/*!

* # Semantic UI - Checkbox
* http://github.com/semantic-org/semantic-ui/
*
*
* Released under the MIT license
* http://opensource.org/licenses/MIT
*
*/

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

“use strict”;

window = (typeof window != 'undefined' && window.Math == Math)

? window
: (typeof self != 'undefined' && self.Math == Math)
  ? self
  : Function('return this')()

;

$.fn.checkbox = function(parameters) {

var
  $allModules    = $(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.checkbox.settings, parameters),

      className       = settings.className,
      namespace       = settings.namespace,
      selector        = settings.selector,
      error           = settings.error,

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

      $module         = $(this),
      $label          = $(this).children(selector.label),
      $input          = $(this).children(selector.input),
      input           = $input[0],

      initialLoad     = false,
      shortcutPressed = false,
      instance        = $module.data(moduleNamespace),

      observer,
      element         = this,
      module
    ;

    module      = {

      initialize: function() {
        module.verbose('Initializing checkbox', settings);

        module.create.label();
        module.bind.events();

        module.set.tabbable();
        module.hide.input();

        module.observeChanges();
        module.instantiate();
        module.setup();
      },

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

      destroy: function() {
        module.verbose('Destroying module');
        module.unbind.events();
        module.show.input();
        $module.removeData(moduleNamespace);
      },

      fix: {
        reference: function() {
          if( $module.is(selector.input) ) {
            module.debug('Behavior called on <input> adjusting invoked element');
            $module = $module.closest(selector.checkbox);
            module.refresh();
          }
        }
      },

      setup: function() {
        module.set.initialLoad();
        if( module.is.indeterminate() ) {
          module.debug('Initial value is indeterminate');
          module.indeterminate();
        }
        else if( module.is.checked() ) {
          module.debug('Initial value is checked');
          module.check();
        }
        else {
          module.debug('Initial value is unchecked');
          module.uncheck();
        }
        module.remove.initialLoad();
      },

      refresh: function() {
        $label = $module.children(selector.label);
        $input = $module.children(selector.input);
        input  = $input[0];
      },

      hide: {
        input: function() {
          module.verbose('Modifying <input> z-index to be unselectable');
          $input.addClass(className.hidden);
        }
      },
      show: {
        input: function() {
          module.verbose('Modifying <input> z-index to be selectable');
          $input.removeClass(className.hidden);
        }
      },

      observeChanges: function() {
        if('MutationObserver' in window) {
          observer = new MutationObserver(function(mutations) {
            module.debug('DOM tree modified, updating selector cache');
            module.refresh();
          });
          observer.observe(element, {
            childList : true,
            subtree   : true
          });
          module.debug('Setting up mutation observer', observer);
        }
      },

      attachEvents: function(selector, event) {
        var
          $element = $(selector)
        ;
        event = $.isFunction(module[event])
          ? module[event]
          : module.toggle
        ;
        if($element.length > 0) {
          module.debug('Attaching checkbox events to element', selector, event);
          $element
            .on('click' + eventNamespace, event)
          ;
        }
        else {
          module.error(error.notFound);
        }
      },

      event: {
        click: function(event) {
          var
            $target = $(event.target)
          ;
          if( $target.is(selector.input) ) {
            module.verbose('Using default check action on initialized checkbox');
            return;
          }
          if( $target.is(selector.link) ) {
            module.debug('Clicking link inside checkbox, skipping toggle');
            return;
          }
          module.toggle();
          $input.focus();
          event.preventDefault();
        },
        keydown: function(event) {
          var
            key     = event.which,
            keyCode = {
              enter  : 13,
              space  : 32,
              escape : 27
            }
          ;
          if(key == keyCode.escape) {
            module.verbose('Escape key pressed blurring field');
            $input.blur();
            shortcutPressed = true;
          }
          else if(!event.ctrlKey && ( key == keyCode.space || key == keyCode.enter) ) {
            module.verbose('Enter/space key pressed, toggling checkbox');
            module.toggle();
            shortcutPressed = true;
          }
          else {
            shortcutPressed = false;
          }
        },
        keyup: function(event) {
          if(shortcutPressed) {
            event.preventDefault();
          }
        }
      },

      check: function() {
        if( !module.should.allowCheck() ) {
          return;
        }
        module.debug('Checking checkbox', $input);
        module.set.checked();
        if( !module.should.ignoreCallbacks() ) {
          settings.onChecked.call(input);
          settings.onChange.call(input);
        }
      },

      uncheck: function() {
        if( !module.should.allowUncheck() ) {
          return;
        }
        module.debug('Unchecking checkbox');
        module.set.unchecked();
        if( !module.should.ignoreCallbacks() ) {
          settings.onUnchecked.call(input);
          settings.onChange.call(input);
        }
      },

      indeterminate: function() {
        if( module.should.allowIndeterminate() ) {
          module.debug('Checkbox is already indeterminate');
          return;
        }
        module.debug('Making checkbox indeterminate');
        module.set.indeterminate();
        if( !module.should.ignoreCallbacks() ) {
          settings.onIndeterminate.call(input);
          settings.onChange.call(input);
        }
      },

