diff --git a/class/ReportBuilder.php b/class/ReportBuilder.php
index 43d50b7..4e1dc16 100644
--- a/class/ReportBuilder.php
+++ b/class/ReportBuilder.php
@@ -7,7 +7,7 @@ require_once "common_func.php";
 
 class ReportBuilder
 {
-    static private function getStatsByFilters(int $gameid, string $filter, string $groups, string $ordering)
+    static public function getStatsByFilters(int $gameid, string $filter, string $groups, string $ordering)
     {
         $groupMgr = new GroupMgr();
         $testMgr = new TestMgr();
@@ -122,7 +122,7 @@ class Report
     {
         $this->sections[] = $section;
     }
-    
+
     // Generate TeX representation.
     function genTeX() :string
     {
@@ -133,9 +133,13 @@ class Report
         return $tex;
     }
 
-    // Save TeX representation
-    function saveTeX(string $fileName) : void {
-        file_put_contents($fileName, $this->genTeX()); // TODO: cím!!!
+    const CONTENT_FILE = "content.tex";
+    const TITLE_FILE = "title.tex";
+
+    // Save TeX representation.
+    function saveTeX(string $dir) : void {
+        file_put_contents($dir . DIRECTORY_SEPARATOR . self::CONTENT_FILE, $this->genTeX());
+        file_put_contents($dir . DIRECTORY_SEPARATOR . self::TITLE_FILE, $this->title);
     }
 }
 
diff --git a/cli_actions.php b/cli_actions.php
index 744c95e..1ed8da6 100644
--- a/cli_actions.php
+++ b/cli_actions.php
@@ -2,12 +2,12 @@
 
 require_once "class/TestMgr.php";
 
-$longopts = [
+const longopts = [
     "action:", // execute some CLI action
     "tick" // tick timed objects (e.g. timed tests)
 ];
 
-$options = getopt("", $longopts);
+$options = getopt("", longopts);
 
 // CLI actions
 if (isset($options["action"])) {
diff --git a/interface.php b/interface.php
index 2f3736a..488517a 100644
--- a/interface.php
+++ b/interface.php
@@ -233,7 +233,8 @@ function access_test_data(string $testid): Test|null
     return $test;
 }
 
-function exclude_correct_answers(array &$challenges) : void {
+function exclude_correct_answers(array &$challenges): void
+{
     foreach ($challenges as &$challenge) {
         $challenge["correct_answer"] = -1;
     }
@@ -518,8 +519,35 @@ function get_results_by_gameid(ReqHandler &$rh, array $params): array
     return $result;
 }
 
-function generate_report(ReqHandler &$rh, array $params): string {
+function generate_report_by_groups(ReqHandler &$rh, array $params): string
+{
+    global $gameMgr;
+    global $user;
 
+    $gameid = trim($params["gameid"]);
+    $filter = trim($params["filter"]);
+    $ordering = trim($params["orderby"]);
+    $groups = explode_list(trim($params["groups"])); // TODO: lehessen több csoportra is
+
+    $game = $gameMgr->getGame($gameid);
+
+    // verify game and access
+    if (($game === null) || (!$game->isUserContributorOrOwner($user->getNickname()) || $user->hasQuizmasterPrivilege())) {
+        return "FAIL";
+    }
+
+    // assemble report
+    $report = new Report($game->getName());
+    foreach ($groups as $groupname) {
+        $stats = ReportBuilder::getStatsByFilters($gameid, $filter, $groupname, $ordering);
+        $section = new ReportSection($groupname, $stats);
+        $report->addSection($section);
+    }
+
+    // generate latex
+    $report->saveTeX("report/");
+
+    return "OK";
 }
 
 function generate_detailed_game_stats(ReqHandler &$rh, array $params): array
@@ -532,7 +560,8 @@ function generate_detailed_game_stats(ReqHandler &$rh, array $params): array
     return $stats;
 }
 
-function delete_tests(ReqHandler &$rh, array $params): string {
+function delete_tests(ReqHandler &$rh, array $params): string
+{
     global $testMgr;
     $ids = explode_list(trim($params["ids"]));
     foreach ($ids as $id) {
@@ -695,21 +724,24 @@ function get_all_users(ReqHandler &$rh, array $params): array
     return $user_data_filtered;
 }
 
-function get_user_groups(ReqHandler &$rh, array $params): array {
+function get_user_groups(ReqHandler &$rh, array $params): array
+{
     global $groupMgr;
     $groups = $groupMgr->getUserGroupIDs($params["nickname"]);
     $groupMgr->resolveGroupIds($groups);
     return $groups;
 }
 
-function get_game_groups(ReqHandler &$rh, array $params): array {
+function get_game_groups(ReqHandler &$rh, array $params): array
+{
     global $groupMgr;
     $groups = $groupMgr->getGameGroupIDs($params["gameid"]);
     $groupMgr->resolveGroupIds($groups);
     return $groups;
 }
 
-function change_group_members(ReqHandler &$rh, array $params): string {
+function change_group_members(ReqHandler &$rh, array $params): string
+{
     global $groupMgr;
     global $user;
     global $userMgr;
@@ -742,7 +774,7 @@ $rh->add("update_group", ["groupname", "description", "owner", "editors", "id"],
 $rh->add("delete_groups", ["ids"], PRIVILEGE_QUIZMASTER, "delete_groups", RESP_PLAIN, "Delete group.");
 $rh->add("get_all_groups", [], PRIVILEGE_QUIZMASTER, "get_all_groups", RESP_JSON, "Get all player groups.");
 $rh->add("search_groups", ["needle"], PRIVILEGE_QUIZMASTER, "search_groups", RESP_JSON, "Serach and fetch player groups.");
-$rh->add("change_group_members", ["groupid", "add", "remove"], PRIVILEGE_QUIZMASTER,"change_group_members", RESP_PLAIN, "Change group members.");
+$rh->add("change_group_members", ["groupid", "add", "remove"], PRIVILEGE_QUIZMASTER, "change_group_members", RESP_PLAIN, "Change group members.");
 
 $rh->add(["create_user", "update_user"], ["nickname", "password", "realname", "privilege"], PRIVILEGE_QUIZMASTER, "create_update_user", RESP_PLAIN, "Create or update user.");
 $rh->add("delete_users", ["users"], PRIVILEGE_QUIZMASTER, "delete_users", RESP_PLAIN, "Delete users.");