/**
 *      Feature for managing Acedia's user groups. Supports both config- and
 *  database-defined information about group sources. An instance of this
 *  feature is necessary for functioning of Acedia's `UserAPI` methods related
 *  to user groups.
 *      Copyright 2022 Anton Tarasenko
 *------------------------------------------------------------------------------
 * This file is part of Acedia.
 *
 * Acedia 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, version 3 of the License, or
 * (at your option) any later version.
 *
 * Acedia 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 Acedia.  If not, see <https://www.gnu.org/licenses/>.
 */
class Users_Feature extends Feature;

var private /*config*/ bool             useDatabase;
var private /*config*/ string           databaseLink;
var private /*config*/ array<string>    availableUserGroups;

//  List of all available user groups for current config
var private array<Text> loadedUserGroups;
//  `HashTable` (with group name keys) that stores `HashTable`s used as
//  a set data structure (has user id as keys and always `none` as a value).
var private HashTable loadedGroupToUsersMap;

protected function OnEnabled()
{
    _.users._reloadFeature();
}

protected function OnDisabled()
{
    _.users._reloadFeature();
}

protected function SwapConfig(FeatureConfig config)
{
    local Users newConfig;

    newConfig = Users(config);
    if (newConfig == none) {
        return;
    }
    useDatabase         = newConfig.useDatabase;
    databaseLink        = newConfig.databaseLink;
    availableUserGroups = newConfig.localUserGroup;
    LoadLocalData();
}

private final function LoadLocalData()
{
    LoadLocalGroupNames();
    LoadLocalGroupToUserMap();
}

private final function LoadLocalGroupNames()
{
    local int   i, j;
    local bool  isDuplicate;
    local Text  nextUserGroup;

    _.memory.FreeMany(loadedUserGroups);
    loadedUserGroups.length = 0;
    for (i = 0; i < availableUserGroups.length; i += 1)
    {
        isDuplicate = false;
        nextUserGroup = _.text.FromString(availableUserGroups[i]);
        for(j = 0; j < loadedUserGroups.length; j += 1)
        {
            if (loadedUserGroups[j].Compare(nextUserGroup, SCASE_INSENSITIVE))
            {
                isDuplicate = true;
                break;
            }
        }
        if (!isDuplicate)
        {
            loadedUserGroups[loadedUserGroups.length] =
                nextUserGroup.LowerCopy();
        }
        nextUserGroup.FreeSelf();
    }
}

private final function LoadLocalGroupToUserMap()
{
    local int           i, j;
    local Text          newSteamID;
    local HashTable     newPlayerSet;
    local UserGroup     nextGroupConfig;
    local array<string> nextGroupUserArray;

    _.memory.Free(loadedGroupToUsersMap);
    loadedGroupToUsersMap = _.collections.EmptyHashTable();
    class'UserGroup'.static.Initialize();
    //  Go over every group
    for (i = 0; i < loadedUserGroups.length; i += 1)
    {
        nextGroupConfig = UserGroup(
            class'UserGroup'.static.GetConfigInstance(loadedUserGroups[i]));
        if (nextGroupConfig == none)
        {
            //  !!! Log missing group
            continue;
        }
        //  Copy player IDs from `string` array into `HashTable`
        //  that is serving as a set data structure
        newPlayerSet        = _.collections.EmptyHashTable();
        nextGroupUserArray  = nextGroupConfig.user;
        for (j = 0; j < nextGroupUserArray.length; j += 1)
        {
            newSteamID = _.text.FromString(nextGroupUserArray[j]);
            newPlayerSet.SetItem(newSteamID, none);
            newSteamID.FreeSelf();
        }
        loadedGroupToUsersMap.SetItem(loadedUserGroups[i], newPlayerSet);
        newPlayerSet.FreeSelf();
        nextGroupConfig.FreeSelf();
    }
}

private final function SaveLocalData()
{
    local Text              nextGroup, activeConfigName;
    local Users             currentConfig;
    local HashTableIterator iter;

    if (useDatabase)                    return;
    if (loadedGroupToUsersMap == none)  return;

    availableUserGroups.length = 0;
    iter = HashTableIterator(loadedGroupToUsersMap.Iterate());
    while (!iter.HasFinished())
    {
        nextGroup = Text(iter.GetKey());
        if (nextGroup != none)
        {
            availableUserGroups[availableUserGroups.length] =
                nextGroup.ToString();
            nextGroup.FreeSelf();
        }
        iter.Next();
    }
    iter.FreeSelf();
    activeConfigName = GetCurrentConfig();
    if (activeConfigName != none)
    {
        currentConfig = Users(class'Users'.static
            .GetConfigInstance(activeConfigName));
    }
    if (currentConfig != none)
    {
        currentConfig.localUserGroup = availableUserGroups;
        //  !!! save config !!!
    }
    _.memory.Free(currentConfig);
    _.memory.Free(activeConfigName);
}

