module.exports = function (grunt) {
  'use strict';

  var requirejs = require('requirejs');
  var path = require('path');

  var rDefineStart = /define\([^{]*?{/;
  var rDefineEndWithReturn = /\s*return\s+[^\}]+(\}\);[^\w\}]*)$/;
  var rDefineEnd = /\}\);[^}\w]*$/;

  grunt.registerMultiTask('build', 'concatenate source: summernote.js', function () {

    /**
     * Strip all definitions generated by requirejs
     *
     * @param {String} name
     * @param {String} path
     * @param {String} contents The contents to be written (including their AMD wrappers)
     */
    var convert = function (name, path, contents) {
      contents = contents.replace(rDefineStart, '');

      if (rDefineEndWithReturn.test(contents)) {
        contents = contents.replace(rDefineEndWithReturn, '');
      } else {
        contents = contents.replace(rDefineEnd, '');
      }
      return contents;
    };

    var outputPath = this.data.outFile;
    /**
     * Handle final output from the optimizer
     */
    var out = function (compiled) {
      // 01. Embed version
      var version = grunt.config('pkg.version');
      compiled = compiled.replace(/@VERSION/g, version);

      // 02.  Embed Date
      var date = (new Date()).toISOString().replace(/:\d+\.\d+Z$/, 'Z');
      compiled = compiled.replace(/@DATE/g, date);

      grunt.file.write(outputPath, compiled);
    };

    var config = {
      name: 'summernote/summernote',
      baseUrl: this.data.baseUrl,
      out: out,
      optimize: 'none',
      wrap: {
        startFile: path.join(this.data.baseUrl, this.data.startFile),
        endFile: path.join(this.data.baseUrl, this.data.endFile)
      },
      findNestedDependencies: true,
      skipSemiColonInsertion: true,
      onBuildWrite: convert,
      excludeShallow: ['jquery', 'CodeMirror', 'app'],
      paths: {
        jquery: 'empty:',
        CodeMirror: 'empty:'
      },
      packages: [{
        name: 'summernote',
        location: './',
        main: 'summernote'
      }]
    };

    var done = this.async();
    requirejs.optimize(config, function () {
      done();
    }, function (err) {
      done(err);
    });
  });
};