Grunt with sass

module.exports = function(grunt) {
    
    // https://www.sitepoint.com/writing-awesome-build-script-grunt/
    // http://paislee.io/testing-angularjs-with-grunt-karma-and-jasmine/
    grunt.loadNpmTasks('grunt-karma');
    
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),

        clean: {
            build: {
                src: ['build']
            },
            stylesheets: {
                src: ['build/**/*.css', '!build/application.css']
            },
            scripts: {
                src: ['build/**/*.js', '!build/application.min.js']
            },
        },

        karma: {
            unit: {
                options: {
                    frameworks: ['jasmine'],
                    singleRun: true,
                    browsers: ['PhantomJS'],
                    //files: ['public/components/angular/angular.js', 'public/components/angular-mocks/angular-mocks.js', 'src/js/**/*.js']
                    files: ['test/**/*.js']
                }
            }
        },

        uglify: {
            build: {
                options: {
                    mangle: true
                },
                files: {
                    'build/application.min.js': ['build/**/*.js']
                }
            }
        },

        qunit: {
            files: ['test/**/*.html']
        },

        jshint: {
            files: ['Gruntfile.js', 'src/**/*.js', 'test/**/*.js'],
            options: {
                // options here to override JSHint defaults
                globals: {
                    jQuery: true,
                    console: true,
                    module: true,
                    document: true
                }
            }
        },

        copy: {
            build: {
                cwd: '.',
                src: ['css/*.css', 'fonts/**/*', 'webfonts/**/*', 'images/**/*', 'javascript/**/*.js'],
                dest: 'build',
                expand: true
            },
        },

        watch: {
            stylesheets: {
                files: 'scss/**/*.scss',
                tasks: ['stylesheets']
            },
            scripts: {
                files: 'javascript/**/*.js',
                tasks: ['scripts']
            },
            copy: {
                files: ['css/*.css', '!scss/**/*.scss'],
                tasks: ['copy']
            }
        },    

        sass: {
            build: {
                files: [{
                    expand: true,
                    cwd: 'scss',
                    src: ['*.scss'],
                    dest: 'build/css',
                    ext: '.css'
                }]
            }
        },

        css: {
            files: ['scss/*.scss'],
            tasks: ['stylesheets']
        },

        cssmin: {
            build: {
                options: {
                    restructuring: false
                },                
                files: {
                    'build/application.css': [ 'build/css/**/*.css' ]
                }
            }
        },        

        autoprefixer: {
            build: {
                expand: true,
                cwd: 'build',
                src: ['css/*.css'],
                dest: 'build'
            }
        } 

    });
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-autoprefixer');
    grunt.loadNpmTasks('grunt-contrib-cssmin');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-contrib-qunit');
    grunt.loadNpmTasks('grunt-contrib-less');
    grunt.loadNpmTasks('grunt-contrib-sass');
    grunt.loadNpmTasks('grunt-contrib-watch');
    //grunt.registerTask('test', ['jshint', 'qunit']);

    grunt.registerTask(
        'stylesheets', 
        'Compiles the stylesheets.', 
        ['sass', 'cssmin', 'clean:stylesheets']
    );

    grunt.registerTask(
        'scripts', 
        'Compiles the JavaScript files.', 
        ['uglify', 'clean:scripts']
    );    

    grunt.registerTask(
        'build', 
        'Compiles all of the assets and copies the files to the build directory.', 
        ['clean:build', 'copy', 'stylesheets', 'scripts']
    );

    grunt.registerTask('test', ['jshint', 'karma']);

    grunt.registerTask(
        'default', 
        'Watches the project for changes, automatically builds them and runs a server.', 
        ['build', 'watch']
    );    
};