(function() {
  'use strict';

  /**
   * @name User
   * @constructor
   * @param {object} [userData] - some default values for the user
   */
  function User(userData) {
    if (userData) {
      this.init(userData);
    }
  }

  /**
   * @memberof User
   * @desc The factory we'll use to register with Angular.
   * @return the User constructor
   */
  User.factory = ['$q', '$log', 'sgSettings', 'Resource', 'Gravatar', function($q, $log, Settings, Resource, Gravatar) {
    angular.extend(User, {
      $q: $q,
      $log: $log,
      $$resource: new Resource(Settings.activeUser('folderURL'), Settings.activeUser()),
      $gravatar: Gravatar,
      $query: '',
      $users: []
    });

    return User;
  }];

  /**
   * @module SOGo.Common
   * @desc Factory registration of User in Angular module.
   */
  angular.module('SOGo.Common').factory('User', User.factory);

  /**
   * @memberof User
   * @desc Search for users that match a string.
   * @param {string} search - a string used to performed the search
   * @param {object[]} excludedUsers - a list of User objects that must be excluded from the results
   * @return a promise of an array of matching User objects
   */
  User.$filter = function(search, excludedUsers) {
    var param = {search: search};
    var _this = this;

    if (!search) {
      // No query specified
      User.$users = [];
      return User.$q.when(User.$users);
    }
    if (User.$query == search) {
      // Query hasn't changed
      return User.$q.when(User.$users);
    }
    User.$query = search;

    return User.$$resource.fetch(null, 'usersSearch', param).then(function(response) {
      var results, index, user,
          compareUids = function(data) {
            return _this.uid == data.uid;
          };
      if (excludedUsers) {
        // Remove excluded users from response
        results = _.filter(response.users, function(data) {
          return !_.find(excludedUsers, compareUids, user);
        });
      }
      else {
        results = response.users;
      }
      // Remove users that no longer match the search query
      for (index = User.$users.length - 1; index >= 0; index--) {
        user = User.$users[index];
        if (!_.find(results, compareUids, user)) {
          User.$users.splice(index, 1);
        }
      }
      // Add new users matching the search query
      _.each(results, function(data, index) {
        if (_.isUndefined(_.find(User.$users, compareUids, data))) {
          var user = new User(data);
          User.$users.splice(index, 0, user);
        }
      });
      User.$log.debug(User.$users);
      return User.$users;
    });
  };

  /**
   * @function init
   * @memberof User.prototype
   * @desc Extend instance with required attributes and new data.
   * @param {object} data - attributes of user
   */
  User.prototype.init = function(data) {
    angular.extend(this, data);
    if (!this.$$shortFormat)
      this.$$shortFormat = this.$shortFormat();
    if (!this.$$image)
      this.$$image = this.image || User.$gravatar(this.c_email);

    // An empty attribute to trick md-autocomplete when adding users from the ACLs editor
    this.empty = ' ';
  };

  /**
   * @function $shortFormat
   * @memberof User.prototype
   * @return the fullname along with the email address
   */
  User.prototype.$shortFormat = function(options) {
    var fullname = this.cn || this.c_email;
    var email = this.c_email;
    var no_email = options && options.email === false;
    if (!no_email && email && fullname != email) {
      fullname += ' <' + email + '>';
    }
    return fullname;
  };

  /**
   * @function $acl
   * @memberof User.prototype
   * @desc Fetch the user rights associated to a specific folder and populate the 'rights' attribute.
   * @param {string} the folder ID
   * @return a promise
   */
  User.prototype.$acl = function(folderId) {
    var _this = this,
        deferred = User.$q.defer(),
        param = {uid: this.uid};
    if (this.$shadowRights) {
      deferred.resolve(this.rights);
    }
    else {
      User.$$resource.fetch(folderId, 'userRights', param).then(function(data) {
        _this.rights = data;
        // Convert numbers (0|1) to boolean values
        //angular.forEach(_.keys(_this.rights), function(key) {
        //  _this.rights[key] = _this.rights[key] ? true : false;
        //});
        // console.debug('rights ' + _this.uid + ' => ' + JSON.stringify(data, undefined, 2));
        // Keep a copy of the server's version
        _this.$shadowRights = angular.copy(data);
        deferred.resolve(data);
        return data;
      });
    }
    return deferred.promise;
  };

  /**
   * @function $isAnonymous
   * @memberof User.prototype
   * @return true if it's the special anonymous user
   */
  User.prototype.$isAnonymous = function() {
    return this.uid == 'anonymous';
  };

  /**
   * @function $isSpecial
   * @memberof User.prototype
   * @desc Only accurate from the ACL editor.
   * @return true if the user is not a regular system user
   */
  User.prototype.$isSpecial = function() {
    return this.userClass && this.userClass == 'public-user';
  };

  /**
   * @function $confirmRights
   * @memberof User.prototype
   * @desc Check if a confirmation is required before giving some rights.
   * @return the confirmation message or false if no confirmation is required
   */
  User.prototype.$confirmRights = function() {
    var confirmation = false;

    if (this.$confirmation) {
      // Don't bother the user more than once
      return false;
    }

    if (_.some(_.values(this.rights))) {
      if (this.uid == 'anonymous') {
        confirmation = l('Potentially anyone on the Internet will be able to access your folder, even if they do not have an account on this system. Is this information suitable for the public Internet?');
      }
      else if (this.uid == '<default>') {
        confirmation = l('Any user with an account on this system will be able to access your folder. Are you certain you trust them all?');
      }
    }

    this.$confirmation = confirmation;

    return confirmation;
  };

  /**
   * @function $rightsAreDirty
   * @memberof User.prototype
   * @return whether or not the rights have changed from their initial values
   */
  User.prototype.$rightsAreDirty = function() {
    return this.rights && !_.isEqual(this.rights, this.$shadowRights);
  };

  /**
   * @function $resetRights
   * @memberof User.prototype
   * @desc Restore initial rights or disable all rights
   * @param {boolean} [zero] - reset all rights to zero when true
   */
  User.prototype.$resetRights = function(zero) {
    var _this = this;
    if (zero) {
      // Disable all rights
      _.map(_.keys(this.rights), function(key) {
        if (angular.isString(_this.rights[key]))
          _this.rights[key] = 'None';
        else
          _this.rights[key] = 0;
      });
    }
    else {
      // Restore initial rights
      this.rights = angular.copy(this.$shadowRights);
    }
  };

  /**
   * @function $folders
   * @memberof User.prototype
   * @desc Retrieve the list of folders of a specific type
   * @param {string} type - either 'contact' or 'calendar'
   * @return a promise of the HTTP query result or the cached result
   */
  User.prototype.$folders = function(type) {
    var _this = this,
        deferred = User.$q.defer(),
        param = {type: type};
    if (this.$$folders) {
      deferred.resolve(this.$$folders);
    }
    else {
      User.$$resource.userResource(this.uid).fetch(null, 'foldersSearch', param).then(function(response) {
        _this.$$folders = response.folders;
        deferred.resolve(response.folders);
      });
    }
    return deferred.promise;
  };

  /**
   * @function $omit
   * @memberof User.prototype
   * @desc Return a sanitized object used to send to the server.
   * @return an object literal copy of the User instance
   */
  User.prototype.$omit = function() {
    var user = {};
    angular.forEach(this, function(value, key) {
      if (key != 'constructor' && key[0] != '$') {
        user[key] = value;
      }
    });
    return user;
  };

  User.prototype.toString = function() {
    return '[User ' + this.c_email + ']';
  };

})();
