using Game.Scripts.Runtime.Data;
using Game.Scripts.Runtime.Game;
using Game.Scripts.Runtime.Spawning;
using Steamworks;
using UnityEngine;

namespace MegaKoop.Game.Networking
{
    [DefaultExecutionOrder(-140)]
    [DisallowMultipleComponent]
    public class SteamGameControllerNetworkBridge : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] private GameController gameController;
        [SerializeField] private EnemySpawner enemySpawner;

        [Header("Heartbeat")]
        [SerializeField, Min(0.1f)] private float heartbeatInterval = 0.5f;

        private SteamCoopNetworkManager networkManager;
        private bool handlersRegistered;
        private bool controllerSubscribed;
        private bool cachedAuthority;
        private float heartbeatTimer;
        private int lastWaveBroadcast = -1;

        private void Awake()
        {
            gameController ??= GetComponent<GameController>();
            enemySpawner ??= GetComponent<EnemySpawner>();

            cachedAuthority = DetermineAuthority();
            ApplyAuthorityOverride(cachedAuthority);
            RegisterBossDefinitions();
        }

        private void OnEnable()
        {
            RefreshNetworkManager();
            RegisterHandlers();
            SubscribeControllerEvents();

            cachedAuthority = DetermineAuthority();
            ApplyAuthorityOverride(cachedAuthority);
            heartbeatTimer = heartbeatInterval;
            RegisterBossDefinitions();
        }

        private void OnDisable()
        {
            UnsubscribeControllerEvents();
            UnregisterHandlers();
        }

        private void Update()
        {
            RefreshNetworkManager();

            bool authority = DetermineAuthority();
            if (authority != cachedAuthority)
            {
                cachedAuthority = authority;
                ApplyAuthorityOverride(authority);
            }

            if (authority)
            {
                RunHeartbeat(Time.deltaTime);
            }
        }

        private void RunHeartbeat(float deltaTime)
        {
            heartbeatTimer -= deltaTime;
            if (heartbeatTimer > 0f)
            {
                return;
            }

            heartbeatTimer = Mathf.Max(0.1f, heartbeatInterval);
            SendState(GameStateEvent.Heartbeat, lastWaveBroadcast);
        }

        private void SubscribeControllerEvents()
        {
            if (gameController == null || controllerSubscribed)
            {
                return;
            }

            gameController.OnGameStarted += HandleGameStarted;
            gameController.OnGamePaused += HandleGamePaused;
            gameController.OnGameResumed += HandleGameResumed;
            gameController.OnGameStopped += HandleGameStopped;
            gameController.OnWaveStarted += HandleWaveStarted;
            gameController.OnBossSpawned += HandleBossSpawned;
            controllerSubscribed = true;
        }

        private void UnsubscribeControllerEvents()
        {
            if (gameController == null || !controllerSubscribed)
            {
                return;
            }

            gameController.OnGameStarted -= HandleGameStarted;
            gameController.OnGamePaused -= HandleGamePaused;
            gameController.OnGameResumed -= HandleGameResumed;
            gameController.OnGameStopped -= HandleGameStopped;
            gameController.OnWaveStarted -= HandleWaveStarted;
            gameController.OnBossSpawned -= HandleBossSpawned;
            controllerSubscribed = false;
        }

        private void HandleGameStarted()
        {
            if (!DetermineAuthority())
            {
                return;
            }

            SendState(GameStateEvent.Started, -1);
            lastWaveBroadcast = gameController != null ? gameController.CurrentWaveIndex : -1;
        }

        private void HandleGamePaused()
        {
            if (!DetermineAuthority())
            {
                return;
            }

            SendState(GameStateEvent.Paused, gameController != null ? gameController.CurrentWaveIndex : -1);
        }

        private void HandleGameResumed()
        {
            if (!DetermineAuthority())
            {
                return;
            }

            SendState(GameStateEvent.Resumed, gameController != null ? gameController.CurrentWaveIndex : -1);
        }

        private void HandleGameStopped()
        {
            if (!DetermineAuthority())
            {
                return;
            }

            SendState(GameStateEvent.Stopped, gameController != null ? gameController.CurrentWaveIndex : -1);
            lastWaveBroadcast = -1;
        }

        private void HandleWaveStarted(int waveIndex)
        {
            if (!DetermineAuthority())
            {
                return;
            }

            int previousWave = lastWaveBroadcast >= 0 ? lastWaveBroadcast : waveIndex - 1;
            lastWaveBroadcast = waveIndex;
            SendState(GameStateEvent.WaveAdvanced, previousWave);
        }

        private void HandleBossSpawned(EnemyDefinition boss, int count)
        {
            if (!DetermineAuthority())
            {
                return;
            }

