/* jslint node:true */

'use strict';

require('supererror')({ splatchError: true });

var debug = require('debug')('e2e:runner'),
    shell = require('./shell.js'),
    semver = require('semver'),
    mailer = require('./mailer.js'),
    superagent = require('superagent'),
    terminate = require('terminate'),
    util = require('util'),
    _ = require('underscore');

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

var gLatestVersionInfo = null; // do not use etag since it only hashes body. do not use s3 filestamp since the upgrade test modifies it....
var gNpmTest = null;

function cleanExit() {
    if (gNpmTest) {
        debug('Terminating child test process %s', gNpmTest.pid);
        terminate(gNpmTest.pid, process.exit);
        gNpmTest = null;
    } else {
        debug('No child test process to terminate');
        process.exit();
    }
}

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

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

    getLatestBoxVersion(function (error, latestVersionInfo) {
        if (error) return callback(error);

        if (_.isEqual(gLatestVersionInfo, latestVersionInfo)) {
            debug('Box version has not changed');
            return callback();
        }

        debug('Box version has changed. latestVersionInfo:%j', latestVersionInfo);

        var diff = (new Date() - new Date(latestVersionInfo.date));
        if (diff < 3 * 60 * 1000) { // give appstore 3 mins
            debug('Waiting for appstore gets the new release. diff=%s', diff);
            return callback();
        }

        runTests(latestVersionInfo, function (error) {
            debug('Finished running tests for %j %s', latestVersionInfo, error);
            gLatestVersionInfo = latestVersionInfo;
            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 latestVersionInfo = Object.keys(res.body).sort(semver.rcompare)[0];

        var result = _.extend({ }, res.body[latestVersionInfo]);
        result.version = latestVersionInfo;

        callback(null, result);
    });
}

function runTests(latestVersionInfo, callback) {
    debug('Running tests for %j', latestVersionInfo);

    gNpmTest = shell.system('e2etestrunner', 'npm run-script parallel_test', { env: { BOX_VERSION: latestVersionInfo.version } }, function (error, stdout, stderr) {
        gNpmTest = null;
        debug('Final test result', error);

        var topic = util.format('E2E Test %s for box version: %s', error ? 'failed': 'passed', latestVersionInfo.version);

        mailer.sendEndToEndTestResult(topic, JSON.stringify(latestVersionInfo, null, 4), stdout ? stdout.toString('utf8') : '', stderr ? stderr.toString('utf8') : '', function () { });
        return callback(error);
    });
}

debug('e2etest started.');

process.on('exit', cleanExit);
process.on('SIGINT', cleanExit); // catch ctrl-c
process.on('SIGTERM', cleanExit); // catch kill
process.on('uncaughtException', cleanExit);

start();