/*
 * # Semantic - Tab
 * http://github.com/semantic-org/semantic-ui/
 *
 *
 * Copyright 2014 Contributors
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 */

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

"use strict";

$.fn.tab = function(parameters) {

  var
    // use window context if none specified
    $allModules     = $.isFunction(this)
        ? $(window)
        : $(this),

    settings        = ( $.isPlainObject(parameters) )
      ? $.extend(true, {}, $.fn.tab.settings, parameters)
      : $.extend({}, $.fn.tab.settings),

    moduleSelector  = $allModules.selector || '',
    time            = new Date().getTime(),
    performance     = [],

    query           = arguments[0],
    methodInvoked   = (typeof query == 'string'),
    queryArguments  = [].slice.call(arguments, 1),

    module,
    returnedValue
  ;

  $allModules
    .each(function() {
      var

        className          = settings.className,
        metadata           = settings.metadata,
        selector           = settings.selector,
        error              = settings.error,

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

        $module            = $(this),

        cache              = {},
        firstLoad          = true,
        recursionDepth     = 0,

        $context,
        $tabs,
        activeTabPath,
        parameterArray,
        historyEvent,

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

      module = {

        initialize: function() {
          module.debug('Initializing tab menu item', $module);

          module.determineTabs();
          module.debug('Determining tabs', settings.context, $tabs);

          // set up automatic routing
          if(settings.auto) {
            module.verbose('Setting up automatic tab retrieval from server');
            settings.apiSettings = {
              url: (settings.path || '') + '/{$tab}'
            };
          }

          // attach events if navigation wasn't set to window
          if( !$.isWindow( element ) ) {
            module.debug('Attaching tab activation events to element', $module);
            $module
              .on('click' + eventNamespace, module.event.click)
            ;
          }
          module.instantiate();
        },

        determineTabs: function() {
          var
            $reference
          ;

          // determine tab context
          if(settings.context === 'parent') {
            if($module.closest(selector.ui).length > 0) {
              $reference = $module.closest(selector.ui);
              module.verbose('Using closest UI element for determining parent', $reference);
            }
            else {
              $reference = $module;
            }
            $context = $reference.parent();
            module.verbose('Determined parent element for creating context', $context);
          }
          else if(settings.context) {
            $context = $(settings.context);
            module.verbose('Using selector for tab context', settings.context, $context);
          }
          else {
            $context = $('body');
          }

          // find tabs
          if(settings.childrenOnly) {
            $tabs = $context.children(selector.tabs);
            module.debug('Searching tab context children for tabs', $context, $tabs);
          }
          else {
            $tabs = $context.find(selector.tabs);
            module.debug('Searching tab context for tabs', $context, $tabs);
          }
        },

        initializeHistory: function() {
          if(settings.history) {
            module.debug('Initializing page state');
            if( $.address === undefined ) {
              module.error(error.state);
              return false;
            }
            else {
              if(settings.historyType == 'state') {
                module.debug('Using HTML5 to manage state');
                if(settings.path !== false) {
                  $.address
                    .history(true)
                    .state(settings.path)
                  ;
                }
                else {
                  module.error(error.path);
                  return false;
                }
              }
              $.address
                .bind('change', module.event.history.change)
              ;
            }
          }
        },

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

        destroy: function() {
          module.debug('Destroying tabs', $module);
          $module
            .removeData(moduleNamespace)
            .off(eventNamespace)
          ;
        },

        event: {
          click: function(event) {
            var
              tabPath = $(this).data(metadata.tab)
            ;
            if(tabPath !== undefined) {
              if(settings.history) {
                module.verbose('Updating page state', event);
                $.address.value(tabPath);
              }
              else {
                module.verbose('Changing tab', event);
                module.changeTab(tabPath);
              }
              event.preventDefault();
            }
            else {
              module.debug('No tab specified');
            }
          },
          history: {
            change: function(event) {
              var
                tabPath   = event.pathNames.join('/') || module.get.initialPath(),
                pageTitle = settings.templates.determineTitle(tabPath) || false
              ;
              module.performance.display();
              module.debug('History change event', tabPath, event);
              historyEvent = event;
              if(tabPath !== undefined) {
                module.changeTab(tabPath);
              }
              if(pageTitle) {
                $.address.title(pageTitle);
              }
            }
          }
        },

