using Unity.Netcode;
using Unity.Netcode.Transports.UTP;
using UnityEngine;
using UnityEngine.SceneManagement;

[RequireComponent(typeof(NetworkManager), typeof(UnityTransport))]
public sealed class FriendslopSession : MonoBehaviour
{
    public static FriendslopSession Instance { get; private set; }
    [SerializeField] private NetworkObject playerPrefab;
    [SerializeField] private string menuScene = "MainMenu";
    [SerializeField] private string gameplayScene = "Factory";
    public string Status { get; private set; } = "Ready.";
    public bool IsOnline => NetworkManager.Singleton != null && NetworkManager.Singleton.IsListening;

    private NetworkManager manager;
    private UnityTransport transport;

    private void Awake()
    {
        if (Instance != null) { Destroy(gameObject); return; }
        Instance = this;
        DontDestroyOnLoad(gameObject);
        manager = GetComponent<NetworkManager>();
        transport = GetComponent<UnityTransport>();
        manager.NetworkConfig.NetworkTransport = transport;
        manager.NetworkConfig.PlayerPrefab = playerPrefab.gameObject;
        manager.NetworkConfig.EnableSceneManagement = true;
        manager.OnServerStarted += LoadGameplayForHost;
    }

    private void Start() => SceneManager.LoadScene(menuScene);

    private void OnDestroy()
    {
        if (manager != null) manager.OnServerStarted -= LoadGameplayForHost;
        if (Instance == this) Instance = null;
    }

    public bool StartHost(ushort port)
    {
        transport.SetConnectionData("0.0.0.0", port, "0.0.0.0");
        Status = manager.StartHost() ? $"Host started on {port}." : "Host failed to start.";
        return manager.IsHost;
    }

    public bool StartClient(string address, ushort port)
    {
        transport.SetConnectionData(address.Trim(), port);
        bool started = manager.StartClient();
        Status = started ? $"Connecting to {address}:{port}..." : "Client failed to start.";
        return started;
    }

    private void LoadGameplayForHost()
    {
        Status = "Loading factory...";
        manager.SceneManager.LoadScene(gameplayScene, LoadSceneMode.Single);
    }
}