<?php
/**
 * file_uploader.class.php
 * Created by Komma Mediadesign.
 * Author: mike
 * Date: 4/16/13
 */

class File_Uploader
{
    /*
     * File to upload
     */
	private $_file;

    /*
     * Target where we will upload the file
     */
	private $_uploadTarget;

    /*
     * Extensions that we are allowed to upload.
     * Default set to jpg, jpeg, gif and png.
     */
    private $_allowedExt = array('jpg','jpeg','gif','png');

    /*
     * Maximum size of a file that we upload.
     * Default set to 10mb.
     */
    private $_maxSize= 10000000;

    /*
     * Errors that occur during upload.
     */
	private $_errors = array();
		
	public function __construct($file)
	{
		$this->_file = $file;
		$this->_uploadTarget = DOCUMENT_UPLOADS_ROOT;
	}
	
	
	/*
	
		GET / SET
		
	*/


    /*
     * Set
     */
    public function set($prop,$val)
    {
        if( ! empty($prop))
        {
            $this->{$prop} = $val;
        }
    }

    /*
     * Set
     */
    public function get($prop)
    {
        if( ! empty($prop))
        {
            return $this->{$prop};
        }
        return false;
    }

	/**
	* Returns the extension of a given fileString
	*
	* @param string
	* @return string
	*/
	public function getExt($input)
	{
		$temp = explode('.', $input); 
		$fileExt = strtolower($temp[count($temp) - 1]);
		return $fileExt;
	}

    /*
     * Convert bytes to megabytes
     */
    private function mb($input)
    {
        return ceil($input / 1000000) . 'mb';
    }

	
	/*
	
		IMAGE HANDLING
		
	*/	

	
	/**
	* Uploads the image
	*
	* @return boolean
	*/
	public function upload()
	{
		$path =  $this->_uploadTarget.urlencode($this->_file['name']);
		if(copy($this->_file['tmp_name'],$path))
		{
			return urlencode($this->_file['name']);
		}
		return FALSE;
	}


	/*
	
		VALIDATION
		
	*/	
	
	
	/**
	* Validates the image 
	*
	* @access public
	* @return boolean
	*/
	public function validate()
	{
		if($this->checkSize() && $this->checkExt())
		{
			return TRUE;
		}
        return FALSE;
    }
	
	/**
	* Checks if the file size is valid
	*
	* @return boolean
	*/
	private function checkSize()
	{
		if($this->_file['size'] < $this->_maxSize)
		{
			return TRUE;
		}

        // Set error message
        $this->_errors[] = 'File size too big, this is ' . $this->mb($this->_file['size']) . ' and max is ' . $this->mb($this->_maxSize);
        return FALSE;
	}
	
	/**
	* Returns a string containing the extension of the file
	*
	* @return boolean
	*/
	private function checkExt() 
	{ 
    	$fileExt = $this->getExt($this->_file['name']);
       	if(in_array($fileExt, $this->_allowedExt))
       	{
       		return TRUE;
       	}

        // Set error message
        $msg = 'Invalid extension, '.$this->_file['name'].' has "'.$fileExt.'". Allowed are ';
        foreach($this->_allowedExt as $ext)
        {
            $msg .= $ext.', ';
        }
        $msg = substr($msg,0,-2);

        $this->_errors[] = $msg;
        return FALSE;
    }
    
    /**
    * Checks whether the upload directory is writable
    *
    * @access private
    * @param
    * @return boolean
    */
    private function isWritable() 
    { 
    	if(is_writable( $this->_uploadTarget ) )
    	{
    		return TRUE;
    	}
    	else 
    	{
    		$this->_errors[] = 'Upload target "'.$this->_uploadTarget.'" is not writable';
    		return FALSE;
    	}
    } 
}