        refresh: function() {
          if(activeTabPath) {
            module.debug('Refreshing tab', activeTabPath);
            module.changeTab(activeTabPath);
          }
        },

        cache: {

          read: function(cacheKey) {
            return (cacheKey !== undefined)
              ? cache[cacheKey]
              : false
            ;
          },
          add: function(cacheKey, content) {
            cacheKey = cacheKey || activeTabPath;
            module.debug('Adding cached content for', cacheKey);
            cache[cacheKey] = content;
          },
          remove: function(cacheKey) {
            cacheKey = cacheKey || activeTabPath;
            module.debug('Removing cached content for', cacheKey);
            delete cache[cacheKey];
          }
        },

        set: {
          state: function(state) {
            $.address.value(state);
          }
        },

        changeTab: function(tabPath) {
          var
            pushStateAvailable = (window.history && window.history.pushState),
            shouldIgnoreLoad   = (pushStateAvailable && settings.ignoreFirstLoad && firstLoad),
            remoteContent      = (settings.auto || $.isPlainObject(settings.apiSettings) ),
            // only get default path if not remote content
            pathArray = (remoteContent && !shouldIgnoreLoad)
              ? module.utilities.pathToArray(tabPath)
              : module.get.defaultPathArray(tabPath)
          ;
          tabPath = module.utilities.arrayToPath(pathArray);
          $.each(pathArray, function(index, tab) {
            var
              currentPathArray   = pathArray.slice(0, index + 1),
              currentPath        = module.utilities.arrayToPath(currentPathArray),

              isTab              = module.is.tab(currentPath),
              isLastIndex        = (index + 1 == pathArray.length),

              $tab               = module.get.tabElement(currentPath),
              $anchor,
              nextPathArray,
              nextPath,
              isLastTab
            ;
            module.verbose('Looking for tab', tab);
            if(isTab) {

              module.verbose('Tab was found', tab);
              // scope up
              activeTabPath  = currentPath;
              parameterArray = module.utilities.filterArray(pathArray, currentPathArray);

              if(isLastIndex) {
                isLastTab = true;
              }
              else {
                nextPathArray = pathArray.slice(0, index + 2);
                nextPath      = module.utilities.arrayToPath(nextPathArray);
                isLastTab     = ( !module.is.tab(nextPath) );
                if(isLastTab) {
                  module.verbose('Tab parameters found', nextPathArray);
                }
              }
              if(isLastTab && remoteContent) {
                if(!shouldIgnoreLoad) {
                  module.activate.navigation(currentPath);
                  module.content.fetch(currentPath, tabPath);
                }
                else {
                  module.debug('Ignoring remote content on first tab load', currentPath);
                  firstLoad = false;
                  module.cache.add(tabPath, $tab.html());
                  module.activate.all(currentPath);
                  settings.onTabInit.call($tab, currentPath, parameterArray, historyEvent);
                  settings.onTabLoad.call($tab, currentPath, parameterArray, historyEvent);
                }
                return false;
              }
              else {
                module.debug('Opened local tab', currentPath);
                module.activate.all(currentPath);
                if( !module.cache.read(currentPath) ) {
                  module.cache.add(currentPath, true);
                  module.debug('First time tab loaded calling tab init');
                  settings.onTabInit.call($tab, currentPath, parameterArray, historyEvent);
                }
                settings.onTabLoad.call($tab, currentPath, parameterArray, historyEvent);
              }
            }
            else if(tabPath.search('/') == -1 && tabPath !== '') {
              // look for in page anchor
              $anchor     = $('#' + tabPath + ', a[name="' + tabPath + '"]'),
              currentPath = $anchor.closest('[data-tab]').data('tab');
              $tab        = module.get.tabElement(currentPath);
              // if anchor exists use parent tab
              if($anchor && $anchor.length > 0 && currentPath) {
                module.debug('No tab found, but deep anchor link present, opening parent tab');
                module.activate.all(currentPath);
                if( !module.cache.read(currentPath) ) {
                  module.cache.add(currentPath, true);
                  module.debug('First time tab loaded calling tab init');
                  settings.onTabInit.call($tab, currentPath, parameterArray, historyEvent);
                }
                return false;
              }
            }
            else {
              module.error(error.missingTab, $module, $context, currentPath);
              return false;
            }
          });
        },

