/*
 * # Semantic - Visit
 * http://github.com/semantic-org/semantic-ui/
 *
 *
 * Copyright 2013 Contributors
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 */

;(function ($, window, document, undefined) {

$.visit = $.fn.visit = function(parameters) {
  var
    $allModules     = $.isFunction(this)
        ? $(window)
        : $(this),
    moduleSelector  = $allModules.selector || '',

    time            = new Date().getTime(),
    performance     = [],

    query           = arguments[0],
    methodInvoked   = (typeof query == 'string'),
    queryArguments  = [].slice.call(arguments, 1),
    returnedValue
  ;
  $allModules
    .each(function() {
      var
        settings        = $.extend(true, {}, $.fn.visit.settings, parameters),

        error           = settings.error,
        namespace       = settings.namespace,

        eventNamespace  = '.' + namespace,
        moduleNamespace = namespace + '-module',

        $module         = $(this),
        $displays       = $(),

        element         = this,
        instance        = $module.data(moduleNamespace),
        module
      ;
      module = {

        initialize: function() {
          if(settings.count) {
            module.store(settings.key.count, settings.count);
          }
          else if(settings.id) {
            module.add.id(settings.id);
          }
          else if(settings.increment && methodInvoked !== 'increment') {
            module.increment();
          }
          module.add.display($module);
          module.instantiate();
        },

        instantiate: function() {
          module.verbose('Storing instance of visit module', module);
          instance = module;
          $module
            .data(moduleNamespace, module)
          ;
        },

        destroy: function() {
          module.verbose('Destroying instance');
          $module
            .removeData(moduleNamespace)
          ;
        },

        increment: function(id) {
          var
            currentValue = module.get.count(),
            newValue     = +(currentValue) + 1
          ;
          if(id) {
            module.add.id(id);
          }
          else {
            if(newValue > settings.limit && !settings.surpass) {
              newValue = settings.limit;
            }
            module.debug('Incrementing visits', newValue);
            module.store(settings.key.count, newValue);
          }
        },

        decrement: function(id) {
          var
            currentValue = module.get.count(),
            newValue     = +(currentValue) - 1
          ;
          if(id) {
            module.remove.id(id);
          }
          else {
            module.debug('Removing visit');
            module.store(settings.key.count, newValue);
          }
        },

        get: {
          count: function() {
            return +(module.retrieve(settings.key.count)) || 0;
          },
          idCount: function(ids) {
            ids = ids || module.get.ids();
            return ids.length;
          },
          ids: function(delimitedIDs) {
            var
              idArray = []
            ;
            delimitedIDs = delimitedIDs || module.retrieve(settings.key.ids);
            if(typeof delimitedIDs === 'string') {
              idArray = delimitedIDs.split(settings.delimiter);
            }
            module.verbose('Found visited ID list', idArray);
            return idArray;
          },
          storageOptions: function(data) {
            var
              options = {}
            ;
            if(settings.expires) {
              options.expires = settings.expires;
            }
            if(settings.domain) {
              options.domain = settings.domain;
            }
            if(settings.path) {
              options.path = settings.path;
            }
            return options;
          }
        },

        has: {
          visited: function(id, ids) {
            var
              visited = false
            ;
            ids = ids || module.get.ids();
            if(id !== undefined && ids) {
              $.each(ids, function(index, value){
                if(value == id) {
                  visited = true;
                }
              });
            }
            return visited;
          }
        },

        set: {
          count: function(value) {
            module.store(settings.key.count, value);
          },
          ids: function(value) {
            module.store(settings.key.ids, value);
          }
        },

        reset: function() {
          module.store(settings.key.count, 0);
          module.store(settings.key.ids, null);
        },

