/*

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

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

“use strict”;

$.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).find(selector.label).first(),
      $input          = $(this).find(selector.input),

      instance        = $module.data(moduleNamespace),

      observer,
      element         = this,
      module
    ;

    module      = {

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

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

        if( module.is.checked() ) {
          module.set.checked();
          if(settings.fireOnInit) {
            $.proxy(settings.onChecked, $input.get())();
          }
        }
        else {
          module.remove.checked();
          if(settings.fireOnInit) {
            $.proxy(settings.onUnchecked, $input.get())();
          }
        }
        module.observeChanges();

        module.instantiate();
      },

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

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

      refresh: function() {
        $module = $(this);
        $label  = $(this).find(selector.label).first();
        $input  = $(this).find(selector.input);
      },

      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.size() > 0) {
          module.debug('Attaching checkbox events to element', selector, event);
          $element
            .on('click' + eventNamespace, event)
          ;
        }
        else {
          module.error(error.notFound);
        }
      },

      event: {
        keydown: function(event) {
          var
            key     = event.which,
            keyCode = {
              enter  : 13,
              escape : 27
            }
          ;
          if( key == keyCode.escape) {
            module.verbose('Escape key pressed blurring field');
            $module
              .blur()
            ;
          }
          if(!event.ctrlKey && key == keyCode.enter) {
            module.verbose('Enter key pressed, toggling checkbox');
            $.proxy(module.toggle, this)();
            event.preventDefault();
          }
        }
      },

      is: {
        radio: function() {
          return $module.hasClass(className.radio);
        },
        checked: function() {
          return $input.prop('checked') !== undefined && $input.prop('checked');
        },
        unchecked: function() {
          return !module.is.checked();
        }
      },

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

      set: {
        checked: function() {
          $module.addClass(className.checked);
        },
        tab: function() {
          if( $input.attr('tabindex') === undefined) {
            $input
              .attr('tabindex', 0)
            ;
          }
        }
      },

      create: {
        label: function() {
          if($input.prevAll(selector.label).size() > 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.size() > 0);
        }
      },

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

      remove: {
        checked: function() {
          $module.removeClass(className.checked);
        },
        events: function() {
          module.debug('Removing events');
          $module
            .off(eventNamespace)
            .removeData(moduleNamespace)
          ;
          $input
            .off(eventNamespace, module.event.keydown)
          ;
          $label
            .off(eventNamespace)
          ;
        }
      },

      enable: function() {
        module.debug('Enabling checkbox functionality');
        $module.removeClass(className.disabled);
        $input.prop('disabled', false);
        $.proxy(settings.onEnabled, $input.get())();
      },

      disable: function() {
        module.debug('Disabling checkbox functionality');
        $module.addClass(className.disabled);
        $input.prop('disabled', 'disabled');
        $.proxy(settings.onDisabled, $input.get())();
      },

      check: function() {
        module.debug('Enabling checkbox', $input);
        $input
          .prop('checked', true)
          .trigger('change')
        ;
        module.set.checked();
        $.proxy(settings.onChange, $input.get())();
        $.proxy(settings.onChecked, $input.get())();
      },

      uncheck: function() {
        module.debug('Disabling checkbox');
        $input
          .prop('checked', false)
          .trigger('change')
        ;
        module.remove.checked();
        $.proxy(settings.onChange, $input.get())();
        $.proxy(settings.onUnchecked, $input.get())();
      },

      toggle: function(event) {
        if( !module.can.change() ) {
          console.log(module.can.change());
          module.debug('Checkbox is read-only or disabled, ignoring toggle');
          return;
        }
        module.verbose('Determining new checkbox state');
        if( module.is.unchecked() ) {
          module.check();
        }
        else if( module.is.checked() && module.can.uncheck() ) {
          module.uncheck();
        }
      },
      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) {
        module.destroy();
      }
      module.initialize();
    }
  })
;

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

};

$.fn.checkbox.settings = {

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

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

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

onChange    : function(){},
onChecked   : function(){},
onUnchecked : function(){},
onEnabled   : function(){},
onDisabled  : function(){},

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

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

selector : {
  input  : 'input[type=checkbox], input[type=radio]',
  label  : 'label'
}

};

})( jQuery, window , document );