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<?php
/**
 * Generates an error image to die with.
 *
 * @author Lemmmy
 */
class ErrorImage
{
    /**
     * The canvas to draw to.
     *
     * @var Imagick
     */
    private $canvas;

    /**
     * Initializes an error image.
     */
    public function __construct() {
        $this->canvas = new\Imagick();
    }

    /**
     * Generates and dies with an image containing the heading and the text of the error.
     *
     * @param string $headingText The heading of the error.
     * @param string $errorText The text of the error.
     */
    public function generate($headingText, $errorText) {
        $draw = new ImagickDraw();

        $draw->setFillColor('#777777');
        $draw->setFontSize(15);

        $draw->setFont('fonts/exo2bold.ttf');
        $headingMetrics = $this->canvas->queryFontMetrics($draw, $headingText);

        $draw->setFont('fonts/exo2regular.ttf');
        $textMetrics = $this->canvas->queryFontMetrics($draw, $errorText);

        $this->canvas->newImage(
            max($textMetrics['textWidth'], $headingMetrics['textWidth']) + 6,
            $textMetrics['textHeight'] + $headingMetrics['textHeight'] + 6,
            new ImagickPixel('transparent'));

        $this->canvas->annotateImage($draw, 3, $headingMetrics['textHeight'] * 2, 0, $errorText);

        $draw->setFont('fonts/exo2bold.ttf');
        $draw->setFillColor('#333333');
        $draw->setGravity(Imagick::GRAVITY_NORTH);

        $this->canvas->annotateImage($draw, 3, 3, 0, $headingText);

        $this->canvas->setImageFormat('png');

        header('Content-Type: image/'.$this->canvas->getImageFormat());

        header("Cache-Control: max-age=60");
        header("Expires: ".gmdate("D, d M Y H:i:s", time()+60)." GMT");

        die($this->canvas);
    }
}