package guestbook;

import gg.jte.ContentType;
import gg.jte.TemplateEngine;
import gg.jte.resolve.DirectoryCodeResolver;
import io.javalin.Javalin;
import io.javalin.http.Context;
import io.javalin.rendering.template.JavalinJte;

import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * No-JS guestbook server.
 *
 * One page (rendered by JTE on every request) shows the list of messages
 * plus a form. The form POSTs to /submit, which appends to the in-memory
 * list and then re-renders the page directly.
 */
public class Server {

    private static final List<Message> MESSAGES = new ArrayList<>();

    public static void main(String[] args) {
        // JTE template engine, reading templates from ./templates at runtime
        // (so edits hot-reload without a rebuild).
        TemplateEngine engine = TemplateEngine.create(
                new DirectoryCodeResolver(Path.of("templates")),
                ContentType.Html);

        Javalin.create(config -> {
            config.fileRenderer(new JavalinJte(engine));

            config.routes.get("/", Server::handleIndex);
            config.routes.post("/submit", Server::handleSubmit);
        }).start(8331);
    }

    private static void handleIndex(Context ctx) {
        ctx.render("index.jte", Map.of("messages", MESSAGES));
    }

    private static void handleSubmit(Context ctx) {
        String name = ctx.formParam("name");
        String message = ctx.formParam("message");
        if (name != null && !name.isBlank() && message != null && !message.isBlank()) {
            MESSAGES.add(new Message(name, message));
        }
        ctx.render("index.jte", Map.of("messages", MESSAGES));
    }
}