<?php
// Look up a callsign's registered city/province/country from the NXDN.csv
// radio ID database (radiowo.com format: RADIO_ID,CALLSIGN,NAME,CITY,STATE,COUNTRY,REMARKS)
// so configure.php can auto-fill the City/Country fields.
header('Content-Type: application/json; charset=utf-8');

$callsign = isset($_GET['callsign']) ? strtoupper(preg_replace('/[^A-Za-z0-9]/', '', $_GET['callsign'])) : '';
$result = array('found' => false);

$csvFile = '/usr/local/etc/NXDN.csv';
if ($callsign !== '' && is_readable($csvFile)) {
	if (($fh = fopen($csvFile, 'r')) !== false) {
		fgetcsv($fh); // skip header row
		while (($row = fgetcsv($fh)) !== false) {
			if (isset($row[1]) && strtoupper($row[1]) === $callsign) {
				$result['found'] = true;
				$result['city'] = isset($row[3]) ? $row[3] : '';
				$result['state'] = isset($row[4]) ? $row[4] : '';
				$result['country'] = isset($row[5]) ? $row[5] : '';
				break;
			}
		}
		fclose($fh);
	}
}

echo json_encode($result);