<?php
	namespace Juju;
	class Image implements \JsonSerializable{
		private $img;
		private $actions = array();
		private $colours = array();
		protected $width;
		protected $height;
		protected $background;
		protected $type;
		public function __construct($width,$height,$background='white',$type='png'){
			$this->img = imagecreatetruecolor($width,$height);
			if(!$this->img){
				throw new Exception('Could not create image');
			}
			if(function_exists('imageantialias')){
				imageantialias($this->img,true);
			}
			$this->width = $width;
			$this->height = $height;
			$this->colour('black',0,0,0);
			$this->colour('white',255,255,255);
			$this->colour('red',255,0,0);
			$this->colour('green',0,255,0);
			$this->colour('blue',0,0,255);
			$this->background = $background;
			$this->type = $type;
		}
		public function __get($name){
			switch($name){
				case 'width':
					return $this->width;
				break;
				case 'height':
					return $this->height;
				break;
				case 'type':
					return $this->type;
				break;
				case 'background':
					return $this->background;
				break;
				case 'actions':
					return $this->actions;
				break;
			}
		}
		public function __clone(){
			$this->img = clone $this->img;
		}
		public function __destruct(){
			imagedestroy($this->img);
		}
		public function jsonSerialize(){
			return array(
				'width'=>$this->width,
				'height'=>$this->height,
				'type'=>$this->type,
				'data'=>'data:image/'.$this->type.';base64,'.base64_encode($this->toData())
			);
		}
		public function toData(){
			ob_start();
			$this();
			$data = ob_get_contents();
			ob_end_clean();
			return $data;
		}
		public function __toString(){
			return '[Image Object ('.$this->width.','.$this->height.')]';
		}
		public function __invoke(){
			$this->render();
			$args = array_merge(array($this->img),func_get_args());
			return call_user_func_array('image'.$this->type,$args);
		}
		public function render(){
			imagefill($this->img,0,0,$this->colour($this->background));
			for($k=0;$k<count($this->actions);$k++){
				$a = $this->actions[$k];
				switch($a[0]){
					case 'text':
						imagestring(
							$this->img,
							$a[5],
							$a[2],
							$a[3],
							$a[1],
							$this->color($a[4])
						);
					break;
					case 'vertical_text':
						imagestringup(
							$this->img,
							$a[5],
							$a[2],
							$a[3],
							$a[1],
							$this->color($a[4])
						);
					break;
					case 'line':
						imageline(
							$this->img,
							$a[1],$a[2],
							$a[3], $a[4],
							$this->color($a[5])
						);
					break;
					case 'rectangle':
						imagerectangle(
							$this->img,
							$a[1],$a[2],
							$a[3],$a[4],
							$this->color($a[5])
						);
					break;
					case 'filled_rectangle':
						imagefilledrectangle(
							$this->img,
							$a[1],$a[2],
							$a[3],$a[4],
							$this->color($a[5])
						);
					break;
					case 'polygon':
						imagepolygon(
							$this->img,
							$a[1],
							count($a[1])/2,
							$this->colour($a[2])
						);
					break;
					case 'filled_polygon':
						imagefilledpolygon(
							$this->img,
							$a[1],
							count($a[1])/2,
							$this->colour($a[2])
						);
					break;
					case 'arc':
						imagearc(
							$this->img,
							$a[1],$a[2],
							$a[3],$a[4],
							$a[5],$a[6],
							$this->colour($a[7])
						);
					break;
					case 'filled_arc':
						imagefilledarc(
							$this->img,
							$a[1],$a[2],
							$a[3],$a[4],
							$a[5],$a[6],
							$this->colour($a[7]),
							$a[8]
						);
					break;
					case 'ellipse':
						imageellipse(