        content: {

          fetch: function(tabPath, fullTabPath) {
            var
              $tab        = module.get.tabElement(tabPath),
              apiSettings = {
                dataType : 'html',
                on       : 'now',
                onSuccess    : function(response) {
                  module.cache.add(fullTabPath, response);
                  module.content.update(tabPath, response);
                  if(tabPath == activeTabPath) {
                    module.debug('Content loaded', tabPath);
                    module.activate.tab(tabPath);
                  }
                  else {
                    module.debug('Content loaded in background', tabPath);
                  }
                  settings.onTabInit.call($tab, tabPath, parameterArray, historyEvent);
                  settings.onTabLoad.call($tab, tabPath, parameterArray, historyEvent);
                },
                urlData: { tab: fullTabPath }
              },
              request         = $tab.api('get request') || false,
              existingRequest = ( request && request.state() === 'pending' ),
              requestSettings,
              cachedContent
            ;

            fullTabPath   = fullTabPath || tabPath;
            cachedContent = module.cache.read(fullTabPath);


            if(settings.cache && cachedContent) {
              module.debug('Showing existing content', fullTabPath);
              module.content.update(tabPath, cachedContent);
              module.activate.tab(tabPath);
              settings.onTabLoad.call($tab, tabPath, parameterArray, historyEvent);
            }
            else if(existingRequest) {
              module.debug('Content is already loading', fullTabPath);
              $tab
                .addClass(className.loading)
              ;
            }
            else if($.api !== undefined) {
              requestSettings = $.extend(true, { headers: { 'X-Remote': true } }, settings.apiSettings, apiSettings);
              module.debug('Retrieving remote content', fullTabPath, requestSettings);
              console.log(existingRequest, requestSettings, cachedContent);
              $tab.api( requestSettings );
            }
            else {
              module.error(error.api);
            }
          },

          update: function(tabPath, html) {
            module.debug('Updating html for', tabPath);
            var
              $tab = module.get.tabElement(tabPath)
            ;
            $tab
              .html(html)
            ;
          }
        },

        activate: {
          all: function(tabPath) {
            module.activate.tab(tabPath);
            module.activate.navigation(tabPath);
          },
          tab: function(tabPath) {
            var
              $tab = module.get.tabElement(tabPath)
            ;
            module.verbose('Showing tab content for', $tab);
            $tab
              .addClass(className.active)
              .siblings($tabs)
                .removeClass(className.active + ' ' + className.loading)
            ;
          },
          navigation: function(tabPath) {
            var
              $navigation = module.get.navElement(tabPath)
            ;
            module.verbose('Activating tab navigation for', $navigation, tabPath);
            $navigation
              .addClass(className.active)
              .siblings($allModules)
                .removeClass(className.active + ' ' + className.loading)
            ;
          }
        },

        deactivate: {
          all: function() {
            module.deactivate.navigation();
            module.deactivate.tabs();
          },
          navigation: function() {
            $allModules
              .removeClass(className.active)
            ;
          },
          tabs: function() {
            $tabs
              .removeClass(className.active + ' ' + className.loading)
            ;
          }
        },

        is: {
          tab: function(tabName) {
            return (tabName !== undefined)
              ? ( module.get.tabElement(tabName).length > 0 )
              : false
            ;
          }
        },

        get: {
          initialPath: function() {
            return $allModules.eq(0).data(metadata.tab) || $tabs.eq(0).data(metadata.tab);
          },
          path: function() {
            return $.address.value();
          },
          // adds default tabs to tab path
          defaultPathArray: function(tabPath) {
            return module.utilities.pathToArray( module.get.defaultPath(tabPath) );
          },
          defaultPath: function(tabPath) {
            var
              $defaultNav = $allModules.filter('[data-' + metadata.tab + '^="' + tabPath + '/"]').eq(0),
              defaultTab  = $defaultNav.data(metadata.tab) || false
            ;
            if( defaultTab ) {
              module.debug('Found default tab', defaultTab);
              if(recursionDepth < settings.maxDepth) {
                recursionDepth++;
                return module.get.defaultPath(defaultTab);
              }
              module.error(error.recursion);
            }
            else {
              module.debug('No default tabs found for', tabPath, $tabs);
            }
            recursionDepth = 0;
            return tabPath;
          },
          navElement: function(tabPath) {
            tabPath = tabPath || activeTabPath;
            return $allModules.filter('[data-' + metadata.tab + '="' + tabPath + '"]');
          },
          tabElement: function(tabPath) {
            var
              $fullPathTab,
              $simplePathTab,
              tabPathArray,
              lastTab
            ;
            tabPath        = tabPath || activeTabPath;
            tabPathArray   = module.utilities.pathToArray(tabPath);
            lastTab        = module.utilities.last(tabPathArray);
            $fullPathTab   = $tabs.filter('[data-' + metadata.tab + '="' + lastTab + '"]');
            $simplePathTab = $tabs.filter('[data-' + metadata.tab + '="' + tabPath + '"]');
            return ($fullPathTab.length > 0)
              ? $fullPathTab
              : $simplePathTab
            ;
          },
          tab: function() {
            return activeTabPath;
          }
        },

