<?php
namespace raphiz\passwordcards;

class RequestUtils
{
    public static function isPost()
    {
        return $_SERVER['REQUEST_METHOD'] == "POST";
    }

    public static function parseSeed()
    {
        if (
            isset($_POST['seed']) &&
            is_numeric($_POST['seed'])
        ) {
            return $_POST['seed'];
        }
        return null;
    }

    public static function parseSpacebarSize()
    {
        if (
            isset($_POST['space-length']) &&
            is_numeric($_POST['space-length']) &&
            $_POST['space-length'] < 8 &&
            $_POST['space-length'] > 0
        ) {
            return $_POST['space-length'];
        }
        return 8;
    }

    public static function parseText()
    {
        if (isset($_POST['msg'])) {
            return substr($_POST['msg'], 0, 20);
        }
        return '';
    }

    public static function parsePrimaryColor()
    {
        if (
            isset($_POST['primaryColor']) &&
            preg_match("/#[0-9a-zA-Z]{6}/", $_POST['primaryColor'])
        ) {
            return $_POST['primaryColor'];
        }
        return '#1ABC9C';
    }

    public static function parseSecondaryColor()
    {
        if (
            isset($_POST['secondaryColor']) &&
            preg_match("/#[0-9a-zA-Z]{6}/", $_POST['secondaryColor'])
        ) {
            return $_POST['secondaryColor'];
        }
        return '#ffffff';
    }

    public static function parseKeyboardLayout()
    {
        if (
            isset($_POST['keyboardlayout']) &&
            preg_match("/qwerty|qwertz/", $_POST['keyboardlayout'])
        ) {
            return strtolower($_POST['keyboardlayout']);
        }
        return 'qwerty';
    }
    public static function parsePattern()
    {
         $pattern = "";

        // With numbers?
        if (self::isChecked('with-numbers')) {
            $pattern .= '0-9';
        }

        // With lower?
        if (self::isChecked('with-lower')) {
            $pattern .= 'a-z';
        }

        // With upper?
        if (self::isChecked('with-upper')) {
            $pattern .= 'A-Z';
        }

        // With symbols?
        if (self::isChecked('with-symbols')) {
            $pattern .= '*-*';
        }

        // With space?
        if (self::isChecked('with-space')) {
            $pattern .= ' ';
        }

        // With others?
        if (self::isChecked('with-other')) {
            if (isset($_POST['other-chars'])) {
                $pattern .= substr($_POST['other-chars'], 0, 20);
            }
        }
        return $pattern;
    }

    private static function isChecked($parameter)
    {
        if (
            isset($_POST[$parameter]) &&
            $_POST[$parameter] === "on"
        ) {
            return true;
        }
        return false;
    }

    public static function preparePdfHeader($length)
    {
        header('Content-Description: File Transfer');
        header('Content-Type: application/pdf');
        header('Content-Disposition: attachment; filename=passwordcard.pdf');
        header('Content-Transfer-Encoding: binary');
        header('Content-Length: ' . $length);
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Expires: 0');
        header('Pragma: public');
    }

}