<?php
/** GET /api/geocode.php?zip=02763 — US ZIP centroid lookup for the manual campus search. */
declare(strict_types=1);

require_once __DIR__ . '/lib/bootstrap.php';
require_once __DIR__ . '/lib/Validator.php';
require_once __DIR__ . '/lib/RateLimit.php';
require_once __DIR__ . '/lib/Geocode.php';

Api::requireMethod('GET');

$ip = Api::clientIp();
$rl = RateLimit::hit(RateLimit::ipBucket('geocode', $ip), 40, 600);
if (!$rl['allowed']) {
    Api::json(['ok' => false, 'error' => 'Too many searches. Please wait a moment.'], 429, ['Retry-After' => (string)$rl['retryAfter']]);
}

$zip = isset($_GET['zip']) ? preg_replace('/\D/', '', (string)$_GET['zip']) : '';
$zip = substr((string)$zip, 0, 5);
if (strlen($zip) !== 5) {
    Api::json(['ok' => false, 'error' => 'Enter a 5-digit ZIP code.'], 400);
}

$loc = Geocode::zip($zip);
if (!$loc) {
    Api::json(['ok' => false, 'error' => "We couldn't find that ZIP. Try another or pick a campus below."], 200);
}
Api::json(['ok' => true, 'location' => $loc], 200, ['Cache-Control' => 'public, max-age=86400']);