using System;
using System.Numerics;
using Robust.Shared.Configuration;
using Robust.Shared.GameObjects;
using Robust.Shared.IoC;
using Robust.Shared.Maths;
using Robust.Shared.Network;
using Robust.Shared.Physics;

namespace Robust.Shared.ComponentTrees;

public abstract partial class SharedLightTreeSystem : ComponentTreeSystem<LightTreeComponent, SharedPointLightComponent>
{
    [Dependency] private IConfigurationManager _cfg = default!;
    [Dependency] private INetManager _net = default!;

    public bool IsAvailable => Enabled;

    #region Component Tree Overrides
    protected override bool DoFrameUpdate => true;
    protected override bool DoTickUpdate => false;
    protected override bool Recursive => true;
    protected override int InitialCapacity => 128;
    protected override bool Enabled => _net.IsClient || _cfg.GetCVar(CVars.LookupEnableServerLightTree);

    protected override Box2 ExtractAabb(in ComponentTreeEntry<SharedPointLightComponent> entry, Vector2 pos, Angle rot)
    {
        var radius = Math.Min(entry.Component.Radius, _cfg.GetCVar(CVars.MaxLightRadius)) + entry.Component.Offset.Length();
        var radiusVec = new Vector2(radius, radius);
        return new Box2(pos - radiusVec, pos + radiusVec);
    }

    protected override Box2 ExtractAabb(in ComponentTreeEntry<SharedPointLightComponent> entry)
    {
        if (entry.Component.TreeUid == null)
            return default;

        var pos = XformSystem.GetRelativePosition(entry.Transform, entry.Component.TreeUid.Value);
        return ExtractAabb(in entry, pos, default);
    }
    #endregion
}