<?php
declare(strict_types=1);

require_once __DIR__ . '/_player_account.php';

define('PLAYER_LOG_FILE', ADMIN_PRIVATE_DIR . '/player-logs.json');
define('PLAYER_LOG_MAX_EVENTS', 2000);
define('PLAYER_LOG_SESSION_GAP_SEC', 1800); // 30 นาที = session ใหม่

function player_log_default(): array
{
    return [
        'version' => 1,
        'stats' => [
            'totalEvents' => 0,
            'totalVisits' => 0,
            'uniquePlayers' => 0,
            'visitsToday' => 0,
            'todayKey' => '',
        ],
        'players' => [],
        'events' => [],
    ];
}

function player_log_read(): array
{
    if (!is_file(PLAYER_LOG_FILE)) {
        return player_log_default();
    }
    $raw = @file_get_contents(PLAYER_LOG_FILE);
    $j = json_decode($raw ?: '{}', true);
    if (!is_array($j)) {
        return player_log_default();
    }
    return array_replace_recursive(player_log_default(), $j);
}

function player_log_write(array $data): bool
{
    if (!is_dir(ADMIN_PRIVATE_DIR)) {
        if (!@mkdir(ADMIN_PRIVATE_DIR, 0750, true)) {
            return false;
        }
    }
    $tmp = PLAYER_LOG_FILE . '.tmp.' . bin2hex(random_bytes(4));
    $json = json_encode($data, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    if ($json === false) {
        return false;
    }
    if (file_put_contents($tmp, $json, LOCK_EX) === false) {
        return false;
    }
    if (!rename($tmp, PLAYER_LOG_FILE)) {
        @unlink($tmp);
        return false;
    }
    return true;
}

function player_log_today_key(): string
{
    $tz = new DateTimeZone('Asia/Bangkok');
    return (new DateTimeImmutable('now', $tz))->format('Y-m-d');
}

function player_log_reset_today_if_needed(array &$log): void
{
    $today = player_log_today_key();
    if (($log['stats']['todayKey'] ?? '') !== $today) {
        $log['stats']['todayKey'] = $today;
        $log['stats']['visitsToday'] = 0;
    }
}

function player_log_allowed_events(): array
{
    return [
        'login_guest' => true,
        'login_google' => true,
        'login_facebook' => true,
        'lobby_enter' => true,
        'room_enter' => true,
        'game_enter' => true,
        'quiz_battle_enter' => true,
        'logout' => true,
    ];
}

function player_log_sanitize_name(string $raw): string
{
    $s = trim($raw);
    $s = preg_replace('/[\x00-\x1f\x7f]/u', '', $s) ?? '';
    if (function_exists('mb_substr')) {
        return mb_substr($s, 0, 32);
    }
    return substr($s, 0, 32);
}

function player_log_sanitize_page(string $raw): string
{
    $s = trim($raw);
    if (function_exists('mb_substr')) {
        return mb_substr($s, 0, 180);
    }
    return substr($s, 0, 180);
}

/** event ที่นับเป็น "การเข้าใช้งาน" */
function player_log_counts_as_visit(string $event): bool
{
    return isset([
        'login_guest' => true,
        'login_google' => true,
        'login_facebook' => true,
        'lobby_enter' => true,
        'room_enter' => true,
        'game_enter' => true,
    ][$event]);
}

function player_log_track(
    string $playerKey,
    string $event,
    string $displayName = '',
    string $loginType = 'guest',
    string $page = '',
    array $meta = []
): array {
    $allowed = player_log_allowed_events();
    if (!isset($allowed[$event])) {
        return ['ok' => false, 'error' => 'unknown event'];
    }
    if (!valid_player_key($playerKey)) {
        return ['ok' => false, 'error' => 'invalid playerKey'];
    }

    $lt = in_array($loginType, ['guest', 'google', 'facebook', 'email'], true) ? $loginType : 'guest';
    $name = player_log_sanitize_name($displayName);
    $page = player_log_sanitize_page($page);
    $now = gmdate('c');
    $nowTs = time();

    $log = player_log_read();
    player_log_reset_today_if_needed($log);

    if (!isset($log['players']) || !is_array($log['players'])) {
        $log['players'] = [];
    }
    if (!isset($log['events']) || !is_array($log['events'])) {
        $log['events'] = [];
    }

    $isNewPlayer = !isset($log['players'][$playerKey]);
    if ($isNewPlayer) {
        $log['players'][$playerKey] = [
            'playerKey' => $playerKey,
            'displayName' => $name !== '' ? $name : 'ผู้เล่น',
            'loginType' => $lt,
            'visitCount' => 0,
            'eventCount' => 0,
            'firstSeenAt' => $now,
            'lastSeenAt' => $now,
            'lastVisitAt' => null,
            'lastEvent' => $event,
            'lastPage' => $page,
        ];
        $log['stats']['uniquePlayers'] = count($log['players']);
    }

    $p = &$log['players'][$playerKey];
    if ($name !== '') {
        $p['displayName'] = $name;
    }
    $p['loginType'] = $lt;
    $p['lastSeenAt'] = $now;
    $p['lastEvent'] = $event;
    if ($page !== '') {
        $p['lastPage'] = $page;
    }
    $p['eventCount'] = max(0, (int) ($p['eventCount'] ?? 0)) + 1;

