/*
 * Copyright (c) 2025  blog-software-java developers
 * blog-software-java is licensed under the GNU General Public License. See the LICENSE.md file
 * in the project root for the full license text.
 */

package eu.m724.blog.server;

import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.SimpleFileServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.file.Path;

/**
 * The {@code Server} class represents a basic HTTP server designed to serve files
 * from a specified webroot directory.<br>
 * {@link SimpleFileServer} is used.
 */
public class Server {
    private static final Logger LOGGER = LoggerFactory.getLogger(Server.class);

    private final Path sitePath;
    private final String contextPath;
    private InetSocketAddress listenAddress;

    /**
     * Constructs a {@link Server} instance with the specified webroot directory
     * and the specified listening address.
     *
     * @param sitePath the directory from which files will be served
     * @param contextPath TODO explain
     * @param listenAddress the address and port the server will listen on
     */
    public Server(Path sitePath, String contextPath, InetSocketAddress listenAddress) {
        this.sitePath = sitePath;
        this.contextPath = contextPath;
        this.listenAddress = listenAddress;
    }

    /**
     * Constructs a {@link Server} instance with the specified webroot directory.
     * The server will bind to the localhost address with a dynamically chosen port.
     *
     * @param sitePath the directory from which files will be served
     * @param contextPath TODO explain
     */
    public Server(Path sitePath, String contextPath) {
        this(sitePath, contextPath, new InetSocketAddress("localhost", 0));
    }

    /**
     * Starts an HTTP server on the specified listen address.
     *
     * @throws IOException if an I/O error occurs during server initialization
     */
    public void start() throws IOException {
        var server = HttpServer.create(listenAddress, 0);
        server.createContext(contextPath, SimpleFileServer.createFileHandler(sitePath.toAbsolutePath()));
        server.start();

        LOGGER.info("Server started on http:/{}", server.getAddress());

        this.listenAddress = server.getAddress();
    }

    /**
     * Attempts to open the default web browser and navigate to the server's URL.
     */
    public void openBrowser() {
        try {
            var process = Runtime.getRuntime().exec(new String[] { "xdg-open", "http://" + listenAddress.getHostString() + ":" + listenAddress.getPort() + contextPath });
            var code = process.waitFor();
            if (code != 0) {
                throw new Exception("Exit code " + code);
            }

            LOGGER.info("Opened browser"); // TODO make this debug?
        } catch (Exception e) {
            LOGGER.error("Failed to open browser: {}", String.valueOf(e));
        }
    }
}