Calcul distance Cergy

<?php

/**

 * Green Multitech — Calcul de distance routière depuis Cergy (gratuit, sans clé API)

 * À coller dans WPCode > Ajouter un extrait > PHP Snippet > "Exécuter partout"

 */

define('GMT_CERGY_LAT', 49.0361);

define('GMT_CERGY_LON', 2.0761);

add_action('rest_api_init', function () {

    register_rest_route('gmt/v1', '/distance', [

        'methods'  => 'GET',

        'callback' => 'gmt_get_distance_from_cergy',

        'permission_callback' => '__return_true',

        'args' => [

            'city' => ['required' => true],

            'lat'  => ['required' => false],

            'lon'  => ['required' => false],

        ],

    ]);

});

function gmt_slugify_city($value) {

    return sanitize_title(remove_accents(strtolower(trim($value))));

}

function gmt_nominatim_search($query) {

    $url = 'https://nominatim.openstreetmap.org/search?' . http_build_query([

        'q'              => $query,

        'format'         => 'json',

        'countrycodes'   => 'fr',

        'limit'          => 5,

        'addressdetails' => 1,

    ]);

    $response = wp_remote_get($url, [

        'headers' => ['User-Agent' => 'GreenMultitechDistanceTool/1.0 ([email protected])'],

        'timeout' => 8,

    ]);

    if (is_wp_error($response)) return null;

    $body = json_decode(wp_remote_retrieve_body($response), true);

    return is_array($body) ? $body : [];

}

function gmt_osrm_distance_km($lat1, $lon1, $lat2, $lon2) {

    $url = sprintf(

        'https://router.project-osrm.org/route/v1/driving/%F,%F;%F,%F?overview=false',

        $lon1, $lat1, $lon2, $lat2

    );

    $response = wp_remote_get($url, ['timeout' => 8]);

    if (is_wp_error($response)) return null;

    $body = json_decode(wp_remote_retrieve_body($response), true);

    if (empty($body['routes'][0]['distance'])) return null;

    return $body['routes'][0]['distance'] / 1000;

}

function gmt_get_distance_from_cergy(WP_REST_Request $request) {

    $city = sanitize_text_field($request->get_param('city'));

    $lat  = $request->get_param('lat');

    $lon  = $request->get_param('lon');

    if (empty($city)) {

        return new WP_Error('missing_city', 'Ville manquante.', ['status' => 400]);

    }

    // Cas 1 : l'utilisateur a choisi une ville dans une liste de désambiguïsation

    // -> on a déjà lat/lon, pas besoin de re-géocoder.

    if ($lat && $lon) {

        $cache_key = 'gmt_dist_' . gmt_slugify_city($city . '-' . $lat . '-' . $lon);

        $cached = get_option($cache_key);

        if ($cached) { $cached['cached'] = true; return rest_ensure_response($cached); }

        $km = gmt_osrm_distance_km(GMT_CERGY_LAT, GMT_CERGY_LON, (float) $lat, (float) $lon);

        if ($km === null) {

            return new WP_Error('routing_failed', "Impossible de calculer la distance routière.", ['status' => 502]);

        }

        $result = ['city' => $city, 'distance_km' => round($km, 1), 'cached' => false];

        update_option($cache_key, $result, false);

        return rest_ensure_response($result);

    }

    // Cas 2 : simple recherche par nom de ville

    $cache_key = 'gmt_dist_' . gmt_slugify_city($city);

    $cached = get_option($cache_key);

    if ($cached && empty($cached['ambiguous'])) {

        $cached['cached'] = true;

        return rest_ensure_response($cached);

    }

    $results = gmt_nominatim_search($city . ', France');

    if (empty($results)) {

        return new WP_Error('city_not_found', "Ville introuvable. Vérifiez l'orthographe.", ['status' => 404]);

    }

    // On privilégie les résultats de type "ville/village" pour éviter le bruit

    // (quartiers, rues, etc.) avant de proposer une désambiguïsation.

    $place_types = ['city', 'town', 'village', 'municipality', 'hamlet'];

    $filtered = array_values(array_filter($results, function ($r) use ($place_types) {

        return in_array($r['type'] ?? '', $place_types, true);

    }));

    if (count($filtered) >= 1) $results = $filtered;

    if (count($results) > 1) {

        $options = array_map(function ($r) {

            return ['label' => $r['display_name'], 'lat' => $r['lat'], 'lon' => $r['lon']];

        }, array_slice($results, 0, 5));

        $result = ['ambiguous' => true, 'options' => $options];

        update_option($cache_key, $result, false);

        return rest_ensure_response($result);

    }

    $lat = (float) $results[0]['lat'];

    $lon = (float) $results[0]['lon'];

    $km  = gmt_osrm_distance_km(GMT_CERGY_LAT, GMT_CERGY_LON, $lat, $lon);

    if ($km === null) {

        return new WP_Error('routing_failed', "Impossible de calculer la distance routière.", ['status' => 502]);

    }

    $result = [

        'city'          => $city,

        'matched_label' => $results[0]['display_name'],

        'distance_km'   => round($km, 1),

        'cached'        => false,

    ];

    update_option($cache_key, $result, false);

    return rest_ensure_response($result);

}