using Content.Server.Atmos.EntitySystems;
using Content.Server.Atmos.Piping.Components;
using Content.Server.Atmos.Piping.Unary.Components;
using Content.Server.NodeContainer;
using Content.Server.NodeContainer.Nodes;
using Content.Shared.Atmos.Piping;
using JetBrains.Annotations;
using Robust.Shared.GameObjects;
using Robust.Shared.IoC;

namespace Content.Server.Atmos.Piping.Unary.EntitySystems
{
    [UsedImplicitly]
    public class GasThermoMachineSystem : EntitySystem
    {
        [Dependency] private readonly AtmosphereSystem _atmosphereSystem = default!;

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

            SubscribeLocalEvent<GasThermoMachineComponent, AtmosDeviceUpdateEvent>(OnThermoMachineUpdated);
            SubscribeLocalEvent<GasThermoMachineComponent, AtmosDeviceDisabledEvent>(OnThermoMachineLeaveAtmosphere);
        }

        private void OnThermoMachineUpdated(EntityUid uid, GasThermoMachineComponent thermoMachine, AtmosDeviceUpdateEvent args)
        {
            var appearance = EntityManager.GetComponentOrNull<AppearanceComponent>(thermoMachine.Owner);

            if (!thermoMachine.Enabled
                || !EntityManager.TryGetComponent(uid, out NodeContainerComponent? nodeContainer)
                || !nodeContainer.TryGetNode(thermoMachine.InletName, out PipeNode? inlet))
            {
                appearance?.SetData(ThermoMachineVisuals.Enabled, false);
                return;
            }

            var airHeatCapacity = _atmosphereSystem.GetHeatCapacity(inlet.Air);
            var combinedHeatCapacity = airHeatCapacity + thermoMachine.HeatCapacity;
            var oldTemperature = inlet.Air.Temperature;

            if (combinedHeatCapacity > 0)
            {
                appearance?.SetData(ThermoMachineVisuals.Enabled, true);
                var combinedEnergy = thermoMachine.HeatCapacity * thermoMachine.TargetTemperature + airHeatCapacity * inlet.Air.Temperature;
                inlet.Air.Temperature = combinedEnergy / combinedHeatCapacity;
            }

            // TODO ATMOS: Active power usage.
        }

        private void OnThermoMachineLeaveAtmosphere(EntityUid uid, GasThermoMachineComponent component, AtmosDeviceDisabledEvent args)
        {
            if (EntityManager.TryGetComponent(uid, out AppearanceComponent? appearance))
            {
                appearance.SetData(ThermoMachineVisuals.Enabled, false);
            }
        }
    }
}