// -- 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.
// ++

angular
  .module('openproject.workPackages.controllers')
  .controller('WatchersPanelController', WatchersPanelController);

function WatchersPanelController($scope, wpWatchers) {
  var vm = this;

  var fetchWatchers = function(loading) {
    vm.error = false;
    vm.loading = angular.isUndefined(loading);

    wpWatchers.forWorkPackage(vm.workPackage).then(function(users) {
      vm.watching = users.watching;
      vm.available = users.available;

    }, function() {
      vm.watchers = [];
      vm.available = [];
      vm.error = true;

    }).finally(function() {
      vm.loading = false;
    });
  };

  var addWatcher = function(event, watcher) {
    event.stopPropagation();

    watcher.loading = true;
    add(watcher, vm.watching);
    remove(watcher, vm.available);

    wpWatchers.addForWorkPackage(vm.workPackage, watcher).then(function(watcher) {
      $scope.$broadcast('watchers.add.finished', watcher);

    }).finally(function() {
      delete watcher.loading;
    });
  };

  var removeWatcher = function(event, watcher) {
    event.stopPropagation();

    wpWatchers.removeFromWorkPackage(vm.workPackage, watcher).then(function(watcher) {
      remove(watcher, vm.watching);
      add(watcher, vm.available);
    });
  };


  var remove = function(watcher, arr) {
    var idx = _.findIndex(arr, watcher, equality(watcher));

    if (idx > -1) {
      arr.splice(idx, 1);
    }
  };

  var add = function(watcher, arr) {
    var idx = _.findIndex(arr, watcher, equality(watcher));

    if (idx === -1) {
      arr.push(watcher);
    }
  };

  var equality = function(firstElement) {
    return function(secondElement) {
      return firstElement.id === secondElement.id;
    };
  };

  vm.watching = [];
  vm.text = {
    loading: I18n.t('js.watchers.label_loading'),
    loadingError: I18n.t('js.watchers.label_error_loading')
  };
  fetchWatchers();

  $scope.$on('watchers.add', addWatcher);
  $scope.$on('watchers.remove', removeWatcher);

  $scope.$on('workPackageRefreshRequired', function () {
    fetchWatchers();
  });
}