using Astralis;
using Invercargill;
using Invercargill.DataStructures;

/**
 * FileServer Example
 * 
 * A static file server that serves files from a directory specified
 * on the command line. Supports compression via gzip, brotli, and zstd.
 * 
 * Usage: file-server <directory> [port]
 * 
 * Examples:
 *   file-server /var/www/html
 *   file-server ./public 8080
 */

// Root endpoint that shows server info
class ServerInfoEndpoint : Object, Endpoint {
    private string served_directory;
    private int port;
    
    public ServerInfoEndpoint(string served_directory, int port) {
        this.served_directory = served_directory;
        this.port = port;
    }
    
    public async HttpResult handle_request(HttpContext http_context, RouteContext route) throws Error {
        var info = @"Astralis File Server
        
Serving: $served_directory
Port: $port

Available compression: gzip, brotli, zstd

Endpoints:
  /**                 - Serves files from the directory
  /__server_info      - This information page

Try:
  curl http://localhost:$port/
  curl --compressed http://localhost:$port/style.css
";
        return new HttpStringResult(info)
            .set_header("Content-Type", "text/plain");
    }
}

void main(string[] args) {
    // Parse command line arguments
    if (args.length < 2) {
        printerr("Usage: %s <directory> [port]\n", args[0]);
        printerr("\nServes files from the specified directory over HTTP.\n");
        printerr("Supports compression: gzip, brotli, zstd\n");
        printerr("\nExamples:\n");
        printerr("  %s /var/www/html\n", args[0]);
        printerr("  %s ./public 8080\n", args[0]);
        Process.exit(1);
    }
    
    string directory = args[1];
    int port = args.length > 2 ? int.parse(args[2]) : 8080;
    
    // Validate directory exists
    var dir_file = File.new_for_path(directory);
    if (!dir_file.query_exists()) {
        printerr("Error: Directory '%s' does not exist\n", directory);
        Process.exit(1);
    }
    
    // Check if it's actually a directory
    try {
        var info = dir_file.query_info("standard::type", FileQueryInfoFlags.NONE);
        if (info.get_file_type() != FileType.DIRECTORY) {
            printerr("Error: '%s' is not a directory\n", directory);
            Process.exit(1);
        }
    } catch (Error e) {
        printerr("Error checking directory: %s\n", e.message);
        Process.exit(1);
    }
    
    // Resolve to absolute path
    string absolute_path = dir_file.get_path();
    
    // Create the filesystem resource with deep matching
    FilesystemResource file_resource;
    try {
        file_resource = new FilesystemResource("/**", absolute_path);
        file_resource.allow_directory_listing = true;
        file_resource.index_file = "index.html";
    } catch (FilesystemResourceError e) {
        printerr("Error creating file resource: %s\n", e.message);
        Process.exit(1);
    }
    
    // Print startup information
    print("╔══════════════════════════════════════════════════════════════╗\n");
    print("║                  Astralis File Server                        ║\n");
    print("╠══════════════════════════════════════════════════════════════╣\n");
    print(@"║  Serving: $(absolute_path)");
    if (absolute_path.length < 50) {
        for (int i = 0; i < 50 - absolute_path.length; i++) print(" ");
    }
    print(" ║\n");
    print(@"║  Port:    $port");
    for (int i = 0; i < 50 - port.to_string().length; i++) print(" ");
    print(" ║\n");
    print("╠══════════════════════════════════════════════════════════════╣\n");
    print("║  Compression: gzip, brotli, zstd                             ║\n");
    print("╠══════════════════════════════════════════════════════════════╣\n");
    print("║  Try:                                                        ║\n");
    print(@"║    http://localhost:$port/");
    for (int i = 0; i < 50 - 21 - port.to_string().length; i++) print(" ");
    print(" ║\n");
    print(@"║    http://localhost:$port/__server_info");
    for (int i = 0; i < 50 - 35 - port.to_string().length; i++) print(" ");
    print(" ║\n");
    print("╚══════════════════════════════════════════════════════════════╝\n");
    print("\nPress Ctrl+C to stop the server\n\n");
    
    // Create the application and register endpoints
    var application = new WebApplication(port);
    
    // Register compression components
    application.container.register_singleton<GzipCompressor>(() => new GzipCompressor());
    application.container.register_singleton<ZstdCompressor>(() => new ZstdCompressor());
    application.container.register_singleton<BrotliCompressor>(() => new BrotliCompressor());
    
    // Register server info endpoint
    application.container.register_scoped<Endpoint>(() => new ServerInfoEndpoint(absolute_path, port))
        .with_metadata<EndpointRoute>(new EndpointRoute("/__server_info"));
    
    // Register filesystem resource endpoint as singleton (holds configuration)
    // The factory creates the instance and the container caches it
    application.container.register_singleton<Endpoint>(() => file_resource)
        .with_metadata<EndpointRoute>(new EndpointRoute("/**"));
    
    // Run the server
    application.run();
}