        add: {
          id: function(id) {
            var
              currentIDs = module.retrieve(settings.key.ids),
              newIDs = (currentIDs === undefined || currentIDs === '')
                ? id
                : currentIDs + settings.delimiter + id
            ;
            if( module.has.visited(id) ) {
              module.debug('Unique content already visited, not adding visit', id, currentIDs);
            }
            else if(id === undefined) {
              module.debug('ID is not defined');
            }
            else {
              module.debug('Adding visit to unique content', id);
              module.store(settings.key.ids, newIDs);
            }
            module.set.count( module.get.idCount() );
          },
          display: function(selector) {
            var
              $element = $(selector)
            ;
            if($element.size() > 0 && !$.isWindow($element[0])) {
              module.debug('Updating visit count for element', $element);
              $displays = ($displays.size() > 0)
                ? $displays.add($element)
                : $element
              ;
            }
          }
        },

        remove: {
          id: function(id) {
            var
              currentIDs = module.get.ids(),
              newIDs     = []
            ;
            if(id !== undefined && currentIDs !== undefined) {
              module.debug('Removing visit to unique content', id, currentIDs);
              $.each(currentIDs, function(index, value){
                if(value !== id) {
                  newIDs.push(value);
                }
              });
              newIDs = newIDs.join(settings.delimiter);
              module.store(settings.key.ids, newIDs );
            }
            module.set.count( module.get.idCount() );
          }
        },

        check: {
          limit: function(value) {
            value = value || module.get.count();
            if(settings.limit) {
              if(value >= settings.limit) {
                module.debug('Pages viewed exceeded limit, firing callback', value, settings.limit);
                $.proxy(settings.onLimit, this)(value);
              }
              module.debug('Limit not reached', value, settings.limit);
              $.proxy(settings.onChange, this)(value);
            }
            module.update.display(value);
          }
        },

        update: {
          display: function(value) {
            value = value || module.get.count();
            if($displays.size() > 0) {
              module.debug('Updating displayed view count', $displays);
              $displays.html(value);
            }
          }
        },

        store: function(key, value) {
          var
            options = module.get.storageOptions(value)
          ;
          if(settings.storageMethod == 'localstorage' && window.localStorage !== undefined) {
            window.localStorage.setItem(key, value);
            module.debug('Value stored using local storage', key, value);
          }
          else if($.cookie !== undefined) {
            $.cookie(key, value, options);
            module.debug('Value stored using cookie', key, value, options);
          }
          else {
            module.error(error.noCookieStorage);
            return;
          }
          if(key == settings.key.count) {
            module.check.limit(value);
          }
        },
        retrieve: function(key, value) {
          var
            storedValue
          ;
          if(settings.storageMethod == 'localstorage' && window.localStorage !== undefined) {
            storedValue = window.localStorage.getItem(key);
          }
          // get by cookie
          else if($.cookie !== undefined) {
            storedValue = $.cookie(key);
          }
          else {
            module.error(error.noCookieStorage);
          }
          if(storedValue == 'undefined' || storedValue == 'null' || storedValue === undefined || storedValue === null) {
            storedValue = undefined;
          }
          return storedValue;
        },

