package examples.routing;

import com.vtence.molecule.WebServer;
import com.vtence.molecule.routing.DynamicRoutes;

import java.io.IOException;

/**
 * <p>
 *     This is a simple example showing how to define routes and how to use route patterns containing named
 *     parameters. Named parameters are accessible as normal request parameters.
 * </p>
 * <p>
 *     We want to route incoming requests based on their paths and verbs, so we provide route patterns as strings.
 *     If your matching logic is more sophisticated, you can also provide custom matchers.
 * </p>
 */
public class RoutingExample {

    public void run(WebServer server) throws IOException {
        // We start the server by providing a set of routes, which creates a router to dispatch
        // requests to different endpoints.
        server.start(new DynamicRoutes() {{
            // Routes are matched in the order they are defined. The first one that matches the request will be
            // invoked.

            // Route all requests to the root path - ignoring the verb - to an endpoint that responds with "Welcome!"
            map("/").to((request, response) -> response.done("Welcome!"));

            // Route POST requests to /login to an endpoint that simulates login. It simply reads the username
            // from the request parameters and redirects to /users/username.
            post("/login").to((request, response) -> {
                String username = request.parameter("username");
                response.redirectTo("/hello/" + username)
                        .done();
            });

            // Route GET requests to /hello/username to an endpoint that renders and HTML page with
            // a greeting message for our user. We use a route pattern that includes a named segment (:username).
            // The bound parameter is available as a request parameter.
            get("/hello/:username").to((request, response) -> {
                response.contentType("text/html");
                response.done(
                        "<html>" +
                        "<body>" +
                        "<h3>Hello, " + request.parameter("username") + "</h3>" +
                        "</body>" +
                        "</html>"
                );
            });
        }});
    }

    public static void main(String[] args) throws IOException {
        RoutingExample example = new RoutingExample();
        // Run the default web server
        WebServer webServer = WebServer.create();
        example.run(webServer);
        System.out.println("Access at " + webServer.uri());
    }
}