    $countVisit = false;
    if (player_log_counts_as_visit($event)) {
        $lastVisitAt = isset($p['lastVisitAt']) ? strtotime((string) $p['lastVisitAt']) : false;
        if ($lastVisitAt === false || ($nowTs - $lastVisitAt) >= PLAYER_LOG_SESSION_GAP_SEC) {
            $countVisit = true;
            $p['visitCount'] = max(0, (int) ($p['visitCount'] ?? 0)) + 1;
            $p['lastVisitAt'] = $now;
            $log['stats']['totalVisits'] = max(0, (int) ($log['stats']['totalVisits'] ?? 0)) + 1;
            $log['stats']['visitsToday'] = max(0, (int) ($log['stats']['visitsToday'] ?? 0)) + 1;
        }
    }

    $log['stats']['totalEvents'] = max(0, (int) ($log['stats']['totalEvents'] ?? 0)) + 1;

    $ev = [
        'id' => bin2hex(random_bytes(8)),
        'at' => $now,
        'playerKey' => $playerKey,
        'displayName' => (string) ($p['displayName'] ?? ''),
        'loginType' => $lt,
        'event' => $event,
        'page' => $page,
        'meta' => is_array($meta) ? $meta : [],
        'countedVisit' => $countVisit,
    ];
    array_unshift($log['events'], $ev);
    if (count($log['events']) > PLAYER_LOG_MAX_EVENTS) {
        $log['events'] = array_slice($log['events'], 0, PLAYER_LOG_MAX_EVENTS);
    }

    if (!player_log_write($log)) {
        return ['ok' => false, 'error' => 'บันทึก log ไม่สำเร็จ'];
    }

    return [
        'ok' => true,
        'countedVisit' => $countVisit,
        'visitCount' => (int) ($p['visitCount'] ?? 0),
    ];
}

function player_log_public_summary(array $log): array
{
    player_log_reset_today_if_needed($log);
    return [
        'totalEvents' => max(0, (int) ($log['stats']['totalEvents'] ?? 0)),
        'totalVisits' => max(0, (int) ($log['stats']['totalVisits'] ?? 0)),
        'uniquePlayers' => max(0, (int) ($log['stats']['uniquePlayers'] ?? count($log['players'] ?? []))),
        'visitsToday' => max(0, (int) ($log['stats']['visitsToday'] ?? 0)),
        'todayKey' => (string) ($log['stats']['todayKey'] ?? player_log_today_key()),
        'eventCap' => PLAYER_LOG_MAX_EVENTS,
        'storedEvents' => count($log['events'] ?? []),
    ];
}

function player_log_players_list(array $log, string $search = '', int $limit = 200): array
{
    $rows = [];
    foreach ($log['players'] ?? [] as $p) {
        if (!is_array($p)) {
            continue;
        }
        $key = (string) ($p['playerKey'] ?? '');
        if ($key === '') {
            continue;
        }
        if ($search !== '') {
            $hay = strtolower($key . ' ' . ($p['displayName'] ?? '') . ' ' . ($p['loginType'] ?? ''));
            if (strpos($hay, strtolower($search)) === false) {
                continue;
            }
        }
        $rows[] = [
            'playerKey' => $key,
            'displayName' => (string) ($p['displayName'] ?? 'ผู้เล่น'),
            'loginType' => (string) ($p['loginType'] ?? 'guest'),
            'visitCount' => max(0, (int) ($p['visitCount'] ?? 0)),
            'eventCount' => max(0, (int) ($p['eventCount'] ?? 0)),
            'firstSeenAt' => (string) ($p['firstSeenAt'] ?? ''),
            'lastSeenAt' => (string) ($p['lastSeenAt'] ?? ''),
            'lastVisitAt' => (string) ($p['lastVisitAt'] ?? ''),
            'lastEvent' => (string) ($p['lastEvent'] ?? ''),
            'lastPage' => (string) ($p['lastPage'] ?? ''),
        ];
    }
    usort($rows, static function ($a, $b) {
        return strcmp((string) ($b['lastSeenAt'] ?? ''), (string) ($a['lastSeenAt'] ?? ''));
    });
    if ($limit > 0 && count($rows) > $limit) {
        $rows = array_slice($rows, 0, $limit);
    }
    return $rows;
}

function player_log_events_list(array $log, array $opts = []): array
{
    $search = trim((string) ($opts['search'] ?? ''));
    $event = trim((string) ($opts['event'] ?? ''));
    $playerKey = trim((string) ($opts['playerKey'] ?? ''));
    $limit = max(1, min(500, (int) ($opts['limit'] ?? 100)));
    $offset = max(0, (int) ($opts['offset'] ?? 0));

    $rows = [];
    foreach ($log['events'] ?? [] as $ev) {
        if (!is_array($ev)) {
            continue;
        }
        if ($event !== '' && ($ev['event'] ?? '') !== $event) {
            continue;
        }
        if ($playerKey !== '' && ($ev['playerKey'] ?? '') !== $playerKey) {
            continue;
        }
        if ($search !== '') {
            $hay = strtolower(
                ($ev['playerKey'] ?? '') . ' ' .
                ($ev['displayName'] ?? '') . ' ' .
                ($ev['event'] ?? '') . ' ' .
                ($ev['page'] ?? '')
            );
            if (strpos($hay, strtolower($search)) === false) {
                continue;
            }
        }
        $rows[] = $ev;
    }
    $total = count($rows);
    if ($offset > 0) {
        $rows = array_slice($rows, $offset);
    }
    if (count($rows) > $limit) {
        $rows = array_slice($rows, 0, $limit);
    }
    return ['rows' => $rows, 'total' => $total];
}