<?php
require_once __DIR__ . '/../helpers.php';
runAuth();

global $businessId;

$data = readJsonBody();
$bizId = $businessId;
if ($bizId <= 0) $bizId = (int) ($data['BusinessID'] ?? 0);
if ($bizId <= 0) {
    apiAbort(['OK' => false, 'ERROR' => 'missing_business_id', 'MESSAGE' => 'BusinessID is required']);
}

$spId = (int) ($data['ServicePointID'] ?? ($_GET['ServicePointID'] ?? 0));
if ($spId <= 0) {
    apiAbort(['OK' => false, 'ERROR' => 'missing_servicepoint_id', 'MESSAGE' => 'ServicePointID is required']);
}

try {
    $qSP = queryOne("SELECT ID, BusinessID, Name, BeaconMinor FROM ServicePoints WHERE ID = ? LIMIT 1", [$spId]);
    if (!$qSP) {
        apiAbort(['OK' => false, 'ERROR' => 'invalid_servicepoint', 'MESSAGE' => 'Service point not found']);
    }
    if ((int) $qSP['BusinessID'] !== $bizId) {
        apiAbort(['OK' => false, 'ERROR' => 'access_denied', 'MESSAGE' => 'Service point does not belong to this business']);
    }

    // Already allocated
    if ($qSP['BeaconMinor'] !== null) {
        jsonResponse([
            'OK' => true,
            'ServicePointID' => $spId,
            'BusinessID' => $bizId,
            'BeaconMinor' => (int) $qSP['BeaconMinor'],
            'ServicePointName' => $qSP['Name'],
            'AlreadyAllocated' => true,
        ]);
    }

    $qMaxMinor = queryOne("
        SELECT COALESCE(MAX(BeaconMinor), -1) AS MaxMinor FROM ServicePoints WHERE BusinessID = ?
    ", [$bizId]);
    $nextMinor = (int) $qMaxMinor['MaxMinor'] + 1;

    if ($nextMinor > 65535) {
        apiAbort(['OK' => false, 'ERROR' => 'business_full', 'MESSAGE' => 'Business has reached maximum service points (65535)']);
    }

    queryTimed("UPDATE ServicePoints SET BeaconMinor = ? WHERE ID = ? AND BeaconMinor IS NULL",
        [$nextMinor, $spId]);

    jsonResponse([
        'OK' => true,
        'ServicePointID' => $spId,
        'BusinessID' => $bizId,
        'BeaconMinor' => $nextMinor,
        'ServicePointName' => $qSP['Name'],
        'AlreadyAllocated' => false,
    ]);

} catch (Exception $e) {
    jsonResponse(['OK' => false, 'ERROR' => 'server_error', 'MESSAGE' => $e->getMessage()]);
}