This document summarizes the fixes and improvements implemented to enhance the stability and functionality of the multiplayer mod for Kingdoms and Castles.

Implemented Fixes:

1. Improved Lobby Stability

Issue: Previously, joining a multiplayer lobby could lead to an immediate crash (NullReferenceException in PlayerEntryScript.cs).
Fix: Corrected the initialization order of UI components in PlayerEntryScript.cs to prevent NullReferenceExceptions, ensuring stable lobby entry.

2. Enhanced Session Cleanup

Issue: Users previously had to restart the entire game after leaving a multiplayer session to join or host a new one. This was due to residual game state and an aggressive cleanup that inadvertently shut down Steamworks.
Fix: Implemented a comprehensive CleanupMultiplayerSession() routine in Main.cs. This routine now properly resets static mod data (player lists, client/server states), and, crucially, no longer destroys the core KCMSteamManager (Steamworks API manager). This allows for seamless transitions between multiplayer sessions without game restarts.

3. Optimized Building Synchronization Performance

Issue: Rapid changes in building state (e.g., during construction) could generate excessive network traffic, potentially contributing to "poor connection" issues.
Fix: Implemented a throttling mechanism in BuildingStateManager.cs. Building state updates are now limited to 10 times per second per building, significantly reducing network spam while maintaining visual fluidity.

4. Resolved Villager Freezing

Issue: Villagers would sometimes freeze during gameplay, despite other game elements functioning correctly. This was caused by the game attempting to synchronize the state of already destroyed building components, leading to a cascade of errors.
Fix: Added a robust null check in BuildingStateManager.cs. If an observed building has been destroyed, its associated observer is now properly de-registered (by destroying its GameObject), preventing further errors and ensuring continuous game logic for villagers and other entities. This also handles cases where buildings are replaced (e.g., construction completed).

5. Fixed Map Desynchronization

Issue: When starting a new multiplayer game, clients often generated a different map than the host, even if the seed was specified. This was due to the host not sending the definitive world seed at the critical moment.
Fix: Modified ServerLobbyScript.cs to ensure that when the host clicks "Start Game", the current world seed (either from UI input or newly generated) is explicitly sent to all clients via a WorldSeed packet before the game starts. This guarantees all players generate the exact same map.

6. Reliable Save Game Transfer

Issue: Loading a saved multiplayer game would often fail for clients, resulting in an incomplete save file and desynchronized gameplay. This occurred because save file chunks were sent unreliably over the network.
Fix: Changed the save game chunk transfer in ClientConnected.cs to use Riptide's Reliable message send mode. This ensures that all parts of the save file are guaranteed to arrive at the client, allowing for complete and successful save game loading.

7. Compilation Errors & Warnings Addressed

All reported compilation errors and warnings (including issues with Packet.Send overloads and World.SeedFromText) have been investigated and resolved, ensuring the mod compiles cleanly.

Pending Task:

Resource Synchronization

Goal: Implement synchronization for player resources (Gold, Wood, Stone, Food) to ensure all players see consistent resource counts.
Status: Awaiting confirmation from the user regarding the exact FreeResourceType enum names (Wood, Stone, Food) to proceed with implementation.