var lrSnippet = require('connect-livereload')();
var mountFolder = function (connect, dir) {
    return connect.static(require('path').resolve(dir));
};

/*global module:false*/
module.exports = function (grunt) {
  require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

  /**
   * Load in our build configuration file.
   */
  var userConfig = require( './build.config.js' );

  // Project configuration.
  var taskConfig = {
    // Metadata.
    pkg: grunt.file.readJSON('package.json'),
    meta: {
        banner: '/*! <%= pkg.title || pkg.name %> - v<%= pkg.version %> - ' +
          '<%= grunt.template.today("yyyy-mm-dd") %>\n' +
          '<%= pkg.homepage ? "* " + pkg.homepage + "\\n" : "" %>' +
          '* Copyright (c) <%= grunt.template.today("yyyy") %> <%= pkg.author.name %>;' +
          ' Licensed <%= _.pluck(pkg.licenses, "type").join(", ") %> */\n',
    },
    clean: [
      '<%= build_dir %>',
      '<%= compile_dir %>'
    ],
    copy: {
      build_app_assets: {
        files: [
          {
            src: [ '**' ],
            dest: '<%= build_dir %>/assets/',
            cwd: 'src/assets',
            expand: true
          }
        ]
      },
      build_vendor_assets: {
        files: [
          {
            src: [ '<%= vendor_files.assets %>' ],
            dest: '<%= build_dir %>/assets/',
            cwd: '.',
            expand: true,
            flatten: true
          }
       ]
      },
      build_appjs: {
        files: [
          {
            src: [ '<%= app_files.js %>' ],
            dest: '<%= build_dir %>/',
            cwd: '.',
            expand: true
          }
        ]
      },
      build_vendorjs: {
        files: [
          {
            src: [ '<%= vendor_files.js %>' ],
            dest: '<%= build_dir %>/',
            cwd: '.',
            expand: true
          }
        ]
      },
      build_vendorcss: {
        files: [
          {
            src: [ '<%= vendor_files.css %>' ],
            dest: '<%= build_dir %>',
            cwd: '.',
            expand: true
          }
        ]
      },
      build_vendorassets: {
        files: [
          {
            src: [ '<%= vendor_files.assets %>' ],
            dest: '<%= build_dir %>',
            cwd: '.',
            expand: true
          }
        ]
      },
      compile_assets: {
        files: [
          {
            src: [ '**' ],
            dest: '<%= compile_dir %>/assets',
            cwd: '<%= build_dir %>/assets',
            expand: true
          }
        ]
      }
    },

    // JS Tasks
    concat: {
      /**
       * The `build_css` target concatenates compiled CSS and vendor CSS
       * together.
       */
      build_css: {
        src: [
          '<%= vendor_files.css %>',
          '<%= recess.build.dest %>'
        ],
        dest: '<%= recess.build.dest %>'
      },
      /**
       * The `compile_js` target is the concatenation of our application source
       * code and all specified vendor source code into a single file.
       */
      compile_js: {
        options: {
          banner: '<%= meta.banner %>'
        },
        src: [
          '<%= vendor_files.js %>',
          'module.prefix',
          '<%= build_dir %>/src/**/*.js',
          '<%= html2js.app.dest %>',
          '<%= html2js.common.dest %>',
          'module.suffix'
        ],
        dest: '<%= compile_dir %>/assets/<%= pkg.name %>-<%= pkg.version %>.js'
      }
    },

    /**
     * Compile Coffee scripts
     */
    coffee: {
      source: {
        options: {
          bare: true
        },
        expand: true,
        cwd: '.',
        src: [ '<%= app_files.coffee %>' ],
        dest: '<%= build_dir %>',
        ext: '.js'
      }
    },

