using System;
using System.Collections.Generic;

namespace Kreta.Job.Tasks.Helpers.Iktatas
{
    public class WordIktatoszamVonalkodTextReplacer : Aspose.Words.Replacing.IReplacingCallback
    {
        public List<Aspose.Words.Run> nodes = new List<Aspose.Words.Run>();

        Aspose.Words.Replacing.ReplaceAction Aspose.Words.Replacing.IReplacingCallback.Replacing(Aspose.Words.Replacing.ReplacingArgs e)
        {
            // This is a Run node that contains either the beginning or the complete match.
            Aspose.Words.Node currentNode = e.MatchNode;

            // The first (and may be the only) run can contain text before the match, 
            // in this case it is necessary to split the run.
            if (e.MatchOffset > 0)
                currentNode = SplitRun((Aspose.Words.Run)currentNode, e.MatchOffset);

            System.Collections.ArrayList runs = new System.Collections.ArrayList();

            // Find all runs that contain parts of the match string.
            int remainingLength = e.Match.Value.Length;
            while (

            (remainingLength > 0) &&

            (currentNode != null) &&

            (currentNode.GetText().Length <= remainingLength))
            {

                runs.Add(currentNode);

                remainingLength -= currentNode.GetText().Length;

                // Select the next Run node. 
                // Have to loop because there could be other nodes such as BookmarkStart etc.
                do
                {
                    currentNode = currentNode.NextSibling;
                }
                while ((currentNode != null) && (currentNode.NodeType != Aspose.Words.NodeType.Run));
            }

            // Split the last run that contains the match if there is any text left.
            if ((currentNode != null) && (remainingLength > 0))
            {
                SplitRun((Aspose.Words.Run)currentNode, remainingLength);
                runs.Add(currentNode);
            }

            String runText = "";
            foreach (Aspose.Words.Run run in runs)
                runText += run.Text;

            ((Aspose.Words.Run)runs[0]).Text = runText;

            for (int i = 1; i < runs.Count; i++)
            {
                ((Aspose.Words.Run)runs[i]).Remove();
            }

            ((Aspose.Words.Run)runs[0]).Font.Color = System.Drawing.Color.Black;
            if (e.Match.Value == "{vonalkod}")
            {
                ((Aspose.Words.Run)runs[0]).Font.Name = "Code 128";
            }

            nodes.Add((Aspose.Words.Run)runs[0]);

            return Aspose.Words.Replacing.ReplaceAction.Replace;
        }

        private static Aspose.Words.Run SplitRun(Aspose.Words.Run run, int position)
        {
            Aspose.Words.Run afterRun = (Aspose.Words.Run)run.Clone(true);
            afterRun.Text = run.Text.Substring(position);
            run.Text = run.Text.Substring(0, position);
            run.ParentNode.InsertAfter(afterRun, run);
            return afterRun;
        }
    }
}