/*
 * grunt
 * http://gruntjs.com/
 *
 * Copyright (c) 2013 "Cowboy" Ben Alman
 * Licensed under the MIT license.
 * https://github.com/gruntjs/grunt/blob/master/LICENSE-MIT
 */

'use strict';

module.exports = function(grunt) {

  // Project configuration.
  grunt.initConfig({
    nodeunit: {
      all: ['test/{grunt,tasks,util}/**/*.js']
    },
    jshint: {
      gruntfile: ['Gruntfile.js'],
      libs_n_tests: ['lib/**/*.js', '<%= nodeunit.all %>'],
      subgrunt: ['<%= subgrunt.all %>'],
      options: {
        curly: true,
        eqeqeq: true,
        immed: true,
        latedef: true,
        newcap: true,
        noarg: true,
        sub: true,
        undef: true,
        unused: true,
        boss: true,
        eqnull: true,
        node: true,
        es5: true
      }
    },
    watch: {
      gruntfile: {
        files: ['<%= jshint.gruntfile %>'],
        tasks: ['jshint:gruntfile']
      },
      libs_n_tests: {
        files: ['<%= jshint.libs_n_tests %>'],
        tasks: ['jshint:libs_n_tests', 'nodeunit']
      },
      subgrunt: {
        files: ['<%= subgrunt.all %>'],
        tasks: ['jshint:subgrunt', 'subgrunt']
      }
    },
    subgrunt: {
      all: ['test/gruntfile/*.js']
    },
  });

  // These plugins provide necessary tasks.
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-nodeunit');
  grunt.loadNpmTasks('grunt-contrib-watch');

  // "npm test" runs these tasks
  grunt.registerTask('test', ['jshint', 'nodeunit', 'subgrunt']);

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

  // Run sub-grunt files, because right now, testing tasks is a pain.
  grunt.registerMultiTask('subgrunt', 'Run a sub-gruntfile.', function() {
    var path = require('path');
    grunt.util.async.forEachSeries(this.filesSrc, function(gruntfile, next) {
      grunt.util.spawn({
        grunt: true,
        args: ['--gruntfile', path.resolve(gruntfile)],
      }, function(error, result) {
        if (error) {
          grunt.log.error(result.stdout).writeln();
          next(new Error('Error running sub-gruntfile "' + gruntfile + '".'));
        } else {
          grunt.verbose.ok(result.stdout);
          next();
        }
      });
    }, this.async());
  });

};