<?php

namespace DynamicOOOS\Mpdf;

use Psr\Log\LoggerInterface;
use DynamicOOOS\Mpdf\Log\Context as LogContext;
use DynamicOOOS\Mpdf\PsrLogAwareTrait\PsrLogAwareTrait;
class SizeConverter implements \Psr\Log\LoggerAwareInterface
{
    use PsrLogAwareTrait;
    private $dpi;
    private $defaultFontSize;
    /**
     * @var \Mpdf\Mpdf
     */
    private $mpdf;
    public function __construct($dpi, $defaultFontSize, Mpdf $mpdf, LoggerInterface $logger)
    {
        $this->dpi = $dpi;
        $this->defaultFontSize = $defaultFontSize;
        $this->mpdf = $mpdf;
        $this->logger = $logger;
    }
    /**
     * Depends of maxsize value to make % work properly. Usually maxsize == pagewidth
     * For text $maxsize = $fontsize
     * Setting e.g. margin % will use maxsize (pagewidth) and em will use fontsize
     *
     * @param mixed $size
     * @param mixed $maxsize
     * @param mixed $fontsize
     * @param mixed $usefontsize Set false for e.g. margins - will ignore fontsize for % values
     *
     * @return float Final size in mm
     */
    public function convert($size = 5, $maxsize = 0, $fontsize = \false, $usefontsize = \true)
    {
        $size = \trim(\strtolower($size));
        $res = \preg_match('/^(?P<size>[-0-9.,]+([eE]\\-?[0-9]+)?)?(?P<unit>[%a-z-]+)?$/', $size, $parts);
        if (!$res) {
            // ignore definition
            $this->logger->warning(\sprintf('Invalid size representation "%s"', $size), ['context' => LogContext::CSS_SIZE_CONVERSION]);
        }
        $unit = !empty($parts['unit']) ? $parts['unit'] : null;
        $size = !empty($parts['size']) ? (float) $parts['size'] : 0.0;
        switch ($unit) {
            case 'mm':
                // do nothing
                break;
            case 'cm':
                $size *= 10;
                break;
            case 'pt':
                $size *= 1 / Mpdf::SCALE;
                break;
            case 'rem':
                $size *= $this->mpdf->default_font_size / Mpdf::SCALE;
                break;
            case '%':
                if ($fontsize && $usefontsize) {
                    $size *= $fontsize / 100;
                } else {
                    $size *= $maxsize / 100;
                }
                break;
            case 'in':
                // mm in an inch
                $size *= 25.4;
                break;
            case 'pc':
                // PostScript picas
                $size *= 38.1 / 9;
                break;
            case 'ex':
                // Approximates "ex" as half of font height
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 0.5);
                break;
            case 'em':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 1);
                break;
            case 'thin':
                $size = 1 * (25.4 / $this->dpi);
                break;
            case 'medium':
                $size = 3 * (25.4 / $this->dpi);
                // Commented-out dead code from legacy method
                // $size *= $this->multiplyFontSize($fontsize, $maxsize, 1);
                break;
            case 'thick':
                $size = 5 * (25.4 / $this->dpi);
                // 5 pixel width for table borders
                break;
            case 'xx-small':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 0.7);
                break;
            case 'x-small':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 0.77);
                break;
            case 'small':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 0.86);
                break;
            case 'large':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 1.2);
                break;
            case 'x-large':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 1.5);
                break;
            case 'xx-large':
                $size *= $this->multiplyFontSize($fontsize, $maxsize, 2);
                break;
            case 'px':
            default:
                $size *= 25.4 / $this->dpi;
                break;
        }
        return $size;
    }
    private function multiplyFontSize($fontsize, $maxsize, $ratio)
    {
        if ($fontsize) {
            return $fontsize * $ratio;
        }
        return $maxsize * $ratio;
    }
}