							$this->img,
							$a[1],$a[2],
							$a[3],$a[4],
							$this->colour($a[5])
						);
					break;
					case 'filled_ellipse':
						imagefilledellipse(
							$this->img,
							$a[1],$a[2],
							$a[3],$a[4],
							$this->colour($a[5])
						);
					break;
					case 'flood_fill':
						imagefilltoborder(
							$this->img,
							$a[1],$a[2],
							$this->colour($a[3]),
							$this->colour($a[4])
						);
					break;
					case 'filter':
						$args = array_merge(array($this->img),$a[1]);
						call_user_func_array('imagefilter',$args);
					break;
				}
			}
			return $this;
		}
		public function color(){
			return call_user_func_array(array($this, 'colour'),func_get_args());
		}
		public function colour(){
			if(func_num_args() > 1){
				if(!isset($this->colours[func_get_arg(0)])){
					$this->colours[func_get_arg(0)] = imagecolorallocate($this->img,func_get_arg(1),func_get_arg(2),func_get_arg(3));
				}
			}
			return $this->colours[func_get_arg(0)];
		}
		public function text($text,$x,$y,$colour='white',$size=1){
			array_push($this->actions,array(
				'text',
				$text,
				$x,$y,
				$colour,
				$size
			));
			return $this;
		}
		public function vertical_text($text,$x,$y,$colour='white',$size=1){
			array_push($this->actions,array(
				'vertical_text',
				$text,
				$x,$y,
				$colour,
				$size
			));
			return $this;
		}
		public function line($x1,$y1,$x2,$y2,$colour){
			array_push($this->actions,array(
				'line',
				$x1,$y1,
				$x2,$y2,
				$colour
			));
			return $this;
		}
		public function polygon($points,$colour){
			array_push($this->actions,array(
				'polygon',
				$points,
				$colour
			));
			return $this;
		}
		public function filled_polygon($points,$colour){
			array_push($this->actions,array(
				'filled_polygon',
				$points,
				$colour
			));
			return $this;
		}
		public function rectangle($x1,$y1,$x2,$y2,$colour){
			array_push($this->actions,array(
				'rectangle',
				$x1,$y1,
				$x2,$y2,
				$colour
			));
			return $this;
		}
		public function filled_rectangle($x1,$y1,$x2,$y2,$colour){
			array_push($this->actions,array(
				'filled_rectangle',
				$x1,$y1,
				$x2,$y2,
				$colour
			));
			return $this;
		}
		public function arc($cx,$cy,$w,$h,$sa,$ea,$colour){
			array_push($this->actions,array(
				'arc',
				$cx,$cy,
				$w,$h,
				$sa,$ea,
				$colour
			));
			return $this;
		}
		public function filled_arc($cx,$cy,$w,$h,$sa,$ea,$colour,$style=IMG_ARC_PIE){
			array_push($this->actions,array(
				'filled_arc',
				$cx,$cy,
				$w,$h,
				$sa,$ea,
				$colour,
				$style
			));
			return $this;
		}
		public function ellipse($cx,$cy,$w,$h,$colour){
			array_push($this->actions,array(
				'ellipse',
				$cx,$cy,
				$w,$h,
				$colour
			));
			return $this;
		}
		public function circle($cx,$cy,$w,$colour){
			return $this->ellipse($cx,$cy,$w,$w,$colour);
		}
		public function filled_ellipse($cx,$cy,$w,$h,$colour){
			array_push($this->actions,array(
				'filled_ellipse',
				$cx,$cy,
				$w,$h,
				$colour
			));
			return $this;
		}
		public function filled_circle($cx,$cy,$w,$colour){
			return $this->filled_ellipse($cx,$cy,$w,$w,$colour);
		}
		public function flood_fill($x,$y,$border_colour,$colour){
			array_push($this->actions,array(
				'flood_fill',
				$x,$y,
				$border_colour,
				$colour
			));
			return $this;
		}
		public function filter(){
			array_push($this->actions,array(
				'filter',
				func_get_args()
			));
			return $this;
		}
		public function copy($dest){
			$this->render();
			imagepalettecopy($dest,$this->img);
			return $this;
		}
	}
?>