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<?php
/**
 *
 * @package     Barcode Creator
 * @copyright   (c) 2011 emberlabs.org
 * @license     http://opensource.org/licenses/mit-license.php The MIT License
 * @link        https://github.com/samt/barcode
 *
 * Minimum Requirement: PHP 5.3.0
 */

namespace emberlabs\Barcode;

/**
 * emberlabs Barcode Creator - Barcode Base
 *       Abstract Base
 *
 *
 * @license     http://opensource.org/licenses/mit-license.php The MIT License
 * @link        https://github.com/samt/barcode
 */
abstract class BarcodeBase
{
    /*
     * GD Resource
     * @var resource
     */
    protected $img = null;

    /*
     * @var data - to be set
     */
    protected $data = '';
    
    /*
     * @var int x (width)
     */
    protected $x = 0;

    /*
     * @var int y (height)
     */
    protected $y = 0;

    /*
     * Print Human Text?
     * @var bool
     */
    protected $humanText = true;

    /*
     * Quality
     * @var int
     */
    protected $jpgQuality = 85;

    /*
     * (Abstract) Set the data
     *
     * @param mixed data - (int or string) Data to be encoded
     * @return instance of \emberlabs\Barcode\BarcodeInterface
     * @return throws \OverflowException
     */
    abstract public function setData($data);

    /*
     * Get the data
     *
     * @param mixed data - (int or string) Data to be encoded
     * @return instance of \emberlabs\Barcode\BarcodeInterface
     * @return throws \OverflowException
     */
    public function getData()
    {
        return $this->data;
    }

    /**
     * Validate the given barcode.
     * @param $barcode The barcode to validate
     * @return bool true if it complies with the barcode formatting
     */
    public function validate($barcode)
    {
        return TRUE;
    }

    /**
     * Generate a barcode for this implementation using the given seed.
     * Default implementation returns just the seed
     * @param $number The seed to generate a barcode for
     * @return mixed The generated barcode
     */
    public function generate($number)
    {
        return $number;
    }

    /*
     * (Abstract) Draw the image
     *
     * @return void
     */
    abstract public function draw();

    /*
     * Set the Dimensions
     *
     * @param int x
     * @param int y
     * @return instance of \emberlabs\Barcode\BarcodeBase
     */
    public function setDimensions($x, $y)
    {
        $this->x = (int) $x;
        $this->y = (int) $y;

        return $this;
    }

    /*
     * Set Quality
     * @param int q - jpeg quality 
     * @return instance of \emberlabs\Barcode\BarcodeBase
     */
    public function setQuality($q)
    {
        $this->jpgQuality = (int) $q;

        return $this;
    }

    /*
     * Display human readable text below the code
     * @param boolean enable - Enable the human readable text
     * @return instance of \emberlabs\Barcode\BarcodeBase
     */
    public function enableHumanText($enable = true)
    {
        $this->humanText = (boolean) $enable;

        return $this;
    }

    /*
     * Output Image to the buffer
     *
     * @return void
     */
    public function output($type = 'png')
    {
        switch($type)
        {
            case 'jpg':
            case 'jpeg':
                imagejpeg($this->img, null, $this->jpgQuality);
            break;

            case 'gif':
                imagegif($this->img);
            break;

            case 'png':
            default:
                imagepng($this->img);
            break;
        }
    }

    /*
     * Save Image
     *
     * @param string filename - File to write to (needs to have .png, .gif, or 
     *  .jpg extension)
     * @return void
     * @throws \RuntimeException - If the file could not be written or some 
     *  other I/O error. 
     */
    public function save($filename)
    {
        $type = strtolower(substr(strrchr($filename, '.'), 1));

        switch($type)
        {
            case 'jpg':
            case 'jpeg':
                imagejpeg($this->img, $filename, $this->jpgQuality);
            break;

            case 'gif':
                imagegif($this->img, $filename);
            break;

            case 'png':
                imagepng($this->img, $filename);
            break;

            default:
                throw new \RuntimeException("Could not determine file type.");
            break;
        }
    }

    /*
     * Base64 Encoded 
     * For ouput in-page
     * @return void
     */
    public function base64()
    {
        ob_start();
        $this->output();

        return base64_encode(ob_get_clean());
    }
}
?>