<?php
/**
 * QR Code Image
 *
 * @package ValueAce
 * @subpackage content
 */

/**
 * QR Code Image
 *
 * @version 1.3.0
 * @package ValueAce
 */
class WBUte_QRCode extends WBStdClass
{
    /**
     * @var WBFile
     */
    private $file;

    /**
     * @var striong
     */
    private $text;

    /**
     * @var WBConfig
     */
    private $config;

    /**
     * List of Configuration Parameter
     * @var array
     */
    private $configParam    =   array();

    /**
     * Named Cache Folder
     *
     * @var string
     */
    private $cacheDir;

    /**
     * Standard Constructor
     *
     * @param array list of parameter
     */
    public function __construct($params = array())
    {
        $this->file     =   WBClass::create('WBFile');
        $this->config   =   WBClass::create('WBConfig');
        $this->config->load('ute/qrcode/config', true);
        $this->setupCache();
    }

    /**
     * Setup Cache Dir
     *
     */
    private function setupCache()
    {
        if (!WBParam::get('wb/cache/use', true)) {
            return;
        }

        $this->cacheDir =   '/var/cache/qrcode';
        $this->file->mkdir($this->cacheDir);
        $this->file->clear();
    }

    /**
     * Set Config Parameter
     *
     * Allows to override parameter from config file dynamically
     *
     * @param array list of parameter
     */
    public function configure($config = array())
    {
        $this->configParam  =   array_merge($this->configParam, $config);
    }

    /**
     * Set QRCode Text
     *
     * @param string text for QR code
     */
    public function setText($text)
    {
        $text   =   trim($text);
        if ($text == $this->text) {
            return;
        }
        $this->file->unlink();
        $this->text =   $text;
    }

    /**
     * Delete QRCode Image
     *
     */
    public function flush()
    {
        if (empty($this->cacheDir)) {
            $this->file->unlink();
            return;
        }
        $this->file->clear();
    }

    /**
     * Render QRCode Image and Return File
     *
     * @return WBFile
     */
    public function getImage()
    {
        if ($this->file->isFile()) {
            return $this->file;
        }

        $renderer   =   strtolower($this->config->get('qrcode/renderer', 'command'));
        $config     =   $this->config->get('qrcode/config/' . $renderer, array());
        $config     =   array_merge($config, $this->configParam);

        if (empty($this->cacheDir)) {
            $this->file->tempnam('qrcode');
        }
        else {
            $cid        =   md5(serialize($config) . '-text-' . $this->text);
            if ($this->file->exists($this->cacheDir . '/' . $cid)) {
                return $this->file;
            }
            $this->file->touch($this->cacheDir . '/' . $cid);
        }

        switch ($renderer) {
            case 'webservice':
                $this->renderFromWebService($config);
                break;

            default:
            case 'command':
                $this->renderFromCommand($config);
                break;
        }

        return $this->file;
    }

    /**
     * Use Command
     *
     * Use Command-Line-Tool to render QR-Code.
     * Requires Debian Package go-qrcode
     * @param array
     */
    private function renderFromCommand($config)
    {
        $config =   array_merge(array(
                    'size'              =>  800,
                    'blackonwhite'      =>  1,
                    'command'           =>  'qrcode',
                    'border'            =>  1,
                    'hasfeatureborder'  =>  0
                    ), $config);

        $config['blackonwhite'] =   intval($config['blackonwhite']);
        $config['size'] =   intval($config['size']);
        $config['size'] =   max(100, min(2000, $config['size']));

        $cmd    =   array($config['command']);
        if (1 > $config['blackonwhite']) {
            $cmd[]  =   '-i';
        }
        // disable border
        if (0 < $config['hasfeatureborder'] && 1 > intval($config['border'])) {
            $cmd[]  =   '-d';
        }
        $cmd[]  =   '-s ' . $config['size'];
        $cmd[]  =   '%s >%s';
        $cmd    =   implode(' ', $cmd);
        $cmd    =   sprintf($cmd, escapeshellarg($this->text), $this->file->realpath());
        exec($cmd, $out, $ret);
        if (0 < $ret) {
            $this->debugPrint('FAILED to generate QR-Code with command: ' . $cmd, -1);
            $this->debugPrint('Output of command ' . implode("\n", $out), 5);
        }
        else {
            $this->debugPrint('Generate QR-Code with command: ' . $cmd, 5);
        }
    }

    /**
     * Use API
     *
     * Use Web-service to render QR-Code.
     * @param array
     */
    private function renderFromWebService($config)
    {
        $config =   array_merge(array(
                    'size'          =>  800,
                    'url'           =>  'https://api.qrserver.com/v1/create-qr-code/'
                    ), $config);

        $config['size'] =   intval($config['size']);
        $config['size'] =   max(100, min(2000, $config['size']));

        $text   =   urlencode($this->text);
        $png    =   file_get_contents(sprintf('%s?size=%sx%s&data=%s', $config['url'], $config['size'], $config['size'] ,$text));
        file_put_contents($this->file->realpath(), $png);
    }
}