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<?php
// Check system requirements for OG image generation
header('Content-Type: application/json');

$requirements = [];

// Check PHP version
$requirements['php_version'] = PHP_VERSION;

// Check if GD library is available
$requirements['gd_available'] = extension_loaded('gd');

// Check GD info
$requirements['gd_info'] = false;
if ($requirements['gd_available']) {
    $gd_info = gd_info();
    $requirements['gd_info'] = !empty($gd_info);
    $requirements['gd_details'] = $gd_info;
}

// Test if we can actually create images
$requirements['can_create_images'] = false;
if ($requirements['gd_available']) {
    try {
        $test_image = imagecreatetruecolor(100, 100);
        if ($test_image) {
            $requirements['can_create_images'] = true;
            imagedestroy($test_image);
        }
    } catch (Exception $e) {
        $requirements['image_error'] = $e->getMessage();
    }
}

// Check file writing permissions
$requirements['can_write_files'] = is_writable(__DIR__);

// Check PHP configuration
$requirements['memory_limit'] = ini_get('memory_limit');
$requirements['max_execution_time'] = ini_get('max_execution_time');
$requirements['upload_max_filesize'] = ini_get('upload_max_filesize');
$requirements['post_max_size'] = ini_get('post_max_size');

// Check for recent errors
$requirements['recent_errors'] = [];
$error_log = ini_get('error_log');
if ($error_log && file_exists($error_log)) {
    $log_content = file_get_contents($error_log);
    if ($log_content) {
        $lines = array_slice(explode("\n", $log_content), -10); // Last 10 lines
        foreach ($lines as $line) {
            if (strpos($line, 'error') !== false || strpos($line, 'Error') !== false) {
                $requirements['recent_errors'][] = trim($line);
            }
        }
    }
}

// Check specific GD functions
$requirements['gd_functions'] = [];
if ($requirements['gd_available']) {
    $gd_functions = [
        'imagecreatetruecolor',
        'imagecolorallocate',
        'imagefilledellipse',
        'imagefilledrectangle',
        'imageline',
        'imagepng',
        'imagedestroy',
        'imagettftext',
        'imagettfbbox'
    ];
    
    foreach ($gd_functions as $func) {
        $requirements['gd_functions'][$func] = function_exists($func);
    }
}

// Check font availability
$requirements['fonts_available'] = [];
$font_paths = [
    '/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf',
    '/System/Library/Fonts/Arial.ttf',
    'arial.ttf',
    '/usr/share/fonts/TTF/arial.ttf'
];

foreach ($font_paths as $font_path) {
    $requirements['fonts_available'][$font_path] = file_exists($font_path);
}

// Check if we can create a simple test image
$requirements['test_image_creation'] = false;
if ($requirements['can_create_images']) {
    try {
        $test_img = imagecreatetruecolor(200, 100);
        $bg_color = imagecolorallocate($test_img, 102, 126, 234);
        $text_color = imagecolorallocate($test_img, 255, 255, 255);
        
        imagefill($test_img, 0, 0, $bg_color);
        
        // Try to add text (if TTF fonts are available)
        $font_path = null;
        foreach ($font_paths as $path) {
            if (file_exists($path)) {
                $font_path = $path;
                break;
            }
        }
        
        if ($font_path && function_exists('imagettftext')) {
            imagettftext($test_img, 20, 0, 10, 60, $text_color, $font_path, 'Test');
        } else {
            // Fallback to basic text
            imagestring($test_img, 5, 10, 40, 'Test', $text_color);
        }
        
        $requirements['test_image_creation'] = true;
        imagedestroy($test_img);
        
    } catch (Exception $e) {
        $requirements['test_image_error'] = $e->getMessage();
    }
}

// Check server environment
$requirements['server_software'] = $_SERVER['SERVER_SOFTWARE'] ?? 'Unknown';
$requirements['php_sapi'] = php_sapi_name();
$requirements['document_root'] = $_SERVER['DOCUMENT_ROOT'] ?? __DIR__;

// Check for common issues
$requirements['common_issues'] = [];

if (!$requirements['gd_available']) {
    $requirements['common_issues'][] = 'GD library is not installed or enabled';
}

if (!$requirements['can_create_images']) {
    $requirements['common_issues'][] = 'Cannot create images even though GD is available';
}

if (!$requirements['can_write_files']) {
    $requirements['common_issues'][] = 'Cannot write files to current directory';
}

if (empty(array_filter($requirements['fonts_available']))) {
    $requirements['common_issues'][] = 'No TTF fonts found for text rendering';
}

// Provide solutions
$requirements['solutions'] = [];

if (!$requirements['gd_available']) {
    $requirements['solutions'][] = 'Install GD library: sudo apt-get install php-gd (Ubuntu/Debian) or sudo yum install php-gd (CentOS/RHEL)';
    $requirements['solutions'][] = 'Enable GD extension in php.ini: extension=gd';
    $requirements['solutions'][] = 'Restart web server after installation';
}

if (!$requirements['can_write_files']) {
    $requirements['solutions'][] = 'Check directory permissions: chmod 755 ' . __DIR__;
    $requirements['solutions'][] = 'Check web server user permissions';
}

if (empty(array_filter($requirements['fonts_available']))) {
    $requirements['solutions'][] = 'Install system fonts: sudo apt-get install fonts-dejavu (Ubuntu/Debian)';
    $requirements['solutions'][] = 'Use a fallback font or create a simple image without text';
}

// Overall status
$requirements['overall_status'] = 'error';
if ($requirements['gd_available'] && $requirements['can_create_images']) {
    $requirements['overall_status'] = 'success';
} elseif ($requirements['gd_available']) {
    $requirements['overall_status'] = 'warning';
}

echo json_encode($requirements, JSON_PRETTY_PRINT);
?>