    /**
     * `ng-min` annotates the sources before minifying. That is, it allows us
     * to code without the array syntax.
     */
    ngmin: {
      compile: {
        files: [
          {
            src: [ '<%= app_files.js %>' ],
            cwd: '<%= build_dir %>',
            dest: '<%= build_dir %>',
            expand: true
          }
        ]
      }
    },

   /**
     * Minify the sources!
     */
    uglify: {
      compile: {
        options: {
          banner: '<%= meta.banner %>'
        },
        files: {
          '<%= concat.compile_js.dest %>': '<%= concat.compile_js.dest %>'
        }
      }
    },

    // Style tasks
    /**
     * Minify CSS
     */
    cssmin: {
      combine: {
        files: {
          'target/<%= pkg.name %>-combined.css': ['src/css/*.css']
        }
      }
    },

    /**
     * Compile LESS templates to css
     */
    recess: {
      build: {
        src: [ '<%= app_files.less %>' ],
        dest: '<%= build_dir %>/assets/<%= pkg.name %>-<%= pkg.version %>.css',
        options: {
          compile: true,
          compress: false,
          noUnderscores: false,
          noIDs: false,
          zeroUnits: false
        }
      },
      compile: {
        src: [ '<%= recess.build.dest %>' ],
        dest: '<%= recess.build.dest %>',
        options: {
          compile: true,
          compress: true,
          noUnderscores: false,
          noIDs: false,
          zeroUnits: false
        }
      }
    },

    /**
     * `jshint` defines the rules of our linter as well as which files we
     * should check. This file, all javascript sources, and all our unit tests
     * are linted based on the policies listed in `options`. But we can also
     * specify exclusionary patterns by prefixing them with an exclamation
     * point (!); this is useful when code comes from a third party but is
     * nonetheless inside `src/`.
     */
    jshint: {
      src: [
        '<%= app_files.js %>'
      ],
      test: [
        '<%= app_files.jsunit %>'
      ],
      gruntfile: [
        'Gruntfile.js'
      ],
      options: {
        curly: true,
        immed: true,
        newcap: true,
        noarg: true,
        sub: true,
        boss: true,
        eqnull: true,
        globals: {
          "angular": true,
          "document": true,
          "dlux": true,
          "_": true,
          "require": true,
          "define": true,
          "requirejs": true,
          "describe": true,
          "expect": true,
          "it": true
        }
      }

    },

    // Coffe linting
    coffeelint: {
      src: {
        files: {
          src: [ '<%= app_files.coffee %>' ]
        }
      },
      test: {
        files: {
          src: [ '<%= app_files.coffeeunit %>' ]
        }
      }
    },

    /**
     * HTML2JS is a Grunt plugin that takes all of your template files and
     * places them into JavaScript files as strings that are added to
     * AngularJS's template cache. This means that the templates too become
     * part of the initial payload as one JavaScript file. Neat!
     */
    html2js: {
      /**
       * These are the templates from `src/app`.
       */
      app: {
        options: {
          base: 'src/app'
        },
        src: [ '<%= app_files.atpl %>' ],
        dest: '<%= build_dir %>/templates-app.js'
      },

      /**
       * These are the templates from `src/common`.
       */
      common: {
        options: {
          base: 'src/common'
        },
        src: [ '<%= app_files.ctpl %>' ],
        dest: '<%= build_dir %>/templates-common.js'
      }
    },

    /**
     * The Karma configurations.
     */
    karma: {
      options: {
        configFile: '<%= build_dir %>/karma-unit.js'
      },
      unit: {
        runnerPort: 9101,
        background: true
      },
      continuous: {
        singleRun: true
      }
    },

    /**
     * The `index` task compiles the `index.html` file as a Grunt template. CSS
     * and JS files co-exist here but they get split apart later.
     */
    index: {