/**
 *  Returns names of all available groups that users can belong to.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @return Array with names of all available groups.
 *      All array elements are guaranteed to be not-`none`, unique and in
 *      lower case.
 */
public final function array<Text> GetAvailableGroups()
{
    local int           i;
    local array<Text>   result;

    for (i = 0; i < loadedUserGroups.length; i += 1) {
        result[i] = loadedUserGroups[i].Copy();
    }
    return result;
}

/**
 *  Adds a new user group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *      Changes will always persist for the duration of the match, but writing
 *  them into the (non-config) source might fail, leading to changes being reset
 *  after the level switch. For non-database (config) sources changes will
 *  always be saved.
 *
 *  @param  groupName   Name of the group to add. Case-insensitive.
 *  @return `true` if group was added and `false` otherwise (including if it
 *      already existed).
 */
public final function bool AddGroup(BaseText groupName)
{
    local bool      groupExists;
    local Text      lowerCaseGroupName;
    local HashTable newUserSet;

    if (groupName == none) {
        return false;
    }
    lowerCaseGroupName = groupName.LowerCopy();
    groupExists = loadedGroupToUsersMap.HasKey(lowerCaseGroupName);
    if (!groupExists)
    {
        lowerCaseGroupName.FreeSelf();
        return false;
    }
    loadedUserGroups[loadedUserGroups.length] = lowerCaseGroupName;
    //  Try loading local `UserGroup`?
    newUserSet = _.collections.EmptyHashTable();
    loadedGroupToUsersMap.SetItem(lowerCaseGroupName, newUserSet);
    newUserSet.FreeSelf();
    return true;
}

/**
 *  Removes existing user group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *      Changes will always persist for the duration of the match, but writing
 *  them into the (non-config) source might fail, leading to changes being reset
 *  after the level switch. For non-database (config) sources changes will
 *  always be saved.
 *
 *  @param  groupName   Name of the group to remove. Case-insensitive.
 *  @return `true` if group was removed and `false` otherwise (including if it
 *      didn't exist in the first place).
 */
public final function bool RemoveGroup(BaseText groupName)
{
    local int   i;
    local bool  groupExists;
    local Text  lowerCaseGroupName;

    if (groupName == none) {
        return false;
    }
    lowerCaseGroupName = groupName.LowerCopy();
    groupExists = loadedGroupToUsersMap.HasKey(lowerCaseGroupName);
    if (!groupExists)
    {
        lowerCaseGroupName.FreeSelf();
        return false;
    }
    for (i = 0; i < loadedUserGroups.length; i += 1)
    {
        if (lowercaseGroupName.Compare(loadedUserGroups[i]))
        {
            loadedUserGroups.Remove(i, 1);
            break;
        }
    }
    //  Try loading local `UserGroup`?
    loadedGroupToUsersMap.RemoveItem(lowerCaseGroupName);
    lowerCaseGroupName.FreeSelf();
    return true;
}

/**
 *  Checks whether group with specified name exists.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @param  groupName   Name of the group to check existence of.
 *      Case-insensitive.
 *  @return `true` if group exists and `false` otherwise.
 */
public final function bool IsGroupExisting(BaseText groupName)
{
    local bool result;
    local Text lowerCaseGroupName;

    if (groupName == none) {
        return false;
    }
    lowerCaseGroupName = groupName.LowerCopy();
    result = loadedGroupToUsersMap.HasKey(lowerCaseGroupName);
    lowerCaseGroupName.FreeSelf();
    return result;
}

/**
 *  Adds user with the given SteamID into the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  steamID     SteamID of the user to add to the group.
 *  @param  groupName   Name of the group to add user to. Case-insensitive.
 *  @return `true` if user was added to the group (including if her was already
 *      added to it) and `false` in any other case.
 */
public final function bool AddSteamIDToGroup(
    BaseText steamID,
    BaseText groupName)
{
    local Text      lowercaseGroupName;
    local HashTable groupUsers;

    if (loadedGroupToUsersMap == none)  return false;
    if (groupName == none)              return false;

    lowercaseGroupName = groupName.LowerCopy();
    groupUsers = loadedGroupToUsersMap.GetHashTable(lowercaseGroupName);
    lowercaseGroupName.FreeSelf();
    //  No specified group? Nothing to add!
    if (groupUsers == none) {
        return false;
    }
    groupUsers.SetItem(steamID, none);
    groupUsers.FreeSelf();
    return true;
}

