<?php

class Verk_Image {
	
	
	/* Image types constants
	*/
	const IMAGETYPE_GIF		= 1;
	const IMAGETYPE_JPG		= 2;
	const IMAGETYPE_JPEG	= 2;
	const IMAGETYPE_PNG		= 3;
	
	
	/* Avalible extensions
	*/
	const EXT_NONE			= -1;
	const EXT_GD			= 1;
	const EXT_IM			= 2;
	
	
	/* Holds the image type
	*/
	protected $_type;
	
	
	/* Holds the extensions avalible
	*/
	protected $_extensions;
	
	
	/* Holds additional options
	*/
	protected $_options;
	
	
	/* Holds the adapter
	*/
	protected $_adapter;
	
	
	/* Lets setup a new image
	 * 
	 * If no image is passed to the constructor, create a new blank image and return an adapter.
	 * If no adapter is passed, try to guess what to use.
	 * If an image is passed, create a new image by the type of the image.
	*/
	public function __construct($options) {
		
		// First lets check if we have an extension
		$this->_extensions = $this->_setAvalibleExtensions();
		if(in_array(self::EXT_NONE, $this->getAvalibleExtensions())) {
			throw new Verk_Image_Exception('No available extensions.');
		}
		
		// lets check if adapter is set. If not we'll get one later
		if(isset($options['adapter'])) {
			$this->setDefaultAdapter('Verk_Image_Adapter_' . $options['adapter']);
		}
		
		// get the adapter. If no adapter set we'll get the default one for the extension
		$adapter = $this->getDefaultAdapter();
		
	}
	
	
	public function setDefaultAdapter($adapter) {
		if(is_string($adapter)) {
			$this->_adapter = new $adapter;
		}
		return $this;
	}
	
	public function getDefaultAdapter() {
		if(null === $this->_adapter) {
			$adapter = $this->getAdapterName($this->_extensions[0]);
			$this->setDefaultAdapter('Verk_Image_Adapter_' . $adapter);
		}
		return $this;
	}
	
	
	/* get adapter based on int
	*/
	public function getAdapterName($int) {
		switch ($int) {
			case self::EXT_GD:
				return 'Gd';
			break;
			case self::EXT_IM:
				return 'Imagick';
			break;
		}
	}
	
	
	/* Checks what extensions is loaded and sets them
	*/
	protected function _setAvalibleExtensions() {
		$extensions = array();
		if(extension_loaded('gd')) {
			$extensions[] = self::EXT_GD;
		}
		if(extension_loaded('imagick')) {
			$extensions[] = self::EXT_IM;
		}
		
		// check if an extension is found. If not add EXT_NONE
		if(count($extensions) < 1) {
			$extensions[] = self::EXT_NONE;
		}
		return $extensions;
	}
	
	
	/* Returns the avalible extensions
	*/
	public function getAvalibleExtensions() {
		return $this->_extensions;
	}
	
	
	/* Sets the options to a protected variable
	*/
	protected function _setOptions($options = array()) {}
	
	
	/* Returns an array with the options for verk_image
	*/
	public function getOptions() {
		return $this->_options;
	}
	
}