using System;

namespace DTLib.Filesystem
{
    public static class File
    {
        public static int GetSize(string file) => new System.IO.FileInfo(file).Length.ToInt();

        public static bool Exists(string file) => System.IO.File.Exists(file);

        // если файл не существует, создаёт файл, создаёт папки из его пути
        public static void Create(string file, bool delete_old = false)
        {
            if (delete_old && File.Exists(file))
                File.Delete(file);
            if (!File.Exists(file))
            {
                if (file.Contains("\\"))
                    Directory.Create(file.Remove(file.LastIndexOf('\\')));
                using System.IO.FileStream stream = System.IO.File.Create(file);
                stream.Close();
            }
        }

        public static void Copy(string srcPath, string newPath, bool replace = false)
        {
            if (!replace && Exists(newPath))
                throw new Exception($"file <{newPath}> alredy exists");
            Create(newPath);
            WriteAllBytes(newPath, ReadAllBytes(srcPath));
        }

        public static void Delete(string file) => System.IO.File.Delete(file);

        public static byte[] ReadAllBytes(string file)
        {
            using System.IO.FileStream stream = File.OpenRead(file);
            int size = GetSize(file);
            byte[] output = new byte[size];
            stream.Read(output, 0, size);
            stream.Close();
            return output;
        }

        public static string ReadAllText(string file) => ReadAllBytes(file).BytesToString();

        public static void WriteAllBytes(string file, byte[] content)
        {
            using System.IO.FileStream stream = File.OpenWrite(file);
            stream.Write(content, 0, content.Length);
            stream.Close();
        }

        public static void WriteAllText(string file, string content) => WriteAllBytes(file, content.ToBytes());

        public static void AppendAllBytes(string file, byte[] content)
        {
            using System.IO.FileStream stream = File.OpenAppend(file);
            stream.Write(content, 0, content.Length);
            stream.Close();
        }

        public static void AppendAllText(string file, string content) => AppendAllBytes(file, content.ToBytes());

        public static System.IO.FileStream OpenRead(string file) =>
            Exists(file) ? System.IO.File.OpenRead(file) : throw new Exception($"file not found: <{file}>");
        public static System.IO.FileStream OpenWrite(string file)
        {
            File.Create(file, true);
            return System.IO.File.Open(file, System.IO.FileMode.OpenOrCreate);
        }
        public static System.IO.FileStream OpenAppend(string file)
        {
            File.Create(file);
            return System.IO.File.Open(file, System.IO.FileMode.Append);
        }

        public static void CreateSymlink(string sourceName, string symlinkName)
        {
            if (symlinkName.Contains("\\"))
                Directory.Create(symlinkName.Remove(symlinkName.LastIndexOf('\\')));
            if (!Symlink.CreateSymbolicLink(symlinkName, sourceName, Symlink.SymlinkTarget.File))
                throw new InvalidOperationException($"some error occured while creating symlink\nFile.CreateSymlink({symlinkName}, {sourceName})");
        }
    }
}