using System;
using System.Collections.Generic;
using System.IO;

namespace uc
{
    public static class StringExtention
    {
        static public int[] ConvertToPageRange(this string str)
        {
            HashSet<int> col = new HashSet<int>();
            string[] ranges = str.Split(',');
            foreach(var s in ranges)
            {
                int page;
                if(int.TryParse(s, out page))
                {
                    col.Add(page);
                }
                else
                {
                    string[] pages = s.Split('-');
                    int start, end;
                    if(pages.Length == 2 && int.TryParse(pages[0], out start) && int.TryParse(pages[1], out end))
                    {
                        for(int i = start; i<= end; i++)
                        {
                            col.Add(i);
                        }
                    }
                }
            }
            int[] result = new int[col.Count];
            col.CopyTo(result);
            return result;
        }

        static public string GetRelativePath(this string targetPath, string refPath)
        {
            refPath = Path.GetFullPath(refPath + "/foo").Replace(@"\", @"/");
            Uri baseUri = new Uri(refPath);
            //Debug.Log("Base Path: " + baseUri);

            targetPath = Path.GetFullPath(targetPath).Replace(@"\", @"/");
            Uri targetUri = new Uri(targetPath );
            //Debug.Log("Target Path: " + targetUri);

            Uri relUri = baseUri.MakeRelativeUri(targetUri);

            return relUri.ToString().Replace(@"/", @"\");
        }
    }
}