using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ln.objects.catalog;

namespace ln.types.odb.ng.diff
{
    public class DocumentDiff : Diff
    {
        Dictionary<ODBEntity, Diff> propertyDiffs = new Dictionary<ODBEntity, Diff>();

        public DocumentDiff(Document src, Document dst)
        {
            HashSet<ODBEntity> keys = new HashSet<ODBEntity>(src.Keys);
            foreach (ODBEntity key in dst.Keys)
                keys.Add(key);

            foreach (ODBEntity key in keys)
            {
                if (src[key].CompareTo(dst[key]) != 0)
                    propertyDiffs.Add(key, Diff.Construct(src[key], dst[key]));
            }
        }

        public override ODBEntity Apply(ODBEntity src)
        {
            Document srcDocument = src as Document;

            foreach (ODBValue key in propertyDiffs.Keys)
            {
                srcDocument[key] = propertyDiffs[key].Apply(srcDocument[key]);
            }

            return src;
        }

        public override string ToString()
        {
            return String.Format("[DocumentDiff ChangedProperties=({0})]",string.Join(",",propertyDiffs.Keys));
        }

        public override string ToTreeString(int indent)
        {
            indent += 2;
            StringBuilder stringBuilder = new StringBuilder();

            stringBuilder.AppendFormat("DocumentDiff ChangedProperties=({0})",string.Join(",",propertyDiffs.Keys));
            foreach (ODBEntity key in propertyDiffs.Keys)
            {
                stringBuilder.AppendLine();
                stringBuilder.AppendFormat("{0}{1,-32} {2}", new string(' ', indent), key, propertyDiffs[key].ToTreeString(indent));
            }

            return stringBuilder.ToString();

        }

    }
}