      determinate: function() {
        if( module.should.allowDeterminate() ) {
          module.debug('Checkbox is already determinate');
          return;
        }
        module.debug('Making checkbox determinate');
        module.set.determinate();
        if( !module.should.ignoreCallbacks() ) {
          settings.onDeterminate.call(input);
          settings.onChange.call(input);
        }
      },

      enable: function() {
        if( module.is.enabled() ) {
          module.debug('Checkbox is already enabled');
          return;
        }
        module.debug('Enabling checkbox');
        module.set.enabled();
        settings.onEnable.call(input);
        // preserve legacy callbacks
        settings.onEnabled.call(input);
      },

      disable: function() {
        if( module.is.disabled() ) {
          module.debug('Checkbox is already disabled');
          return;
        }
        module.debug('Disabling checkbox');
        module.set.disabled();
        settings.onDisable.call(input);
        // preserve legacy callbacks
        settings.onDisabled.call(input);
      },

      get: {
        radios: function() {
          var
            name = module.get.name()
          ;
          return $('input[name="' + name + '"]').closest(selector.checkbox);
        },
        otherRadios: function() {
          return module.get.radios().not($module);
        },
        name: function() {
          return $input.attr('name');
        }
      },

      is: {
        initialLoad: function() {
          return initialLoad;
        },
        radio: function() {
          return ($input.hasClass(className.radio) || $input.attr('type') == 'radio');
        },
        indeterminate: function() {
          return $input.prop('indeterminate') !== undefined && $input.prop('indeterminate');
        },
        checked: function() {
          return $input.prop('checked') !== undefined && $input.prop('checked');
        },
        disabled: function() {
          return $input.prop('disabled') !== undefined && $input.prop('disabled');
        },
        enabled: function() {
          return !module.is.disabled();
        },
        determinate: function() {
          return !module.is.indeterminate();
        },
        unchecked: function() {
          return !module.is.checked();
        }
      },

      should: {
        allowCheck: function() {
          if(module.is.determinate() && module.is.checked() && !module.should.forceCallbacks() ) {
            module.debug('Should not allow check, checkbox is already checked');
            return false;
          }
          if(settings.beforeChecked.apply(input) === false) {
            module.debug('Should not allow check, beforeChecked cancelled');
            return false;
          }
          return true;
        },
        allowUncheck: function() {
          if(module.is.determinate() && module.is.unchecked() && !module.should.forceCallbacks() ) {
            module.debug('Should not allow uncheck, checkbox is already unchecked');
            return false;
          }
          if(settings.beforeUnchecked.apply(input) === false) {
            module.debug('Should not allow uncheck, beforeUnchecked cancelled');
            return false;
          }
          return true;
        },
        allowIndeterminate: function() {
          if(module.is.indeterminate() && !module.should.forceCallbacks() ) {
            module.debug('Should not allow indeterminate, checkbox is already indeterminate');
            return false;
          }
          if(settings.beforeIndeterminate.apply(input) === false) {
            module.debug('Should not allow indeterminate, beforeIndeterminate cancelled');
            return false;
          }
          return true;
        },
        allowDeterminate: function() {
          if(module.is.determinate() && !module.should.forceCallbacks() ) {
            module.debug('Should not allow determinate, checkbox is already determinate');
            return false;
          }
          if(settings.beforeDeterminate.apply(input) === false) {
            module.debug('Should not allow determinate, beforeDeterminate cancelled');
            return false;
          }
          return true;
        },
        forceCallbacks: function() {
          return (module.is.initialLoad() && settings.fireOnInit);
        },
        ignoreCallbacks: function() {
          return (initialLoad && !settings.fireOnInit);
        }
      },

      can: {
        change: function() {
          return !( $module.hasClass(className.disabled) || $module.hasClass(className.readOnly) || $input.prop('disabled') || $input.prop('readonly') );
        },
        uncheck: function() {
          return (typeof settings.uncheckable === 'boolean')
            ? settings.uncheckable
            : !module.is.radio()
          ;
        }
      },

