using PaintDotNet.Measurement.HistoryMementos;
using System;

namespace PaintDotNet.Measurement.HistoryFunctions
{
    public sealed class DeleteLayerFunction
        : HistoryFunction
    {
        public static string StaticName
        {
            get
            {
                return PdnResources.GetString("DeleteLayer.HistoryMementoName");
            }
        }

        public static ImageResource StaticImage
        {
            get
            {
                return PdnResources.GetImageResource("Icons.MenuLayersDeleteLayerIcon.png");
            }
        }

        private int layerIndex;

        public override HistoryMemento OnExecute(IDocumentWorkspace historyWorkspace)
        {
            if (this.layerIndex < 0 || this.layerIndex >= historyWorkspace.GetDocument().Layers.Count)
            {
                throw new ArgumentOutOfRangeException("layerIndex = " + this.layerIndex +
                    ", expected [0, " + historyWorkspace.GetDocument().Layers.Count + ")");
            }

            HistoryMemento hm = new DeleteLayerHistoryMemento(StaticName, StaticImage, historyWorkspace, historyWorkspace.GetDocument().Layers.GetAt(this.layerIndex));

            EnterCriticalRegion();
            historyWorkspace.GetDocument().Layers.RemoveAt(this.layerIndex);

            return hm;
        }

        public DeleteLayerFunction(int layerIndex)
            : base(PaintDotNet.Measurement.Enum.ActionFlags.None)
        {
            this.layerIndex = layerIndex;
        }
    }
}