tbd-station-14/Content.Server/Medical/HealthAnalyzerSystem.cs

using Content.Server.Body.Components;
using Content.Server.Chemistry.Containers.EntitySystems;
using Content.Server.Medical.Components;
using Content.Server.PowerCell;
using Content.Server.Temperature.Components;
using Content.Shared.Damage;
using Content.Shared.DoAfter;
using Content.Shared.Interaction;
using Content.Shared.Interaction.Events;
using Content.Shared.MedicalScanner;
using Content.Shared.Mobs.Components;
using Content.Shared.PowerCell;
using Robust.Server.GameObjects;
using Robust.Shared.Audio.Systems;
using Robust.Shared.Containers;
using Robust.Shared.Player;
using Robust.Shared.Timing;

namespace Content.Server.Medical;

public sealed class HealthAnalyzerSystem : EntitySystem
{
    [Dependency] private readonly IGameTiming _timing = default!;
    [Dependency] private readonly PowerCellSystem _cell = default!;
    [Dependency] private readonly SharedAudioSystem _audio = default!;
    [Dependency] private readonly SharedDoAfterSystem _doAfterSystem = default!;
    [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
    [Dependency] private readonly UserInterfaceSystem _uiSystem = default!;
    [Dependency] private readonly TransformSystem _transformSystem = default!;

    public override void Initialize()
    {
        SubscribeLocalEvent<HealthAnalyzerComponent, AfterInteractEvent>(OnAfterInteract);
        SubscribeLocalEvent<HealthAnalyzerComponent, HealthAnalyzerDoAfterEvent>(OnDoAfter);
        SubscribeLocalEvent<HealthAnalyzerComponent, EntGotInsertedIntoContainerMessage>(OnInsertedIntoContainer);
        SubscribeLocalEvent<HealthAnalyzerComponent, PowerCellSlotEmptyEvent>(OnPowerCellSlotEmpty);
        SubscribeLocalEvent<HealthAnalyzerComponent, DroppedEvent>(OnDropped);
    }

    public override void Update(float frameTime)
    {
        var analyzerQuery = EntityQueryEnumerator<HealthAnalyzerComponent, TransformComponent>();
        while (analyzerQuery.MoveNext(out var uid, out var component, out var transform))
        {
            //Update rate limited to 1 second
            if (component.NextUpdate > _timing.CurTime)
                continue;

            if (component.ScannedEntity is not {} patient)
                continue;

            component.NextUpdate = _timing.CurTime + component.UpdateInterval;

            //Get distance between health analyzer and the scanned entity
            var patientCoordinates = Transform(patient).Coordinates;
            if (!patientCoordinates.InRange(EntityManager, _transformSystem, transform.Coordinates, component.MaxScanRange))
            {
                //Range too far, disable updates
                StopAnalyzingEntity((uid, component), patient);
                continue;
            }

            UpdateScannedUser(uid, patient, true);
        }
    }

    /// <summary>
    /// Trigger the doafter for scanning
    /// </summary>
    private void OnAfterInteract(Entity<HealthAnalyzerComponent> uid, ref AfterInteractEvent args)
    {
        if (args.Target == null || !args.CanReach || !HasComp<MobStateComponent>(args.Target) || !_cell.HasDrawCharge(uid, user: args.User))
            return;

        _audio.PlayPvs(uid.Comp.ScanningBeginSound, uid);

        _doAfterSystem.TryStartDoAfter(new DoAfterArgs(EntityManager, args.User, uid.Comp.ScanDelay, new HealthAnalyzerDoAfterEvent(), uid, target: args.Target, used: uid)
        {
            NeedHand = true,
            BreakOnMove = true
        });
    }

    private void OnDoAfter(Entity<HealthAnalyzerComponent> uid, ref HealthAnalyzerDoAfterEvent args)
    {
        if (args.Handled || args.Cancelled || args.Target == null || !_cell.HasDrawCharge(uid, user: args.User))
            return;

        _audio.PlayPvs(uid.Comp.ScanningEndSound, uid);

        OpenUserInterface(args.User, uid);
        BeginAnalyzingEntity(uid, args.Target.Value);
        args.Handled = true;
    }

