using System;
using System.Collections.Generic;
using System.Text;
using System.Data;

using Menees.DiffUtils;

namespace sharpcomparer
{
    public class RowComparison : Comparison<DataRow>
    {
        public RowComparison(DataRow leftItem, DataRow rightItem, ComparisonDifference difference)
            : base(leftItem, rightItem, difference)
        {
        }

        public static List<RowComparison> Compare(DataTable left, DataTable right)
        {
            int i = 0;

            //columns1.Sort(delegate(Column p1, Column p2)
            //{
            //    return p1.OrdinalPosition.CompareTo(p2.OrdinalPosition);
            //});
            //columns2.Sort(delegate(Column p1, Column p2)
            //{
            //    return p1.OrdinalPosition.CompareTo(p2.OrdinalPosition);
            //});

            List<RowComparison> r1 = new List<RowComparison>();
            List<RowComparison> r2 = new List<RowComparison>();
            foreach (DataRow r in left.Rows)
            {
                r1.Add(new RowComparison(r, null, Comparison<DataRow>.ComparisonDifference.None));
            }
            foreach (DataRow r in right.Rows)
            {
                r2.Add(new RowComparison(null, r, Comparison<DataRow>.ComparisonDifference.None));
            }



            int offset1 = 0;

            //MyersDiff<Column> comparer = new MyersDiff<DataRow>(left.Rows.ToArray(), columns2.ToArray(), true);
            //EditScript script = comparer.Execute();
            //List<ColumnComparison> ColumnsA;
            //List<ColumnComparison> ColumnsB;

            //if (script.Count > 0)
            //{
            //    foreach (Edit edit in script)
            //    {
            //        switch (edit.Type)
            //        {
            //            case EditType.Insert:

            //                ColumnsB = r2.GetRange(edit.StartB, edit.Length);
            //                ColumnsA = new List<ColumnComparison>();
            //                foreach (ColumnComparison b in ColumnsB)
            //                {
            //                    ColumnComparison a = new ColumnComparison(null, b.RightItem, Comparison<Column>.ComparisonDifference.RightOnly);
            //                    ColumnsA.Add(a);
            //                }
            //                r1.InsertRange(edit.StartA + offset1, ColumnsA);
            //                offset1 += edit.Length;

            //                break;

            //            case EditType.Change:

            //                for (i = 0; i < edit.Length; i++)
            //                {
            //                    r1[edit.StartA + offset1 + i].Difference = Comparison<Column>.ComparisonDifference.Different;
            //                    r2[edit.StartA + offset1 + i].Difference = Comparison<Column>.ComparisonDifference.Different;
            //                }

            //                break;

            //            case EditType.Delete:

            //                ColumnsA = r1.GetRange(edit.StartA + offset1, edit.Length);
            //                ColumnsB = new List<ColumnComparison>();
            //                foreach (ColumnComparison a in ColumnsA)
            //                {
            //                    ColumnComparison b = new ColumnComparison(a.LeftItem, null, Comparison<Column>.ComparisonDifference.LeftOnly);
            //                    ColumnsB.Add(b);
            //                    a.Difference = Comparison<Column>.ComparisonDifference.LeftOnly;
            //                }
            //                r2.InsertRange(edit.StartB, ColumnsB);

            //                break;

            //            case EditType.None:

            //                // NOOP

            //                break;
            //        }
            //    }
            //}

            //for (i = 0; i < r1.Count; i++)
            //{
            //    ColumnComparison cc1 = r1[i];
            //    ColumnComparison cc2 = r2[i];

            //    if (cc1.Difference == Comparison<Column>.ComparisonDifference.None || cc1.Difference == Comparison<Column>.ComparisonDifference.Different)
            //    {
            //        cc1.RightItem = cc2.RightItem;
            //    }
            //}

            return r1;
        }
    }
}