<?php

class Url {
	
	static private $properties = array(
		'scheme' => '',
		'host' => '',
		'port' => '',
		'path' => '',
		'dirname' => '',
		'basename' => '',
		'filename' => '',
		'extension' => '',
		'fragment' => '',
		'query' => '',
	);
	
	static public function get ( $url = '' ) {
		
		return new self($url);
		
	}
	
	static public function parse ( $url ) {
		
		$urlData = parse_url($url);
		$urlData = array_merge(self::$properties, $urlData, pathinfo($urlData['path']));
		
		if ( isset($urlData['query']) )
			parse_str($urlData['query'], $urlData['query']);
		
		return $urlData;
		
	}
	
	static public function build ( $urlData ) {
		
		if ( isset($urlData['query']) )
			$urlData['query'] = http_build_str($urlData['query']);
		
		return http_build_url($urlData);
		
	}
	
	static public function override ( $urlData, $part, $value ) {
		
		$urlData[$part] = $value;
		$update = 0;
		
		switch ( $part ) {
			
			case 'path':
				$update = 1;
			break;
			
			case 'dirname':
				$urlData['path'] = preg_replace('!//++!', '/', $urlData['dirname'] . '/' . $urlData['basename']);
			break;
			
			case 'basename':
				$urlData['path'] = preg_replace('!//++!', '/', $urlData['dirname'] . '/' . $urlData['basename']);
				$update = 1;
			break;
			
			case 'filename':
				$urlData['path'] = preg_replace('!//++!', '/', $urlData['dirname'] . '/' . $urlData['filename'] . '.' . $urlData['extension']);
				$urlData['basename'] = $urlData['filename'] . ( $urlData['extension'] ? '.' . $urlData['extension'] : '' );
			break;
			
			case 'extension':
				$urlData['path'] = preg_replace('!//++!', '/', $urlData['dirname'] . '/' . $urlData['filename'] . '.' . $urlData['extension']);
				$urlData['basename'] = $urlData['filename'] . ( $urlData['extension'] ? '.' . $urlData['extension'] : '' );
			break;
			
		}
		
		if ( $update ) {
			
			$urlData['dirname'] = '';
			$urlData['basename'] = '';
			$urlData['filename'] = '';
			$urlData['extension'] = '';
			
			$urlData = array_merge($urlData, pathinfo($urlData['path']));
			
		}
		
		return $urlData;
		
	}
	
	private $data = array();
	
	public function __construct ( $urlData = array() ) {
		
		if ( $urlData instanceof self )
			$urlData = $urlData->data;
		
		elseif ( is_string($urlData) )
			$urlData = self::parse($urlData);
		
		elseif ( is_array($urlData) ) foreach ( $urlData as $p => $v )
			$urlData = self::override($urlData, $p, $v);
		
		else throw SenseException::sprintf(
			'Argument of type "%1$s" is invalid ! Type "string","array" or "Url" expected !',
			gettype($urlData)
		);
		
		$this->data = $urlData;
		
	}
	
	public function __invoke ( $parts ) {
		
		$urlData = $this->data;
		
		foreach ( $parts as $part => $value ) {
			
			if ( !array_key_exists($part, self::$properties) )
				throw new SenseException(sprintf(
					'Property "%1$s" does not exist in Url instance !', 
					$part
				));
			
			$urlData = self::override($urlData, $part, $value);
			
		}
		
		return new self($urlData);
		
	}
	
	public function __call ( $name, $args ) {
		
		if ( !array_key_exists($name, self::$properties) )
			throw new SenseException(sprintf(
				'Property "%1$s" does not exist in Url instance !', 
				$name
			));
		
		return new self(self::override($this->data, $name, $args[0]));
		
	}
	
	public function &__get ( $offset ) {
		
		if ( !array_key_exists($offset, self::$properties) )
			throw new SenseException(sprintf(
				'Property "%1$s" does not exist in Url instance !', 
				$offset
			));
		
		return $this->data[$offset];
		
	}
	
	public function __set ( $offset, $value ) {
		
		if ( !array_key_exists($offset, self::$properties) )
			throw new SenseException(sprintf(
				'Property "%1$s" does not exist in Url instance !', 
				$offset
			));
		
		$this->data = self::override($this->data, $offset, $value);
		
		return $value;
		
	}
	
	public function __unset ( $offset ) {
		
		if ( !array_key_exists($offset, self::$properties) )
			throw new SenseException(sprintf(
				'Property "%1$s" does not exist in Url instance !', 
				$offset
			));
		
		$this->$offset = '';
		
	}
	
	public function __toString ( ) {
		
		return self::build($this->data);
		
	}
	
}

?>