using System.Linq;
using Content.Server.Atmos.EntitySystems;
using Content.Server.Body.Systems;
using Content.Server.Mech.Components;
using Content.Shared.Atmos;
using Content.Shared.Damage.Systems;
using Content.Shared.DoAfter;
using Content.Shared.FixedPoint;
using Content.Shared.Interaction;
using Content.Shared.Mech;
using Content.Shared.Mech.Components;
using Content.Shared.Mech.EntitySystems;
using Content.Shared.Power.Components;
using Content.Shared.Power.EntitySystems;
using Content.Shared.Tools;
using Content.Shared.Tools.Components;
using Content.Shared.Tools.Systems;
using Content.Shared.Vehicle;
using Content.Shared.Vehicle.Components;
using Content.Shared.Wires;
using Robust.Server.Containers;
using Robust.Server.GameObjects;
using Robust.Shared.Containers;
using Robust.Shared.Prototypes;

namespace Content.Server.Mech.Systems;

/// <inheritdoc/>
public sealed partial class MechSystem : SharedMechSystem
{
    [Dependency] private AtmosphereSystem _atmosphere = default!;
    [Dependency] private SharedBatterySystem _battery = default!;
    [Dependency] private ContainerSystem _container = default!;
    [Dependency] private DamageableSystem _damageable = default!;
    [Dependency] private SharedDoAfterSystem _doAfter = default!;
    [Dependency] private UserInterfaceSystem _ui = default!;
    [Dependency] private SharedToolSystem _toolSystem = default!;

    private static readonly ProtoId<ToolQualityPrototype> PryingQuality = "Prying";

    [SubscribeLocalEvent]
    private void OnMechCanMoveEvent(Entity<MechComponent> ent, ref VehicleCanRunEvent args)
    {
        if (ent.Comp.Broken || ent.Comp.Integrity <= 0 || ent.Comp.Energy <= 0)
            args.CanRun = false;
    }

    [SubscribeLocalEvent]
    private void OnInteractUsing(EntityUid uid, MechComponent component, InteractUsingEvent args)
    {
        if (TryComp<WiresPanelComponent>(uid, out var panel) && !panel.Open)
            return;

        if (component.BatterySlot.ContainedEntity == null && TryComp<BatteryComponent>(args.Used, out var battery))
        {
            InsertBattery(uid, args.Used, component, battery);
            return;
        }

        if (_toolSystem.HasQuality(args.Used, PryingQuality) && component.BatterySlot.ContainedEntity != null)
        {
            var doAfterEventArgs = new DoAfterArgs(EntityManager, args.User, component.BatteryRemovalDelay,
                new RemoveBatteryEvent(), uid, target: uid, used: args.Used)
            {
                BreakOnMove = true
            };

            _doAfter.TryStartDoAfter(doAfterEventArgs);
        }
    }

    [SubscribeLocalEvent]
    private void OnInsertBattery(EntityUid uid, MechComponent component, EntInsertedIntoContainerMessage args)
    {
        if (args.Container != component.BatterySlot || !TryComp<BatteryComponent>(args.Entity, out var battery))
            return;

        component.Energy = _battery.GetCharge((args.Entity, battery));
        component.MaxEnergy = battery.MaxCharge;

        Dirty(uid, component);
        Vehicle.RefreshCanRun(uid);
    }

    [SubscribeLocalEvent]
    private void OnRemoveBattery(EntityUid uid, MechComponent component, RemoveBatteryEvent args)
    {
        if (args.Cancelled || args.Handled)
            return;

        RemoveBattery(uid, component);

        args.Handled = true;
    }

    [SubscribeLocalEvent]
    private void OnMapInit(EntityUid uid, MechComponent component, MapInitEvent args)
    {
        var xform = Transform(uid);
        // TODO: this should use containerfill?
        foreach (var equipment in component.StartingEquipment)
        {
            var ent = Spawn(equipment, xform.Coordinates);
            InsertEquipment(uid, ent, component);
        }

        // TODO: this should just be damage and battery
        component.Integrity = component.MaxIntegrity;
        component.Energy = component.MaxEnergy;

        Vehicle.RefreshCanRun(uid);
        Dirty(uid, component);
    }

    [SubscribeLocalEvent]
    private void OnRemoveEquipmentMessage(EntityUid uid, MechComponent component, MechEquipmentRemoveMessage args)
    {
        var equip = GetEntity(args.Equipment);

        if (!Exists(equip) || Deleted(equip))
            return;

        if (!component.EquipmentContainer.ContainedEntities.Contains(equip))
            return;

        RemoveEquipment(uid, equip, component);
    }

    [SubscribeLocalEvent]
    private void OnToolUseAttempt(Entity<VehicleOperatorComponent> ent, ref ToolUserAttemptUseEvent args)
    {
        if (ent.Comp.Vehicle is { } vehicle && args.Target == vehicle)
            args.Cancelled = true;
    }

    [SubscribeLocalEvent]
    private void OnDamageChanged(EntityUid uid, MechComponent component, DamageChangedEvent args)
    {
        var integrity = component.MaxIntegrity - _damageable.GetTotalDamage((uid, args.Damageable));
        SetIntegrity(uid, integrity, component);
    }

    [SubscribeLocalEvent]
    private void RelayGrabberUiMessage(EntityUid uid, MechComponent component, ref MechGrabberEjectMessage args)
    {
        ReceiveEquipmentUiMesssages(component, args);
    }

