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

try {
    $qBiz = queryOne("SELECT ID, Name, BeaconShardID, BeaconMajor FROM Businesses WHERE ID = ? LIMIT 1", [$bizId]);
    if (!$qBiz) {
        apiAbort(['OK' => false, 'ERROR' => 'invalid_business', 'MESSAGE' => 'Business not found']);
    }

    $shardId = (int) ($qBiz['BeaconShardID'] ?? 0);
    $beaconMajor = (int) ($qBiz['BeaconMajor'] ?? 0);

    // Allocate shard if needed
    if ($shardId <= 0 || $qBiz['BeaconMajor'] === null) {
        $qShard = queryOne("
            SELECT ID, UUID, BusinessCount FROM BeaconShards
            WHERE IsActive = 1 AND BusinessCount < MaxBusinesses
            ORDER BY BusinessCount ASC LIMIT 1
        ", []);

        if (!$qShard) {
            apiAbort(['OK' => false, 'ERROR' => 'no_available_shards', 'MESSAGE' => 'All beacon shards are at capacity']);
        }

        $shardId = (int) $qShard['ID'];

        $qMaxMajor = queryOne("
            SELECT COALESCE(MAX(BeaconMajor), -1) AS MaxMajor FROM Businesses WHERE BeaconShardID = ?
        ", [$shardId]);
        $beaconMajor = (int) $qMaxMajor['MaxMajor'] + 1;

        if ($beaconMajor > 65535) {
            apiAbort(['OK' => false, 'ERROR' => 'shard_full', 'MESSAGE' => 'Shard has reached maximum major value']);
        }

        queryTimed("
            UPDATE Businesses SET BeaconShardID = ?, BeaconMajor = ?
            WHERE ID = ? AND (BeaconShardID IS NULL OR BeaconMajor IS NULL)
        ", [$shardId, $beaconMajor, $bizId]);

        queryTimed("UPDATE BeaconShards SET BusinessCount = BusinessCount + 1 WHERE ID = ?", [$shardId]);
    }

    $qShardUUID = queryOne("SELECT UUID FROM BeaconShards WHERE ID = ?", [$shardId]);

    // Get service point and allocate Minor if needed
    $qSP = queryOne("SELECT ID, BusinessID, Name, BeaconMinor FROM ServicePoints WHERE ID = ? LIMIT 1", [$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']);
    }

    if ($qSP['BeaconMinor'] !== null) {
        $beaconMinor = (int) $qSP['BeaconMinor'];
    } else {
        $qMaxMinor = queryOne("
            SELECT COALESCE(MAX(BeaconMinor), -1) AS MaxMinor FROM ServicePoints WHERE BusinessID = ?
        ", [$bizId]);
        $beaconMinor = (int) $qMaxMinor['MaxMinor'] + 1;

        if ($beaconMinor > 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",
            [$beaconMinor, $spId]);
    }

    jsonResponse([
        'OK' => true,
        'UUID' => $qShardUUID['UUID'],
        'Major' => $beaconMajor,
        'Minor' => $beaconMinor,
        'MeasuredPower' => -100,
        'AdvInterval' => 2,
        'TxPower' => 1,
        'ServicePointName' => $qSP['Name'],
        'BusinessName' => $qBiz['Name'],
    ]);

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