<?php
header('Content-Type: application/json');

// URL for the SPC Day 1 Outlook KML data
$spc_kml_url = 'https://www.spc.noaa.gov/products/outlook/day1otlk_cat.kml';

// Fetch the KML file
$kml_content = file_get_contents($spc_kml_url);

if ($kml_content === false) {
    echo json_encode(['error' => 'Failed to fetch SPC data.']);
    exit;
}

// Parse the KML content
$xml = simplexml_load_string($kml_content, "SimpleXMLElement", LIBXML_NOCDATA);
if ($xml === false) {
    echo json_encode(['error' => 'Failed to parse KML data.']);
    exit;
}

// Register the KML namespace
$xml->registerXPathNamespace('kml', 'http://www.opengis.net/kml/2.2');

$features = [];

// Find all Placemarks in the KML
foreach ($xml->xpath('//kml:Placemark') as $placemark) {
    $placemark->registerXPathNamespace('kml', 'http://www.opengis.net/kml/2.2');
    $name = (string)$placemark->name;
    
    // Look for Polygon
    $polygon = $placemark->xpath('.//kml:Polygon');
    if ($polygon && isset($polygon[0]->outerBoundaryIs->LinearRing->coordinates)) {
        $coordinates_str = (string)$polygon[0]->outerBoundaryIs->LinearRing->coordinates;
        $coordinates = parse_coordinates($coordinates_str);
        if (!empty($coordinates)) {
            $features[] = [
                'name' => $name,
                'type' => 'Polygon',
                'coordinates' => $coordinates
            ];
        }
    }
}

echo json_encode($features);

function parse_coordinates($coordinates_str) {
    $coords = [];
    $pairs = explode(' ', trim($coordinates_str));
    foreach ($pairs as $pair) {
        $parts = explode(',', $pair);
        if (count($parts) >= 2) {
            $lon = floatval($parts[0]);
            $lat = floatval($parts[1]);
            // Ensure coordinates are valid
            if (is_finite($lat) && is_finite($lon)) {
                $coords[] = $lon;
                $coords[] = $lat;
            }
        }
    }
    return $coords;
}
?>