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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 - Code39
 *       Generate Code39 Barcodes
 *
 *
 * @license     http://opensource.org/licenses/mit-license.php The MIT License
 * @link        https://github.com/samt/barcode
 */
class Code39 extends BarcodeBase
{
    /*
     * Binary map
     * @var array binMap
     */
    private static $binMap = array(
        ' ' => '011000100',
        '$' => '010101000',
        '%' => '000101010',
        '*' => '010010100', // Start/stop marker
        '+' => '010001010',
        '|' => '010000101',
        '.' => '110000100',
        '/' => '010100010',
        '-' => '010000101',
        '0' => '000110100',
        '1' => '100100001',
        '2' => '001100001',
        '3' => '101100000',
        '4' => '000110001',
        '5' => '100110000',
        '6' => '001110000',
        '7' => '000100101',
        '8' => '100100100',
        '9' => '001100100',
        'A' => '100001001',
        'B' => '001001001',
        'C' => '101001000',
        'D' => '000011001',
        'E' => '100011000',
        'F' => '001011000',
        'G' => '000001101',
        'H' => '100001100',
        'I' => '001001100',
        'J' => '000011100',
        'K' => '100000011',
        'L' => '001000011',
        'M' => '101000010',
        'N' => '000010011',
        'O' => '100010010',
        'P' => '001010010',
        'Q' => '000000111',
        'R' => '100000110',
        'S' => '001000110',
        'T' => '000010110',
        'U' => '110000001',
        'V' => '011000001',
        'W' => '111000000',
        'X' => '010010001',
        'Y' => '110010000',
        'Z' => '011010000',
    );

    /*
     * const bar proportions
     */
    const NARROW_BAR    = 20;
    const WIDE_BAR      = 55;
    const QUIET_BAR     = 35;

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

    /*
     * Get a binary map value
     */
    private function getMap($char)
    {
        return self::$binMap[$char] ?: self::$this->binMap[' '];
    }

    /*
     * Draw the image
     *
     * Based on the implentation PHP Barcode Image Generator v1.0 
     * by Charles J. Scheffold - [email protected]
     * It was released into the Public Domain by its creator.
     *
     * @return void
     */
    public function draw()
    {
        // I know, lots of junk.
        $data = '*' . strtoupper(ltrim(rtrim(trim($this->data), '*'), '*')) . '*';
    
        //                Length of data  X   [ 6 narrow bars       +     3 wide bars      + A single Quiet stop ] - a single quiet stop
        $pxPerChar = (strlen($data) * ((6 * self::NARROW_BAR) + (3 * self::WIDE_BAR) + self::QUIET_BAR)) - self::QUIET_BAR;
        $widthQuotient = $this->x / $pxPerChar;
        
        // Lengths per type
        $narrowBar  = (int) (self::NARROW_BAR * $widthQuotient);
        $wideBar    = (int) (self::WIDE_BAR * $widthQuotient);
        $quietBar   = (int) (self::QUIET_BAR * $widthQuotient);

        $imageWidth = (strlen($data) * ((6 * $narrowBar) + (3 * $wideBar) + $quietBar)) - $quietBar;

        // Do we have degenerate rectangles?
        if ($narrowBar < 1 || $wideBar < 1 || $quietBar < 1 || $narrowBar == $quietBar || $narrowBar == $wideBar || $wideBar == $quietBar)
        {
            throw new \OverflowException("You need to specify a bigger width to properly display this barcode");
        }

        $currentBarX = (int)(($this->x - $imageWidth) / 2);
        $charAry = str_split($data);

        $this->img = @imagecreate($this->x, $this->y);

        if (!$this->img)
        {
            throw new \RuntimeException("Code39: Image failed to initialize");
        }
        
        // Grab our colors
        $white = imagecolorallocate($this->img, 255, 255, 255);
        $black = imagecolorallocate($this->img, 0, 0, 0);
        $color = $black;

        foreach($charAry as $_k => $char)
        {
            $code = str_split($this->getMap($char));
            $color = $black; 

            foreach($code as $k => $bit)
            {
                // Narrow bar
                if ($bit == '0')
                {
                    imagefilledrectangle($this->img, $currentBarX, 0, ($currentBarX + $narrowBar), ($this->y - 1), $color);
                    $currentBarX += $narrowBar;
                }
                // Wide Bar
                elseif($bit == '1')
                {
                    imagefilledrectangle($this->img, $currentBarX, 0, ($currentBarX + $wideBar), ($this->y - 1), $color);
                    $currentBarX += $wideBar;
                }

                $color = ($color == $black) ? $white : $black;
            }

            // Skip the spacer on the last run 
            if ($_k == (sizeof($charAry) - 1))
            {
                break;
            }

            // Draw spacer
            imagefilledrectangle($this->img, $currentBarX, 0, ($currentBarX + $quietBar), ($this->y - 1), $white);
            $currentBarX += $quietBar;
        }
    }
}
?>