<?php

/*
 * This file is part of the 2amigos/yii2-qrcode-component project.
 *
 * (c) 2amigOS! <http://2amigos.us/>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Da\QrCode\Writer;

use BaconQrCode\Renderer\Image\Eps;
use BaconQrCode\Writer;
use Da\QrCode\Contracts\QrCodeInterface;

class EpsWriter extends AbstractWriter
{
    /**
     * EpsWriter constructor.
     */
    public function __construct()
    {
        parent::__construct(new Eps());
    }

    /**
     * @inheritdoc
     */
    public function writeString(QrCodeInterface $qrCode)
    {
        /** @var Eps $renderer */
        $renderer = $this->renderer;
        $renderer->setWidth($qrCode->getSize());
        $renderer->setHeight($qrCode->getSize());
        $renderer->setMargin(0);
        $renderer->setForegroundColor($this->convertColor($qrCode->getForegroundColor()));
        $renderer->setBackgroundColor($this->convertColor($qrCode->getBackgroundColor()));
        $writer = new Writer($renderer);
        $string = $writer->writeString(
            $qrCode->getText(),
            $qrCode->getEncoding(),
            $this->convertErrorCorrectionLevel($qrCode->getErrorCorrectionLevel())
        );
        $string = $this->addMargin($string, $qrCode);

        return $string;
    }

    /**
     * @inheritdoc
     */
    public function getContentType()
    {
        return 'image/eps';
    }

    /**
     * @param string          $string
     * @param QrCodeInterface $qrCode
     *
     * @return string
     */
    protected function addMargin($string, QrCodeInterface $qrCode)
    {
        $targetSize = $qrCode->getSize() + $qrCode->getMargin() * 2;
        $lines = explode("\n", $string);
        $sourceBlockSize = 0;
        $additionalWhitespace = $qrCode->getSize();
        foreach ($lines as $line) {
            if (preg_match('#[0-9]+ [0-9]+ [0-9]+ [0-9]+ F#i', $line) && strpos(
                    $line,
                    $qrCode->getSize() . ' ' . $qrCode->getSize() . ' F'
                ) === false) {
                $parts = explode(' ', $line);
                $sourceBlockSize = $parts[2];
                $additionalWhitespace = min($additionalWhitespace, $parts[0]);
            }
        }
        $blockCount = ($qrCode->getSize() - 2 * $additionalWhitespace) / $sourceBlockSize;
        $targetBlockSize = $qrCode->getSize() / $blockCount;
        foreach ($lines as &$line) {
            if (strpos($line, 'BoundingBox') !== false) {
                $line = '%%BoundingBox: 0 0 ' . $targetSize . ' ' . $targetSize;
            } elseif (strpos($line, $qrCode->getSize() . ' ' . $qrCode->getSize() . ' F') !== false) {
                $line = '0 0 ' . $targetSize . ' ' . $targetSize . ' F';
            } elseif (preg_match('#[0-9]+ [0-9]+ [0-9]+ [0-9]+ F#i', $line)) {
                $parts = explode(' ', $line);
                $parts[0] = $qrCode->getMargin(
                    ) + $targetBlockSize * ($parts[0] - $additionalWhitespace) / $sourceBlockSize;
                $parts[1] = $qrCode->getMargin(
                    ) + $targetBlockSize * ($parts[1] - $sourceBlockSize - $additionalWhitespace) / $sourceBlockSize;
                $parts[2] = $targetBlockSize;
                $parts[3] = $targetBlockSize;
                $line = implode(' ', $parts);
            }
        }
        $string = implode("\n", $lines);

        return $string;
    }
}