<?php
declare(strict_types=1);

require __DIR__ . '/common.php';

$requestId = substr(bin2hex(random_bytes(16)), 0, 32);
$requestMethod = $_SERVER['REQUEST_METHOD'] ?? '';
$userAgent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$clientIp = get_client_ip();
$tsStart = microtime(true);

if (!in_array($clientIp, ALLOWED_IPS, true)) {
    json_exit([
        'error' => 'FORBIDDEN_IP',
        'request_id' => $requestId,
        'client_ip' => $clientIp
    ], 403);
}

$params = ($requestMethod === 'POST') ? $_POST : $_GET;
$token = $params['token'] ?? '';

if (!hash_equals(AUTH_TOKEN, $token)) {
    json_exit([
        'error' => 'FORBIDDEN_TOKEN',
        'request_id' => $requestId
    ], 403);
}

$pdo = db();

if (($params['log'] ?? '') == '1') {
    $limit = isset($params['limit']) ? (int)$params['limit'] : 50;
    $logs = db_logs($pdo, $limit);

    json_exit([
        'request_id' => $requestId,
        'limit' => $limit,
        'count' => count($logs),
        'logs' => $logs
    ]);
}

$cmdRequested = $params['cmd'] ?? 'se';
$cmd = normalize_cmd($cmdRequested);

if ($cmd === 'se') {
    $latest = db_latest($pdo);

    if (!$latest) {
        json_exit([
            'request_id' => $requestId,
            'error' => 'no_latest_data'
        ], 500);
    }

    $ageSeconds = max(0, time() - strtotime((string)$latest['ts']));
    $latestUsage = db_latest_usage($pdo);
    $staleReason = null;
    if ($ageSeconds > 30 && $latestUsage && (int)$latestUsage['tcp_ok'] === 0) {
        $staleReason = (string)($latestUsage['tcp_error'] ?? 'tcp_failed');
    }

    json_exit([
        'request_id' => $requestId,
        'cmd_requested' => 'se',
        'cmd' => $latest['cmd'],
        'ts' => $latest['ts'],
        'meta' => [
            'age_seconds' => $ageSeconds,
            'stale' => $ageSeconds > 30,
            'stale_reason' => $staleReason,
            'latest_tcp' => $latestUsage,
        ],

        'raw_full' => $latest['raw_full'],
        'raw_trim' => $latest['raw_trim'],

        'data' => [
            'boundary' => (int)$latest['boundary'],
            'engine' => (int)$latest['engine'],
            'driving' => (int)$latest['driving'],
            'battery_voltage' => (float)$latest['battery_voltage'],
            'door_fl' => (int)$latest['door_fl'],
            'door_fr' => (int)$latest['door_fr'],
            'door_rl' => (int)$latest['door_rl'],
            'door_rr' => (int)$latest['door_rr'],
            'door_trunk' => (int)$latest['door_trunk'],
            'remote_start_preparing' => (int)$latest['remote_start_preparing'],
            'remote_start_running' => (int)$latest['remote_start_running'],
            'remote_start_remaining' => $latest['remote_start_remaining'],
            'hazard' => (int)$latest['hazard'],
        ]
    ]);
}

if (!in_array($cmd, CONTROL_CMD, true)) {
    json_exit([
        'error' => 'INVALID_CMD',
        'request_id' => $requestId,
        'cmd' => $cmd
    ], 400);
}

if ($requestMethod !== 'POST') {
    json_exit([
        'error' => 'METHOD_NOT_ALLOWED_USE_POST',
        'request_id' => $requestId,
        'cmd' => $cmd
    ], 405);
}

$tcpMs = 0;
$connectMs = 0;
$readMs = 0;
$tcpError = '';
$trimError = '';
$sentBytes = 0;
$receivedBytes = 0;

$rawFull = tcp_request(
    $cmd,
    $tcpMs,
    $connectMs,
    $readMs,
    $tcpError,
    'api_control',
    $requestId,
    $sentBytes,
    $receivedBytes
);
$execMs = (int)round((microtime(true) - $tsStart) * 1000);

if ($rawFull === '') {
    json_exit([
        'request_id' => $requestId,
        'cmd_requested' => $cmdRequested,
        'cmd' => $cmd,
        'ts' => date('Y-m-d H:i:s'),
        'exec_ms' => $execMs,
        'client_ip' => $clientIp,
        'ua' => $userAgent,
        'tcp_ok' => 0,
        'tcp_ms' => $tcpMs,
        'connect_ms' => $connectMs,
        'read_ms' => $readMs,
        'sent_bytes' => $sentBytes,
        'received_bytes' => $receivedBytes,
        'total_bytes' => $sentBytes + $receivedBytes,
        'tcp_error' => ($tcpError !== '' ? $tcpError : 'timeout_or_empty'),
        'error' => 'CONTROL_CMD_SEND_FAILED'
    ], 502);
}

$rawTrim = make_trim($rawFull, $trimError);
$data = ($rawTrim !== '') ? parse_trim($rawTrim) : null;

if ($rawTrim !== '' && $data !== null && is_valid_status_data($data)) {
    db_insert_status(
        $pdo,
        $cmd,
        $rawFull,
        $rawTrim,
        $data
    );
}

json_exit([
    'request_id' => $requestId,
    'cmd_requested' => $cmdRequested,
    'cmd' => $cmd,
    'ts' => date('Y-m-d H:i:s'),
    'exec_ms' => $execMs,
    'client_ip' => $clientIp,
    'ua' => $userAgent,
    'tcp_ok' => 1,
    'tcp_ms' => $tcpMs,
    'connect_ms' => $connectMs,
    'read_ms' => $readMs,
    'sent_bytes' => $sentBytes,
    'received_bytes' => $receivedBytes,
    'total_bytes' => $sentBytes + $receivedBytes,
    'tcp_error' => $tcpError,
    'accepted' => true,
    'ack_only' => ($rawTrim === ''),
    'raw_full' => $rawFull,
    'raw_trim' => $rawTrim,
    'data' => $data
]);