<?php

class Filter
{
	/**
	 * @var resource
	 */
	
	private $image;
	
	/**
	 * Directory for image assets.
	 * @var string
	 */
	
	private $assetDirectory;

	/**
	 * run constructor
	 * @param resource &$image GD image resource
	 */
	
	public function __construct(&$image)
	{
		$this->image = $image;
		
		$this->assetDirectory = dirname(dirname(dirname(__FILE__))) . '/assets/';
	}
	
	/**
	 * Get the current image resource
	 * 
	 * @return resource
	 */
	
	public function getImage()
	{
		return $this->image;
	}

	public function bubbles()
	{
		$dest = imagecreatefromjpeg($this->assetDirectory . "pattern4.jpg");

		$x = imagesx($this->image);
		$y = imagesy($this->image);

		$x2 = imagesx($dest);
		$y2 = imagesy($dest);

		$thumb = imagecreatetruecolor($x, $y);
		imagecopyresampled($thumb, $dest, 0, 0, 0, 0, $x, $y, $x2, $y2);

		imagecopymerge($this->image, $thumb, 0, 0, 0, 0, $x, $y, 20);
		imagefilter($this->image, IMG_FILTER_BRIGHTNESS, 40);
		imagefilter($this->image, IMG_FILTER_CONTRAST, -10);

		return $this;
	}

	public function colorise()
	{
		$dest = imagecreatefromjpeg($this->assetDirectory . "pattern5.jpg");

		$x = imagesx($this->image);
		$y = imagesy($this->image);

		$x2 = imagesx($dest);
		$y2 = imagesy($dest);

		$thumb = imagecreatetruecolor($x, $y);
		imagecopyresampled($thumb, $dest, 0, 0, 0, 0, $x, $y, $x2, $y2);

		imagecopymerge($this->image, $thumb, 0, 0, 0, 0, $x, $y, 40);
		imagefilter($this->image, IMG_FILTER_CONTRAST, -25);
		
		return $this;
	}

	public function sepia()
	{
		imagefilter($this->image, IMG_FILTER_GRAYSCALE);
		imagefilter($this->image, IMG_FILTER_COLORIZE, 100, 50, 0);
		
		return $this;
	}

	public function sharpen()
	{
		$gaussian = array(
				array(1.0, 1.0, 1.0),
				array(1.0, -7.0, 1.0),
				array(1.0, 1.0, 1.0)
		);
		imageconvolution($this->image, $gaussian, 1, 4);
		
		return $this;
	}

	public function emboss()
	{
		$gaussian = array(
				array(-2.0, -1.0, 0.0),
				array(-1.0, 1.0, 1.0),
				array(0.0, 1.0, 2.0)
		);
		
		imageconvolution($this->image, $gaussian, 1, 5);
		
		return $this;
	}

	public function cool()
	{
		imagefilter($this->image, IMG_FILTER_MEAN_REMOVAL);
		imagefilter($this->image, IMG_FILTER_CONTRAST, -50);
		
		return $this;
	}

	public function old2()
	{
		$dest = imagecreatefromjpeg($this->assetDirectory . "pattern1.jpg");

		$x = imagesx($this->image);
		$y = imagesy($this->image);

		$x2 = imagesx($dest);
		$y2 = imagesy($dest);

		$thumb = imagecreatetruecolor($x, $y);
		imagecopyresampled($thumb, $dest, 0, 0, 0, 0, $x, $y, $x2, $y2);

		imagecopymerge($this->image, $thumb, 0, 0, 0, 0, $x, $y, 40);
		
		return $this;
	}

	public function old3()
	{
		imagefilter($this->image, IMG_FILTER_CONTRAST, -30);

		$dest = imagecreatefromjpeg($this->assetDirectory . "pattern3.jpg");

		$x = imagesx($this->image);
		$y = imagesy($this->image);

		$x2 = imagesx($dest);
		$y2 = imagesy($dest);

		$thumb = imagecreatetruecolor($x, $y);
		imagecopyresampled($thumb, $dest, 0, 0, 0, 0, $x, $y, $x2, $y2);

		imagecopymerge($this->image, $thumb, 0, 0, 0, 0, $x, $y, 50);
		
		return $this;
	}

	public function old()
	{
		$dest = imagecreatefromjpeg($this->assetDirectory . "bg1.jpg");

		$x = imagesx($this->image);
		$y = imagesy($this->image);

		$x2 = imagesx($dest);
		$y2 = imagesy($dest);

		$thumb = imagecreatetruecolor($x, $y);
		imagecopyresampled($thumb, $dest, 0, 0, 0, 0, $x, $y, $x2, $y2);

		imagecopymerge($this->image, $thumb, 0, 0, 0, 0, $x, $y, 30);
		
		return $this;
	}

	public function light()
	{
		imagefilter($this->image, IMG_FILTER_BRIGHTNESS, 10);
		imagefilter($this->image, IMG_FILTER_COLORIZE, 100, 50, 0, 10);
		
		return $this;
	}

	public function aqua()
	{
		imagefilter($this->image, IMG_FILTER_COLORIZE, 0, 70, 0, 30);
		
		return $this;
	}

	public function fuzzy()
	{
		$gaussian = array(
				array(1.0, 1.0, 1.0),
				array(1.0, 1.0, 1.0),
				array(1.0, 1.0, 1.0)
		);

		imageconvolution($this->image, $gaussian, 9, 20);
		
		return $this;
	}

	public function boost()
	{
		imagefilter($this->image, IMG_FILTER_CONTRAST, -35);
		imagefilter($this->image, IMG_FILTER_BRIGHTNESS, 10);
		
		return $this;
	}

	public function gray()
	{
		imagefilter($this->image, IMG_FILTER_CONTRAST, -60);
		imagefilter($this->image, IMG_FILTER_GRAYSCALE);
		
		return $this;
	}
}