/*******************************
          Update Repos
*******************************/

/*

 This task update all SUI individual distribution repos with new versions of distributions

  * Commits changes from create repo
  * Pushes changes to GitHub
  * Tag new releases if version changed in main repo

*/

const
    gulp           = require('gulp'),

    // node dependencies
    console        = require('better-console'),
    fs             = require('fs'),
    path           = require('path'),
    git            = require('gulp-git'),

    // admin files
    release        = require('../../config/admin/release'),
    project        = require('../../config/project/release'),

    // oAuth configuration for GitHub
    oAuth          = fs.existsSync(path.join(__dirname, '/../../config/admin/oauth.js'))
        ? require('../../config/admin/oauth.js') // eslint-disable-line import/extensions
        : false,

    // shorthand
    version = project.version
;

module.exports = function (callback) {
    const github = require('../../config/admin/github'); // eslint-disable-line global-require

    let
        index = -1,
        total = release.distributions.length,
        timer,
        stream,
        stepRepo
    ;

    if (!oAuth) {
        console.error('Must add oauth token for GitHub in tasks/config/admin/oauth.js');

        return;
    }

    // Do Git commands synchronously per distribution, to avoid issues
    stepRepo = function () {
        index += 1;
        if (index >= total) {
            callback();

            return;
        }

        let
            distribution         = release.distributions[index],
            outputDirectory      = path.resolve(path.join(release.outputRoot, distribution.toLowerCase())),
            repoName             = release.distRepoRoot + distribution,

            commitArgs = oAuth.name !== undefined && oAuth.email !== undefined
                ? '--author "' + oAuth.name + ' <' + oAuth.email + '>"'
                : '',

            distributionPackage = fs.existsSync(outputDirectory + 'package.json')
                ? require(outputDirectory + 'package.json') // eslint-disable-line global-require, import/no-dynamic-require
                : false,

            isNewVersion  = version && distributionPackage.version !== version,

            commitMessage = isNewVersion
                ? 'Updated distribution to version ' + version
                : 'Updated files from main repo',

            gitOptions      = { cwd: outputDirectory },
            commitOptions   = { args: commitArgs, cwd: outputDirectory },
            releaseOptions  = { tag_name: version, owner: release.org, repo: repoName },

            fileModeOptions = { args: 'config core.fileMode false', cwd: outputDirectory },
            usernameOptions = { args: 'config user.name "' + oAuth.name + '"', cwd: outputDirectory },
            emailOptions    = { args: 'config user.email "' + oAuth.email + '"', cwd: outputDirectory },
            versionOptions =  { args: 'rev-parse --verify HEAD', cwd: outputDirectory },

            localRepoSetup  = fs.existsSync(path.join(outputDirectory, '.git')),
            canProceed      = true
        ;

        console.info('Processing repository:' + outputDirectory);

        function setConfig() {
            git.exec(fileModeOptions, function () {
                git.exec(usernameOptions, function () {
                    git.exec(emailOptions, function () {
                        commitFiles();
                    });
                });
            });
        }

        // standard path
        function commitFiles() {
            // commit files
            console.info('Committing ' + distribution + ' files', commitArgs);
            gulp.src('./', gitOptions)
                .pipe(git.add(gitOptions))
                .pipe(git.commit(commitMessage, commitOptions))
                .on('error', function (error) {
                    // canProceed = false; bug in git commit <https://github.com/stevelacy/gulp-git/issues/49>
                })
                .on('finish', function (callback) {
                    if (canProceed) {
                        pushFiles();
                    } else {
                        console.info('Nothing new to commit');
                        nextRepo();
                    }
                })
            ;
        }

        // push changes to remote
        function pushFiles() {
            console.info('Pushing files for ' + distribution);
            git.push('origin', 'master', { args: '', cwd: outputDirectory }, function (error) {
                console.info('Push completed successfully');
                getSHA();
            });
        }

        // gets SHA of last commit
        function getSHA() {
            git.exec(versionOptions, function (error, version) {
                version = version.trim();
                createRelease(version);
            });
        }

        // create release on GitHub.com
        function createRelease(version) {
            if (version) {
                releaseOptions.target_commitish = version;
            }
            github.repos.createRelease(releaseOptions, function () {
                nextRepo();
            });
        }

        // Steps to next repository
        function nextRepo() {
            console.log('Sleeping for 1 second...');
            // avoid rate throttling
            global.clearTimeout(timer);
            timer = global.setTimeout(stepRepo, 100);
        }

        if (localRepoSetup) {
            setConfig();
        } else {
            console.error('Repository must be setup before running update distributions');
        }
    };

    stepRepo();
};