tbd-station-14/Content.Server/Ninja/Systems/SpiderChargeSystem.cs

using Content.Server.Explosion.EntitySystems;
using Content.Server.GameTicking.Rules.Components;
using Content.Server.Mind;
using Content.Server.Objectives.Components;
using Content.Server.Popups;
using Content.Server.Roles;
using Content.Server.Sticky.Events;
using Content.Shared.Interaction;
using Content.Shared.Ninja.Components;
using Robust.Shared.GameObjects;

namespace Content.Server.Ninja.Systems;

/// <summary>
/// Prevents planting a spider charge outside of its location and handles greentext.
/// </summary>
public sealed class SpiderChargeSystem : EntitySystem
{
    [Dependency] private readonly MindSystem _mind = default!;
    [Dependency] private readonly PopupSystem _popup = default!;
    [Dependency] private readonly SharedTransformSystem _transform = default!;
    [Dependency] private readonly SpaceNinjaSystem _ninja = default!;

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

        SubscribeLocalEvent<SpiderChargeComponent, AttemptEntityStickEvent>(OnAttemptStick);
        SubscribeLocalEvent<SpiderChargeComponent, EntityStuckEvent>(OnStuck);
        SubscribeLocalEvent<SpiderChargeComponent, TriggerEvent>(OnExplode);
    }

    /// <summary>
    /// Require that the planter is a ninja and the charge is near the target warp point.
    /// </summary>
    private void OnAttemptStick(EntityUid uid, SpiderChargeComponent comp, AttemptEntityStickEvent args)
    {
        if (args.Cancelled)
            return;

        var user = args.User;

        if (!_mind.TryGetRole<NinjaRoleComponent>(user, out var _))
        {
            _popup.PopupEntity(Loc.GetString("spider-charge-not-ninja"), user, user);
            args.Cancelled = true;
            return;
        }

        // allow planting anywhere if there is no target, which should never happen
        if (!_mind.TryGetObjectiveComp<SpiderChargeConditionComponent>(user, out var obj) || obj.Target == null)
            return;

        // assumes warp point still exists
        var targetXform = Transform(obj.Target.Value);
        var locXform = Transform(args.Target);
        if (locXform.MapID != targetXform.MapID ||
            (_transform.GetWorldPosition(locXform) - _transform.GetWorldPosition(targetXform)).LengthSquared() > comp.Range * comp.Range)
        {
            _popup.PopupEntity(Loc.GetString("spider-charge-too-far"), user, user);
            args.Cancelled = true;
            return;
        }
    }

    /// <summary>
    /// Allows greentext to occur after exploding.
    /// </summary>
    private void OnStuck(EntityUid uid, SpiderChargeComponent comp, EntityStuckEvent args)
    {
        comp.Planter = args.User;
    }

    /// <summary>
    /// Handles greentext after exploding.
    /// Assumes it didn't move and the target was destroyed so be nice.
    /// </summary>
    private void OnExplode(EntityUid uid, SpiderChargeComponent comp, TriggerEvent args)
    {
        if (!TryComp<SpaceNinjaComponent>(comp.Planter, out var ninja))
            return;

        // assumes the target was destroyed, that the charge wasn't moved somehow
        _ninja.DetonatedSpiderCharge((comp.Planter.Value, ninja));
    }
}