tbd-station-14/Content.Client/Pinpointer/NavMapSystem.cs

using Content.Shared.Atmos;
using Content.Shared.Pinpointer;
using Robust.Shared.GameStates;

namespace Content.Client.Pinpointer;

public sealed partial class NavMapSystem : SharedNavMapSystem
{
    public override void Initialize()
    {
        base.Initialize();

        SubscribeLocalEvent<NavMapComponent, ComponentHandleState>(OnHandleState);
    }

    private void OnHandleState(EntityUid uid, NavMapComponent component, ref ComponentHandleState args)
    {
        if (args.Current is not NavMapComponentState state)
            return;

        if (!state.FullState)
        {
            foreach (var index in component.Chunks.Keys)
            {
                if (!state.AllChunks!.Contains(index))
                    component.Chunks.Remove(index);
            }

            foreach (var beacon in component.Beacons)
            {
                if (!state.AllBeacons!.Contains(beacon))
                    component.Beacons.Remove(beacon);
            }
        }
        else
        {
            foreach (var index in component.Chunks.Keys)
            {
                if (!state.Chunks.ContainsKey(index))
                    component.Chunks.Remove(index);
            }

            foreach (var beacon in component.Beacons)
            {
                if (!state.Beacons.Contains(beacon))
                    component.Beacons.Remove(beacon);
            }
        }

        foreach (var (origin, chunk) in state.Chunks)
        {
            var newChunk = new NavMapChunk(origin);

            for (var i = 0; i < NavMapComponent.Categories; i++)
            {
                var newData = chunk[i];

                if (newData == null)
                    continue;

                newChunk.TileData[i] = new(newData);
            }

            component.Chunks[origin] = newChunk;
        }

        foreach (var beacon in state.Beacons)
        {
            component.Beacons.Add(beacon);
        }
    }
}