<?php
/**
 * This class will be able to convert a file into an image.
 * @author JPT
 */
class FileImageConverter {

	/**
	 * @var BoxImage
	 */
	protected $image;

	/**
	 * @var CharColorConverter
	 */
	protected $colorConverter;

	/**
	 * Default constructor
	 * @return void
	 */
	public function __construct() {
		$this->colorConverter = new CharColorConverter();
	}

	/**
	 * Processes the given file, returns the filename of the resulting PNG-File.
	 * @param string $filename
	 * @return void
	 * @throws Exception
	 */
	public function convertFile($filename) {
		if(file_exists($filename) === FALSE) throw new Exception("Invalid filename given!");

			//get file data
		$filesize = filesize($filename);
		$md5 = md5_file($filename);

		$new_filename = "result.png";

		$header = "";
		for($i = 0;$i < 255;$i += 5) {
			$header .= chr($i);
		}
		$header .= chr(0);
		$header .= $filesize;
		$header .= chr(0);
		$header .= $md5;

			//header done, now read the file content
		$content = file_get_contents($filename);

			//get size for the image
		$size = strlen($header) + 1 + $filesize;

			//create and prepare image
		$this->image = new BoxImage($size);
		$this->image->fillImage(0,0,0,127);

			//header first
		$this->addDataToImage($header);

			//magic pixel
		$this->image->setCurrentPixel(0,0,0,127);
		$this->image->movePointer(1);

			//content
		$this->addDataToImage($content);

			//save image
		$this->image->writeToFile($new_filename, 0);

			//clean up
		unset($this->image);
	}

	/**
	 * Converts data and adds it to the image.
	 * @param string $data
	 * @return void
	 */
	protected function addDataToImage($data) {
		try {
			$strlen = strlen($data);
			for($i = 0;$i < $strlen; $i++) {
				$char = substr($data, $i, 1);
					//convert char to color
				list($r, $g, $b) = $this->colorConverter->charToColor($char);
					//set the pixel
				$this->image->setCurrentPixel($r, $g, $b, 0);
					//move the pointer
				$this->image->movePointer(1);
			}

		} catch (Exception $e) {
				//TODO: handle weird shit?
			echo "Caught Exception:\n";
			echo $e;
		}

	}

}
?>