module.exports = function (grunt) {

    var embedOption = grunt.option('embed_languages'),
        embedLanguageDest = embedOption ?
            'min/moment-with-customlangs.js' :
            'min/moment-with-langs.js',
        embedLanguageLangs = 'lang/*.js';

    if (embedOption && embedOption.match(/,/)) {
        embedLanguageLangs = 'lang/{' + embedOption + '}.js';
    }
    else if (embedOption) {
        embedLanguageLangs = 'lang/' + embedOption + '.js';
    }

    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        concat: {
            langs: {
                src: 'lang/*.js',
                dest: 'min/langs.js'
            }
        },
        uglify: {
            target: {
                files: {
                    'min/moment-with-langs.min.js': 'min/moment-with-langs.js',
                    'min/moment-with-customlangs.min.js': 'min/moment-with-customlangs.js',
                    'min/langs.min.js': 'min/langs.js',
                    'min/moment.min.js': 'moment.js'
                }
            },
            options: {
                mangle: true,
                compress: {
                    dead_code: false
                },
                output: {
                    ascii_only: true
                },
                report: 'min',
                preserveComments: 'some'
            }
        },
        nodeunit: {
            all: ["test/**/*.js"]
        },
        jshint: {
            all: ["Gruntfile.js", "moment.js", "lang/**/*.js", "test/**/*.js"],
            options: {
                "node": true,
                "browser": true,
                "boss": false,
                "curly": true,
                "debug": false,
                "devel": false,
                "eqeqeq": true,
                "eqnull": true,
                "evil": false,
                "forin": false,
                "immed": false,
                "laxbreak": false,
                "newcap": true,
                "noarg": true,
                "noempty": false,
                "nonew": false,
                "onevar": true,
                "plusplus": false,
                "regexp": false,
                "undef": true,
                "sub": true,
                "strict": false,
                "white": true,
                "globals": {
                    "define": false
                }
            }
        },
        watch: {
            test: {
                files: [
                    'moment.js',
                    'lang/*.js',
                    'test/**/*.js'
                ],
                tasks: ['nodeunit']
            },
            jshint: {
                files: '<%= jshint.all %>',
                tasks: ['jshint']
            }
        },
        embed_languages: {
            moment: 'moment.js',
            dest: embedLanguageDest,
            targetLangs: embedLanguageLangs
        }
    });

    grunt.loadTasks("tasks");

    // These plugins provide necessary tasks.
    grunt.loadNpmTasks('grunt-contrib-nodeunit');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-contrib-concat');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-watch');

    // Default task.
    grunt.registerTask('default', ['jshint', 'nodeunit']);
    grunt.registerTask('test', ['nodeunit']);

    // Task to be run when releasing a new version
    grunt.registerTask('release', ['jshint', 'nodeunit', 'concat',
        'embed_languages', 'component', 'uglify']);
};