module.exports = function(grunt) {

    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),

        concat: {
            dist: {
                src: [
                    'dev/js/libs/*.js',
                    'dev/js/script.js'
                ],
                dest: 'dev/js/main.js'
            }
        },

        uglify: {
            build: {
                src: 'dev/js/main.js',
                dest: 'assets/script.js'
            }
        },

        imagemin: {
            dynamic: {
                files: [{
                    expand: true,
                    cwd: 'image/',
                    src: ['**/*.{png,jpg,gif}'],
                    dest: 'image/'
                }]
            }
        },

        sass: {
            dist: {
                options: {
                    style: 'expanded'
                },
                files: {
                    'dev/css/style.css': 'dev/sass/style.sass'
                }
            }
        },

        autoprefixer: {
            options: {
                browsers: ['last 2 versions']
            },
            multiple_files: {
                expand: true,
                flatten: true,
                src: 'dev/css/style.css',
                dest: 'dev/css/prefixed/'
            }
        },

        cssmin: {
            combine: {
                files: {
                    'assets/style.css': 'dev/css/prefixed/style.css'
                }
            }
        },

        htmlmin: {
            dist: {
                options: {
                    removeComments: true,
                    collapseWhitespace: true
                },
                files: {
                    'index.html': 'dev/index.html'
                }
            }
        },

        compress: {
            main: {
                options: {
                    mode: 'gzip'
                },
                expand: true,
                cwd: 'assets/',
                src: ['**/*'],
                dest: 'assets/'
            }
        },

        watch: {
            options: {
                livereload: true,
            },
            scripts: {
                files: ['dev/js/*.js'],
                tasks: ['concat', 'uglify'],
                options: {
                    spawn: false
                }
            },
            images: {
                files: ['image/**/*.{png,jpg,gif}', 'image/*.{png,jpg,gif}'],
                tasks: ['imagemin'],
                options: {
                    spawn: false
                }
            },
            css: {
                files: ['dev/sass/*.sass'],
                tasks: ['sass', 'autoprefixer', 'cssmin'],
                options: {
                    spawn: false
                }
            },
            html: {
                files: ['dev/*.html'],
                tasks: ['htmlmin'],
                options: {
                    spawn: false
                }
            }
        },

        connect: {
            server: {
                options: {
                    port: 8000,
                    base: './'
                }
            }
        }
    });

    require('load-grunt-tasks')(grunt);

    grunt.registerTask('default', ['concat', 'uglify', 'imagemin', 'sass', 'autoprefixer', 'cssmin',  'htmlmin', 'compress']);

    grunt.registerTask('dev', ['concat', 'uglify', 'imagemin', 'sass', 'autoprefixer', 'cssmin',  'htmlmin', 'compress', 'connect', 'watch']);
};