    [SubscribeLocalEvent]
    private void RelaySoundboardUiMessage(EntityUid uid, MechComponent component, ref MechSoundboardPlayMessage args)
    {
        ReceiveEquipmentUiMesssages(component, args);
    }

    private void ReceiveEquipmentUiMesssages<T>(MechComponent component, T args) where T : MechEquipmentUiMessage
    {
        var ev = new MechEquipmentUiMessageRelayEvent(args);
        var allEquipment = new List<EntityUid>(component.EquipmentContainer.ContainedEntities);
        var argEquip = GetEntity(args.Equipment);

        foreach (var equipment in allEquipment)
        {
            if (argEquip == equipment)
                RaiseLocalEvent(equipment, ev);
        }
    }

    public override void UpdateUserInterface(EntityUid uid, MechComponent? component = null)
    {
        if (!Resolve(uid, ref component))
            return;

        base.UpdateUserInterface(uid, component);

        var ev = new MechEquipmentUiStateReadyEvent();
        foreach (var ent in component.EquipmentContainer.ContainedEntities)
        {
            RaiseLocalEvent(ent, ev);
        }

        var state = new MechBoundUiState
        {
            EquipmentStates = ev.States
        };
        _ui.SetUiState(uid, MechUiKey.Key, state);
    }

    public override void BreakMech(EntityUid uid, MechComponent? component = null)
    {
        base.BreakMech(uid, component);

        _ui.CloseUi(uid, MechUiKey.Key);
        Vehicle.RefreshCanRun(uid);
    }

    public override bool TryChangeEnergy(EntityUid uid, FixedPoint2 delta, MechComponent? component = null)
    {
        if (!Resolve(uid, ref component))
            return false;

        if (!base.TryChangeEnergy(uid, delta, component))
            return false;

        var battery = component.BatterySlot.ContainedEntity;
        if (battery == null)
            return false;

        if (!TryComp<BatteryComponent>(battery, out var batteryComp))
            return false;

        _battery.SetCharge((battery.Value, batteryComp), _battery.GetCharge((battery.Value, batteryComp)) + delta.Float());
        // TODO: Power cells are predicted now, so no need to duplicate the charge level
        var charge = _battery.GetCharge((battery.Value, batteryComp));
        if (charge != component.Energy) //if there's a discrepency, we have to resync them
        {
            Log.Debug($"Battery charge was not equal to mech charge. Battery {charge}. Mech {component.Energy}");
            component.Energy = charge;
            Dirty(uid, component);
        }
        Vehicle.RefreshCanRun(uid);
        return true;
    }

    public void InsertBattery(EntityUid uid, EntityUid toInsert, MechComponent? component = null, BatteryComponent? battery = null)
    {
        if (!Resolve(uid, ref component, false))
            return;

        if (!Resolve(toInsert, ref battery, false))
            return;

        _container.Insert(toInsert, component.BatterySlot);
        component.Energy = _battery.GetCharge((toInsert, battery));
        component.MaxEnergy = battery.MaxCharge;

        Vehicle.RefreshCanRun(uid);

        Dirty(uid, component);
        UpdateUserInterface(uid, component);
    }

    public void RemoveBattery(EntityUid uid, MechComponent? component = null)
    {
        if (!Resolve(uid, ref component))
            return;

        _container.EmptyContainer(component.BatterySlot);
        component.Energy = 0;
        component.MaxEnergy = 0;

        Vehicle.RefreshCanRun(uid);

        Dirty(uid, component);
        UpdateUserInterface(uid, component);
    }

    #region Atmos Handling
    [SubscribeLocalEvent]
    private void OnInhale(Entity<VehicleOperatorComponent> ent, ref InhaleLocationEvent args)
    {
        if (ent.Comp.Vehicle is not { } vehicle ||
            !TryComp<MechComponent>(vehicle, out var mech) ||
            !TryComp<MechAirComponent>(vehicle, out var mechAir))
        {
            return;
        }

        if (mech.Airtight)
            args.Gas = mechAir.Air;
    }

    [SubscribeLocalEvent]
    private void OnExhale(Entity<VehicleOperatorComponent> ent, ref ExhaleLocationEvent args)
    {
        if (ent.Comp.Vehicle is not { } vehicle ||
            !TryComp<MechComponent>(vehicle, out var mech) ||
            !TryComp<MechAirComponent>(vehicle, out var mechAir))
        {
            return;
        }

        if (mech.Airtight)
            args.Gas = mechAir.Air;
    }

    [SubscribeLocalEvent]
    private void OnExpose(Entity<VehicleOperatorComponent> ent, ref AtmosExposedGetAirEvent args)
    {
        if (args.Handled || ent.Comp.Vehicle is not { } vehicle)
            return;

        if (!TryComp(vehicle, out MechComponent? mech))
            return;

        if (mech.Airtight && TryComp(vehicle, out MechAirComponent? air))
        {
            args.Handled = true;
            args.Gas = air.Air;
            return;
        }

        args.Gas = _atmosphere.GetContainingMixture(vehicle, excite: args.Excite);
        args.Handled = true;
    }

    [SubscribeLocalEvent]
    private void OnGetFilterAir(EntityUid uid, MechAirComponent comp, ref GetFilterAirEvent args)
    {
        if (args.Air != null)
            return;

        // only airtight mechs get internal air
        if (!TryComp<MechComponent>(uid, out var mech) || !mech.Airtight)
            return;

        args.Air = comp.Air;
    }
    #endregion
}