using System;
using PDFPatcher.Common;
using A = PDFPatcher.Constants.ActionType;
using D = PDFPatcher.Constants.DestinationAttributes;

namespace PDFPatcher.Processor
{
	sealed class ForceInternalLinkProcessor : IPdfInfoXmlProcessor
	{
		#region IInfoDocProcessor 成员

		public string Name => "设置点击目标到页首";

		public IUndoAction Process(System.Xml.XmlElement item) {
			if (item.HasAttribute(D.Action)
				&& item.GetAttribute(D.Path).EndsWith(".pdf", StringComparison.InvariantCultureIgnoreCase)
				&& ValueHelper.IsInCollection(item.GetAttribute(D.Action), A.GotoR, A.Launch, A.Uri)) {
				var undo = new UndoActionGroup();
				undo.Add(UndoAttributeAction.GetUndoAction(item, D.Action, A.Goto));
				if (item.HasAttribute(D.Page) == false
					&& item.HasAttribute(D.Named) == false
					&& item.HasAttribute(D.NamedN) == false
					) {
					undo.Add(UndoAttributeAction.GetUndoAction(item, D.Page, "1"));
				}
				return undo;
			}
			return null;
		}

		#endregion
	}
}