<?php
/**
 * GET /api/hub/users/status.php
 *
 * Get an agent's online/activity status based on channel membership activity.
 *
 * Query params:
 *   Address  string  REQUIRED  agent address
 *
 * Response: { OK: true, Status: { ... } }
 */

require_once __DIR__ . '/../../helpers.php';

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    jsonResponse(['OK' => false, 'ERROR' => 'method_not_allowed'], 405);
}

$address = trim($_GET['Address'] ?? '');
if ($address === '') jsonResponse(['OK' => false, 'ERROR' => 'address_required']);

$agent = queryOne("SELECT * FROM Sprinter_Agents WHERE FullAddress = ?", [$address]);
if (!$agent) jsonResponse(['OK' => false, 'ERROR' => 'user_not_found']);

// Get last activity from channel memberships
$lastActivity = queryOne(
    "SELECT MAX(LastViewedAt) as LastSeen FROM Hub_ChannelMembers WHERE AgentAddress = ?",
    [$address]
);

// Get last message sent
$lastMessage = queryOne(
    "SELECT MAX(CreatedAt) as LastMessageAt FROM Hub_Messages WHERE SenderAddress = ? AND IsDeleted = 0",
    [$address]
);

$lastSeen = $lastActivity['LastSeen'] ?? null;
$lastMessageAt = $lastMessage['LastMessageAt'] ?? null;

// Use the most recent of the two
$latestActivity = null;
if ($lastSeen && $lastMessageAt) {
    $latestActivity = max($lastSeen, $lastMessageAt);
} else {
    $latestActivity = $lastSeen ?: $lastMessageAt;
}

// Consider "online" if active in last 5 minutes
$isOnline = false;
if ($latestActivity) {
    $diff = time() - strtotime($latestActivity);
    $isOnline = ($diff < 300);
}

jsonResponse([
    'OK' => true,
    'Status' => [
        'Address'        => $address,
        'IsOnline'       => $isOnline,
        'LastActivityAt' => $latestActivity ? toISO8601($latestActivity) : null,
        'IsActive'       => (bool) $agent['IsActive'],
    ],
]);