using System.Diagnostics.CodeAnalysis;
using Content.Shared._CP14.MagicEnergy;
using Content.Shared._CP14.MagicEnergy.Components;
using Content.Shared.Containers.ItemSlots;
using Content.Shared.Examine;
using Content.Shared.FixedPoint;
using Content.Shared.Popups;
using Robust.Shared.Containers;

namespace Content.Server._CP14.MagicEnergy;

public sealed class CP14MagicEnergyCrystalSlotSystem : SharedCP14MagicEnergyCrystalSlotSystem
{
    [Dependency] private readonly ItemSlotsSystem _itemSlots = default!;
    [Dependency] private readonly CP14MagicEnergySystem _magicEnergy = default!;
    [Dependency] private readonly SharedPopupSystem _popup = default!;
    [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
    [Dependency] private readonly SharedContainerSystem _container = default!;

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

        SubscribeLocalEvent<CP14MagicEnergyCrystalComponent, CP14MagicEnergyLevelChangeEvent>(OnEnergyChanged);

        SubscribeLocalEvent<CP14MagicEnergyCrystalSlotComponent, ExaminedEvent>(OnExamined);
        SubscribeLocalEvent<CP14MagicEnergyCrystalSlotComponent, CP14SlotCrystalChangedEvent>(OnCrystalChanged);
    }

    private void OnCrystalChanged(Entity<CP14MagicEnergyCrystalSlotComponent> ent, ref CP14SlotCrystalChangedEvent args)
    {
        var realPowered = TryGetEnergyCrystalFromSlot((ent, ent), out var energyComp);
        if (energyComp is not null)
            realPowered = energyComp.Value.Comp.Energy > 0;

        if (ent.Comp.Powered == realPowered)
            return;

        ent.Comp.Powered = realPowered;
        _appearance.SetData(ent, CP14MagicSlotVisuals.Powered, realPowered);

        RaiseLocalEvent(ent, new CP14SlotCrystalPowerChangedEvent(realPowered));
    }

    private void OnEnergyChanged(Entity<CP14MagicEnergyCrystalComponent> crystal, ref CP14MagicEnergyLevelChangeEvent args)
    {
        if (!_container.TryGetContainingContainer((crystal.Owner, null, null), out var container))
            return;

        if (!TryComp(container.Owner, out CP14MagicEnergyCrystalSlotComponent? slot))
            return;

        if (!_itemSlots.TryGetSlot(container.Owner, slot.SlotId, out var itemSlot))
            return;

        if (itemSlot.Item != crystal)
            return;

        RaiseLocalEvent(container.Owner, new CP14SlotCrystalChangedEvent(false));
    }

    private void OnExamined(Entity<CP14MagicEnergyCrystalSlotComponent> ent, ref ExaminedEvent args)
    {
        if (!TryGetEnergyCrystalFromSlot((ent, ent), out var energyEnt))
            return;

        if (!args.IsInDetailsRange)
            return;

        // TODO: scan energy ability
        // var scanEvent = new CP14MagicEnergyScanEvent();
        // RaiseLocalEvent(args.Examiner, scanEvent);
        //
        // if (!scanEvent.CanScan)
        //    return;

        args.PushMarkup(_magicEnergy.GetEnergyExaminedText((energyEnt.Value, energyEnt)));
    }

    public bool TryGetEnergyCrystalFromSlot(Entity<CP14MagicEnergyCrystalSlotComponent?> ent,
        [NotNullWhen(true)] out Entity<CP14MagicEnergyContainerComponent>? energyEnt)
    {
        energyEnt = null;

        if (!Resolve(ent, ref ent.Comp, false))
            return false;

        if (!_itemSlots.TryGetSlot(ent, ent.Comp.SlotId, out var slot))
            return false;

        if (slot.Item is null)
            return false;

        if (!TryComp<CP14MagicEnergyContainerComponent>(slot.Item, out var energyComp))
            return false;

        energyEnt = (slot.Item.Value, energyComp);
        return true;
    }

    public bool HasEnergy(Entity<CP14MagicEnergyCrystalSlotComponent?> ent,
        FixedPoint2 energy,
        EntityUid? user = null)
    {
        if (!TryGetEnergyCrystalFromSlot(ent, out var energyEnt))
        {
            if (user is not null)
                _popup.PopupEntity(Loc.GetString("cp14-magic-energy-no-crystal"), ent,user.Value);

            return false;
        }

        if (energyEnt.Value.Comp.Energy >= energy)
            return true;

        if (user is not null)
            _popup.PopupEntity(Loc.GetString("cp14-magic-energy-insufficient"), ent, user.Value);

        return false;
    }

    public bool TryChangeEnergy(Entity<CP14MagicEnergyCrystalSlotComponent?> ent,
        FixedPoint2 energy,
        EntityUid? user = null,
        bool safe = false)
    {
        if (!TryGetEnergyCrystalFromSlot(ent, out var energyEnt))
        {
            if (user is not null)
                _popup.PopupEntity(Loc.GetString("cp14-magic-energy-no-crystal"), ent, user.Value);

            return false;
        }

        _magicEnergy.ChangeEnergy((energyEnt.Value, energyEnt.Value), energy, out _, out _, safe);
        return true;
    }
}