/**
 * © OpenCORD
 *
 * Visit http://guide.xosproject.org/devguide/addview/ for more information
 *
 * Created by teone on 4/18/16.
 */

(function () {
  'use strict';


  angular.module('xos.uiComponents')

  /**
    * @ngdoc directive
    * @name xos.uiComponents.directive:xosForm
    * @restrict E
    * @description The xos-form directive.
    * This components have two usage, given a model it is able to autogenerate a form or it can be configured to create a custom form.
    * @param {Object} config The configuration object
    * ```
    * {
    *   exclude: ['id', 'validators', 'created', 'updated', 'deleted'], //field to be skipped in the form, the provide values are concatenated
    *   order: ['field1', 'field2'], // ordering the fields (missing ones are attached at the end)
    *   actions: [ // define the form buttons with related callback
    *     {
            label: 'save',
            icon: 'ok', // refers to bootstraps glyphicon
            cb: (user) => { // receive the model
              console.log(user);
            },
            class: 'success'
          }
    *   ],
    *   feedback: {
          show: false,
          message: 'Form submitted successfully !!!',
          type: 'success'  //refers to bootstrap class
        },
    *   fields: {
    *     field_name: {
    *       label: 'Field Label',
    *       type: 'string' // options are: [date, boolean, number, email, string, select],
    *       validators: {
    *         minlength: number,
              maxlength: number,
              required: boolean,
              min: number,
              max: number,
              custom: (value) => {
                // do your validation here and return true | false
                // alternatively you can return an array [errorName, true|false]
              }
    *       }
    *     }
    *   }
    * }
    * ```
    * @param {Object} ngModel The model object (it is mandatory to specify at least an empty object)
    * @element ANY
    * @scope
    * @requires xos.uiComponents.directive:xosField
    * @requires xos.uiComponents.XosFormHelpers
    * @requires xos.helpers._
    * @example

    Autogenerated form

  <example module="sampleForm">
    <file name="script.js">
      angular.module('sampleForm', ['xos.uiComponents'])
      .factory('_', function($window){
        return $window._;
      })
      .controller('SampleCtrl', function(){
        this.model = {
          first_name: 'Jhon',
          last_name: 'Doe',
          email: 'jhon.doe@sample.com',
          active: true,
          birthDate: '2015-02-17T22:06:38.059000Z'
        }
        this.config = {
          exclude: ['password', 'last_login'],
          formName: 'sampleForm',
          actions: [
            {
              label: 'Save',
              icon: 'ok', // refers to bootstraps glyphicon
              cb: (user) => { // receive the model
                console.log(user);
              },
              class: 'success'
            }
          ]
        };
      });
    </file>
    <file name="index.html">
      <div ng-controller="SampleCtrl as vm">
        <xos-form ng-model="vm.model" config="vm.config"></xos-form>
      </div>
    </file>
  </example>

  Configuration defined form

  <example module="sampleForm1">
    <file name="script.js">
      angular.module('sampleForm1', ['xos.uiComponents','ngResource', 'ngMockE2E'])
      .factory('_', function($window){
        return $window._;
      })
      .controller('SampleCtrl1', function(SampleResource){

        this.model = {};

