using ImGuiNET;
using T3.Core.Operator;
using T3.Core.Operator.Slots;
using T3.Editor.Gui.Interaction.TransformGizmos;
using T3.Editor.UiModel;
using Vector2 = System.Numerics.Vector2;

namespace T3.Editor.Gui.OutputUi;

internal abstract class OutputUi<T> : IOutputUi
{
    public Symbol.OutputDefinition OutputDefinition { get; set; }
    public Guid Id => OutputDefinition.Id;
    public Type Type { get; } = typeof(T);
    public Vector2 PosOnCanvas { get; set; } = Vector2.Zero;
    public Vector2 Size { get; set; } = SymbolUi.Child.DefaultOpSize;

    public abstract IOutputUi Clone();

    public void DrawValue(ISlot slot, EvaluationContext context, string viewId, bool recompute)
    {
        var drawList = ImGui.GetWindowDrawList();
        drawList.ChannelsSplit(2);
        drawList.ChannelsSetCurrent(1);
        {
            TransformGizmoHandling.SetDrawList(drawList);
            if (recompute)
            {
                Recompute(slot, context);
            }
        }
        
        drawList.ChannelsSetCurrent(0);
        {
            DrawTypedValue(slot, viewId);
        }
        drawList.ChannelsMerge();
        TransformGizmoHandling.RestoreDrawList();
    }

    protected virtual void Recompute(ISlot slot, EvaluationContext context)
    {
        StartInvalidation(slot);
        slot.Update(context);
    }

    protected abstract void DrawTypedValue(ISlot slot, string viewId);

    protected void StartInvalidation(ISlot slot)
    {
        DirtyFlag.GlobalInvalidationTick++;
        slot.InvalidateGraph();
    }
}