// -- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
// ++

import {ErrorResource} from "../api/api-v3/hal-resources/error-resource.service";

export class WorkPackageEditFormController {
  public workPackage;
  public errorHandler:Function;
  public successHandler:Function;
  public fields = {};
  public firstActiveField:string;

  public lastErrorFields:string[] = [];

  /** Edit all state */
  protected editAllState:boolean = false;

  constructor(
    protected $scope:ng.IScope,
    protected $q,
    protected $state,
    protected $rootScope,
    protected I18n,
    protected NotificationsService,
    protected QueryService,
    protected loadingIndicator) {
  }

  public isFieldRequired(fieldName) {
    return _.filter((this.fields as any), (name:string, _field) => {
      return !this.workPackage[name] && this.workPackage.requiredValueFor(name);
    });
  }

  public registerField(field) {
    this.fields[field.fieldName] = field;
    field.setErrorState(this.lastErrorFields.indexOf(field.fieldName) !== -1);
  }

  public toggleEditMode(state: boolean) {
    if (this.editAllState !== state) {
      this.editAllState = state;

      angular.forEach(this.fields, (field) => {
        if (state) {
          field.isEditable && field.expandField();
        } else {
          field.active && field.reset();
        }
      });
    }
  }

  public get inEditMode() {
    return this.editAllState;
  }

  public get isEditable() {
    return this.workPackage.isEditable;
  }

  public loadSchema() {
    return this.workPackage.getSchema();
  }

  public updateWorkPackage() {
    var deferred = this.$q.defer();

    // Reset old error notifcations
    this.$rootScope.$emit('notifications.clearAll');
    this.lastErrorFields = [];

    this.workPackage.save()
      .then(() => {
        angular.forEach(this.fields, field => field.setErrorState(false));
        deferred.resolve();

        this.showSaveNotification();
        this.successHandler({ workPackage: this.workPackage, fields: this.fields });
      })
      .catch((error) => {
        if (!(error.data instanceof ErrorResource)) {
          this.NotificationsService.addError("An internal error has occcurred.");
          return deferred.reject([]);
        }
        error.data.showErrorNotification();
        this.handleSubmissionErrors(error.data, deferred);
      });

    return deferred.promise;
  }

  private showSaveNotification() {
    var message = 'js.notice_successful_' + (this.workPackage.inlineCreated ? 'create' : 'update');
    this.NotificationsService.addSuccess({
      message: this.I18n.t(message),
      link: {
        target: _ => {
          this.loadingIndicator.mainPage = this.$state.go.apply(this.$state,
            ["work-packages.show.activity", { workPackageId: this.workPackage.id }]);
        },
        text: this.I18n.t('js.work_packages.message_successful_show_in_fullscreen')
      }
    });
  }

  private handleSubmissionErrors(error:any, deferred:any) {

    // Process single API errors
    this.handleErroneousAttributes(error.getInvolvedAttributes());
    return deferred.reject();
  }

  private handleErroneousAttributes(attributes:string[]) {
    if (attributes.length === 0) return;

    // Allow additional error handling
    this.errorHandler({
      workPackage: this.workPackage,
      fields: this.fields,
      attributes: attributes
    });

    // Save erroneous fields for when new fields appear
    this.lastErrorFields = attributes;

    this.$scope.$evalAsync(() => {
      angular.forEach(this.fields, field => {
        field.setErrorState(attributes.indexOf(field.fieldName) !== -1);
      });

      // Activate + Focus on first field
      this.firstActiveField = attributes[0];

      // Activate that field
      // TODO: For inplace-edit, this may be undefined
      // since it doesn't yet expand erroneous attributes
      var firstErrorField = this.fields[this.firstActiveField];
      if (firstErrorField) {
        firstErrorField.activate(true);
      }
    });
  }
}

function wpEditForm() {
  return {
    restrict: 'A',

    scope: {
      workPackage: '=wpEditForm',
      errorHandler: '&wpEditFormOnError',
      successHandler: '&wpEditFormOnSave'
    },

    controller: WorkPackageEditFormController,
    controllerAs: 'vm',
    bindToController: true
  };
}

//TODO: Use 'openproject.wpEdit' module
angular
  .module('openproject')
  .directive('wpEditForm', wpEditForm);