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

namespace Tango.Core.Helpers
{
    /// <summary>
    /// Contains several path helper methods.
    /// </summary>
    public static class PathHelper
    {
        /// <summary>
        /// Gets the user tango folder (%appdata%\Twine\Tango).
        /// </summary>
        /// <returns></returns>
        public static String GetUserTangoFolder()
        {
            return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Twine", "Tango");
        }

        /// <summary>
        /// Gets the application startup path.
        /// </summary>
        /// <returns></returns>
        public static String GetStartupPath()
        {
            return AppDomain.CurrentDomain.BaseDirectory;
        }

        /// <summary>
        /// Gets the solution folder.
        /// </summary>
        /// <returns></returns>
        public static String GetSolutionFolder()
        {
            DirectoryInfo path = new DirectoryInfo(GetStartupPath());

            while (path.Name != "Visual_Studio")
            {
                path = path.Parent;
            }

            return path.FullName;
        }

        /// <summary>
        /// Tries to delete the specified file.
        /// </summary>
        /// <param name="path">The file path.</param>
        /// <returns></returns>
        public static bool TryDeleteFile(String path)
        {
            try
            {
                File.Delete(path);
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// Copies the specified directory source path to the specified destination.
        /// </summary>
        /// <param name="sourcePath">The source path.</param>
        /// <param name="destinationPath">The destination path.</param>
        /// <param name="copySubDirs">if set to <c>true</c> will copy sub directories.</param>
        /// <exception cref="DirectoryNotFoundException">Source directory does not exist or could not be found: "
        ///                     + sourcePath</exception>
        public static void CopyDirectory(string sourcePath, string destinationPath, bool copySubDirs, Action<int, int> progress = null)
        {
            CopyDirectoryInternal(sourcePath, destinationPath, copySubDirs, progress, Directory.GetFiles(sourcePath, "*.*", SearchOption.AllDirectories).Length, 0);
        }

        private static void CopyDirectoryInternal(string sourcePath, string destinationPath, bool copySubDirs, Action<int, int> progress, int total, int current)
        {
            // Get the subdirectories for the specified directory.
            DirectoryInfo dir = new DirectoryInfo(sourcePath);

            if (!dir.Exists)
            {
                throw new DirectoryNotFoundException(
                    "Source directory does not exist or could not be found: "
                    + sourcePath);
            }

            DirectoryInfo[] dirs = dir.GetDirectories();
            // If the destination directory doesn't exist, create it.
            if (!Directory.Exists(destinationPath))
            {
                Directory.CreateDirectory(destinationPath);
            }

            // Get the files in the directory and copy them to the new location.
            FileInfo[] files = dir.GetFiles();
            foreach (FileInfo file in files)
            {
                string temppath = Path.Combine(destinationPath, file.Name);
                file.CopyTo(temppath, false);
                current++;
                progress?.Invoke(current, total);
            }

            // If copying subdirectories, copy them and their contents to new location.
            if (copySubDirs)
            {
                foreach (DirectoryInfo subdir in dirs)
                {
                    string temppath = Path.Combine(destinationPath, subdir.Name);
                    CopyDirectoryInternal(subdir.FullName, temppath, copySubDirs, progress, total, current);
                }
            }
        }
    }
}