            EnemyDefinitionRegistry.Register(boss);
            string definitionId = EnemyDefinitionRegistry.ResolveId(boss);
            SendState(GameStateEvent.BossSpawned, lastWaveBroadcast, definitionId, count);
        }

        private void SendState(GameStateEvent evt, int previousWave, string definitionId = "", int count = 0)
        {
            if (networkManager == null || gameController == null)
            {
                return;
            }

            float elapsed = gameController.Elapsed;
            int currentWave = gameController.CurrentWaveIndex;
            bool isPaused = gameController.IsPaused;
            bool isRunning = gameController.IsGameActive;

            var message = new GameStateMessage(evt, elapsed, currentWave, previousWave, isPaused, isRunning, definitionId, count);
            byte[] payload = GameStateMessage.Serialize(message);
            var sendType = evt == GameStateEvent.Heartbeat ? EP2PSend.k_EP2PSendUnreliableNoDelay : EP2PSend.k_EP2PSendReliable;
            networkManager.SendToAll(NetworkMessageType.GameState, payload, sendType);
        }

        private void RegisterHandlers()
        {
            if (handlersRegistered)
            {
                return;
            }

            RefreshNetworkManager();
            if (networkManager == null)
            {
                return;
            }

            networkManager.RegisterHandler(NetworkMessageType.GameState, HandleGameStateMessage);
            handlersRegistered = true;
        }

        private void UnregisterHandlers()
        {
            if (!handlersRegistered || networkManager == null)
            {
                return;
            }

            networkManager.UnregisterHandler(NetworkMessageType.GameState, HandleGameStateMessage);
            handlersRegistered = false;
        }

        private void HandleGameStateMessage(NetworkMessage message)
        {
            if (DetermineAuthority())
            {
                return;
            }

            GameStateMessage state = GameStateMessage.Deserialize(message.Payload);
            ApplyRemoteState(state);
        }

        private void ApplyRemoteState(GameStateMessage state)
        {
            if (gameController == null)
            {
                return;
            }

            switch (state.Event)
            {
                case GameStateEvent.Started:
                    if (!gameController.IsGameActive)
                    {
                        gameController.StartGame();
                    }

                    gameController.SetElapsedFromRemote(state.Elapsed);
                    gameController.SetRunningFlagsFromRemote(state.IsRunning, state.IsPaused);
                    gameController.ApplyRemoteWaveStarted(state.CurrentWave);
                    lastWaveBroadcast = state.CurrentWave;
                    break;

                case GameStateEvent.Paused:
                    if (!gameController.IsPaused && gameController.IsGameActive)
                    {
                        gameController.PauseGame();
                    }

                    gameController.SetElapsedFromRemote(state.Elapsed);
                    gameController.SetRunningFlagsFromRemote(state.IsRunning, state.IsPaused);
                    break;

                case GameStateEvent.Resumed:
                    if (gameController.IsPaused)
                    {
                        gameController.ResumeGame();
                    }

                    gameController.SetElapsedFromRemote(state.Elapsed);
                    gameController.SetRunningFlagsFromRemote(state.IsRunning, state.IsPaused);
                    break;

                case GameStateEvent.Stopped:
                    if (gameController.IsGameActive)
                    {
                        gameController.StopGame();
                    }

                    lastWaveBroadcast = -1;
                    gameController.SetElapsedFromRemote(state.Elapsed);
                    gameController.SetRunningFlagsFromRemote(state.IsRunning, state.IsPaused);
                    break;

                case GameStateEvent.WaveAdvanced:
                    gameController.SetElapsedFromRemote(state.Elapsed);
                    gameController.ApplyRemoteWaveAdvance(state.PreviousWave, state.CurrentWave);
                    lastWaveBroadcast = state.CurrentWave;
                    break;

                case GameStateEvent.BossSpawned:
                    gameController.SetElapsedFromRemote(state.Elapsed);
                    if (EnemyDefinitionRegistry.TryGet(state.DefinitionId, out var bossDefinition))
                    {
                        gameController.ApplyRemoteBossSpawned(bossDefinition, state.Count);
                    }
                    break;

                case GameStateEvent.Heartbeat:
                    gameController.SetElapsedFromRemote(state.Elapsed);
                    gameController.SetRunningFlagsFromRemote(state.IsRunning, state.IsPaused);
                    if (state.CurrentWave >= 0 && state.CurrentWave != gameController.CurrentWaveIndex)
                    {
                        gameController.ApplyRemoteWaveAdvance(gameController.CurrentWaveIndex, state.CurrentWave);
                        lastWaveBroadcast = state.CurrentWave;
                    }
                    break;
            }
        }

        private void RefreshNetworkManager()
        {
            if (networkManager == null)
            {
                networkManager = SteamCoopNetworkManager.Instance;
            }
        }

        private bool DetermineAuthority()
        {
            RefreshNetworkManager();
            if (networkManager == null)
            {
                return true;
            }

            if (!networkManager.IsConnected)
            {
                return true;
            }

            return networkManager.IsHost;
        }

        private void ApplyAuthorityOverride(bool authority)
        {
            gameController?.SetAuthorityOverride(authority);
            enemySpawner?.SetAuthorityOverride(authority);
        }

        private void RegisterBossDefinitions()
        {
            if (gameController?.BossSchedule?.Events == null)
            {
                return;
            }

            foreach (var bossEvent in gameController.BossSchedule.Events)
            {
                if (bossEvent?.Boss == null)
                {
                    continue;
                }

                EnemyDefinitionRegistry.Register(bossEvent.Boss);
            }
        }
    }
}