        utilities: {
          filterArray: function(keepArray, removeArray) {
            return $.grep(keepArray, function(keepValue) {
              return ( $.inArray(keepValue, removeArray) == -1);
            });
          },
          last: function(array) {
            return $.isArray(array)
              ? array[ array.length - 1]
              : false
            ;
          },
          pathToArray: function(pathName) {
            if(pathName === undefined) {
              pathName = activeTabPath;
            }
            return typeof pathName == 'string'
              ? pathName.split('/')
              : [pathName]
            ;
          },
          arrayToPath: function(pathArray) {
            return $.isArray(pathArray)
              ? pathArray.join('/')
              : false
            ;
          }
        },

        setting: function(name, value) {
          module.debug('Changing setting', name, value);
          if( $.isPlainObject(name) ) {
            $.extend(true, settings, name);
          }
          else if(value !== undefined) {
            settings[name] = value;
          }
          else {
            return settings[name];
          }
        },
        internal: function(name, value) {
          if( $.isPlainObject(name) ) {
            $.extend(true, module, name);
          }
          else if(value !== undefined) {
            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({
                'Name'           : message[0],
                'Arguments'      : [].slice.call(message, 1) || '',
                'Element'        : element,
                '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( (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 {
                module.error(error.method, query);
                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) {
          instance.invoke('destroy');
        }
        module.initialize();
      }
    })
  ;
  if(module && !methodInvoked) {
    module.initializeHistory();
  }
  return (returnedValue !== undefined)
    ? returnedValue
    : this
  ;

};

// shortcut for tabbed content with no defined navigation
$.tab = function() {
  $(window).tab.apply(this, arguments);
};

$.fn.tab.settings = {

  name            : 'Tab',
  namespace       : 'tab',

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

  auto            : false,  // uses pjax style endpoints fetching content from same url with remote-content headers
  history         : false,  // use browser history
  historyType     : 'hash', // #/ or html5 state
  path            : false,  // base path of url

  context         : false,  // specify a context that tabs must appear inside
  childrenOnly    : false,  // use only tabs that are children of context
  maxDepth        : 25,     // max depth a tab can be nested

  alwaysRefresh   : false,  // load tab content new every tab click
  cache           : true,   // cache the content requests to pull locally
  ignoreFirstLoad : false,  // don't load remote content on first load
  apiSettings     : false,  // settings for api call

  onTabInit    : function(tabPath, parameterArray, historyEvent) {}, // called first time loaded
  onTabLoad    : function(tabPath, parameterArray, historyEvent) {}, // called on every load

  templates    : {
    determineTitle: function(tabArray) {} // returns page title for path
  },

  error: {
    api        : 'You attempted to load content without API module',
    method     : 'The method you called is not defined',
    missingTab : 'Activated tab cannot be found for this context.',
    noContent  : 'The tab you specified is missing a content url.',
    path       : 'History enabled, but no path was specified',
    recursion  : 'Max recursive depth reached',
    state      : 'History requires Asual\'s Address library <https://github.com/asual/jquery-address>'
  },

  metadata : {
    tab    : 'tab',
    loaded : 'loaded',
    promise: 'promise'
  },

  className   : {
    loading : 'loading',
    active  : 'active'
  },

  selector    : {
    tabs : '.ui.tab',
    ui   : '.ui'
  }

};

})( jQuery, window , document );