// joinVerbNounPrepPrepNouns.js

(function() {
  /*global adventurejs A*/ 
  "use strict";

	var p = adventurejs.Parser.prototype;

  /**
   * <p>
   * Search input for compound verb phrases in the format of
   * "verb noun preposition preposition noun",
   * by comparing the input string against entries in 
   * dictionary.verb_noun_prep_prep_nouns, 
   * which was populated by Verb definitions.
   * If we find a set of words that match an entry, 
   * we compress the words into a single string
   * that is a Verb name.
   * </p> 
   * <p>
   * For example:<br>
   * <code class="property">"take skateboard from under bed"</code>
   * becomes 
   * <code class="property">"take_from skateboard bed"</code>
   * </p>
   * @memberOf adventurejs.Parser
   * @method adventurejs.Parser#joinVerbNounPrepPrepNouns
   * @param {String} input Player input.
   * @returns {String}
   */
   p.joinVerbNounPrepPrepNouns = function Parser_joinVerbNounPrepPrepNouns( input ) 
  {
		for( var i=0; i < this.dictionary.verb_noun_prep_prep_nouns.length; i++ ) 
    {
			var trio = this.dictionary.verb_noun_prep_prep_nouns[i][0];
			var verb = trio.split(" ")[0];
			var prep1 = trio.split(" ")[1];
			var prep2 = trio.split(" ")[2];
			var combined = this.dictionary.verb_noun_prep_prep_nouns[i][1];

      /**
       * Valid chars are alphanumeric, plus:
       * " " spaces, used as delimeters
       * "_" underscores, used to serialize compound names
       * "," commas, stripped from input but then used with multiple search results
       * "=" used with multiple search results
       * "&" used with multiple search results
       */
      var search = verb + " ([,_=&A-Za-z0-9]*) " + prep1 + " " + prep2 + " ([,_=&A-Za-z0-9]*)";

      var regex = new RegExp(search,"g");
			var replaced = input.replace(regex, combined + " $1 $2");
      if( replaced !== input ) 
      {
        // save a record of the original input
        this.input_history[ 0 ].input_verb = trio;
        this.input_history[ 0 ].joint = "verb_noun_prep_prep_noun";
        input = replaced;
        break;
      }
    }

    this.game.log( "log", "high", "parseInput.js > joinVerbNounPrepPrepNouns returns: " + input, 'Parser' );
    return input;

  }  
}());