module.exports = function(grunt) {
  require('time-grunt')(grunt);

  let _ = require('lodash-compat');
  let pkg = grunt.file.readJSON('package.json');
  let license = grunt.file.read('build/license-header.txt');
  let bannerCommonData = _.pick(pkg, ['version', 'copyright']);
  let verParts = pkg.version.split('.');
  let version = {
    full: pkg.version,
    major: verParts[0],
    minor: verParts[1],
    patch: verParts[2]
  };

  /**
   * Creates processor functions for license banners.
   *
   * @private
   * @param  {Object} data Custom data overriding `bannerCommonData`. Will
   *                       not be mutated.
   * @return {Function}    A function which returns a processed grunt template
   *                       using an object constructed from `bannerCommonData`
   *                       and the `data` argument.
   */
  let createLicenseProcessor = (data) => function () {
    return grunt.template.process(license, {
      data: _.merge({}, bannerCommonData, data)
    });
  };

  version.majorMinor = `${version.major}.${version.minor}`;
  grunt.vjsVersion = version;

  // Project configuration.
  grunt.initConfig({
    pkg,
    clean: {
      build: ['build/temp/*'],
      dist: ['dist/*']
    },
    jshint: {
      src: {
        src: ['src/js/**/*.js', 'Gruntfile.js', 'test/unit/**/*.js'],
        options: {
          jshintrc: '.jshintrc'
        }
      }
    },
    uglify: {
      options: {
        sourceMap: true,
        sourceMapIn: 'build/temp/video.js.map',
        sourceMapRoot: '../../src/js',
        preserveComments: 'some',
        mangle: true,
        compress: {
          sequences: true,
          dead_code: true,
          conditionals: true,
          booleans: true,
          unused: true,
          if_return: true,
          join_vars: true,
          drop_console: true
        }
      },
      build: {
        files: {
          'build/temp/alt/video.novtt.min.js': 'build/temp/alt/video.novtt.js',
          'build/temp/video.min.js': 'build/temp/video.js'
        }
      }
    },
    dist: {},
    watch: {
      jshint: {
        files: ['src/**/*', 'test/unit/**/*.js', 'Gruntfile.js'],
        tasks: 'jshint'
      },
      skin: {
        files: ['src/css/**/*'],
        tasks: 'sass'
      }
    },
    connect: {
      dev: {
        options: {
          port: Number(process.env.VJS_CONNECT_PORT) || 9999,
          livereload: true,
          useAvailablePort: true
        }
      }
    },
    copy: {
      minor: {
        files: [
          {expand: true, cwd: 'build/temp/', src: ['*'], dest: 'dist/'+version.majorMinor+'/', filter: 'isFile'} // includes files in path
        ]
      },
      patch: {
        files: [
          {expand: true, cwd: 'build/temp/', src: ['*'], dest: 'dist/'+version.full+'/', filter: 'isFile'} // includes files in path
        ]
      },
      fonts: { cwd: 'node_modules/videojs-font/fonts/', src: ['*'], dest: 'build/temp/font/', expand: true, filter: 'isFile' },
      swf:   { cwd: 'node_modules/videojs-swf/dist/', src: 'video-js.swf', dest: 'build/temp/', expand: true, filter: 'isFile' },
      ie8:   { cwd: 'node_modules/videojs-ie8/dist/', src: ['**/**'], dest: 'build/temp/ie8/', expand: true, filter: 'isFile' },
      novtt: { cwd: 'build/temp/', src: 'video.novtt.js', dest: 'build/temp/alt/', expand: true, filter: 'isFile' },
      dist:  { cwd: 'build/temp/', src: ['**/**', '!test*'], dest: 'dist/', expand: true, filter: 'isFile' },
      examples: { cwd: 'docs/examples/', src: ['**/**'], dest: 'dist/examples/', expand: true, filter: 'isFile' }
    },
    cssmin: {
      minify: {
        expand: true,
        cwd: 'build/temp/',
        src: ['video-js.css'],
        dest: 'build/temp/',
        ext: '.min.css'
      }
    },
    sass: {
      build: {
        files: {
          'build/temp/video-js.css': 'src/css/video-js.scss'
        }
      }
    },
    karma: {
      // this config file applies to all following configs except if overwritten
      options: {
        configFile: 'test/karma.conf.js'
      },

      defaults: {},

      watch: {
        autoWatch: true,
        singleRun: false
      },

      // these are run locally on local browsers
      dev: { browsers: ['Chrome', 'Firefox', 'Safari'] },
      chromecanary: { browsers: ['ChromeCanary'] },
      chrome:       { browsers: ['Chrome'] },
      firefox:      { browsers: ['Firefox'] },
      safari:       { browsers: ['Safari'] },
      ie:           { browsers: ['IE'] },
      phantomjs:    { browsers: ['PhantomJS'] },

