/**
 * TweetQuote (tweetquote.co.uk)
 *
 * The MIT License
 * 
 * Copyright (c) 2009 Paul James Campbell (tweetquote.co.uk)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
var tweetquote = function () {
  
  // Variables
  var config = {
    'refreshRate'      :  10000, 
    'phrase'          :   false,     
    'username'        :   false, 
    'hashtag'        :   false,
    'geocode'        :   false, 
    'advancedquery'    :   false,
    'includeauthor'    :   true,
    'stripurls'        :   true, 
    'stripTwitterTags'  :   true,
    'classname'        :  false, 
    'lang'          :   "en", // http://en.wikipedia.org/wiki/ISO_639-1
    'animationtype'    :  'fade', 
    'animationspeed'    :  'slow', 
    'defaulttext'      :  "Hold up, we're just loading some tweets."
  };
  
  var rootId = 'tweet_quote', wrapId = 'tweet_quote_wrapper', textId = "tweet_quote_text", authorId = 'tweet_quote_author', rootDom, quoteDom, intId, sinceId, handlerTextParser, handlerQuoteUpdate; 
  
  // Construct
  (function () {
    if( !window['jQuery'] ) {
      // Load jQuery from Google API
      document.write('<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script>');
    }    
  })();
  
  
  // Initiate
  function init () {
    try {
      if( config.phrase || config.username || config.hashtag || config.advancedquery ) {
        
        document.write('<div id="' + rootId + '"></div>');
        rootDom = $("#" + rootId);
        
        if( config.classname.constructor === String ) {
          rootDom.addClass( config.classname );
        }
        
        if( config.defaulttext.constructor === String ) {
          rootDom.html( '<div id="' + wrapId + '"><span id="' + textId + '">' + config.defaulttext + '</span></div>' );
        }
        
      }
    } catch ( e ) {
      logError( e );
      return;
    }    
    
    getTweet();
    initRefresh();
  }
  
  function initRefresh () {
    intId = setInterval( getTweet, config.refreshRate );
  }
  
  function stopRefresh () {
    clearInterval( intId );
  }
  
  function getTweet () {
    // http://apiwiki.twitter.com/Search+API+Documentation
    
    var api = 'http://search.twitter.com/search.json?rpp=1&callback=tweetquote.onApiCallback&';
    if( sinceId ) {
      api += 'since_id=' + sinceId + '&';
    }
    
    // Construct API call
    if( config.phrase ) {
      api += 'q=' + config.phrase;
    } else if ( config.username ) {
      api += 'q=from%3A' + config.username;
    } else if ( config.hashtag ) {
      api += 'q=%23' + config.hashtag;
    } else if ( config.advancedquery ) {
      api += 'q=' + config.advancedquery;
    }
    
    if( config.geocode ) {
      api += "&geocode=" + config.geocode;
    }
    
    try {
      rootDom.before('<script type="text/javascript" src="' + api + '"></script>');
    } catch ( e ) {
      logError ( e );
    }
  }
  
  function filterTweet ( json ) { 
    if( json.results && json.results.length > 0 ) {
      var tweet = json.results[0];
      
      sinceId = tweet.id;
      html = '<div id="' + wrapId + '">' + getTweetText( tweet ) + '</div>';
      
      if(rootDom.html() != html) {
        
        rootDom.html( html );
        wrapperNode = $('#' + wrapId);
        wrapperNode.hide();
        
        switch( config.animationtype ) {
          case 'fade' :
            wrapperNode.fadeIn( config.animationspeed );
            break;
          case 'slide' :
            wrapperNode.slideIn( config.animationspeed );
            break;
          default :
            // Nothing
            wrapperNode.show();
            break;
        }
        
        
        if( handlerQuoteUpdate ) {
          handlerQuoteUpdate( wrapperNode );
        }
      }
    }
  }
  
  function getTweetText ( tweet ) {
    var text = tweet.text;
    if ( config.stripurls ) {
      var pattern_url = /https?:\/\/([\-\w\.]+)+(:\d+)?(\/([\w\/_\.]*(\?\S+)?)?)?/ig;
      text = text.replace( pattern_url , '');
    }
    
    if( config.stripTwitterTags ) { // Still working on
      //var pattern_tags = /RT|\'|\"|/ig;
      //text = text.replace( pattern_tags , '');
    }
    
    var html = '<span id="' + textId + '">' + text + '</span>';
    if( config.includeauthor ) {
      html += ' <span id="' + authorId + '">from ' + '<a href="http://www.twitter.com/' + tweet.from_user + '">' + tweet.from_user + '</a></span>';
    }    
    if( handlerTextParser ) {
      return( handlerTextParser( html, tweet ) );
    }
    return( html.replace(/^\s+|\s+$/g, '') );
  }
  
  function logError ( e ) {
    // For clued up Firefox/Safari developers
    if(console && console.log) {
      console.log("TQ: " + e);
    }
  }
  
  return {
    
    load : function ( options ) {
      
      if( options.constructor === String) {
        // Assume basic string, add as phrase
        config.phrase = options;
      } else {
        $.extend(config, options);
      }
      
      init();
    },
    
    stop : function () {
      stopRefresh();
    },
    
    // Public method for Twitter search API (don't use)
    onApiCallback : function ( json ) {
      filterTweet( json );
    },
    
    // Custom callback handlers
    onTextParse : function ( func ) {
      handlerTextParser = func;
    },
    
    onQuoteUpdate : function ( func ) {
      handlerQuoteUpdate = func;
    }
    
  };
  
}();
window.tweetquote = tweetquote; // Ensure global scope