/**
 * Created by robin on 10/24/15.
 */

(function () {
    'use strict';
    angular.module('luticate2Utils')
        .factory('luBusyBusiness', ['$q', function($q) {

            var luBusyBusiness = {};

            luBusyBusiness.groups = null;

            luBusyBusiness.initGroups = function(groups)
            {
                if (typeof groups === 'string') {
                    groups = [groups];
                }

                for (var i = 0; i < groups.length; ++i) {
                    var group = luBusyBusiness.groups[groups[i]];
                    if (group == null ) {
                        group = {
                            count: 0,
                            deferred: null,
                            errors: []
                        };
                        luBusyBusiness.groups[groups[i]] = group;
                    }

                    if (group.count == 0) {
                        group.deferred = $q.defer();
                        group.errors = [];
                    }
                    ++group.count;
                }
            };

            luBusyBusiness.isRunning = function(group)
            {
                var data = luBusyBusiness.groups[group];
                if (data != null) {
                    return data.count > 0;
                }
                return false;
            };

            luBusyBusiness.promise = function(group)
            {
                var data = luBusyBusiness.groups[group];
                if (data != null && data.deferred != null) {
                    return data.deferred.promise;
                }
                return null;
            };

            luBusyBusiness.hasError = function(group)
            {
                var data = luBusyBusiness.groups[group];
                if (data != null) {
                    return data.errors.length != 0;
                }
                return null;
            };

            luBusyBusiness.errors = function(group)
            {
                var data = luBusyBusiness.groups[group];
                if (data != null) {
                    return data.errors;
                }
                return null;
            };

            luBusyBusiness.resolve = function(groups)
            {
                if (typeof groups === 'string') {
                    groups = [groups];
                }
                for (var i = 0; i < groups.length; ++i) {
                    var group = luBusyBusiness.groups[groups[i]];
                    if (group != null) {
                        --group.count;
                        if (group.count == 0) {
                            if (!luBusyBusiness.hasError(group)) {
                                group.deferred.resolve(null);
                            }
                            else {
                                group.deferred.resolve(null);
                            }
                            group.deferred = null;
                        }
                    }
                }
            };

            luBusyBusiness.reject = function(groups, error)
            {
                if (typeof groups === 'string') {
                    groups = [groups];
                }
                for (var i = 0; i < groups.length; ++i) {
                    var group = luBusyBusiness.groups[groups[i]];
                    if (group != null) {
                        --group.count;
                        group.errors.push(error);
                        if (group.count == 0) {
                            group.deferred.resolve(null);
                            group.deferred = null;
                        }
                    }
                }
            };

            luBusyBusiness.reset = function()
            {
                luBusyBusiness.groups = {};
                return luBusyBusiness;
            };

            return luBusyBusiness;
        }]);
})();