<?php
/**
 * ImgProcess
 * Actual image manipulation
 */
class ImgProcess {
	private $folder; //folder for reading source images and write

	private $canvasName;

	private $zapWidth;//collage dimensions

	private $zapHeight;

	private $maxRGB; //depends on colorDepth. 8 bits: 255; 16 bits : 65536;

	/**
	 * constructor
	 * @param $imgFolder string
	 * @param $width int
	 * @param $height int
	 * @param $nr int
	 */
	public function __construct($imgFolder, $width, $height, $nr) {
		$this->folder = $imgFolder;

		$this->zapWidth = $width;
		$this->zapHeight = $height;

		$this->canvasName = DIRECTORY_SEPARATOR . ZAP_CANVAS_NAME;
		$this->canvasName .= $_SESSION['date'] . "_nr_" . sprintf("%02d", $nr);

		$tmpImg = new Imagick();
		$tmpAr = $tmpImg->getQuantumRange();
		$this->maxRGB = $tmpAr['quantumRangeLong'];
		$tmpImg->destroy();
	}

	/**
	 * Makes a basic canvasFile from sourceImage
	 * and saves it into imageFolder
	 * returns imageBLOB from saved image
	 * @param string $sourceImgName
	 * @return void
	 */
	public function createBasicCanvas($sourceImgName) {
		$canvas = new Imagick($sourceImgName);
		$canvas = ImgTools::zoomCrop($canvas, $this->zapWidth, $this->zapHeight, TRUE);

		ImgIOTools::saveImg($canvas, $this->folder, $this->canvasName);
		if (ZAP_DELETE_SOURCE == true) {
			unlink($sourceImgName);
		}
		ImgIOTools::onScreen($canvas);
	}

	/**
	 * adds processed version of $sourceImage to canvas
	 * @param string $sourceImgName
	 * @return void
	 */
	public function addToCanvas($sourceImgName) {
		$canvasUri = $this->folder . $this->canvasName . '.' . ZAP_IMG_TYPE;
		$canvas = new Imagick($canvasUri);

		$source_im = new Imagick($sourceImgName);

		$newCanvas_im = $this->zapToCanvas($source_im, $canvas);
		ImgIOTools::saveImg($newCanvas_im, $this->folder, $this->canvasName);
		if (ZAP_DELETE_SOURCE == true) {
			unlink($sourceImgName);
		}
		ImgIOTools::onScreen($newCanvas_im);
	}

	/**
	 * @param Imagick $source_im
	 * @param Imagick $canvas
	 * @return Imagick Object
	 */
	private function zapToCanvas(Imagick $source_im, $canvas) {
		//$val = ImgTools::imgCenterValueProm($source_im, $this->maxRGB);

		//merge resized random transparised image on top of canvas
		$transparent = ImgTools::transparantRandom($source_im, $this->maxRGB);
		$resized = ImgTools::resize($transparent, $this->zapWidth, $this->zapHeight);

		$canvas->compositeImage($resized, imagick::COMPOSITE_OVER, 0, 0);
		return $canvas;
	}
}
?>