<?php
// ============================================================
// osrm_routing.php
// Helper functions for OpenStreetMap Routing Machine (OSRM)
// Used to estimate accurate distance (km) and duration (mins)
// ============================================================

/**
 * Get Distance and Duration between two coordinates using public OSRM server.
 * Note: If you host your own OSRM, replace the $osrmBaseUrl.
 * 
 * @param float $startLat
 * @param float $startLng
 * @param float $endLat
 * @param float $endLng
 * @param string $countryCode (e.g. 'JO', 'SY', 'EG')
 * @return array|null Returns ['distance_km' => float, 'duration_min' => float] or null on failure.
 */
function getOsrmRouteDetails($startLat, $startLng, $endLat, $endLng, $countryCode = 'JO') {
    // Intaleq Maps SaaS server handles all countries (Jordan, Syria, Egypt)
    $baseUrl = "https://map-saas.intaleqapp.com/api/maps/route";
    
    $queryParams = http_build_query([
        'fromLat' => $startLat,
        'fromLng' => $startLng,
        'toLat' => $endLat,
        'toLng' => $endLng
    ]);
    
    $url = "{$baseUrl}?{$queryParams}";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5); // 5 seconds timeout
    
    // Add Intaleq API Key Header
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        "x-api-key: in_9478b32836d19cff73db3063"
    ]);

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    if ($httpCode === 200 && $response) {
        $data = json_decode($response, true);
        if (isset($data['distance']) && isset($data['duration'])) {
            $distanceMeters = (float)$data['distance'];
            $durationSeconds = isset($data['trafficAwareDuration']) ? (float)$data['trafficAwareDuration'] : (float)$data['duration'];
            
            return [
                'distance_km' => round($distanceMeters / 1000, 2),
                'duration_min' => round($durationSeconds / 60, 2)
            ];
        }
    }
    
    return null;
}