<?php

require_once "globals.php";
require_once "common_func.php";

require_once "gamemgr.php";
require_once "usermgr.php";

$testdb = new \SleekDB\Store(TESTDB, DATADIR, ["timeout" => false]);

const TEST_ONGOING = "ongoing";
const TEST_CONCLUDED = "concluded";

function create_or_continue_test(string $gameid, string $nickname): string
{
    global $testdb;

    // get game and user data
    $game_data = get_game($gameid);
    $user_data = get_user($nickname);
    if ((count($game_data) === 0) || (count($user_data) === 0)) {
        return "";
    }

    // check if this user has permission to take this test
    // if the intersection of user's groups and game's assigned groups is zero, then the user has no access to this game
    if (count(array_intersect($game_data["groups"], $user_data["groups"])) === 0) {
        return "";
    }

    // check if the user had taken this test before
    $fetch_criteria = [["gameid", "=", $gameid], "AND", ["nickname", "=", $nickname]];
    $previous_tests = $testdb->findBy($fetch_criteria);
    if (count($previous_tests) > 0) { // if there are previous attempts, then...
        // update timed tests to see if they had expired
        update_timed_tests($previous_tests);

        // re-fetch tests, look only for ongoing
        $ongoing_tests = $testdb->findBy([$fetch_criteria, "AND", ["state", "=", TEST_ONGOING]]);
        if (count($ongoing_tests) !== 0) { // if there's an ongoing test
            return $ongoing_tests[0]["_id"];
        } else { // there's no ongoing test
            if ($game_data["properties"]["repeatable"]) { // test is repeatable...
                return create_test($game_data, $user_data);
            } else { // test is non-repeatable, cannot be attempted more times
                return "";
            }
        }
    } else { // there were no previous attempts
        return create_test($game_data, $user_data);
    }
}

function create_test(array $game_data, array $user_data) : string
{
    $gameid = $game_data["_id"];

    // fill basic data
    $game_data = [
        "gameid" => $gameid,
        "nickname" => $user_data["nickname"],
    ];

    // fill challenges
    $challenges = load_challenges($gameid);

    // shuffle answers
    foreach ($challenges as &$ch) {
        shuffle($ch["answers"]);
    }

    $game_data["challenges"] = $challenges;

    // involve properties
}

function update_timed_tests(array $test_data_array)
{
    $now = time();
    foreach ($test_data_array as $test_data) {
        // look for unprocessed expired tests
        if (($test_data["state"] === TEST_ONGOING) && ($test_data["end_limit_time"] < $now)) {
            $test_data["state"] = TEST_CONCLUDED;
            update_test($test_data);
        }
    }
}

function update_test(array $test_data)
{
    global $testdb;
    $testdb->update($test_data);
}