(function(){
    "use strict";
    angular.module('shared')
        .provider('groups', function () {
            var groups;
            return {
                $get: ['$q', 'serverGroups', '_', groupsFactory],
                setGroups: setGroups,
            }

            function groupsFactory($q, serverGroups, _) {
                initGroups();
                return {
                    get: get,
                    add: add,
                    update: update,
                    remove: remove,
                    nameAvailable: nameAvailable,
                    findGroupByName: findGroupByName,
                    findGroupById: findGroupById
                }

                function initGroups() {
                    if (angular.isDefined(groups)) {
                        groups.$promise = $q.resolve(groups);
                    } else {
                        groups = serverGroups.query();
                    }
                }

                function indexOfGroupById(group) {
                    var index;
                    for (index = 0; index < groups.length; ++index) {
                        if (groups[index].grouping_id == group.grouping_id) {
                            return index;
                        }
                    }
                    return -1;
                }

                function get() {
                    return groups;
                }

                function add(group) {
                    return serverGroups.save(group, function (result) {
                        groups.push(result);
                    });
                }

                function update(group) {
                    return serverGroups.update(group, function (result) {
                        var idx = indexOfGroupById(group);
                        if (-1 != idx) {
                            angular.extend(groups[idx], result);
                        }
                    });
                }

                function remove(group) {
                    return serverGroups.remove(group, {id: group.grouping_id}, function () {
                        var idx = indexOfGroupById(group);
                        if (-1 != idx) {
                            group.is_deleted = true;
                            groups.splice(idx, 1);
                        }
                    });
                }

                function findGroupByName(name, exceptGroup) {
                    var searchGroups = exceptGroup === undefined
                        ? groups
                        : _.reject(groups, function (group) {
                            return group == exceptGroup;
                        });

                    if (name.toUpperCase() === "ALL") {
                        return false;
                    }
                    return _.find(searchGroups, function (group) {
                        return group.grouping_name.toUpperCase() === name.toUpperCase();
                    })
                }

                function findGroupById(id) {
                    return _.find(groups, function (group) {
                        return group.grouping_id == id;
                    })
                }

                function nameAvailable(name, exceptGroup) {
                    var foundGroup = findGroupByName(name, exceptGroup);
                    return foundGroup == null;
                }
            }

            function setGroups(src) {
                groups = src;
            }
        })
})();