    /// <summary>
    /// Turn off when placed into a storage item or moved between slots/hands
    /// </summary>
    private void OnInsertedIntoContainer(Entity<HealthAnalyzerComponent> uid, ref EntGotInsertedIntoContainerMessage args)
    {
        if (uid.Comp.ScannedEntity is { } patient)
            StopAnalyzingEntity(uid, patient);
    }

    /// <summary>
    /// Disable continuous updates once battery is dead
    /// </summary>
    private void OnPowerCellSlotEmpty(Entity<HealthAnalyzerComponent> uid, ref PowerCellSlotEmptyEvent args)
    {
        if (uid.Comp.ScannedEntity is { } patient)
            StopAnalyzingEntity(uid, patient);
    }

    /// <summary>
    /// Turn off the analyser when dropped
    /// </summary>
    private void OnDropped(Entity<HealthAnalyzerComponent> uid, ref DroppedEvent args)
    {
        if (uid.Comp.ScannedEntity is { } patient)
            StopAnalyzingEntity(uid, patient);
    }

    private void OpenUserInterface(EntityUid user, EntityUid analyzer)
    {
        if (!TryComp<ActorComponent>(user, out var actor) || !_uiSystem.TryGetUi(analyzer, HealthAnalyzerUiKey.Key, out var ui))
            return;

        _uiSystem.OpenUi(ui, actor.PlayerSession);
    }

    /// <summary>
    /// Mark the entity as having its health analyzed, and link the analyzer to it
    /// </summary>
    /// <param name="healthAnalyzer">The health analyzer that should receive the updates</param>
    /// <param name="target">The entity to start analyzing</param>
    private void BeginAnalyzingEntity(Entity<HealthAnalyzerComponent> healthAnalyzer, EntityUid target)
    {
        //Link the health analyzer to the scanned entity
        healthAnalyzer.Comp.ScannedEntity = target;

        _cell.SetPowerCellDrawEnabled(healthAnalyzer, true);

        UpdateScannedUser(healthAnalyzer, target, true);
    }

    /// <summary>
    /// Remove the analyzer from the active list, and remove the component if it has no active analyzers
    /// </summary>
    /// <param name="healthAnalyzer">The health analyzer that's receiving the updates</param>
    /// <param name="target">The entity to analyze</param>
    private void StopAnalyzingEntity(Entity<HealthAnalyzerComponent> healthAnalyzer, EntityUid target)
    {
        //Unlink the analyzer
        healthAnalyzer.Comp.ScannedEntity = null;

        _cell.SetPowerCellDrawEnabled(target, false);

        UpdateScannedUser(healthAnalyzer, target, false);
    }

    /// <summary>
    /// Send an update for the target to the healthAnalyzer
    /// </summary>
    /// <param name="healthAnalyzer">The health analyzer</param>
    /// <param name="target">The entity being scanned</param>
    /// <param name="scanMode">True makes the UI show ACTIVE, False makes the UI show INACTIVE</param>
    public void UpdateScannedUser(EntityUid healthAnalyzer, EntityUid target, bool scanMode)
    {
        if (!_uiSystem.TryGetUi(healthAnalyzer, HealthAnalyzerUiKey.Key, out var ui))
            return;

        if (!HasComp<DamageableComponent>(target))
            return;

        var bodyTemperature = float.NaN;

        if (TryComp<TemperatureComponent>(target, out var temp))
            bodyTemperature = temp.CurrentTemperature;

        var bloodAmount = float.NaN;
        var bleeding = false;

        if (TryComp<BloodstreamComponent>(target, out var bloodstream) &&
            _solutionContainerSystem.ResolveSolution(target, bloodstream.BloodSolutionName,
                ref bloodstream.BloodSolution, out var bloodSolution))
        {
            bloodAmount = bloodSolution.FillFraction;
            bleeding = bloodstream.BleedAmount > 0;
        }



        _uiSystem.SendUiMessage(ui, new HealthAnalyzerScannedUserMessage(
            GetNetEntity(target),
            bodyTemperature,
            bloodAmount,
            scanMode,
            bleeding
        ));
    }
}