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

$data = readJsonBody();
$beaconId = (int) ($data['BeaconID'] ?? 0);

if ($beaconId <= 0) {
    apiAbort(['OK' => false, 'ERROR' => 'missing_beacon_id', 'MESSAGE' => 'BeaconID is required']);
}

$qBeacon = queryOne("
    SELECT ID, Name, UUID, BusinessID FROM Beacons
    WHERE ID = ? AND IsActive = 1 LIMIT 1
", [$beaconId]);

if (!$qBeacon) {
    apiAbort(['OK' => false, 'ERROR' => 'not_found', 'MESSAGE' => 'Beacon not found or inactive']);
}

// Get businesses assigned to this beacon (via service points or join table)
$qAssignments = queryTimed("
    SELECT sp.BusinessID, sp.ID AS ServicePointID, biz.Name AS BusinessName,
           biz.ParentBusinessID, sp.Name AS ServicePointName
    FROM ServicePoints sp
    INNER JOIN Businesses biz ON biz.ID = sp.BusinessID
    WHERE sp.BeaconID = ? AND sp.IsActive = 1

    UNION

    SELECT lt.BusinessID, 0 AS ServicePointID, biz.Name AS BusinessName,
           biz.ParentBusinessID, '' AS ServicePointName
    FROM lt_BeaconsID_BusinessesID lt
    INNER JOIN Businesses biz ON biz.ID = lt.BusinessID
    WHERE lt.BeaconID = ?
      AND lt.BusinessID NOT IN (
        SELECT sp2.BusinessID FROM ServicePoints sp2
        WHERE sp2.BeaconID = ? AND sp2.IsActive = 1
      )

    ORDER BY ParentBusinessID IS NULL DESC, BusinessName ASC
", [$beaconId, $beaconId, $beaconId]);

// Check if any assigned business is a parent
$parentBusinessID = 0;
foreach ($qAssignments as $a) {
    $childCount = queryOne("
        SELECT COUNT(*) AS cnt FROM Businesses WHERE ParentBusinessID = ?
    ", [(int) $a['BusinessID']]);
    if ($childCount && (int) $childCount['cnt'] > 0) {
        $parentBusinessID = (int) $a['BusinessID'];
        break;
    }
}

$businesses = [];

if ($parentBusinessID > 0) {
    $qParent = queryOne("
        SELECT Name, HeaderImageExtension FROM Businesses WHERE ID = ?
    ", [$parentBusinessID]);

    $qChildren = queryTimed("
        SELECT ID, Name, ParentBusinessID, HeaderImageExtension
        FROM Businesses WHERE ParentBusinessID = ? ORDER BY Name ASC
    ", [$parentBusinessID]);

    $firstAssignment = $qAssignments[0] ?? [];
    foreach ($qChildren as $child) {
        $businesses[] = [
            'BusinessID' => (int) $child['ID'],
            'Name' => $child['Name'],
            'ServicePointID' => (int) ($firstAssignment['ServicePointID'] ?? 0),
            'ServicePointName' => $firstAssignment['ServicePointName'] ?? '',
            'IsParent' => false,
            'ParentBusinessID' => $parentBusinessID,
        ];
    }
} else {
    foreach ($qAssignments as $a) {
        $businesses[] = [
            'BusinessID' => (int) $a['BusinessID'],
            'Name' => $a['BusinessName'],
            'ServicePointID' => (int) $a['ServicePointID'],
            'ServicePointName' => $a['ServicePointName'],
            'IsParent' => empty($a['ParentBusinessID']) || (int) $a['ParentBusinessID'] === 0,
        ];
    }
}

$response = [
    'OK' => true,
    'ERROR' => '',
    'BEACON' => [
        'BeaconID' => (int) $qBeacon['ID'],
        'Name' => $qBeacon['Name'],
        'UUID' => $qBeacon['UUID'],
    ],
    'BUSINESSES' => $businesses,
    'BUSINESS' => $businesses[0] ?? (object) [],
    'SERVICEPOINT' => !empty($businesses) ? [
        'ServicePointID' => $businesses[0]['ServicePointID'],
        'Name' => $businesses[0]['ServicePointName'],
        'IsActive' => true,
    ] : (object) [],
];

if ($parentBusinessID > 0) {
    $response['PARENT'] = [
        'BusinessID' => $parentBusinessID,
        'Name' => $qParent['Name'] ?? '',
        'HeaderImageExtension' => trim($qParent['HeaderImageExtension'] ?? ''),
    ];
}

jsonResponse($response);