//convertTemperature.js
/*global adventurejs A*/ 
"use strict";
/**
 * INCOMPLETE. A simple function to check whether a value is === false or null.
 * @method adventurejs.Game#convertTemperature
 * @memberOf adventurejs.Game
 * @param {Number|String} temperature In Celsius.
 * @param {String} parent_id The ID of the game object the temperature applies to.
 * @returns {Boolean}
 * @todo Finish writing this.
 */
adventurejs.convertTemperature = function Adventurejs_convertTemperature(temperature, parent_id) {
  var newtemperature;

  // if it's number-as-string, convert to number
  // we default to celsius, so there y'go
  if( false === isNaN( temperature ) )
  {
    newtemperature = Number( temperature );
  }

  // if it's a string, check for digits and suffix
  else if( "string" === typeof temperature ) 
  { 

    // strip out spaces
    newtemperature = temperature.replace(/[ ]/g, "");

    var digits = "";
    var suffix = "";
  
    // separate digits from suffix
    // we're going to allow different forms of suffixes
    // so we're going to check every character 
    for(var char in temperature)
    {
      var digit = ( false === isNaN(temperature[char]) || "." == temperature[char] );

      if( digit )
      {

        // we only count digits until we start assembling a suffix
        // if this is true, we've encountered a digit in what we 
        // think is the suffix and we don't know what to do with that
        if( 0 > suffix.length  ) break;

        digits = digits + temperature[char];
        continue;

      }

      suffix = suffix + temperature[char];

    }

    digits = Number( digits );

    if( "f" === suffix.toLowerCase() ) {
      // convert fahrenheit to celsius
      newtemperature = ( digits - 32 ) * ( 5 / 9 );
    }

    // no need here for c to f, but it would be
    // newtemperature = ( digits * ( 9 / 5 ) ) + 32

  }

  if( isNaN( newtemperature ) )
  {
    newtemperature = this.game.settings.room_temperature;
    // let author know we don't know what to do with temperature
    // and set newtemperature to 0 for a valid return
    var msg = "";
    if( "undefined" !== typeof parent_id ) msg += parent_id + "'s ";
    else msg += "An object's ";
    msg += "temperature was set to an invalid value. [MORE...] "
      + "\nconvertTemperature received a value of " + temperature + ". "
      + "\nAdventure.js defaults to temperature in celsius. "
      + "\nRecognized suffixes are: "
      + "\n - c (celsius)"
      + "\n - f (fahrenheit)";
    this.game.log( "warn", "critical", msg , 'Utility' );
  }

  return newtemperature;

}