<?php
// Single player: guess the number 1-100, state persisted in sp_games.
require_once __DIR__ . '/../lib/bootstrap.php';
$me = require_login();

function guess_load(int $uid): ?array {
    $s = db()->prepare("SELECT * FROM sp_games WHERE user_id=? AND game='guess'
                        AND status='active' ORDER BY id DESC LIMIT 1");
    $s->execute([$uid]);
    return $s->fetch() ?: null;
}
function guess_new(int $uid): array {
    $st = json_encode(['n' => random_int(1, 100), 'tries' => 0, 'log' => []]);
    $now = time();
    db()->prepare("INSERT INTO sp_games (game,user_id,state,created_at,updated_at)
                   VALUES ('guess',?,?,?,?)")->execute([$uid, $st, $now, $now]);
    return guess_load($uid);
}

$msg = ''; $done = false;
$g = guess_load((int)$me['id']);

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    require_csrf();
    if (($_POST['act'] ?? '') === 'new') {
        if ($g) db()->prepare("UPDATE sp_games SET status='abandoned' WHERE id=?")->execute([$g['id']]);
        $g = guess_new((int)$me['id']);
        $msg = 'New game! Guess a number between 1 and 100.';
    } else {
        if (!$g) $g = guess_new((int)$me['id']);
        $st = json_decode($g['state'], true);
        $gv = (int)($_POST['guess'] ?? 0);
        if ($gv < 1 || $gv > 100) {
            $msg = 'Enter a number from 1 to 100.';
        } else {
            $st['tries']++;
            $st['log'][] = $gv;
            if ($gv === (int)$st['n']) {
                $score = max(1, 110 - 10 * (int)$st['tries']);
                db()->prepare("UPDATE sp_games SET status='won', state=?, updated_at=? WHERE id=?")
                    ->execute([json_encode($st), time(), $g['id']]);
                db()->prepare("INSERT INTO scores (game,user_id,score,detail,created_at)
                               VALUES ('guess',?,?,?,?)")
                    ->execute([$me['id'], $score, $st['tries'] . ' tries', time()]);
                $msg = "Correct! $gv was the number, in {$st['tries']} tries. Score: $score";
                $done = true; $g = null;
            } else {
                $msg = $gv . ' is too ' . ($gv < (int)$st['n'] ? 'LOW' : 'HIGH')
                     . '. Tries: ' . $st['tries'];
                db()->prepare("UPDATE sp_games SET state=?, updated_at=? WHERE id=?")
                    ->execute([json_encode($st), time(), $g['id']]);
                $g['state'] = json_encode($st);
            }
        }
    }
}

page_start('Guess the Number', ['back' => '/games.php']);
if ($msg) p_para($msg);
if ($g) {
    $st = json_decode($g['state'], true);
    if ($st['log']) p_para('Previous: ' . implode(', ', array_slice($st['log'], -8)));
    p_form('/games/guess.php', [
        ['name' => 'guess', 'label' => 'Your guess (1-100)', 'maxlength' => 3,
         'format' => '*N'],
    ], 'Guess');
} else {
    if (!$done) p_para('Guess the secret number between 1 and 100. Fewer tries = more points.');
}
p_form('/games/guess.php', [
    ['name' => 'act', 'type' => 'hidden', 'value' => 'new'],
], $g ? 'Restart' : 'New game');
p_links([['/games/scores.php', 'High scores', ['g' => 'guess']], ['/games.php', 'Games']]);
page_end();