cache',
            'Connection': 'keep-alive',
            'X-Accel-Buffering': 'no', // disable nginx buffering
            'Access-Control-Allow-Origin': '*'
        });
        res.write('retry: 3000\n');
        res.on('close', logStream.close);
        logStream.on('data', function (data) {
            var obj = JSON.parse(data);
            res.write(sse(obj.monotonicTimestamp, JSON.stringify(obj))); // send timestamp as id
        });
        logStream.on('end', res.end.bind(res));
        logStream.on('error', res.end.bind(res, null));
    });
}

function updateDashboardDomain(req, res, next) {
    if (!req.body.domain || typeof req.body.domain !== 'string') return next(new HttpError(400, 'domain must be a string'));

    cloudron.updateDashboardDomain(req.body.domain, auditSource.fromRequest(req), function (error) {
        if (error) return next(BoxError.toHttpError(error));

        next(new HttpSuccess(204, {}));
    });
}

function prepareDashboardDomain(req, res, next) {
    if (!req.body.domain || typeof req.body.domain !== 'string') return next(new HttpError(400, 'domain must be a string'));

    cloudron.prepareDashboardDomain(req.body.domain, auditSource.fromRequest(req), function (error, taskId) {
        if (error) return next(BoxError.toHttpError(error));

        next(new HttpSuccess(202, { taskId }));
    });
}

async function renewCerts(req, res, next) {
    if ('domain' in req.body && typeof req.body.domain !== 'string') return next(new HttpError(400, 'domain must be a string'));

    const [error, taskId] = await safe(cloudron.renewCerts({ domain: req.body.domain || null }, auditSource.fromRequest(req)));
    if (error) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(202, { taskId }));
}

function syncExternalLdap(req, res, next) {
    externalLdap.startSyncer(function (error, taskId) {
        if (error) return next(new HttpError(500, error.message));

        next(new HttpSuccess(202, { taskId }));
    });
}

function getServerIp(req, res, next) {
    sysinfo.getServerIp(function (error, ip) {
        if (error) return next(BoxError.toHttpError(error));

        next(new HttpSuccess(200, { ip }));
    });
}

function getLanguages(req, res, next) {
    translation.getLanguages(function (error, languages) {
        if (error) return next(new BoxError.toHttpError(error));

        next(new HttpSuccess(200, { languages }));
    });
}

async function syncDnsRecords(req, res, next) {
    assert.strictEqual(typeof req.body, 'object');

    if ('domain' in req.body && typeof req.body.domain !== 'string') return next(new HttpError(400, 'domain must be a string'));
    if ('type' in req.body && typeof req.body.type !== 'string') return next(new HttpError(400, 'type must be a string'));

    const [error, taskId] = await safe(cloudron.syncDnsRecords(req.body));
    if (error && error.reason === BoxError.ACCESS_DENIED) return next(new HttpSuccess(200, { error: { reason: error.reason, message: error.message }}));
    if (error) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(201, { taskId }));
}