using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace RainmeterStudio.Core.Utils
{
    public static class PathHelper
    {
        /// <summary>
        /// Validates a path
        /// </summary>
        /// <param name="path">The path</param>
        /// <returns>True if the path is valid</returns>
        public static bool IsPathValid(string path)
        {
            // Check for invalid characters
            if (Path.GetInvalidPathChars().Intersect(path).Any())
                return false;

            return true;
        }

        /// <summary>
        /// Validates a file name
        /// </summary>
        /// <param name="name">Name of file</param>
        /// <returns></returns>
        public static bool IsFileNameValid(string name)
        {
            // No name is not a valid name
            if (String.IsNullOrEmpty(name))
                return false;

            // Check for invalid characters
            if (Path.GetInvalidFileNameChars().Intersect(name).Any())
                return false;

            return true;
        }

        /// <summary>
        /// Converts an absolute path to a path relative to current working directory
        /// </summary>
        /// <param name="path">Absolute path</param>
        /// <returns>Relative path</returns>
        public static string GetRelativePath(string path)
        {
            return GetRelativePath(path, Environment.CurrentDirectory);
        }

        /// <summary>
        /// Converts an absolute path to a relative path
        /// </summary>
        /// <param name="path">Absolute path to file</param>
        /// <param name="relativeTo">Relative reference</param>
        /// <returns>Relative path</returns>
        public static string GetRelativePath(string path, string relativeTo)
        {
            Uri pathUri = new Uri(path);

            // Folder must end in backslash
            if (!relativeTo.EndsWith(Path.DirectorySeparatorChar.ToString()))
            {
                relativeTo += Path.DirectorySeparatorChar;
            }

            Uri folderUri = new Uri(relativeTo);
            Uri relativePath = pathUri.MakeRelativeUri(folderUri);

            return Uri.UnescapeDataString(relativeTo.ToString().Replace('/', Path.DirectorySeparatorChar));
        }
    }
}