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<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

use emberlabs\Barcode\BarcodeBase;
require APPPATH.'/views/barcodes/BarcodeBase.php';
require APPPATH.'/views/barcodes/Code39.php';
require APPPATH.'/views/barcodes/Code128.php';
require APPPATH.'/views/barcodes/Ean13.php';
require APPPATH.'/views/barcodes/Ean8.php';

class Barcode_lib
{
    private $CI;
    private $supported_barcodes = array('Code39' => 'Code 39', 'Code128' => 'Code 128', 'Ean8' => 'EAN 8', 'Ean13' => 'EAN 13');
    
    public function __construct()
    {
        $this->CI =& get_instance();
    }
    
    public function get_list_barcodes()
    {
        return $this->supported_barcodes;
    }
    
    public function get_barcode_config()
    {
        $data['company'] = $this->CI->config->item('company');
        $data['barcode_content'] = $this->CI->config->item('barcode_content');
        $data['barcode_type'] = $this->CI->config->item('barcode_type');
        $data['barcode_font'] = $this->CI->config->item('barcode_font');
        $data['barcode_font_size'] = $this->CI->config->item('barcode_font_size');
        $data['barcode_height'] = $this->CI->config->item('barcode_height');
        $data['barcode_width'] = $this->CI->config->item('barcode_width');
        $data['barcode_quality'] = $this->CI->config->item('barcode_quality');
        $data['barcode_first_row'] = $this->CI->config->item('barcode_first_row');
        $data['barcode_second_row'] = $this->CI->config->item('barcode_second_row');
        $data['barcode_third_row'] = $this->CI->config->item('barcode_third_row');
        $data['barcode_num_in_row'] = $this->CI->config->item('barcode_num_in_row');
        $data['barcode_page_width'] = $this->CI->config->item('barcode_page_width');      
        $data['barcode_page_cellspacing'] = $this->CI->config->item('barcode_page_cellspacing');
        $data['barcode_generate_if_empty'] = $this->CI->config->item('barcode_generate_if_empty');
        
        return $data;
    }

    public function validate_barcode($barcode)
    {
        $barcode_type = $this->CI->config->item('barcode_type');
        $barcode_instance = $this->get_barcode_instance($barcode_type);
        return $barcode_instance->validate($barcode);
    }

    public static function barcode_instance($item, $barcode_config)
    {
        $barcode_instance = Barcode_lib::get_barcode_instance($barcode_config['barcode_type']);
        $is_valid = empty($item['item_number']) && $barcode_config['barcode_generate_if_empty'] || $barcode_instance->validate($item['item_number']);

        // if barcode validation does not succeed,
        if (!$is_valid)
        {
            $barcode_instance = Barcode_lib::get_barcode_instance();
        }
        $seed = Barcode_lib::barcode_seed($item, $barcode_instance, $barcode_config);
        $barcode_instance->setData($seed);

        return $barcode_instance;
    }

    private static function get_barcode_instance($barcode_type='Code128')
    {
        switch($barcode_type)
        {
            case 'Code39':
                return new emberlabs\Barcode\Code39();
                break;
                
            case 'Code128':
            default:
                return new emberlabs\Barcode\Code128();
                break;
                
            case 'Ean8':
                return new emberlabs\Barcode\Ean8();
                break;
                
            case 'Ean13':
                return new emberlabs\Barcode\Ean13();
                break;
        }
    }

    private static function barcode_seed($item, $barcode_instance, $barcode_config)
    {
        $seed = $barcode_config['barcode_content'] !== "id" && !empty($item['item_number']) ? $item['item_number'] : $item['item_id'];

        if( $barcode_config['barcode_content'] !== "id" && !empty($item['item_number']))
        {
            $seed = $item['item_number'];
        }
        else
        {
            if ($barcode_config['barcode_generate_if_empty'])
            {
                // generate barcode with the correct instance
                $seed = $barcode_instance->generate($seed);
            }
            else
            {
                $seed = $item['item_id'];
            }
        }
        return $seed;
    }

    private function generate_barcode($item, $barcode_config)
    {
        try
        {
            $barcode_instance = Barcode_lib::barcode_instance($item, $barcode_config);
            $barcode_instance->setQuality($barcode_config['barcode_quality']);
            $barcode_instance->setDimensions($barcode_config['barcode_width'], $barcode_config['barcode_height']);

            $barcode_instance->draw();
            
            return $barcode_instance->base64();
        } 
        catch(Exception $e)
        {
            echo 'Caught exception: ', $e->getMessage(), "\n";      
        }
    }

    public function generate_receipt_barcode($barcode_content)
    {
        try
        {
            // Code128 is the default and used in this case for the receipts
            $barcode = $this->get_barcode_instance();

            // set the receipt number to generate the barcode for
            $barcode->setData($barcode_content);
            
            // image quality 100
            $barcode->setQuality(100);
            
            // width: 200, height: 30
            $barcode->setDimensions(200, 30);

            // draw the image
            $barcode->draw();
            
            return $barcode->base64();
        } 
        catch(Exception $e)
        {
            echo 'Caught exception: ', $e->getMessage(), "\n";      
        }
    }
    
    public function display_barcode($item, $barcode_config)
    {
        $display_table = "<table>";
        $display_table .= "<tr><td align='center'>" . $this->manage_display_layout($barcode_config['barcode_first_row'], $item, $barcode_config) . "</td></tr>";
        $barcode = $this->generate_barcode($item, $barcode_config);
        $display_table .= "<tr><td align='center'><img src='data:image/png;base64,$barcode' /></td></tr>";
        $display_table .= "<tr><td align='center'>" . $this->manage_display_layout($barcode_config['barcode_second_row'], $item, $barcode_config) . "</td></tr>";
        $display_table .= "<tr><td align='center'>" . $this->manage_display_layout($barcode_config['barcode_third_row'], $item, $barcode_config) . "</td></tr>";
        $display_table .= "</table>";
        
        return $display_table;
    }
    
    private function manage_display_layout($layout_type, $item, $barcode_config)
    {
        $result = '';
        
        if($layout_type == 'name')
        {
            $result = $this->CI->lang->line('items_name') . " " . $item['name'];
        }
        elseif($layout_type == 'category' && isset($item['category']))
        {
            $result = $this->CI->lang->line('items_category') . " " . $item['category'];
        }
        elseif($layout_type == 'cost_price' && isset($item['cost_price']))
        {
            $result = $this->CI->lang->line('items_cost_price') . " " . to_currency($item['cost_price']);
        }
        elseif($layout_type == 'unit_price' && isset($item['unit_price']))
        {
            $result = $this->CI->lang->line('items_unit_price') . " " . to_currency($item['unit_price']);
        }
        elseif($layout_type == 'company_name')
        {
            $result = $barcode_config['company'];
        }
        elseif($layout_type == 'item_code')
        {
            $result = $barcode_config['barcode_content'] !== "id" && isset($item['item_number']) ? $item['item_number'] : $item['item_id'];
        }

        return character_limiter($result, 40);
    }
    
    public function listfonts($folder) 
    {
        $array = array();

        if (($handle = opendir($folder)) !== FALSE)
        {
            while (($file = readdir($handle)) !== FALSE)
            {
                if(substr($file, -4, 4) === '.ttf')
                {
                    $array[$file] = $file;
                }
            }
        }

        closedir($handle);

        array_unshift($array, $this->CI->lang->line('config_none'));

        return $array;
    }

    public function get_font_name($font_file_name)
    {
        return substr($font_file_name, 0, -4);
    }
}

?>