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<?php
/**
 * Created by PhpStorm.
 * User: mxgel
 * Date: 11/14/16
 * Time: 2:33 AM
 */

namespace Knox\Pesapal\OAuth;


/**
 * Class OAuthUtil
 *
 * @package Knox\Pesapal\OAuth
 */
class OAuthUtil
{
    /**
     * @param $input
     *
     * @return array|mixed|string
     */
    public static function urlencode_rfc3986($input)
    {
        if (is_array($input)) {
            return array_map([
                self::class,
                'urlencode_rfc3986',
            ], $input);
        } else {
            if (is_scalar($input)) {
                return str_replace(
                    '+',
                    ' ',
                    str_replace('%7E', '~', rawurlencode($input))
                );
            } else {
                return '';
            }
        }
    }


    // This decode function isn't taking into consideration the above
    // modifications to the encoding process. However, this method doesn't
    // seem to be used anywhere so leaving it as is.
    /**
     * @param $string
     *
     * @return string
     */
    public static function urldecode_rfc3986($string)
    {
        return urldecode($string);
    }

    // Utility function for turning the Authorization: header into
    // parameters, has to do some unescaping
    // Can filter out any non-oauth parameters if needed (default behaviour)
    /**
     * @param      $header
     * @param bool $only_allow_oauth_parameters
     *
     * @return array
     */
    public static function split_header($header, $only_allow_oauth_parameters = true)
    {
        $pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
        $offset = 0;
        $params = [];
        while (preg_match($pattern, $header, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
            $match = $matches[0];
            $header_name = $matches[2][0];
            $header_content = (isset($matches[5])) ? $matches[5][0] : $matches[4][0];
            if (preg_match('/^oauth_/', $header_name) || !$only_allow_oauth_parameters) {
                $params[$header_name] = OAuthUtil::urldecode_rfc3986($header_content);
            }
            $offset = $match[1] + strlen($match[0]);
        }

        if (isset($params['realm'])) {
            unset($params['realm']);
        }

        return $params;
    }

    // helper to try to sort out headers for people who aren't running apache
    /**
     * @return array|false
     */
    public static function get_headers()
    {
        if (function_exists('apache_request_headers')) {
            // we need this to get the actual Authorization: header
            // because apache tends to tell us it doesn't exist
            return apache_request_headers();
        }
        // otherwise we don't have apache and are just going to have to hope
        // that $_SERVER actually contains what we need
        $out = [];
        foreach ($_SERVER as $key => $value) {
            if (substr($key, 0, 5) == "HTTP_") {
                // this is chaos, basically it is just there to capitalize the first
                // letter of every word that is not an initial HTTP and strip HTTP
                // code from przemek
                $key = str_replace(
                    " ",
                    "-",
                    ucwords(strtolower(str_replace("_", " ", substr($key, 5))))
                );
                $out[$key] = $value;
            }
        }

        return $out;
    }

    // This function takes a input like a=b&a=c&d=e and returns the parsed
    // parameters like this
    // array('a' => array('b','c'), 'd' => 'e')
    /**
     * @param $input
     *
     * @return array
     */
    public static function parse_parameters($input)
    {
        if (!isset($input) || !$input) {
            return [];
        }

        $pairs = split('&', $input);

        $parsed_parameters = [];
        foreach ($pairs as $pair) {
            $split = split('=', $pair, 2);
            $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
            $value = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : '';

            if (isset($parsed_parameters[$parameter])) {
                // We have already recieved parameter(s) with this name, so add to the list
                // of parameters with this name

                if (is_scalar($parsed_parameters[$parameter])) {
                    // This is the first duplicate, so transform scalar (string) into an array
                    // so we can add the duplicates
                    $parsed_parameters[$parameter] = [$parsed_parameters[$parameter]];
                }

                $parsed_parameters[$parameter][] = $value;
            } else {
                $parsed_parameters[$parameter] = $value;
            }
        }

        return $parsed_parameters;
    }

    /**
     * @param $params
     *
     * @return string
     */
    public static function build_http_query($params)
    {
        if (!$params) {
            return '';
        }

        // Urlencode both keys and values
        $keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
        $values = OAuthUtil::urlencode_rfc3986(array_values($params));
        $params = array_combine($keys, $values);

        // Parameters are sorted by name, using lexicographical byte value ordering.
        // Ref: Spec: 9.1.1 (1)
        uksort($params, 'strcmp');

        $pairs = [];
        foreach ($params as $parameter => $value) {
            if (is_array($value)) {
                // If two or more parameters share the same name, they are sorted by their value
                // Ref: Spec: 9.1.1 (1)
                natsort($value);
                foreach ($value as $duplicate_value) {
                    $pairs[] = $parameter . '=' . $duplicate_value;
                }
            } else {
                $pairs[] = $parameter . '=' . $value;
            }
        }
        // For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
        // Each name-value pair is separated by an '&' character (ASCII code 38)
        return implode('&', $pairs);
    }
}