      // this only runs on PRs from the mainrepo on saucelabs
      saucelabs:  { browsers: ['chrome_sl'] },
      chrome_sl:  { browsers: ['chrome_sl'] },
      firefox_sl: { browsers: ['firefox_sl'] },
      safari_sl:  { browsers: ['safari_sl'] },
      ipad_sl:    { browsers: ['ipad_sl'] },
      android_sl: { browsers: ['android_sl'] },
      ie_sl:      { browsers: ['ie_sl'] }
    },
    vjsdocs: {
      all: {
        // TODO: Update vjsdocs to support new build, or switch to jsdoc
        src: '',
        dest: 'docs/api',
        options: {
          baseURL: 'https://github.com/videojs/video.js/blob/master/'
        }
      }
    },
    vjslanguages: {
      defaults: {
        files: {
          'build/temp/lang': ['lang/*.json']
        }
      }
    },
    zip: {
      dist: {
        router: function (filepath) {
          var path = require('path');
          return path.relative('dist', filepath);
        },
        // compression: 'DEFLATE',
        src: ['dist/**/*'],
        dest: 'dist/video-js-' + version.full + '.zip'
      }
    },
    version: {
      options: {
        pkg: 'package.json'
      },
      major: {
        options: {
          release: 'major'
        },
        src: ['package.json', 'component.json']
      },
      minor: {
        options: {
          release: 'minor'
        },
        src: ['package.json', 'component.json']
      },
      patch: {
        options: {
          release: 'patch'
        },
        src: ['package.json', 'component.json']
      },
      prerelease: {
        options: {
          release: 'prerelease'
        },
        src: ['package.json', 'component.json']
      },
      css: {
        options: {
          prefix: '@version\\s*'
        },
        src: 'build/temp/video-js.css'
      }
    },
    'github-release': {
      options: {
        repository: 'videojs/video.js',
        auth: {
          user: process.env.VJS_GITHUB_USER,
          password: process.env.VJS_GITHUB_TOKEN
        },
        release: {
          tag_name: 'v'+ version.full,
          name: version.full,
          body: require('chg').find(version.full).changesRaw
        }
      },
      files: {
        src: [`dist/video-js-${version.full}.zip`] // Files that you want to attach to Release
      }
    },
    browserify: {
      options: {
        browserifyOptions: {
          debug: true,
          standalone: 'videojs'
        },
        plugin: [
          ['browserify-derequire']
        ],
        transform: [
          require('babelify').configure({
            sourceMapRelative: './',
            loose: ['all']
          }),
          ['browserify-versionify', {
            placeholder: '__VERSION__',
            version: pkg.version
          }],
          ['browserify-versionify', {
            placeholder: '__VERSION_NO_PATCH__',
            version: version.majorMinor
          }]
        ]
      },
      build: {
        files: {
          'build/temp/video.js': ['src/js/video.js']
        }
      },
      watch: {
        options: {
          watch: true,
          keepAlive: true
        },
        files: {
          'build/temp/video.js': ['src/js/video.js']
        }
      },
      tests: {
        options: {
          browserifyOptions: {
            debug: true,
            standalone: false
          },
          banner: false,
          watch: true,
          keepAlive: true
        },
        files: {
          'build/temp/tests.js': [
            'test/globals-shim.js',
            'test/unit/**/*.js'
          ]
        }
      }
    },
    exorcise: {
      build: {
        options: {},
        files: {
          'build/temp/video.js.map': ['build/temp/video.js'],
        }
      }
    },
    coveralls: {
      options: {
        // warn instead of failing when coveralls errors
        // we've seen coveralls 503 relatively frequently
        force: true
      },
      all: {
        src: 'test/coverage/lcov.info'
      }
    },
    concat: {
      novtt: {
        options: {
          separator: '\n'
        },
        src: ['build/temp/video.js'],
        dest: 'build/temp/video.novtt.js'
      },
      vtt: {
        options: {
          separator: '\n',
        },
        src: ['build/temp/video.js', 'node_modules/vtt.js/dist/vtt.js'],
        dest: 'build/temp/video.js',
      },
    },
    concurrent: {
      options: {
        logConcurrentOutput: true
      },
      // Run multiple watch tasks in parallel
      // Needed so watchify can cache intelligently
      watchAll: [
        'watch',
        'browserify:watch',
        'browserify:tests',
        'karma:watch'
      ],
      watchSandbox: [
        'watch',
        'browserify:watch'
      ]
    },
    usebanner: {
      novtt: {
        options: {
          process: createLicenseProcessor({includesVtt: false})
        },
        files: {
          src: ['build/temp/alt/video.novtt.js']
        }
      },
      vtt: {
        options: {
          process: createLicenseProcessor({includesVtt: true})
        },
        files: {
          src: ['build/temp/video.js']
        }
      }
    }
  });

  // load all the npm grunt tasks
  require('load-grunt-tasks')(grunt);
  grunt.loadNpmTasks('videojs-doc-generator');
  grunt.loadNpmTasks('chg');

  grunt.registerTask('build', [
    'clean:build',

    'jshint',
    'browserify:build',
    'exorcise:build',
    'concat:novtt',
    'concat:vtt',
    'copy:novtt',
    'usebanner:novtt',
    'usebanner:vtt',
    'uglify',

    'sass',
    'version:css',
    'cssmin',

    'copy:fonts',
    'copy:swf',
    'copy:ie8',
    'vjslanguages'
  ]);

  grunt.registerTask('dist', [
    'clean:dist',
    'build',
    'copy:dist',
    'copy:examples',
    'zip:dist'
  ]);

  // Default task - build and test
  grunt.registerTask('default', ['test']);

  grunt.registerTask('test', ['build', 'karma:defaults']);

  // Run while developing
  grunt.registerTask('dev', ['build', 'connect:dev', 'concurrent:watchSandbox']);

  grunt.registerTask('watchAll', ['build', 'connect:dev', 'concurrent:watchAll']);

  // Pick your testing, or run both in different terminals
  grunt.registerTask('test-ui', ['browserify:tests']);
  grunt.registerTask('test-cli', ['karma:watch']);

  // Load all the tasks in the tasks directory
  grunt.loadTasks('build/tasks');
};