        this.config = {
          exclude: ['password', 'last_login'],
          formName: 'sampleForm1',
          feedback: {
            show: false,
            message: 'Form submitted successfully!',
            type: 'success'
          },
          actions: [
            {
              label: 'Save',
              icon: 'ok',
              cb: (user) => {
                console.log(user);
                this.config.feedback.show = true;
                this.config.feedback.type='success';
              },
              class: 'success'
            }
          ],
          order: ['site', 'last_name', 'first_name', 'age'],
          fields: {
            first_name: {
              type: 'string',
              validators: {
                required: true
              }
            },
            last_name: {
              label: 'Surname',
              type: 'string',
              validators: {
                required: true,
                minlength: 10
              }
            },
            age: {
              type: 'number',
              validators: {
                required: true,
                min: 21
              }
            },
            site: {
              label: 'Site',
              type: 'select',
              validators: { required: true},
              hint: 'The Site this Slice belongs to',
              options: []
            },
         }
        };
        SampleResource.query().$promise
        .then((users) => {
          this.optionVal = users;
          this.config.fields['site'].options = this.optionVal;
        })
        .catch((e) => {
          throw new Error(e);
        });
      });
    </file>
   <file name="backend.js">
     angular.module('sampleForm1')
     .run(function($httpBackend, _){
        let datas = [{id: 1, label: 'site1'},{id: 4, label: 'site4'},{id: 3, label: 'site3'}];
        let paramsUrl = new RegExp(/\/test\/(.+)/);
        $httpBackend.whenGET('/test').respond(200, datas)
      })
      .service('SampleResource', function($resource){
        return $resource('/test/:id', {id: '@id'});
      });
    </file>
    <file name="index.html">
      <div ng-controller="SampleCtrl1 as vm">
        <xos-form ng-model="vm.model" config="vm.config"></xos-form>
      </div>
    </file>
  </example>

  **/

  .component('xosForm', {
    restrict: 'E',
    bindings: {
      config: '=',
      ngModel: '='
    },
    template: `
      <form name="vm.{{vm.config.formName || 'form'}}" novalidate>
        <div class="form-group" ng-repeat="(name, field) in vm.formField">
          <xos-field name="name" field="field" ng-model="vm.ngModel[name]"></xos-field>
          <xos-validation field="vm[vm.config.formName || 'form'][name]" form = "vm[vm.config.formName || 'form']"></xos-validation>
          <div class="alert alert-info" ng-show="(field.hint).length >0" role="alert">{{field.hint}}</div>
        </div>
        <div class="form-group" ng-if="vm.config.actions">
        <xos-alert config="vm.config.feedback" show="vm.config.feedback.show">{{vm.config.feedback.message}}</xos-alert>

          <button role="button" href=""
            ng-repeat="action in vm.config.actions"
            ng-click="action.cb(vm.ngModel, vm[vm.config.formName || 'form'])"
            class="btn btn-{{action.class}}"
            title="{{action.label}}">
            <i class="glyphicon glyphicon-{{action.icon}}"></i>
            {{action.label}}
          </button>
        </div>
      </form>
    `,
    bindToController: true,
    controllerAs: 'vm',
    controller: function($scope, $log, _, XosFormHelpers){

      if(!this.config){
        throw new Error('[xosForm] Please provide a configuration via the "config" attribute');
      }

      if(!this.config.actions){
        throw new Error('[xosForm] Please provide an action list in the configuration');
      }

      if(!this.config.feedback){
        this.config.feedback =  {
          show: false,
          message: 'Form submitted successfully !!!',
          type: 'success'
        }
      }

      this.excludedField = ['id', 'validators', 'created', 'updated', 'deleted', 'backend_status'];
      if(this.config && this.config.exclude){
        this.excludedField = this.excludedField.concat(this.config.exclude);
      }

      this.formField = [];

      $scope.$watch(() => this.config, ()=> {
        if(!this.ngModel){
          return;
        }
        let diff = _.difference(Object.keys(this.ngModel), this.excludedField);
        let modelField = XosFormHelpers.parseModelField(diff);
        this.formField = XosFormHelpers.buildFormStructure(modelField, this.config.fields, this.ngModel, this.config.order);
      }, true);

      $scope.$watch(() => this.ngModel, (model) => {
        // empty from old stuff
        this.formField = {};
        if(!model){
          return;
        }
        let diff = _.difference(Object.keys(model), this.excludedField);
        let modelField = XosFormHelpers.parseModelField(diff);
        this.formField = XosFormHelpers.buildFormStructure(modelField, this.config.fields, model, this.config.order);
      });

    }
  });
})();