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<?php
/**
 * The label component, used to display text.
 *
 * @author Lemmmy
 * @see Component
 */
class ComponentLabel extends Component
{
    /**
     * The directory in which the font files are located.
     */
    const FONT_DIRECTORY = 'fonts/';

    /**
     * fonts/exo2regular.ttf
     */
    const FONT_REGULAR = 'exo2regular.ttf';

    /**
     * fonts/exo2medium.ttf
     */
    const FONT_MEDIUM = 'exo2medium.ttf';

    /**
     * fonts/exo2bold.ttf
     */
    const FONT_BOLD = 'exo2bold.ttf';

    /**
     * fonts/osu!font.ttf
     */
    const FONT_OSU = 'osu!font.ttf';

    /**
     * The text of this label
     *
     * @var string
     */
    private $text;

    /**
     * The font file to use for this label
     *
     * @var string
     */
    private $font;

    /**
     * The colour of the text of the label
     *
     * @var string
     */
    private $colour;

    /**
     * The size of the font of this label
     *
     * @var float
     */
    private $fontSize;

    /*
     * The alignment of this text
     *
     * @var int
     */
    private $textAlignment;

    /**
     * The predefined or calculated width of this label
     *
     * @var int
     */
    private $width;

    /**
     * The actual calculated width of this label
     *
     * @var int
     */
    private $actualWidth;

    /**
     * The predefined or calculated height of this label
     *
     * @var int
     */
    private $height;

    /**
     * The Draw instance for this label, with all data set in the constructor
     *
     * @var ImagickDraw
     */
    private $drawSettings;

    /**
     * Creates a new Label component.
     *
     * @param OsuSignature $signature The base signature
     * @param int $x The X position of this label
     * @param int $y The Y position of this label
     * @param string $text The text of this label
     * @param string $font The font to use for this label; can be a string or the constants defined in {@link ComponentLabel}
     * @param string $colour The colour of the text of the label
     * @param int $fontSize The size of the font of the label
     * @param int $textAlignment The text alignment
     * @param int $width Width of the label, set to -1 to use the text size, anything bigger can be used to spoof the component system. -2 makes the component sizeless
     * @param int $height Height of the label, set to -1 to use the text size, anything bigger can be used to spoof the component system
     */
    public function __construct(
        OsuSignature $signature,
        $x = 0,
        $y = 0,
        $text,
        $font = self::FONT_REGULAR,
        $colour = '#555555',
        $fontSize = 14,
        $textAlignment = Imagick::ALIGN_UNDEFINED,
        $width = -1,
        $height = -1) {

        parent::__construct($signature, $x, $y);

        $this->text = $text;
        $this->font = $font;
        $this->colour = $colour;
        $this->fontSize = $fontSize;
        $this->textAlignment = $textAlignment;
        $this->width = $width;
        $this->height = $height;

        $this->drawSettings = new ImagickDraw();
        $this->drawSettings->setFont(self::FONT_DIRECTORY . $font);
        $this->drawSettings->setFontSize($fontSize);
        $this->drawSettings->setTextAlignment($textAlignment);
        $this->drawSettings->setFillColor($colour);

        $this->usesSpace = $width != -2;

        if ($width <= -1 || $height <= -1) {
            $tempImg = new Imagick();
            $metrics = $tempImg->queryFontMetrics($this->drawSettings, $this->text);
            $this->width = $width <= -1 ? $metrics['textWidth'] : $width;
            // yeah i have to do some bullshit
            $this->actualWidth = $metrics['textWidth'];
            $this->height = $metrics['boundingBox']['y2'] - $this->y;
        }
    }

    public function getWidth() {
        return $this->width;
    }

    public function getActualWidth() {
        return $this->actualWidth;
    }

    public function getHeight() {
        return $this->height;
    }

    public function draw(OsuSignature $signature)
    {
        if (isset($this->text)) {
            $signature->getCanvas()->annotateImage($this->drawSettings, $this->x, $this->y, 0, $this->text);
        }
    }
}