      /**
       * During development, we don't want to have wait for compilation,
       * concatenation, minification, etc. So to avoid these steps, we simply
       * add all script files directly to the `<head>` of `index.html`. The
       * `src` property contains the list of included files.
       */
      build: {
        dir: '<%= build_dir %>',
        src: [
          '<%= vendor_files.js %>',
          '<%= build_dir %>/src/**/*.js',
          '<%= html2js.common.dest %>',
          '<%= html2js.app.dest %>',
          '<%= vendor_files.css %>',
          '<%= recess.build.dest %>'
        ]
      },

      /**
       * When it is time to have a completely compiled application, we can
       * alter the above to include only a single JavaScript and a single CSS
       * file. Now we're back!
       */
      compile: {
        dir: '<%= compile_dir %>',
        src: [
          '<%= concat.compile_js.dest %>',
          '<%= vendor_files.css %>',
          '<%= recess.compile.dest %>'
        ]
      }
    },

    /**
     * This task compiles the karma template so that changes to its file array
     * don't have to be managed manually.
     */
    karmaconfig: {
      unit: {
        dir: '<%= build_dir %>',
        src: [
          '<%= vendor_files.js %>',
          '<%= html2js.app.dest %>',
          '<%= html2js.common.dest %>',
          '<%= test_files.js %>'
        ]
      }
    },

    connect: {
      livereload: {
        options: {
          port: 9000,
          hostname: '0.0.0.0',
          middleware: function (connect) {
            return [
              mountFolder(connect, 'build'),
              lrSnippet
            ];
          }
        }
      },
      dev: {
        options: {
          hostname: '0.0.0.0',
          port: 9000,
          base: 'build'
        }
      },
      prod: {
        options: {
          port: 9001,
          base: 'bin',
          keepalive: true
        }
      }
    },
    open: {
      dev: {
        path: 'http://127.0.0.1:9000/'
      },
      prod: {
        path: 'http://127.0.0.1:9001/'
      }
    },
    delta: {
      /**
       * By default, we want the Live Reload to work for all tasks; this is
       * overridden in some tasks (like this file) where browser resources are
       * unaffected. It runs by default on port 35729, which your browser
       * plugin should auto-detect.
       */
      options: {
        livereload: true
      },

      /**
       * When the Gruntfile changes, we just want to lint it. In fact, when
       * your Gruntfile changes, it will automatically be reloaded!
       */
      gruntfile: {
        files: 'Gruntfile.js',
        tasks: [ 'jshint:gruntfile' ],
        options: {
          livereload: false
        }
      },

      /**
       * When our JavaScript source files change, we want to run lint them and
       * run our unit tests.
       */
      jssrc: {
        files: [
          '<%= app_files.js %>'
        ],
        tasks: [
          'jshint:src',
          'copy:build_appjs'
        ]
      },

      /**
       * When assets are changed, copy them. Note that this will *not* copy new
       * files, so this is probably not very useful.
       */
      assets: {
        files: [
          'src/assets/**/*'
        ],
        tasks: [ 'copy:build_assets' ]
      },

      /**
       * When index.html changes, we need to compile it.
       */
      html: {
        files: [ '<%= app_files.html %>' ],
        tasks: [ 'index:build' ]
      },

      /**
       * When our templates change, we only rewrite the template cache.
       */
      tpls: {
        files: [
          '<%= app_files.atpl %>',
          '<%= app_files.ctpl %>'
        ],
        tasks: [ 'html2js' ]
      },

      /**
       * When the CSS files change, we need to compile and minify them.
       */
      less: {
        files: [ 'src/**/*.less' ],
        tasks: [ 'build_styles' ]
      },

      /**
       * When a JavaScript unit test file changes, we only want to lint it and
       * run the unit tests. We don't want to do any live reloading.
       */
      jsunit: {
        files: [
          '<%= app_files.jsunit %>'
        ],
        tasks: [
          'jshint:test',
        ],
        options: {
          livereload: false
        }
      },