/**
 *  Adds user with the given SteamID into the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  steamID     SteamID of the user to add to the group.
 *  @param  groupName   Name of the group to add user to. Case-insensitive.
 *  @return `true` if user was added to the group (including if her was already
 *      added to it) and `false` in any other case.
 */
public final /*unreal*/ function bool AddSteamIDToGroup_S(
    string steamID,
    string groupName)
{
    local bool          result;
    local MutableText   idWrapper, groupWrapper;

    idWrapper       = _.text.FromStringM(steamID);
    groupWrapper    = _.text.FromStringM(groupName);
    result = AddSteamIDToGroup(idWrapper, groupWrapper);
    idWrapper.FreeSelf();
    groupWrapper.FreeSelf();
    return result;
}

/**
 *  Adds user (given by the `UserID`) into the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  id          `UserID` of the user to add to the group.
 *  @param  groupName   Name of the group to add user to. Case-insensitive.
 *  @return `true` if user was added to the group (including if her was already
 *      added to it) and `false` in any other case.
 */
public final function bool AddUserIDToGroup(
    UserID      id,
    BaseText    groupName)
{
    local bool result;
    local Text steamID;

    if (groupName == none)              return false;
    if (id == none)                     return false;
    steamID = id.GetSteamID64String();
    if (steamID == none)                return false;

    result = AddSteamIDToGroup(steamID, groupName);
    steamID.FreeSelf();
    return result;
}

/**
 *  Adds given user into the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  user        User to add to the group.
 *  @param  groupName   Name of the group to add user to. Case-insensitive.
 *  @return `true` if user was added to the group (including if her was already
 *      added to it) and `false` in any other case.
 */
public final function bool AddUserToGroup(User user, BaseText groupName)
{
    local bool      result;
    local UserID    id;

    if (groupName == none)  return false;
    if (user == none)       return false;

    id = user.GetID();
    result = AddUserIDToGroup(id, groupName);
    _.memory.Free(id);
    return result;
}

/**
 *  Removes user with the given SteamID from the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  steamID     SteamID of the user to remove to the group.
 *  @param  groupName   Name of the group to remove user to. Case-insensitive.
 *  @return `true` if user was removed to the group (including if her was
 *      already removed to it) and `false` in any other case.
 */
public final function bool RemoveSteamIDFromGroup(
    BaseText steamID,
    BaseText groupName)
{
    local bool      hadUser;
    local Text      lowercaseGroupName;
    local HashTable groupUsers;

    if (groupName == none)              return false;
    if (loadedGroupToUsersMap == none)  return false;

    lowercaseGroupName = groupName.LowerCopy();
    groupUsers = loadedGroupToUsersMap.GetHashTable(lowercaseGroupName);
    lowercaseGroupName.FreeSelf();
    if (groupUsers == none) {
        return false;
    }
    hadUser = groupUsers.HasKey(steamID);
    groupUsers.RemoveItem(steamID);
    groupUsers.FreeSelf();
    return hadUser;
}

/**
 *  Removes user with the given SteamID from the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  steamID     SteamID of the user to remove to the group.
 *  @param  groupName   Name of the group to remove user to. Case-insensitive.
 *  @return `true` if user was removed to the group (including if her was
 *      already removed to it) and `false` in any other case.
 */
public final /*unreal*/ function bool RemoveSteamIDFromGroup_S(
    string steamID,
    string groupName)
{
    local bool          result;
    local MutableText   idWrapper, groupWrapper;

    idWrapper       = _.text.FromStringM(steamID);
    groupWrapper    = _.text.FromStringM(groupName);
    result = RemoveSteamIDFromGroup(idWrapper, groupWrapper);
    idWrapper.FreeSelf();
    groupWrapper.FreeSelf();
    return result;
}

/**
 *  Removes user (given by the `UserID`) from the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  id          `UserID` of the user to remove to the group.
 *  @param  groupName   Name of the group to remove user to. Case-insensitive.
 *  @return `true` if user was removed to the group (including if her was
 *      already removed to it) and `false` in any other case.
 */
public final function bool RemoveUserIDFromGroup(
    UserID      id,
    BaseText    groupName)
{
    local bool result;
    local Text steamID;

    if (groupName == none)              return false;
    if (id == none)                     return false;
    steamID = id.GetSteamID64String();
    if (steamID == none)                return false;

    result = RemoveSteamIDFromGroup(steamID, groupName);
    steamID.FreeSelf();
    return result;
}

