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

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

        public string Name
        {
            get
            {
                return LeftItem != null ? LeftItem.IndexName : (RightItem != null ? RightItem.IndexName : string.Empty);
            }
        }

        public static List<IndexComparison> Compare(List<Index> indexes1, List<Index> indexes2)
        {
            List<IndexComparison> comparison = new List<IndexComparison>();
            foreach (Index index in indexes1)
            {
                Index result = indexes2.Find(
                    delegate(Index i)
                    {
                        return i.TableName == index.TableName;
                    }
                );
                if (result != null)
                {
                    if (index != result)
                    {
                        comparison.Add(new IndexComparison(index, result, ComparisonDifference.Different));
                    }
                    else
                    {
                        comparison.Add(new IndexComparison(index, result, ComparisonDifference.None));
                    }
                }
                else
                {
                    comparison.Add(new IndexComparison(index, null, ComparisonDifference.LeftOnly));
                }
            }
            foreach (Index index in indexes2)
            {
                Index result = indexes1.Find(
                    delegate(Index i)
                    {
                        return i.IndexName == index.IndexName;
                    }
                );
                if (result == null)
                {
                    comparison.Add(new IndexComparison(null, index, ComparisonDifference.RightOnly));
                }
            }
            return comparison;
        }
    }
}