/*
 * # 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) {
              settings.onChecked.call($input.get());
            }
          }
          else {
            module.remove.checked();
            if(settings.fireOnInit) {
              settings.onUnchecked.call($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.length > 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,
                space  : 32,
                escape : 27
              }
            ;
            if( key == keyCode.escape) {
              module.verbose('Escape key pressed blurring field');
              $module
                .blur()
              ;
            }
            if(!event.ctrlKey && (key == keyCode.enter || key == keyCode.space)) {
              module.verbose('Enter key pressed, toggling checkbox');
              module.toggle.call(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).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);
          }
        },

        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);
          $input.prop('disabled', false);
          settings.onEnabled.call($input.get());
        },

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

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

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