/* jslint node:true */

'use strict';

require('./src/logger.js')();
require('supererror')({ splatchError: true });

var async = require('async'),
    debug = require('debug')('e2e:runner'),
    fs = require('fs'),
    path = require('path'),
    shell = require('./shell.js'),
    semver = require('semver'),
    mailer = require('./mailer.js'),
    superagent = require('superagent'),
    util = require('util');

var E2E_TEST_DIR = path.join(process.env.HOME, 'e2e-test');
var INSTALLER_DIR = path.join(process.env.HOME, 'installer');

// override debug.log to print only as console.log
debug.log = console.log.bind(console);

var gLatestETag = null; // this allows us to rerun tests by restarting this process. and also for every appstore push
var gLatestBoxVersion  = null; // for sending mail

function start() {
    runTestsIfNeeded(function () {
        setTimeout(start, 60 * 1000);
    });
}

function runTestsIfNeeded(callback) {
    debug('Getting latest box version');

    getLatestBoxVersion(function (error, latestETag, latestBoxVersion) {
        if (error) return callback(error);

        if (latestETag === gLatestETag) {
            debug('Box version has not changed. etag %s', gLatestETag);
            return callback(null);
        }

        debug('Box version has changed. etag %s', latestETag);

        runTests(latestETag, latestBoxVersion, function (error) {
            debug('Finished running tests for etag %s: %s', latestETag, error);
            gLatestETag = latestETag;
            gLatestBoxVersion = latestBoxVersion;
            callback(error);
        });
    });
}

function getLatestBoxVersion(callback) {
    superagent.get(process.env.BOX_VERSIONS_URL).end(function (error, res) {
        if (error || res.statusCode !== 200 || !res.body) {
            debug('Error downloading versions file', error, res.statusCode);
            return callback(new Error('Error downloading versions file'));
        }

        var latestVersion = Object.keys(res.body).sort(semver.rcompare)[0];
        var latestETag = res.headers['etag'];

        debug('%j:', res.headers);

        callback(null, latestETag, latestVersion);
    });
}

function gitPullLatestTests(callback) {
    async.series([
        function (next) {
            if (fs.existsSync(E2E_TEST_DIR)) return next();
            debug('Cloning e2e-test repo on first run');
            shell.system('gitCloneE2E', 'git clone ' + process.env.E2E_TEST_REPO + ' e2e-test',
                       { cwd: process.env.HOME }, next);
        },
        function (next) {
            if (fs.existsSync(INSTALLER_DIR)) return next();
            debug('Cloning install repo on first run');
            shell.system('gitCloneInstaller', 'git clone ' + process.env.INSTALLER_REPO + ' installer',
                       { cwd: process.env.HOME }, next);
        },
        function (next) {
            debug('getting latest e2e-test');
            shell.system('gitFetchE2E', 'git fetch origin && git reset --hard origin/master && npm install',
                   { cwd: E2E_TEST_DIR, env: { GIT_DIR: E2E_TEST_DIR + '/.git' }  }, next); // it's not clear why GIT_DIR is needed
        },
        function (next) {
            debug('getting latest installer');
            shell.system('gitFetchInstaller', 'git fetch origin && git reset --hard origin/master && npm install',
                   { cwd: INSTALLER_DIR, env: { GIT_DIR: INSTALLER_DIR + '/.git' }  }, next); // it's not clear why GIT_DIR is needed
        }
    ], callback);
}

function runTests(latestETag, latestBoxVersion, callback) {
    var topic = util.format('box version: %s etag: %s', latestBoxVersion, latestETag);

    debug('Running tests for %s', topic);

    gitPullLatestTests(function (error, stdout, stderr) {
        if (error) {
            mailer.sendEndToEndTestResult(topic, stdout ? stdout.toString('utf8') : '', stderr ? stderr.toString('utf8') : '', function () { });
            return callback(error);
        }

        shell.system('e2etestrunner', 'npm test', { cwd: E2E_TEST_DIR }, function (error, stdout, stderr) {
            debug('Final test result', error);

            mailer.sendEndToEndTestResult(topic, stdout ? stdout.toString('utf8') : '', stderr ? stderr.toString('utf8') : '', function () { });
            return callback(error);
        });
    });
}

debug('e2etest started.');
start();