/* global module:false */
module.exports = function (grunt) {
  var port = grunt.option('port') || 8000;
  var root = grunt.option('root') || '.';

  if (!Array.isArray(root)) root = [root];

  // Project configuration
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    meta: {
      banner:
        '/*!\n' +
        ' * reveal.js <%= pkg.version %> (<%= grunt.template.today("yyyy-mm-dd, HH:MM") %>)\n' +
        ' * http://revealjs.com\n' +
        ' * MIT licensed\n' +
        ' *\n' +
        ' * Copyright (C) 2018 Hakim El Hattab, http://hakim.se\n' +
        ' */'
    },

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

    uglify: {
      options: {
        banner: '<%= meta.banner %>\n',
        ie8: true
      },
      build: {
        src: 'js/reveal.js',
        dest: 'js/reveal.min.js'
      }
    },

    sass: {
      core: {
        src: 'css/reveal.scss',
        dest: 'css/reveal.css'
      },
      themes: {
        expand: true,
        cwd: 'css/theme/source',
        src: ['*.sass', '*.scss'],
        dest: 'css/theme',
        ext: '.css'
      }
    },

    autoprefixer: {
      core: {
        src: 'css/reveal.css'
      }
    },

    cssmin: {
      options: {
        compatibility: 'ie9'
      },
      compress: {
        src: 'css/reveal.css',
        dest: 'css/reveal.min.css'
      }
    },

    jshint: {
      options: {
        curly: false,
        eqeqeq: true,
        immed: true,
        esnext: true,
        latedef: 'nofunc',
        newcap: true,
        noarg: true,
        sub: true,
        undef: true,
        eqnull: true,
        browser: true,
        expr: true,
        loopfunc: true,
        globals: {
          head: false,
          module: false,
          console: false,
          unescape: false,
          define: false,
          exports: false
        }
      },
      files: ['Gruntfile.js', 'js/reveal.js']
    },

    connect: {
      server: {
        options: {
          port: port,
          base: root,
          livereload: true,
          open: true,
          useAvailablePort: true
        }
      }
    },

    zip: {
      bundle: {
        src: [
          'index.html',
          'css/**',
          'js/**',
          'lib/**',
          'images/**',
          'plugin/**',
          '**.md'
        ],
        dest: 'reveal-js-presentation.zip'
      }
    },

    watch: {
      js: {
        files: ['Gruntfile.js', 'js/reveal.js'],
        tasks: 'js'
      },
      theme: {
        files: [
          'css/theme/source/*.sass',
          'css/theme/source/*.scss',
          'css/theme/template/*.sass',
          'css/theme/template/*.scss'
        ],
        tasks: 'css-themes'
      },
      css: {
        files: ['css/reveal.scss'],
        tasks: 'css-core'
      },
      html: {
        files: root.map(path => path + '/*.html')
      },
      markdown: {
        files: root.map(path => path + '/*.md')
      },
      options: {
        livereload: true
      }
    },

    retire: {
      js: ['js/reveal.js', 'lib/js/*.js', 'plugin/**/*.js'],
      node: ['.']
    }

  });

  // Dependencies
  grunt.loadNpmTasks('grunt-contrib-connect');
  grunt.loadNpmTasks('grunt-contrib-cssmin');
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-qunit');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-autoprefixer');
  grunt.loadNpmTasks('grunt-retire');
  grunt.loadNpmTasks('grunt-sass');
  grunt.loadNpmTasks('grunt-zip');

  // Default task
  grunt.registerTask('default', ['css', 'js']);

  // JS task
  grunt.registerTask('js', ['jshint', 'uglify', 'qunit']);

  // Theme CSS
  grunt.registerTask('css-themes', ['sass:themes']);

  // Core framework CSS
  grunt.registerTask('css-core', ['sass:core', 'autoprefixer', 'cssmin']);

  // All CSS
  grunt.registerTask('css', ['sass', 'autoprefixer', 'cssmin']);

  // Package presentation to archive
  grunt.registerTask('package', ['default', 'zip']);

  // Serve presentation locally
  grunt.registerTask('serve', ['connect', 'watch']);

  // Run tests
  grunt.registerTask('test', ['jshint', 'qunit']);

};