tbd-station-14/Content.Shared/Chemistry/ReactiveSystem.cs

using Content.Shared.Administration.Logs;
using Content.Shared.Chemistry.Components;
using Content.Shared.Chemistry.Reaction;
using Content.Shared.Chemistry.Reagent;
using Content.Shared.Database;
using JetBrains.Annotations;
using Robust.Shared.Prototypes;
using Robust.Shared.Random;

namespace Content.Shared.Chemistry
{
    [UsedImplicitly]
    public sealed class ReactiveSystem : EntitySystem
    {
        [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
        [Dependency] private readonly IRobustRandom _robustRandom = default!;
        [Dependency] private readonly ISharedAdminLogManager _adminLogger = default!;

        public void DoEntityReaction(EntityUid uid, Solution solution, ReactionMethod method)
        {
            foreach (var reagent in solution.Contents.ToArray())
            {
                ReactionEntity(uid, method, reagent, solution);
            }
        }

        public void ReactionEntity(EntityUid uid, ReactionMethod method, ReagentQuantity reagentQuantity, Solution? source)
        {
            // We throw if the reagent specified doesn't exist.
            var proto = _prototypeManager.Index<ReagentPrototype>(reagentQuantity.Reagent.Prototype);
            ReactionEntity(uid, method, proto, reagentQuantity, source);
        }

        public void ReactionEntity(EntityUid uid, ReactionMethod method, ReagentPrototype proto,
            ReagentQuantity reagentQuantity, Solution? source)
        {
            if (!TryComp(uid, out ReactiveComponent? reactive))
                return;

            // If we have a source solution, use the reagent quantity we have left. Otherwise, use the reaction volume specified.
            var args = new ReagentEffectArgs(uid, null, source, proto,
                source?.GetReagentQuantity(reagentQuantity.Reagent) ?? reagentQuantity.Quantity, EntityManager, method, 1f);

            // First, check if the reagent wants to apply any effects.
            if (proto.ReactiveEffects != null && reactive.ReactiveGroups != null)
            {
                foreach (var (key, val) in proto.ReactiveEffects)
                {
                    if (!val.Methods.Contains(method))
                        continue;

                    if (!reactive.ReactiveGroups.ContainsKey(key))
                        continue;

                    if (!reactive.ReactiveGroups[key].Contains(method))
                        continue;

                    foreach (var effect in val.Effects)
                    {
                        if (!effect.ShouldApply(args, _robustRandom))
                            continue;

                        if (effect.ShouldLog)
                        {
                            var entity = args.SolutionEntity;
                            _adminLogger.Add(LogType.ReagentEffect, effect.LogImpact,
                                $"Reactive effect {effect.GetType().Name:effect} of reagent {proto.ID:reagent} with method {method} applied on entity {ToPrettyString(entity):entity} at {Transform(entity).Coordinates:coordinates}");
                        }

                        effect.Effect(args);
                    }
                }
            }

            // Then, check if the prototype has any effects it can apply as well.
            if (reactive.Reactions != null)
            {
                foreach (var entry in reactive.Reactions)
                {
                    if (!entry.Methods.Contains(method))
                        continue;

                    if (entry.Reagents != null && !entry.Reagents.Contains(proto.ID))
                        continue;

                    foreach (var effect in entry.Effects)
                    {
                        if (!effect.ShouldApply(args, _robustRandom))
                            continue;

                        if (effect.ShouldLog)
                        {
                            var entity = args.SolutionEntity;
                            _adminLogger.Add(LogType.ReagentEffect, effect.LogImpact,
                                $"Reactive effect {effect.GetType().Name:effect} of {ToPrettyString(entity):entity} using reagent {proto.ID:reagent} with method {method} at {Transform(entity).Coordinates:coordinates}");
                        }

                        effect.Effect(args);
                    }
                }
            }
        }
    }
}