      /**
       * When a CoffeeScript unit test file changes, we only want to lint it and
       * run the unit tests. We don't want to do any live reloading.
       */
      coffeeunit: {
        files: [
          '<%= app_files.coffeeunit %>'
        ],
        tasks: [
          'coffeelint:test'
        ],
        options: {
          livereload: false
        }
      }
    }
  };

  grunt.initConfig( grunt.util._.extend( taskConfig, userConfig ) );

  /**
   * In order to make it safe to just compile or copy *only* what was changed,
   * we need to ensure we are starting from a clean, fresh build. So we rename
   * the `watch` task to `delta` (that's why the configuration var above is
   * `delta`) and then add a new task called `watch` that does a clean build
   * before watching for changes.
   */
  grunt.renameTask( 'watch', 'delta' );
  grunt.registerTask('watch', [ 'build', 'delta' ] );

  // task to do both vendor less compile and css concat.
  grunt.registerTask('build_styles', ['recess:build', 'concat:build_css']);

  grunt.registerTask('live', ['build', 'connect:dev', 'open:dev', 'delta']);

  /**
   * The default task is to build and compile.
   */
  grunt.registerTask( 'default', [ 'build', 'compile' ] );

  /**
   * The `build` task gets your app ready to run for development and testing.
   */
  grunt.registerTask( 'build', [
    'clean', 'html2js', 'coffeelint', 'coffee', 'build_styles',
    'copy:build_app_assets', 'copy:build_vendor_assets',
    'copy:build_appjs', 'copy:build_vendorjs', 'index:build'
  ]);
   // 'copy:build_assets', 'copy:build_appjs', 'copy:build_vendorjs', 'copy:build_vendorcss', 'copy:build_vendorassets',


  /**
   * The `compile` task gets your app ready for deployment by concatenating and
   * minifying your code.
   */
  grunt.registerTask( 'compile', [
    'recess:compile', 'copy:compile_assets', 'ngmin', 'concat:compile_js', 'uglify', 'index:compile'
  ]);

  /**
   * A utility function to get all app JavaScript sources.
   */
  function filterForJS ( files ) {
    return files.filter( function ( file ) {
      return file.match( /\.js$/ );
    });
  }

  /**
   * A utility function to get all app CSS sources.
   */
  function filterForCSS ( files ) {
    return files.filter( function ( file ) {
      return file.match( /\.css$/ );
    });
  }

  /**
   * The index.html template includes the stylesheet and javascript sources
   * based on dynamic names calculated in this Gruntfile. This task assembles
   * the list into variables for the template to use and then runs the
   * compilation.
   */
  grunt.registerMultiTask( 'index', 'Process index.html template', function () {
    var dirRE = new RegExp( '^('+grunt.config('build_dir')+'|'+grunt.config('compile_dir')+')\/', 'g' );
    var jsFiles = filterForJS( this.filesSrc ).map( function ( file ) {
      return file.replace( dirRE, '' );
    });
    var cssFiles = filterForCSS( this.filesSrc ).map( function ( file ) {
      return file.replace( dirRE, '' );
    });

    grunt.file.copy('src/index.html', this.data.dir + '/index.html', {
      process: function ( contents, path ) {
        return grunt.template.process( contents, {
          data: {
            scripts: jsFiles,
            styles: cssFiles,
            version: grunt.config( 'pkg.version' )
          }
        });
      }
    });
  });

  /**
   * In order to avoid having to specify manually the files needed for karma to
   * run, we use grunt to manage the list for us. The `karma/*` files are
   * compiled as grunt templates for use by Karma. Yay!
   */
  grunt.registerMultiTask( 'karmaconfig', 'Process karma config templates', function () {
    var jsFiles = filterForJS( this.filesSrc );

    grunt.file.copy( 'karma/karma-unit.tpl.js', grunt.config( 'build_dir' ) + '/karma-unit.js', {
      process: function ( contents, path ) {
        return grunt.template.process( contents, {
          data: {
            scripts: jsFiles
          }
        });
      }
    });
  });

};