tbd-station-14/Content.Server/Payload/EntitySystems/PayloadSystem.cs

using Content.Server.Administration.Logs;
using Content.Server.Chemistry.EntitySystems;
using Content.Server.Explosion.EntitySystems;
using Content.Shared.Chemistry.Components;
using Content.Shared.Chemistry.Reaction;
using Content.Shared.Database;
using Content.Shared.Payload.Components;
using Content.Shared.Tag;
using Robust.Shared.Containers;
using Robust.Shared.Serialization.Manager;
using Robust.Shared.Utility;

namespace Content.Server.Payload.EntitySystems;

public sealed class PayloadSystem : EntitySystem
{
    [Dependency] private readonly TagSystem _tagSystem = default!;
    [Dependency] private readonly SolutionContainerSystem _solutionSystem = default!;
    [Dependency] private readonly SharedChemicalReactionSystem _chemistrySystem = default!;
    [Dependency] private readonly AdminLogSystem _logSystem = default!;
    [Dependency] private readonly IComponentFactory _componentFactory = default!;
    [Dependency] private readonly ISerializationManager _serializationManager = default!;

    public override void Initialize()
    {
        base.Initialize();

        SubscribeLocalEvent<PayloadCaseComponent, TriggerEvent>(OnCaseTriggered);
        SubscribeLocalEvent<PayloadTriggerComponent, TriggerEvent>(OnTriggerTriggered);
        SubscribeLocalEvent<PayloadCaseComponent, EntInsertedIntoContainerMessage>(OnEntityInserted);
        SubscribeLocalEvent<PayloadCaseComponent, EntRemovedFromContainerMessage>(OnEntityRemoved);
        SubscribeLocalEvent<ChemicalPayloadComponent, TriggerEvent>(HandleChemicalPayloadTrigger);
    }

    private void OnCaseTriggered(EntityUid uid, PayloadCaseComponent component, TriggerEvent args)
    {
        if (!TryComp(uid, out ContainerManagerComponent? contMan))
            return;

        // Pass trigger event onto all contained payloads. Payload capacity configurable by construction graphs.
        foreach (var container in contMan.Containers.Values)
        {
            foreach (var entity in container.ContainedEntities)
            {
                if (_tagSystem.HasTag(entity, "Payload"))
                    RaiseLocalEvent(entity, args, false);
            }
        }
    }

    private void OnTriggerTriggered(EntityUid uid, PayloadTriggerComponent component, TriggerEvent args)
    {
        if (!component.Active)
            return;

        if (Transform(uid).ParentUid is not { Valid: true } parent)
            return;

        // Ensure we don't enter a trigger-loop
        DebugTools.Assert(!_tagSystem.HasTag(uid, "Payload"));

        RaiseLocalEvent(parent, args, false);
    }

    private void OnEntityInserted(EntityUid uid, PayloadCaseComponent _, EntInsertedIntoContainerMessage args)
    {
        if (!TryComp(args.Entity, out PayloadTriggerComponent? trigger))
            return;

        trigger.Active = true;

        if (trigger.Components == null)
            return;

        // ANY payload trigger that gets inserted can grant components. It is up to the construction graphs to determine trigger capacity.
        foreach (var (name, data) in trigger.Components)
        {
            if (!_componentFactory.TryGetRegistration(name, out var registration))
                continue;

            if (HasComp(uid, registration.Type))
                continue;

            if (_componentFactory.GetComponent(registration.Type) is not Component component)
                continue;

            component.Owner = uid;

            if (_serializationManager.Copy(data, component, null) is Component copied)
                EntityManager.AddComponent(uid, copied);

            trigger.GrantedComponents.Add(registration.Type);
        }
    }

    private void OnEntityRemoved(EntityUid uid, PayloadCaseComponent component, EntRemovedFromContainerMessage args)
    {
        if (!TryComp(args.Entity, out PayloadTriggerComponent? trigger))
            return;

        trigger.Active = false;

        foreach (var type in trigger.GrantedComponents)
        {
            EntityManager.RemoveComponent(uid, type);
        }

        trigger.GrantedComponents.Clear();
    }

    private void HandleChemicalPayloadTrigger(EntityUid uid, ChemicalPayloadComponent component, TriggerEvent args)
    {
        if (component.BeakerSlotA.Item is not EntityUid beakerA
            || component.BeakerSlotB.Item is not EntityUid beakerB
            || !TryComp(beakerA, out FitsInDispenserComponent? compA)
            || !TryComp(beakerB, out FitsInDispenserComponent? compB)
            || !_solutionSystem.TryGetSolution(beakerA, compA.Solution, out var solutionA)
            || !_solutionSystem.TryGetSolution(beakerB, compB.Solution, out var solutionB)
            || solutionA.TotalVolume == 0
            || solutionB.TotalVolume == 0)
        {
            return;
        }

        var solStringA = SolutionContainerSystem.ToPrettyString(solutionA);
        var solStringB = SolutionContainerSystem.ToPrettyString(solutionB);

        _logSystem.Add(LogType.ChemicalReaction,
            $"Chemical bomb payload {ToPrettyString(uid):payload} at {Transform(uid).MapPosition:location} is combining two solutions: {solStringA:solutionA} and {solStringB:solutionB}");

        solutionA.MaxVolume += solutionB.MaxVolume;
        _solutionSystem.TryAddSolution(beakerA, solutionA, solutionB);
        solutionB.RemoveAllSolution();

        // The grenade might be a dud. Redistribute solution:
        var tmpSol = _solutionSystem.SplitSolution(beakerA, solutionA, solutionA.CurrentVolume * solutionB.MaxVolume / solutionA.MaxVolume);
        _solutionSystem.TryAddSolution(beakerB, solutionB, tmpSol);
        solutionA.MaxVolume -= solutionB.MaxVolume;
        _solutionSystem.UpdateChemicals(beakerA, solutionA, false);
    }
}