/**
 *  Removes user from the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), changes are guaranteed to be made to the locally
 *  cached copy that will persist for the duration of the game. Method will also
 *  attempt to change the database value, but that is not guaranteed to succeed,
 *  meaning that changes might not be saved for later matches.
 *
 *  @param  user        User to remove to the group.
 *  @param  groupName   Name of the group to remove user to. Case-insensitive.
 *  @return `true` if user was removed to the group (including if her was
 *      already removed to it) and `false` in any other case.
 */
public final function bool RemoveUserFromGroup(User user, BaseText groupName)
{
    local bool      result;
    local UserID    id;

    if (groupName == none)  return false;
    if (user == none)       return false;

    id = user.GetID();
    result = RemoveUserIDFromGroup(id, groupName);
    _.memory.Free(id);
    return result;
}

/**
 *  Returns names of all groups available for the user given by SteamID.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @see `GetGroupsForUserID()` / `GetGroupsForUser()`.
 *
 *  @param  steamID SteamID of the user.
 *      Must be specified in a SteamID64 format, e.g. "76561197960287930".
 *  @return Array with names of the groups of the specified user.
 *      All array elements are guaranteed to be not-`none`, unique and in
 *      lower case.
 *      If passed SteamID is `none` or data wasn't yet loaded - returns empty
 *      array.
 */
public final function array<Text> GetGroupsForSteamID(BaseText steamID)
{
    local Text              immutableSteamID;
    local array<Text>       result;
    local HashTableIterator iter;
    local Text              nextGroup;
    local HashTable         nextGroupUsers;

    if (loadedGroupToUsersMap == none)  return result;
    if (steamID == none)                return result;

    immutableSteamID = steamID.LowerCopy();
    iter = HashTableIterator(loadedGroupToUsersMap.Iterate());
    while (!iter.HasFinished())
    {
        nextGroup       = Text(iter.GetKey());
        nextGroupUsers  = HashTable(iter.Get());
        if (    nextGroup != none && nextGroupUsers != none
            &&  nextGroupUsers.HasKey(steamID))
        {
            result[result.length] = nextGroup.Copy();
        }
        iter.Next();
        _.memory.Free(nextGroup);
        _.memory.Free(nextGroupUsers);
    }
    immutableSteamID.FreeSelf();
    return result;
}

/**
 *  Returns names of all groups available for the user with a SteamID given by
 *  `UserID`.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @see `GetGroupsForUserID()` / `GetGroupsForUser()`.
 *
 *  @param  steamID SteamID of the user.
 *      Must be specified in a SteamID64 format, e.g. "76561197960287930".
 *  @return Array with names of the groups of the specified user.
 *      All array elements are guaranteed to be not-`none`, unique and in
 *      lower case.
 *      If data wasn't yet loaded - returns empty array.
 */
public final /*unreal*/ function array<Text> GetGroupsForSteamID_S(
    string steamID)
{
    local array<Text> result;
    local MutableText wrapper;

    wrapper = _.text.FromStringM(steamID);
    result = GetGroupsForSteamID(wrapper);
    wrapper.FreeSelf();
    return result;
}

/**
 *  Returns names of all groups available for the user given by `UserID`.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @see `GetGroupsForSteamID()` / `GetGroupsForUser()`.
 *
 *  @param  id  ID of the user.
 *  @return Array with names of the groups of the specified user.
 *      All array elements are guaranteed to be not-`none`, unique and in
 *      lower case.
 *      If data wasn't yet loaded - returns empty array.
 */
public final function array<Text> GetGroupsForUserID(UserID id)
{
    local Text          steamID;
    local array<Text>   result;

    if (id == none)                     return result;
    steamID = id.GetSteamID64String();
    if (steamID == none)                return result;

    result = GetGroupsForSteamID(steamID);
    steamID.FreeSelf();
    return result;
}

