<?php
function pexels_key() {
    $k = getenv('PEXELS_KEY');
    return $k && strlen($k) > 0 ? $k : 'Vc99rnmOhHhJAbgGQoKLZtsaIVfkeownoQNbTj78VemUjKh08ZYRbf18';
}

function pexels_get($url) {
    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HTTPHEADER => [ 'Authorization: '. pexels_key() ],
        CURLOPT_TIMEOUT => 15,
    ]);
    $resp = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    if ($code >= 200 && $code < 300 && $resp) {
        return json_decode($resp, true);
    }
    return null;
}

function download_to($srcUrl, $destPath) {
    if (!is_dir(dirname($destPath))) {
        if (!mkdir(dirname($destPath), 0775, true)) {
            return false;
        }
    }

    $ch = curl_init($srcUrl);
    $fp = fopen($destPath, 'wb');
    if (!$fp) {
        curl_close($ch);
        return false;
    }

    curl_setopt($ch, CURLOPT_FILE, $fp);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 60);
    $result = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    fclose($fp);

    if ($result && $http_code >= 200 && $http_code < 300) {
        return $destPath;
    }

    if (file_exists($destPath)) {
        unlink($destPath);
    }
    return false;
}