/*  ******************************
  Form Validation Components
  Author: Jack Lukic
  Notes: First Commit April 08, 2012

  Refactored May 28, 2013

  Allows you to validate forms based on a form validation object
  Form validation objects are bound by either data-validate="" metadata, or form id or name tags

******************************  */

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

$.fn.form = function(fields, parameters) {
  var
    $allModules     = $(this),
    
    settings        = $.extend(true, {}, $.fn.form.settings, parameters),
    validation      = $.extend({}, $.fn.form.settings.defaults, fields),

    eventNamespace  = '.' + settings.namespace,
    moduleNamespace = 'module-' + settings.namespace,
    moduleSelector  = $allModules.selector || '',

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

    query           = arguments[0],
    methodInvoked   = (typeof query == 'string'),
    queryArguments  = [].slice.call(arguments, 1),
    invokedResponse
  ;
  $allModules
    .each(function() {
      var
        $module    = $(this),
        $field     = $(this).find(settings.selector.field),
        $group     = $(this).find(settings.selector.group),
        $message   = $(this).find(settings.selector.message),
        $prompt    = $(this).find(settings.selector.prompt),
        $submit    = $(this).find(settings.selector.submit),
        
        formErrors = [],
        
        element    = this,
        instance   = $module.data('module-' + settings.namespace),
        
        namespace  = settings.namespace,
        metadata   = settings.metadata,
        className  = settings.className,
        error      = settings.error,
        module
      ;

      module      = {

        initialize: function() {
          module.verbose('Initializing form validation', $module, validation, settings);
          if(settings.keyboardShortcuts) {
            $field
              .on('keydown' + eventNamespace, module.event.field.keydown)
            ;
          }
          $module
            .on('submit' + eventNamespace, module.validate.form)
          ;
          $field
            .on('blur' + eventNamespace, module.event.field.change)
          ;
          $submit
            .on('click' + eventNamespace, module.submit)
          ;
        },

        destroy: function() {
          $module
            .off(namespace)
          ;
        },

        refresh: function() {
          $field = $module.find(settings.selector.field);
        },

        submit: function() {
          module.verbose('Submitting form', $module);
          $module
            .submit()
          ;
        },

        event: {
          field: {
            keydown: function(event) {
              var
                $field  = $(this),
                key     = event.which,
                keyCode = {
                  enter  : 13,
                  escape : 27
                }
              ;
              if( key == keyCode.escape) {
                module.verbose('Escape key pressed blurring field');
                $field
                  .blur()
                ;
              }
              if( key == keyCode.enter && $field.is(settings.selector.input) ) {
                module.debug('Enter key pressed, submitting form');
                $submit
                  .addClass(className.down)
                ;
                $field
                  .one('keyup' + eventNamespace, module.event.field.keyup)
                ;
                event.preventDefault();
                return false;
              }
            },
            keyup: function() {
              module.verbose('Doing keyboard shortcut form submit');
              $submit.removeClass(className.down);
              module.submit();
            },
            change: function() {
              var
                $field      = $(this),
                $fieldGroup = $field.closest($group)
              ;
              if( $fieldGroup.hasClass(className.error) ) {
                module.debug('Revalidating field', $field,  module.get.validation($field));
                module.validate.field( module.get.validation($field) );
              }
              else if(settings.on == 'change') {
                module.validate.field( module.get.validation($field) );
              }
            }
          }

        },

        get: {
          field: function(identifier) {
            module.verbose('Finding field with identifier', identifier);
            if( $field.filter('#' + identifier).size() > 0 ) {
              return $field.filter('#' + identifier);
            }
            else if( $field.filter('[name="' + identifier +'"]').size() > 0 ) {
              return $field.filter('[name="' + identifier +'"]');
            }
            else if( $field.filter('[data-' + metadata.validate + '="'+ identifier +'"]').size() > 0 ) {
              return $field.filter('[data-' + metadata.validate + '="'+ identifier +'"]');
            }
            return $('<input/>');
          },
          validation: function($field) {
            var 
              rules
            ;
            $.each(validation, function(fieldName, field) {
              if( module.get.field(field.identifier).get(0) == $field.get(0) ) {
                rules = field;
              }
            });
            return rules || false;
          }
        },

        has: {

          field: function(identifier) {
            module.verbose('Checking for existence of a field with identifier', identifier);
            if( $field.filter('#' + identifier).size() > 0 ) {
              return true;
            }
            else if( $field.filter('[name="' + identifier +'"]').size() > 0 ) {
              return true;
            }
            else if( $field.filter('[data-' + metadata.validate + '="'+ identifier +'"]').size() > 0 ) {
              return true;
            }
            return false;
          }

