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

namespace Aki.Launcher.MiniCommon
{
    public static class VFS
    {
        public static string Cwd { get; private set; }
        private static object mutex;

        static VFS()
        {
            Cwd = Environment.CurrentDirectory;
            mutex = new object();
        }

        /// <summary>
        /// Combine two filepaths.
        /// </summary>
        public static string Combine(string path1, string path2)
        {
            return Path.Combine(path1, path2);
        }

        /// <summary>
        /// Combines the filepath with the current working directory.
        /// </summary>
        public static string FromCwd(this string filepath)
        {
            return Combine(Cwd, filepath);
        }

        /// <summary>
        /// Get directory path of a filepath.
        /// </summary>
        public static string GetDirectory(this string filepath)
        {
            string value = Path.GetDirectoryName(filepath);
            return (!string.IsNullOrWhiteSpace(value)) ? value : "";
        }

        /// <summary>
        /// Get file of a filepath
        /// </summary>
        public static string GetFile(this string filepath)
        {
            string value = Path.GetFileName(filepath);
            return (!string.IsNullOrWhiteSpace(value)) ? value : "";
        }

        /// <summary>
        /// Get file name of a filepath
        /// </summary>
        public static string GetFileName(this string filepath)
        {
            string value = Path.GetFileNameWithoutExtension(filepath);
            return (!string.IsNullOrWhiteSpace(value)) ? value : "";
        }

        /// <summary>
        /// Get file extension of a filepath.
        /// </summary>
        public static string GetFileExtension(this string filepath)
        {
            string value = Path.GetExtension(filepath);
            return (!string.IsNullOrWhiteSpace(value)) ? value : "";
        }

        /// <summary>
        /// Move file from one place to another
        /// </summary>
        public static void MoveFile(string a, string b)
        {
            lock (mutex)
            {
                new FileInfo(a).MoveTo(b);
            }
        }

        /// <summary>
        /// Does the filepath exist?
        /// </summary>
        public static bool Exists(string filepath)
        {
            lock (mutex)
            {
                return Directory.Exists(filepath) || File.Exists(filepath);
            }
        }

        /// <summary>
        /// Create directory (recursive).
        /// </summary>
        public static void CreateDirectory(string filepath)
        {
            lock (mutex)
            {
                Directory.CreateDirectory(filepath);
            }
        }

        /// <summary>
        /// Get file content as bytes.
        /// </summary>
        public static byte[] ReadFile(string filepath)
        {
            lock (mutex)
            {
                return File.ReadAllBytes(filepath);
            }
        }

        /// <summary>
        /// Get file content as string.
        /// </summary>
        public static string ReadFile(string filepath, Encoding encoding = null)
        {
            return (encoding ?? Encoding.UTF8).GetString(ReadFile(filepath));
        }

        /// <summary>
        /// Write data to file.
        /// </summary>
        public static void WriteFile(string filepath, byte[] data, bool append = false)
        {
            lock (mutex)
            {
                if (!Exists(filepath))
                {
                    CreateDirectory(filepath.GetDirectory());
                }

                File.WriteAllBytes(filepath, data);
            }
        }

        /// <summary>
        /// Write string to file.
        /// </summary>
        public static void WriteFile(string filepath, string data, bool append = false, Encoding encoding = null)
        {
            WriteFile(filepath, (encoding ?? Encoding.UTF8).GetBytes(data), append);
        }

        /// <summary>
        /// Get directories in directory by full path.
        /// </summary>
        public static string[] GetDirectories(string filepath)
        {
            lock (mutex)
            {
                DirectoryInfo di = new DirectoryInfo(filepath);
                List<string> paths = new List<string>();

                foreach (DirectoryInfo directory in di.GetDirectories())
                {
                    paths.Add(directory.FullName);
                }

                return paths.ToArray();
            }
        }

        /// <summary>
        /// Get files in directory by full path.
        /// </summary>
        public static string[] GetFiles(string filepath)
        {
            lock (mutex)
            {
                DirectoryInfo di = new DirectoryInfo(filepath);
                List<string> paths = new List<string>();

                foreach (FileInfo file in di.GetFiles())
                {
                    paths.Add(file.FullName);
                }

                return paths.ToArray();
            }
        }

        /// <summary>
        /// Delete directory.
        /// </summary>
        public static void DeleteDirectory(string filepath)
        {
            lock (mutex)
            {
                DirectoryInfo di = new DirectoryInfo(filepath);

                foreach (FileInfo file in di.GetFiles())
                {
                    file.IsReadOnly = false;
                    file.Delete();
                }

                foreach (DirectoryInfo directory in di.GetDirectories())
                {
                    DeleteDirectory(directory.FullName);
                }

                di.Delete();
            }
        }

        /// <summary>
        /// Delete file.
        /// </summary>
        public static void DeleteFile(string filepath)
        {
            lock (mutex)
            {
                FileInfo file = new FileInfo(filepath);

                file.IsReadOnly = false;
                file.Delete();
            }
        }

        /// <summary>
        /// Get files count inside directory recusively
        /// </summary>
        public static int GetFilesCount(string filepath)
        {
            lock (mutex)
            {
                DirectoryInfo di = new DirectoryInfo(filepath);
                int count = 0;

                foreach (FileInfo file in di.GetFiles())
                {
                    ++count;
                }

                foreach (DirectoryInfo directory in di.GetDirectories())
                {
                    count += GetFilesCount(directory.FullName);
                }

                return count;
            }
        }
    }
}