      set: {
        initialLoad: function() {
          initialLoad = true;
        },
        checked: function() {
          module.verbose('Setting class to checked');
          $module
            .removeClass(className.indeterminate)
            .addClass(className.checked)
          ;
          if( module.is.radio() ) {
            module.uncheckOthers();
          }
          if(!module.is.indeterminate() && module.is.checked()) {
            module.debug('Input is already checked, skipping input property change');
            return;
          }
          module.verbose('Setting state to checked', input);
          $input
            .prop('indeterminate', false)
            .prop('checked', true)
          ;
          module.trigger.change();
        },
        unchecked: function() {
          module.verbose('Removing checked class');
          $module
            .removeClass(className.indeterminate)
            .removeClass(className.checked)
          ;
          if(!module.is.indeterminate() &&  module.is.unchecked() ) {
            module.debug('Input is already unchecked');
            return;
          }
          module.debug('Setting state to unchecked');
          $input
            .prop('indeterminate', false)
            .prop('checked', false)
          ;
          module.trigger.change();
        },
        indeterminate: function() {
          module.verbose('Setting class to indeterminate');
          $module
            .addClass(className.indeterminate)
          ;
          if( module.is.indeterminate() ) {
            module.debug('Input is already indeterminate, skipping input property change');
            return;
          }
          module.debug('Setting state to indeterminate');
          $input
            .prop('indeterminate', true)
          ;
          module.trigger.change();
        },
        determinate: function() {
          module.verbose('Removing indeterminate class');
          $module
            .removeClass(className.indeterminate)
          ;
          if( module.is.determinate() ) {
            module.debug('Input is already determinate, skipping input property change');
            return;
          }
          module.debug('Setting state to determinate');
          $input
            .prop('indeterminate', false)
          ;
        },
        disabled: function() {
          module.verbose('Setting class to disabled');
          $module
            .addClass(className.disabled)
          ;
          if( module.is.disabled() ) {
            module.debug('Input is already disabled, skipping input property change');
            return;
          }
          module.debug('Setting state to disabled');
          $input
            .prop('disabled', 'disabled')
          ;
          module.trigger.change();
        },
        enabled: function() {
          module.verbose('Removing disabled class');
          $module.removeClass(className.disabled);
          if( module.is.enabled() ) {
            module.debug('Input is already enabled, skipping input property change');
            return;
          }
          module.debug('Setting state to enabled');
          $input
            .prop('disabled', false)
          ;
          module.trigger.change();
        },
        tabbable: function() {
          module.verbose('Adding tabindex to checkbox');
          if( $input.attr('tabindex') === undefined) {
            $input.attr('tabindex', 0);
          }
        }
      },

      remove: {
        initialLoad: function() {
          initialLoad = false;
        }
      },

      trigger: {
        change: function() {
          var
            events       = document.createEvent('HTMLEvents'),
            inputElement = $input[0]
          ;
          if(inputElement) {
            module.verbose('Triggering native change event');
            events.initEvent('change', true, false);
            inputElement.dispatchEvent(events);
          }
        }
      },

      create: {
        label: function() {
          if($input.prevAll(selector.label).length > 0) {
            $input.prev(selector.label).detach().insertAfter($input);
            module.debug('Moving existing label', $label);
          }
          else if( !module.has.label() ) {
            $label = $('<label>').insertAfter($input);
            module.debug('Creating label', $label);
          }
        }
      },

      has: {
        label: function() {
          return ($label.length > 0);
        }
      },

      bind: {
        events: function() {
          module.verbose('Attaching checkbox events');
          $module
            .on('click'   + eventNamespace, module.event.click)
            .on('keydown' + eventNamespace, selector.input, module.event.keydown)
            .on('keyup'   + eventNamespace, selector.input, module.event.keyup)
          ;
        }
      },

      unbind: {
        events: function() {
          module.debug('Removing events');
          $module
            .off(eventNamespace)
          ;
        }
      },

      uncheckOthers: function() {
        var
          $radios = module.get.otherRadios()
        ;
        module.debug('Unchecking other radios', $radios);
        $radios.removeClass(className.checked);
      },

      toggle: function() {
        if( !module.can.change() ) {
          if(!module.is.radio()) {
            module.debug('Checkbox is read-only or disabled, ignoring toggle');
          }
          return;
        }
        if( module.is.indeterminate() || module.is.unchecked() ) {
          module.debug('Currently unchecked');
          module.check();
        }
        else if( module.is.checked() && module.can.uncheck() ) {
          module.debug('Currently checked');
          module.uncheck();
        }
      },
      setting: function(name, value) {
        module.debug('Changing setting', name, value);
        if( $.isPlainObject(name) ) {
          $.extend(true, settings, name);
        }
        else if(value !== undefined) {
          if($.isPlainObject(settings[name])) {
            $.extend(true, settings[name], value);
          }
          else {
            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.silent && 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.silent && 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() {
        if(!settings.silent) {
          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, 500);
        },
        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();
    }
  })
;

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

};

$.fn.checkbox.settings = {

name                : 'Checkbox',
namespace           : 'checkbox',

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

// delegated event context
uncheckable         : 'auto',
fireOnInit          : false,

onChange            : function(){},

beforeChecked       : function(){},
beforeUnchecked     : function(){},
beforeDeterminate   : function(){},
beforeIndeterminate : function(){},

onChecked           : function(){},
onUnchecked         : function(){},

onDeterminate       : function() {},
onIndeterminate     : function() {},

onEnable            : function(){},
onDisable           : function(){},

// preserve misspelled callbacks (will be removed in 3.0)
onEnabled           : function(){},
onDisabled          : function(){},

className       : {
  checked       : 'checked',
  indeterminate : 'indeterminate',
  disabled      : 'disabled',
  hidden        : 'hidden',
  radio         : 'radio',
  readOnly      : 'read-only'
},

error     : {
  method       : 'The method you called is not defined'
},

selector : {
  checkbox : '.ui.checkbox',
  label    : 'label, .box',
  input    : 'input[type="checkbox"], input[type="radio"]',
  link     : 'a[href]'
}

};

})( jQuery, window, document );