        },

        add: {
          prompt: function(field, errors) {
            var
              $field       = module.get.field(field.identifier),
              $fieldGroup  = $field.closest($group),
              $prompt      = $fieldGroup.find(settings.selector.prompt),
              promptExists = ($prompt.size() !== 0)
            ;
            module.verbose('Adding inline validation prompt');
            $fieldGroup
              .addClass(className.error)
            ;
            if(settings.inlineError) {
              if(!promptExists) {
                $prompt = settings.templates.prompt(errors);
                $prompt
                  .appendTo($fieldGroup)
                  .hide()
                ;
              }
              $prompt
                .html(errors[0])
              ;
              if($prompt.is(':not(:visible)')) {
                $prompt
                  .fadeIn(settings.animateSpeed)
                ;
              }
            }
          },
          errors: function(errors) {
            module.debug('Adding form error messages', errors);
            $message
              .html( settings.templates.error(errors) )
            ;
          }
        },

        remove: {
          prompt: function(field) {
            var
              $field      = module.get.field(field.identifier),
              $fieldGroup = $field.closest($group),
              $prompt     = $fieldGroup.find(settings.selector.prompt)
            ;
            $fieldGroup
              .removeClass(className.error)
            ;
            if(settings.inlineError) {
              $prompt.hide();
            }
          }
        },

        validate: {

          form: function(event) {
            var
              allValid = true
            ;
            // reset errors
            formErrors = [];
            $.each(validation, function(fieldName, field) {
              if( !( module.validate.field(field) ) ) {
                allValid = false;
              }
            });
            if(allValid) {
              module.debug('Form has no validation errors, submitting');
              $module
                .removeClass(className.error)
                .addClass(className.success)
              ;
              $.proxy(settings.onSuccess, this)(event);
            }
            else {
              module.debug('Form has errors');
              $module.addClass(className.error);
              if(!settings.inlineError) {
                module.add.errors(formErrors);
              }
              return $.proxy(settings.onFailure, this)(formErrors);
            }
          },

          // takes a validation object and returns whether field passes validation
          field: function(field) {
            var
              $field      = module.get.field(field.identifier),
              fieldValid  = true,
              fieldErrors = []
            ;
            if(field.rules !== undefined) {
              $.each(field.rules, function(index, rule) {
                if( module.has.field(field.identifier) && !( module.validate.rule(field, rule) ) ) {
                  module.debug('Field is invalid', field.identifier, rule.type);
                  fieldErrors.push(rule.prompt);
                  fieldValid = false;
                }
              });
            }
            if(fieldValid) {
              module.remove.prompt(field, fieldErrors);
              $.proxy(settings.onValid, $field)();
            }
            else {
              formErrors = formErrors.concat(fieldErrors);
              module.add.prompt(field, fieldErrors);
              $.proxy(settings.onInvalid, $field)(fieldErrors);
              return false;
            }
            return true;
          },

          // takes validation rule and returns whether field passes rule
          rule: function(field, validation) {
            var
              $field        = module.get.field(field.identifier),
              type          = validation.type,
              value         = $field.val(),

              bracketRegExp = /\[(.*?)\]/i,
              bracket       = bracketRegExp.exec(type),
              isValid       = true,
              ancillary,
              functionType
            ;
            // if bracket notation is used, pass in extra parameters
            if(bracket !== undefined && bracket !== null) {
              ancillary    = bracket[1];
              functionType = type.replace(bracket[0], '');
              isValid      = $.proxy(settings.rules[functionType], $module)(value, ancillary);
            }
            // normal notation
            else {
              isValid = (type == 'checked') 
                ? $field.filter(':checked').size() > 0
                : settings.rules[type](value)
              ;
            }
            return isValid;
          }
        },