        setting: function(name, value) {
          if( $.isPlainObject(name) ) {
            $.extend(true, settings, name);
          }
          else if(value !== undefined) {
            settings[name] = value;
          }
          else {
            return settings[name];
          }
        },
        internal: function(name, value) {
          module.debug('Changing internal', name, value);
          if(value !== undefined) {
            if( $.isPlainObject(name) ) {
              $.extend(true, module, name);
            }
            else {
              module[name] = value;
            }
          }
          else {
            return module[name];
          }
        },
        debug: function() {
          if(settings.debug) {
            if(settings.performance) {
              module.performance.log(arguments);
            }
            else {
              module.debug = Function.prototype.bind.call(console.info, console, settings.name + ':');
              module.debug.apply(console, arguments);
            }
          }
        },
        verbose: function() {
          if(settings.verbose && settings.debug) {
            if(settings.performance) {
              module.performance.log(arguments);
            }
            else {
              module.verbose = Function.prototype.bind.call(console.info, console, settings.name + ':');
              module.verbose.apply(console, arguments);
            }
          }
        },
        error: function() {
          module.error = Function.prototype.bind.call(console.error, console, settings.name + ':');
          module.error.apply(console, arguments);
        },
        performance: {
          log: function(message) {
            var
              currentTime,
              executionTime,
              previousTime
            ;
            if(settings.performance) {
              currentTime   = new Date().getTime();
              previousTime  = time || currentTime;
              executionTime = currentTime - previousTime;
              time          = currentTime;
              performance.push({
                'Element'        : element,
                'Name'           : message[0],
                'Arguments'      : [].slice.call(message, 1) || '',
                'Execution Time' : executionTime
              });
            }
            clearTimeout(module.performance.timer);
            module.performance.timer = setTimeout(module.performance.display, 100);
          },
          display: function() {
            var
              title = settings.name + ':',
              totalTime = 0
            ;
            time = false;
            clearTimeout(module.performance.timer);
            $.each(performance, function(index, data) {
              totalTime += data['Execution Time'];
            });
            title += ' ' + totalTime + 'ms';
            if(moduleSelector) {
              title += ' \'' + moduleSelector + '\'';
            }
            if($allModules.size() > 1) {
              title += ' ' + '(' + $allModules.size() + ')';
            }
            if( (console.group !== undefined || console.table !== undefined) && performance.length > 0) {
              console.groupCollapsed(title);
              if(console.table) {
                console.table(performance);
              }
              else {
                $.each(performance, function(index, data) {
                  console.log(data['Name'] + ': ' + data['Execution Time']+'ms');
                });
              }
              console.groupEnd();
            }
            performance = [];
          }
        },
        invoke: function(query, passedArguments, context) {
          var
            object = instance,
            maxDepth,
            found,
            response
          ;
          passedArguments = passedArguments || queryArguments;
          context         = element         || context;
          if(typeof query == 'string' && object !== undefined) {
            query    = query.split(/[\. ]/);
            maxDepth = query.length - 1;
            $.each(query, function(depth, value) {
              var camelCaseValue = (depth != maxDepth)
                ? value + query[depth + 1].charAt(0).toUpperCase() + query[depth + 1].slice(1)
                : query
              ;
              if( $.isPlainObject( object[camelCaseValue] ) && (depth != maxDepth) ) {
                object = object[camelCaseValue];
              }
              else if( object[camelCaseValue] !== undefined ) {
                found = object[camelCaseValue];
                return false;
              }
              else if( $.isPlainObject( object[value] ) && (depth != maxDepth) ) {
                object = object[value];
              }
              else if( object[value] !== undefined ) {
                found = object[value];
                return false;
              }
              else {
                return false;
              }
            });
          }
          if ( $.isFunction( found ) ) {
            response = found.apply(context, passedArguments);
          }
          else if(found !== undefined) {
            response = found;
          }
          if($.isArray(returnedValue)) {
            returnedValue.push(response);
          }
          else if(returnedValue !== undefined) {
            returnedValue = [returnedValue, response];
          }
          else if(response !== undefined) {
            returnedValue = response;
          }
          return found;
        }
      };
      if(methodInvoked) {
        if(instance === undefined) {
          module.initialize();
        }
        module.invoke(query);
      }
      else {
        if(instance !== undefined) {
          module.destroy();
        }
        module.initialize();
      }

    })
  ;
  return (returnedValue !== undefined)
    ? returnedValue
    : this
  ;
};

$.fn.visit.settings = {

  name          : 'Visit',

  debug         : false,
  verbose       : true,
  performance   : true,

  namespace     : 'visit',

  increment     : false,
  surpass       : false,
  count         : false,
  limit         : false,

  delimiter     : '&',
  storageMethod : 'localstorage',

  key           : {
    count : 'visit-count',
    ids   : 'visit-ids'
  },

  expires       : 30,
  domain        : false,
  path          : false,

  onLimit       : function() {},
  onChange      : function() {},

  error         : {
    method          : 'The method you called is not defined',
    missingPersist  : 'Using the persist setting requires the inclusion of PersistJS',
    noCookieStorage : 'The default storage cookie requires $.cookie to be included.'
  }

};

})( jQuery, window , document );