// -- 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 {wpServicesModule} from '../../../angular-modules.ts';

function wpAttachmentsService($q, $timeout, $http, Upload, I18n, NotificationsService) {
  var upload = (workPackage, files) => {
      var uploadPath = workPackage.$links.addAttachment.$link.href;
      var uploads = _.map(files, (file:any) => {
        var options = {
          url: uploadPath,
          fields: {
            metadata: {
              fileName: file.name,
              description: file.description
            }
          },
          file: file
        };
        return Upload.upload(options);
      });

      // notify the user
      var message = I18n.t('js.label_upload_notification', {
        id: workPackage.id,
        subject: workPackage.subject
      });

      var notification = NotificationsService.addWorkPackageUpload(message, uploads);
      var allUploadsDone = $q.defer();
      $q.all(uploads).then(function () {
        $timeout(function () { // let the notification linger for a bit
          NotificationsService.remove(notification);
          allUploadsDone.resolve();
        }, 700);
      }, function (err) {
        allUploadsDone.reject(err);
      });
      return allUploadsDone.promise;
    },

    load = function (workPackage, reload:boolean = false) {
      var path = workPackage.$links.attachments.$link.href,
        attachments = $q.defer();
      $http.get(path, {cache: !reload}).success(function (response) {
        attachments.resolve(response._embedded.elements);
      }).error(function (err) {
        attachments.reject(err);
      });
      return attachments.promise;
    },

    remove = function (fileOrAttachment) {
      var removal = $q.defer();
      if (angular.isObject(fileOrAttachment._links)) {
        var path = fileOrAttachment._links.self.href;
        $http.delete(path).success(function () {
          removal.resolve(fileOrAttachment);
        }).error(function (err) {
          removal.reject(err);
        });
      } else {
        removal.resolve(fileOrAttachment);
      }
      return removal.promise;
    },

    hasAttachments = function (workPackage) {
      var existance = $q.defer();
      load(workPackage).then(function (attachments:any) {
        existance.resolve(attachments.length > 0);
      });
      return existance.promise;
    };

  return {
    upload: upload,
    remove: remove,
    load: load,
    hasAttachments: hasAttachments
  };
}

wpServicesModule.factory('wpAttachments', wpAttachmentsService);