@using Sandbox;
@using Sandbox.UI;
@inherits PanelComponent
@implements ILocalPlayerEvent

<root>
    @for ( int i=0; i<5; i++ )
    {
        <InventorySlot Index=@i Inventory=@inventory Hovered=@hovered Active=@active></InventorySlot>
    }
</root>

@code
{
    [Property] public SoundEvent SwitchSound { get; set; }
    [Property] public SoundEvent SelectSound { get; set; }
    [Property] public SoundEvent CancelSound { get; set; }

    PlayerInventory inventory;
    BaseWeapon hovered;
    BaseWeapon active;

    protected override int BuildHash() => HashCode.Combine(inventory, hovered, active);

    void ILocalPlayerEvent.OnWeaponAdded(BaseWeapon weapon)
    {
        StateHasChanged();
    }
     
    protected override void OnUpdate()
    {
        inventory = Game.ActiveScene.GetAllComponents<PlayerInventory>().Where(x => x.Network.IsOwner).FirstOrDefault();

        Panel.SetClass("hidden", hovered is null);

        DoInventoryInput();
    }

    RealTimeSince timeSinceInteraction;

    void DoInventoryInput()
    {
        if ( inventory is null ) 
            return;

        MoveSlot( (int)Input.MouseWheel.y );

        if ( Input.Down( "SlotNext" ) ) MoveSlot( 1 );
        if ( Input.Pressed( "SlotPrev" ) ) MoveSlot( -1 );

        if ( Input.Pressed( "Slot1" ) ) IterateSlot( 0 );
        if ( Input.Pressed( "Slot2" ) ) IterateSlot( 1 );
        if ( Input.Pressed( "Slot3" ) ) IterateSlot( 2 );
        if ( Input.Pressed( "Slot4" ) ) IterateSlot( 3 );
        if ( Input.Pressed( "Slot5" ) ) IterateSlot( 4 );

        if ( hovered is null )
            return;

        if ( Input.Pressed( "Attack1" ) )
        {
            Input.ReleaseAction("Attack1");
            inventory.SwitchWeapon(hovered);
            active = hovered;
            hovered = null;
            Sound.Play( SelectSound );
        }

        if (Input.Pressed("Attack2") || timeSinceInteraction > 2)
        {
            Input.ReleaseAction("Attack2");
            hovered = null;
            active = null;
            Sound.Play( CancelSound );
        }
    }

    public void MoveSlot( int delta )
    {
        if ( delta == 0 )
            return;

        if (inventory.Weapons.Count == 0)
            return;

        var currentHover = hovered ?? active ?? inventory.Weapons.FirstOrDefault();

        int currentSlot = inventory.Weapons.IndexOf(currentHover);

        currentSlot += delta;
        currentSlot %= inventory.Weapons.Count;
        if ( currentSlot < 0 )
            currentSlot = inventory.Weapons.Count + currentSlot;

        active = null;
        hovered = inventory.Weapons[currentSlot];
        timeSinceInteraction = 0;

        Sound.Play( SwitchSound );
    }

    public void IterateSlot(int slot)
    {
        var slotWeapons = inventory.Weapons.Where(x => x.InventorySlot == slot).OrderBy( x => x.InventoryOrder ).ToList();
        if (slotWeapons.Count == 0)
            return;

        var currentHover = hovered ?? active ?? slotWeapons.FirstOrDefault();

        int currentSlot = slotWeapons.IndexOf(currentHover);

        currentSlot += 1;
        currentSlot %= slotWeapons.Count;
        if ( currentSlot < 0 )
            currentSlot = slotWeapons.Count + currentSlot;

        active = null;
        hovered = slotWeapons[currentSlot];
        timeSinceInteraction = 0;

        Sound.Play( SwitchSound );
    }
}