<?php
// Single player: 5-question multiple choice quiz, one question per deck.
require_once __DIR__ . '/../lib/bootstrap.php';
$me = require_login();

$QUESTIONS = [
    ['What does WAP stand for?', ['Wireless Application Protocol','Web Access Point','Wide Area Paging','Wireless Audio Player'], 0],
    ['WML is based on which language?', ['HTML','XML','SGML','JSON'], 1],
    ['Which company made the Nokia 7110, the first big WAP phone?', ['Ericsson','Motorola','Nokia','Siemens'], 2],
    ['A WML file is made up of one or more...', ['Pages','Cards','Frames','Slides'], 1],
    ['What year was WAP 1.1 published?', ['1996','1999','2002','2005'], 1],
    ['Default MIME type for WML is text/vnd.wap...?', ['wap','wml','xml','wsp'], 1],
    ['GPRS stands for General Packet Radio...?', ['System','Service','Standard','Stream'], 1],
];

function quiz_load(int $uid): ?array {
    $s = db()->prepare("SELECT * FROM sp_games WHERE user_id=? AND game='quiz'
                        AND status='active' ORDER BY id DESC LIMIT 1");
    $s->execute([$uid]);
    return $s->fetch() ?: null;
}

$msg = '';
$g = quiz_load((int)$me['id']);

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    require_csrf();
    $act = $_POST['act'] ?? '';
    if ($act === 'new' || !$g) {
        if ($g) db()->prepare("UPDATE sp_games SET status='abandoned' WHERE id=?")->execute([$g['id']]);
        $keys = array_keys($QUESTIONS);
        shuffle($keys);
        $keys = array_slice($keys, 0, 5);
        $st = json_encode(['q' => $keys, 'i' => 0, 'right' => 0]);
        $now = time();
        db()->prepare("INSERT INTO sp_games (game,user_id,state,created_at,updated_at)
                       VALUES ('quiz',?,?,?,?)")->execute([$me['id'], $st, $now, $now]);
        $g = quiz_load((int)$me['id']);
        $msg = 'New quiz: 5 questions.';
    } elseif ($act === 'ans') {
        $st = json_decode($g['state'], true);
        $qi = $QUESTIONS[$st['q'][$st['i']]];
        $pick = (int)($_POST['a'] ?? -1);
        if ($pick === (int)$qi[2]) { $st['right']++; $msg = 'Correct!'; }
        else $msg = 'Wrong - it was: ' . $qi[1][$qi[2]];
        $st['i']++;
        if ($st['i'] >= count($st['q'])) {
            $score = $st['right'] * 20;
            db()->prepare("UPDATE sp_games SET status='done', state=?, updated_at=? WHERE id=?")
                ->execute([json_encode($st), time(), $g['id']]);
            db()->prepare("INSERT INTO scores (game,user_id,score,detail,created_at)
                           VALUES ('quiz',?,?,?,?)")
                ->execute([$me['id'], $score, $st['right'] . '/5', time()]);
            $msg .= ' Quiz over: ' . $st['right'] . '/5 correct, score ' . $score . '.';
            $g = null;
        } else {
            db()->prepare("UPDATE sp_games SET state=?, updated_at=? WHERE id=?")
                ->execute([json_encode($st), time(), $g['id']]);
            $g['state'] = json_encode($st);
        }
    }
}

page_start('Quick Quiz', ['back' => '/games.php']);
if ($msg) p_para($msg);

if ($g) {
    $st = json_decode($g['state'], true);
    $qi = $QUESTIONS[$st['q'][$st['i']]];
    p_para('Q' . ($st['i'] + 1) . '/' . count($st['q']) . ': ' . $qi[0]);
    $opts = [];
    foreach ($qi[1] as $k => $lab) $opts[(string)$k] = $lab;
    p_form('/games/quiz.php', [
        ['name' => 'act', 'type' => 'hidden', 'value' => 'ans'],
        ['name' => 'a', 'label' => 'Answer', 'type' => 'select', 'options' => $opts],
    ], 'Answer');
} else {
    p_para('A short quiz about WAP and mobile history. 20 points per correct answer.');
    p_form('/games/quiz.php', [['name' => 'act', 'type' => 'hidden', 'value' => 'new']], 'Start quiz');
}
p_links([['/games/scores.php', 'High scores', ['g' => 'quiz']], ['/games.php', 'Games']]);
page_end();