using System;
using System.Windows.Forms;
using PDFPatcher.Common;

namespace PDFPatcher
{
	sealed class ListViewItemComparer : System.Collections.IComparer
	{
		///<summary>获取或指定排序列的值。</summary>
		public int Col { get; }
		///<summary>获取或指定是否使用智能排序。</summary>
		public bool UseSmartSort { get; }
		///<summary>获取或指定列表排序的方式。</summary>
		public SortOrder SortOrder { get; }

		public ListViewItemComparer() {
			Col = 0;
		}
		public ListViewItemComparer(int column) {
			Col = column;
		}
		public ListViewItemComparer(int column, bool useSmartSort) {
			Col = column;
			UseSmartSort = useSmartSort;
			SortOrder = SortOrder.Ascending;
		}
		public ListViewItemComparer(int column, bool useSmartSort, SortOrder sortOrder) {
			Col = column;
			UseSmartSort = useSmartSort;
			SortOrder = sortOrder;
		}

		#region IComparer 成员

		int System.Collections.IComparer.Compare(object x, object y) {
			if (SortOrder == SortOrder.None) {
				return 0;
			}
			var a = ((ListViewItem)x).SubItems[Col].Text;
			var b = ((ListViewItem)y).SubItems[Col].Text;
			int r = UseSmartSort ? FileHelper.NumericAwareComparePath(a, b) : String.Compare(a, b);
			return (SortOrder == SortOrder.Ascending) ? r : -r;
		}

		#endregion

	}

	sealed class OlvColumnSmartComparer(BrightIdeasSoftware.OLVColumn column, SortOrder sortOrder) : System.Collections.IComparer
	{
		///<summary>获取排序列。</summary>
		public BrightIdeasSoftware.OLVColumn Column { get; } = column;
		///<summary>获取列表排序的方式。</summary>
		public SortOrder SortOrder { get; } = sortOrder;

		#region IComparer 成员

		int System.Collections.IComparer.Compare(object x, object y) {
			if (SortOrder == SortOrder.None) {
				return 0;
			}
			var a = Column.GetStringValue(x);
			var b = Column.GetStringValue(y);
			int r = FileHelper.NumericAwareComparePath(a, b);
			return (SortOrder == SortOrder.Ascending) ? r : -r;
		}

		#endregion
	}
}