<?php
$imageKeys = array();
function registerImageKey($key, $value) {
    global $imageKeys;
    $imageKeys[$key] = $value;
}

function getImageKeys() {
    global $imageKeys;
    return $imageKeys;
}

function getElementHtml($tag, $attributes, $content = false) {
    $code = '<' . $tag;
    foreach ($attributes as $attribute => $value) {
        $code .= ' ' . $attribute . '="' . htmlentities(stripslashes($value), ENT_COMPAT) . '"';
    }

    if ($content === false || $content === null) {
        $code .= ' />';
    } else {
        $code .= '>' . $content . '</' . $tag . '>';
    }

    return $code;
}

function getInputTextHtml($name, $currentValue, $attributes = array()) {
    $defaultAttributes = array(
        'id' => $name,
        'name' => $name
    );

    $finalAttributes = array_merge($defaultAttributes, $attributes);
    if ($currentValue !== null) {
        $finalAttributes['value'] = $currentValue;
    }

    return getElementHtml('input', $finalAttributes, false);
}

function getOptionGroup($options, $currentValue) {
    $content = '';
    foreach ($options as $optionKey => $optionValue) {
        if (is_array($optionValue)) {
            $content .= '<optgroup label="' . $optionKey . '">' . getOptionGroup($optionValue, $currentValue) . '</optgroup>';
        } else {
            $optionAttributes = array();
            if ($currentValue == $optionKey) {
                $optionAttributes['selected'] = 'selected';
            }
            $content .= getOptionHtml($optionKey, $optionValue, $optionAttributes);
        }
    }

    return $content;
}

function getOptionHtml($value, $content, $attributes = array()) {
    $defaultAttributes = array(
        'value' => $value
    );

    $finalAttributes = array_merge($defaultAttributes, $attributes);

    return getElementHtml('option', $finalAttributes, $content);
}

function getSelectHtml($name, $currentValue, $options, $attributes = array()) {
    $defaultAttributes = array(
        'size' => 1,
        'id' => $name,
        'name' => $name
    );

    $finalAttributes = array_merge($defaultAttributes, $attributes);
    $content = getOptionGroup($options, $currentValue);

    return getElementHtml('select', $finalAttributes, $content);
}

function getCheckboxHtml($name, $currentValue, $attributes = array()) {
    $defaultAttributes = array(
        'type' => 'checkbox',
        'id' => $name,
        'name' => $name,
        'value' => isset($attributes['value']) ? $attributes['value'] : 'On'
    );

    $finalAttributes = array_merge($defaultAttributes, $attributes);
    if ($currentValue == $finalAttributes['value']) {
        $finalAttributes['checked'] = 'checked';
    }

    return getElementHtml('input', $finalAttributes, false);
}

function getButton($value, $output = null) {
    $escaped = false;
    $finalValue = $value[0] === '&' ? $value : htmlentities($value);
    if ($output === null) {
        $output = $value;
    } else {
        $escaped = true;
    }

    $code = '<input type="button" value="' . $finalValue . '" data-output="' . $output . '"' . ($escaped ? ' data-escaped="true"' : '') . ' />';
    return $code;
}

/**
 * Returns the fonts available for drawing.
 *
 * @return string[]
 */
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, 'No Label');

    return $array;
}

function findValueFromKey($haystack, $needle) {
    foreach ($haystack as $key => $value) {
        if (strcasecmp($key, $needle) === 0) {
            return $value;
        }
    }

    return null;
}

function convertText($text) {
    $text = stripslashes($text);
    if (function_exists('mb_convert_encoding')) {
        $text = mb_convert_encoding($text, 'ISO-8859-1', 'UTF-8');
    }

    return $text;
}

function showError() {
    header('Content-Type: image/png');
    readfile('error.png');
    exit;
}

$requiredKeys = array('code', 'filetype', 'dpi', 'scale', 'rotation', 'font_family', 'font_size', 'text');

// Check if everything is present in the request
foreach ($requiredKeys as $key) {
    if (!isset($_GET[$key])) {
        showError();
    }
}

if (!preg_match('/^[A-Za-z0-9]+$/', $_GET['code'])) {
    showError();
}

$code = $_GET['code'];

// Check if the code is valid
if (!file_exists('config' . DIRECTORY_SEPARATOR . $code . '.php')) {
    showError();
}

include_once('config' . DIRECTORY_SEPARATOR . $code . '.php');

$class_dir = '.' . DIRECTORY_SEPARATOR . 'class';
require_once($class_dir . DIRECTORY_SEPARATOR . 'BCGColor.php');
require_once($class_dir . DIRECTORY_SEPARATOR . 'BCGBarcode.php');
require_once($class_dir . DIRECTORY_SEPARATOR . 'BCGDrawing.php');
require_once($class_dir . DIRECTORY_SEPARATOR . 'BCGFontFile.php');

if (!include_once($class_dir . DIRECTORY_SEPARATOR . $classFile)) {
    showError();
}

include_once('config' . DIRECTORY_SEPARATOR . $baseClassFile);

$filetypes = array('PNG' => BCGDrawing::IMG_FORMAT_PNG, 'JPEG' => BCGDrawing::IMG_FORMAT_JPEG, 'GIF' => BCGDrawing::IMG_FORMAT_GIF);

$drawException = null;
try {
    $color_black = new BCGColor(0, 0, 0);
    $color_white = new BCGColor(255, 255, 255);

    $code_generated = new $className();

    if (function_exists('baseCustomSetup')) {
        baseCustomSetup($code_generated, $_GET);
    }

    if (function_exists('customSetup')) {
        customSetup($code_generated, $_GET);
    }

    $code_generated->setScale(max(1, min(4, $_GET['scale'])));
    $code_generated->setBackgroundColor($color_white);
    $code_generated->setForegroundColor($color_black);

    if ($_GET['text'] !== '') {
        $text = convertText($_GET['text']);
        $code_generated->parse($text);
    }
} catch(Exception $exception) {
    $drawException = $exception;
}

$drawing = new BCGDrawing('', $color_white);
if($drawException) {
    $drawing->drawException($drawException);
} else {
    $drawing->setBarcode($code_generated);
    $drawing->setRotationAngle($_GET['rotation']);
    $drawing->setDPI($_GET['dpi'] === 'NULL' ? null : max(72, min(300, intval($_GET['dpi']))));
    $drawing->draw();
}

switch ($_GET['filetype']) {
    case 'PNG':
        header('Content-Type: image/png');
        break;
    case 'JPEG':
        header('Content-Type: image/jpeg');
        break;
    case 'GIF':
        header('Content-Type: image/gif');
        break;
}

$drawing->finish($filetypes[$_GET['filetype']]);
?>