using Content.Server.Atmos.Piping.Components;
using Content.Server.Atmos.Piping.Trinary.Components;
using Content.Server.NodeContainer.EntitySystems;
using Content.Server.NodeContainer.Nodes;
using Content.Shared.Atmos.Piping;
using Content.Shared.Audio;
using JetBrains.Annotations;

namespace Content.Server.Atmos.Piping.Trinary.EntitySystems
{
    [UsedImplicitly]
    public sealed class PressureControlledValveSystem : EntitySystem
    {
        [Dependency] private readonly SharedAmbientSoundSystem _ambientSoundSystem = default!;
        [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
        [Dependency] private readonly NodeContainerSystem _nodeContainer = default!;

        public override void Initialize()
        {
            base.Initialize();
            SubscribeLocalEvent<PressureControlledValveComponent, ComponentInit>(OnInit);
            SubscribeLocalEvent<PressureControlledValveComponent, AtmosDeviceUpdateEvent>(OnUpdate);
            SubscribeLocalEvent<PressureControlledValveComponent, AtmosDeviceDisabledEvent>(OnFilterLeaveAtmosphere);
        }

        private void OnInit(EntityUid uid, PressureControlledValveComponent comp, ComponentInit args)
        {
            UpdateAppearance(uid, comp);
        }

        private void OnUpdate(EntityUid uid, PressureControlledValveComponent comp, ref AtmosDeviceUpdateEvent args)
        {
            if (!_nodeContainer.TryGetNodes(uid, comp.InletName, comp.ControlName, comp.OutletName, out PipeNode? inletNode, out PipeNode? controlNode, out PipeNode? outletNode))
            {
                _ambientSoundSystem.SetAmbience(uid, false);
                comp.Enabled = false;
                return;
            }

            // If the pressure in either inlet or outlet exceeds the side pressure, act as an open pipe.
            if (!comp.Enabled && (controlNode.Air.Pressure < inletNode.Air.Pressure
                || controlNode.Air.Pressure < outletNode.Air.Pressure))
            {
                inletNode.AddAlwaysReachable(outletNode);
                outletNode.AddAlwaysReachable(inletNode);
                comp.Enabled = true;
                UpdateAppearance(uid, comp);
                _ambientSoundSystem.SetAmbience(uid, true);
                return;
            }

            if (!comp.Enabled)
                return;

            inletNode.RemoveAlwaysReachable(outletNode);
            outletNode.RemoveAlwaysReachable(inletNode);
            comp.Enabled = false;
            UpdateAppearance(uid, comp);
            _ambientSoundSystem.SetAmbience(uid, false);
        }

        private void OnFilterLeaveAtmosphere(EntityUid uid, PressureControlledValveComponent comp, ref AtmosDeviceDisabledEvent args)
        {
            comp.Enabled = false;
            UpdateAppearance(uid, comp);
            _ambientSoundSystem.SetAmbience(uid, false);
        }

        private void UpdateAppearance(EntityUid uid, PressureControlledValveComponent? comp = null, AppearanceComponent? appearance = null)
        {
            if (!Resolve(uid, ref comp, ref appearance, false))
                return;

            _appearance.SetData(uid, FilterVisuals.Enabled, comp.Enabled, appearance);
        }
    }
}