/**
 *  Returns names of all groups available for the user.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @see `GetGroupsForSteamID()` / `GetGroupsForUserID()`.
 *
 *  @param  user    Reference to `User` object that represent the user we are to
 *      find groups for.
 *  @return Array with names of the groups of the specified user.
 *      All array elements are guaranteed to be not-`none`, unique and in
 *      lower case.
 *      If data wasn't yet loaded - returns empty array.
 */
public final function array<Text> GetGroupsForUser(User user)
{
    local UserID        id;
    local array<Text>   result;

    if (user == none) {
        return result;
    }
    id = user.GetID();
    result = GetGroupsForUserID(id);
    _.memory.Free(id);
    return result;
}

/**
 *  Returns `UserID`s of all users that belong into the group named `groupName`.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @param  groupName   Name of the group. Case-insensitive.
 *  @return Array with `UserID`s for every user in the user group named
 *      `groupName`. All array elements are guaranteed to be not-`none` and
 *      correspond to unique players.
 *      If data wasn't yet loaded - returns empty array.
 */
public final function array<UserID> GetGroupMembers(BaseText groupName)
{
    local int           i;
    local Text          lowerCaseGroupName;
    local HashTable     groupUsers;
    local array<Text>   groupUsersNames;
    local UserID        nextUserID;
    local array<UserID> result;

    if (loadedGroupToUsersMap == none)  return result;
    if (groupName == none)              return result;

    lowerCaseGroupName = groupName.LowerCopy();
    groupUsers = loadedGroupToUsersMap.GetHashTable(lowerCaseGroupName);
    lowerCaseGroupName.FreeSelf();
    if (groupUsers == none) {
        groupUsersNames = groupUsers.GetTextKeys();
    }
    _.memory.Free(groupUsers);
    for (i = 0; i < groupUsersNames.length; i += 1)
    {
        nextUserID = UserID(_.memory.Allocate(class'UserID'));
        nextUserID.Initialize(groupUsersNames[i]);
        if (nextUserID.IsInitialized()) {
            result[result.length] = nextUserID;
        }
        else {
            nextUserID.FreeSelf();
        }
    }
    _.memory.FreeMany(groupUsersNames);
    return result;
}

/**
 *  Checks whether user given by `UserID` belongs to the group named
 *  `groupName`.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @param  id          ID of the user to check.
 *  @param  groupName   Name of the group. Case-insensitive.
 *  @return `true` if user with an ID given by `id` belongs to the group named
 *      `groupName` and false if: it does not, either of the parameters is
 *      invalid or group data wasn't yet properly loaded.
 */
public final function bool IsUserIDInGroup(UserID id, Text groupName)
{
    local bool      result;
    local Text      steamID;
    local Text      lowerGroupName;
    local HashTable nextGroupUsers;

    if (loadedGroupToUsersMap == none)  return false;
    if (groupName == none)              return false;
    if (id == none)                     return false;
    steamID = id.GetSteamID64String();
    if (steamID == none)                return false;

    lowerGroupName = groupName.LowerCopy();
    nextGroupUsers = loadedGroupToUsersMap.GetHashTable(lowerGroupName);
    lowerGroupName.FreeSelf();
    if (nextGroupUsers != none) {
        result = nextGroupUsers.HasKey(steamID);
    }
    _.memory.Free(nextGroupUsers);
    steamID.FreeSelf();
    return result;
}

/**
 *  Checks whether user belongs to the specified group.
 *
 *      In case this feature is configured to load user groups from a database
 *  (either local or remote), the returned value is a locally cached one.
 *  This helps us avoid having to query database each time we want to check
 *  something about user groups, but it also means we might have an outdated
 *  information.
 *
 *  @param  user    Reference to `User` object that represent the user we are to
 *      check for belonging to the group.
 *  @param  groupName   Name of the group. Case-insensitive.
 *  @return `true` if user with an ID given by `id` belongs to the group named
 *      `groupName` and false if: it does not, either of the parameters is
 *      invalid or group data wasn't yet properly loaded.
 */
public final function bool IsUserInGroup(User user, Text groupName)
{
    local UserID    id;
    local bool      result;

    if (user == none) {
        return false;
    }
    id = user.GetID();
    result = IsUserIDInGroup(id, groupName);
    _.memory.Free(id);
    return result;
}

/**
 *  Checks whether user groups' data was already loaded from the source
 *  (either config file or local/remote database).
 *
 *  Data loaded once is cached and this method returning `true` does not
 *  guarantee that is isn't outdated. Additional, asynchronous queries must be
 *  made to check for that.
 *
 *  @return `true` if user groups' data was loaded and `false` otherwise.
 */
public final function bool IsUserGroupDataLoaded()
{
    return true;
}

defaultproperties
{
    configClass = class'Users'
}