package com.hubilon;

import com.hubilon.config.ConfigService;
import com.hubilon.handler.ConfigHandler;
import com.hubilon.handler.ConfigsHandler;
import com.hubilon.handler.PingHandler;
import com.hubilon.handler.ProxyHandler;
import com.hubilon.handler.StaticHandler;
import com.hubilon.util.DebugState;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.file.Path;
import java.util.concurrent.Executors;

/** Binds the embedded HTTP server, scanning ports like run.ps1 (startPort..startPort+24). */
public final class ApiDiffServer {

    private static final int PORT_SCAN_RANGE = 25;

    private final HttpServer server;
    private final int port;

    private ApiDiffServer(HttpServer server, int port) {
        this.server = server;
        this.port = port;
    }

    public static ApiDiffServer create(int startPort, Path workDir, String preferredConfig, DebugState debugState) throws IOException {
        HttpServer server = null;
        int boundPort = -1;
        for (int candidate = startPort; candidate < startPort + PORT_SCAN_RANGE; candidate++) {
            try {
                server = HttpServer.create(new InetSocketAddress("localhost", candidate), 0);
                boundPort = candidate;
                break;
            } catch (IOException e) {
                // port in use, try the next candidate
            }
        }
        if (server == null) {
            throw new IOException("Could not bind any port in range " + startPort + ".." + (startPort + PORT_SCAN_RANGE - 1));
        }

        ConfigService configService = new ConfigService(workDir);
        configService.ensureSampleConfigExists();

        server.createContext("/", new StaticHandler());
        server.createContext("/configs", new ConfigsHandler(configService, preferredConfig));
        server.createContext("/config", new ConfigHandler(configService, preferredConfig, debugState));
        server.createContext("/proxy", new ProxyHandler(debugState));
        server.createContext("/ping", new PingHandler(boundPort));
        server.setExecutor(Executors.newFixedThreadPool(8));

        return new ApiDiffServer(server, boundPort);
    }

    public void start() {
        server.start();
    }

    public void stop() {
        server.stop(0);
    }

    public int getPort() {
        return port;
    }

    public String getBaseUrl() {
        return "http://localhost:" + port + "/";
    }
}