        setting: function(name, value) {
          if(value !== undefined) {
            if( $.isPlainObject(name) ) {
              $.extend(true, settings, name);
            }
            else {
              settings[name] = value;
            }
          }
          else {
            return settings[name];
          }
        },
        internal: function(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.moduleName + ':');
            }
          }
        },
        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.moduleName + ':');
            }
          }
        },
        error: function() {
          module.error = Function.prototype.bind.call(console.log, console, settings.moduleName + ':');
        },
        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'      : message[1] || 'None',
                'Execution Time' : executionTime
              });
              clearTimeout(module.performance.timer);
              module.performance.timer = setTimeout(module.performance.display, 100);
            }
          },
          display: function() {
            var
              title              = settings.moduleName,
              caption            = settings.moduleName + ': ' + moduleSelector + '(' + $allModules.size() + ' elements)',
              totalExecutionTime = 0
            ;
            if(moduleSelector) {
              title += ' Performance (' + moduleSelector + ')';
            }
            if( (console.group !== undefined || console.table !== undefined) && performance.length > 0) {
              console.groupCollapsed(title);
              if(console.table) {
                $.each(performance, function(index, data) {
                  totalExecutionTime += data['Execution Time'];
                });
                console.table(performance);
              }
              else {
                $.each(performance, function(index, data) {
                  totalExecutionTime += data['Execution Time'];
                  console.log(data['Name'] + ': ' + data['Execution Time']+'ms');
                });
              }
              console.log('Total Execution Time:', totalExecutionTime +'ms');
              console.groupEnd();
              performance = [];
              time        = false;
            }
          }
        },
        invoke: function(query, passedArguments, context) {
          var
            maxDepth,
            found
          ;
          passedArguments = passedArguments || queryArguments;
          context         = element         || context;
          if(typeof query == 'string' && instance !== undefined) {
            query    = query.split('.');
            maxDepth = query.length - 1;
            $.each(query, function(depth, value) {
              if( $.isPlainObject( instance[value] ) && (depth != maxDepth) ) {
                instance = instance[value];
              }
              else if( instance[value] !== undefined ) {
                found = instance[value];
              }
              else {
                module.error(error.method);
              }
            });
          }
          if ( $.isFunction( found ) ) {
            instance.verbose('Executing invoked function', found);
            return found.apply(context, passedArguments);
          }
          return found || false;
        }
      };

      if(methodInvoked) {
        if(instance === undefined) {
          module.initialize();
        }
        invokedResponse = module.invoke(query);
      }
      else {
        if(instance !== undefined) {
          module.destroy();
        }
        module.initialize();
      }
    })
  ;
  return (invokedResponse)
    ? invokedResponse
    : this
  ;
};

$.fn.form.settings = {

  // module info
  moduleName        : 'Form',
  debug             : true,
  verbose           : true,
  performance       : false,
  namespace         : 'validate',
  
  keyboardShortcuts : true,
  on                : 'submit',
  animateSpeed      : 150,
  inlineError       : false,
  
  
  onValid           : function() {},
  onInvalid         : function() {},
  onSuccess         : function() { return true; },
  onFailure         : function() { return false; },

  metadata : {
    validate: 'validate'
  },

  selector : {
    message   : '.error.message',
    field     : 'input, textarea, select',
    group     : '.field',
    input     : 'input',
    prompt    : '.prompt',
    submit    : '.submit'
  },

  className : {
    error  : 'error',
    success: 'success',
    down   : 'down',
    label  : 'ui label prompt'
  },

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

  

  templates: {
    error: function(errors) {
      var 
        html = '<ul class="list">'
      ;
      $.each(errors, function(index, value) {
        html += '<li>' + value + '</li>';
      });
      html += '</ul>';
      return $(html);
    },
    prompt: function(errors) {
      return $('<div/>')
        .addClass('ui red pointing prompt label')
        .html(errors[0])
      ;
    }
  },

  rules: {
    empty: function(value) {
      return !(value === undefined || '' === value);
    },
    email: function(value){
      var 
        emailRegExp = new RegExp("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?")
      ;
      return emailRegExp.test(value);
    },
    length: function(value, requiredLength) {
      return (value !== undefined)
        ? (value.length >= requiredLength)
        : false
      ;
    },
    not: function(value, notValue) {
      return (value != notValue);
    },
    is: function(value, text) {
      return (value == text);
    },
    maxLength: function(value, maxLength) {
      return (value !== undefined)
        ? (value.length <= maxLength)
        : false
      ;
    },
    match: function(value, matchingField) {
      // use either id or name of field
      var
        $form = $(this),
        matchingValue
      ;
      if($form.find('#' + matchingField).size() > 0) {
        matchingValue = $form.find('#' + matchingField).val();
      }
      else if($form.find('[name=' + matchingField +']').size() > 0) {
        matchingValue = $form.find('[name=' + matchingField + ']').val();
      }
      else if( $form.find('[data-validate="'+ matchingField +'"]').size() > 0 ) {
        matchingValue = $form.find('[data-validate="'+ matchingField +'"]').val();
      }
      return (matchingValue !== undefined)
        ? ( value.toString() == matchingValue.toString() )
        : false
      ;
    },
    url: function(value) {
      var 
        urlRegExp = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
      ;
      return urlRegExp.test(value);
    }
  }

};

})( jQuery, window , document );