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

namespace System.Fire.Container {

    public partial class ContainerList {

        /// <summary>
        /// Exports an file from the container to the given path
        /// </summary>
        /// <param name="FileIndex">The container file index</param>
        /// <param name="ExportPath">Path to export the file to</param>
        /// <returns>Returns true if the export was successfull</returns>
        public bool ExportFile(int FileIndex, string ExportPath) {
            return this.ExportFile(this._files[FileIndex], ExportPath);
        }

        /// <summary>
        /// Exports an file from the container to the given path
        /// </summary>
        /// <param name="File">The container file index</param>
        /// <param name="ExportPath">Path to export the file to</param>
        /// <returns>Returns true if the export was successfull</returns>
        public bool ExportFile(ContainerFile File, string ExportPath) {
            FileInfo fi = new FileInfo(ExportPath);
            FileAttributes fa = new DirectoryInfo(fi.DirectoryName).Attributes;
            if ((fa | FileAttributes.ReadOnly) == fa) {
                System.Diagnostics.Debug.WriteLine(fi.DirectoryName + " is ReadOnly");
                return false;
            }
            if ((fa | FileAttributes.Hidden) == fa) {
                System.Diagnostics.Debug.WriteLine(fi.DirectoryName + " is Hidden");
            }

            if (!Directory.Exists(fi.DirectoryName))
                Directory.CreateDirectory(fi.DirectoryName);
            if (System.IO.File.Exists(ExportPath))
                System.IO.File.Delete(ExportPath);

            FileStream fs = new FileStream(ExportPath, FileMode.CreateNew);
            BinaryWriter bw = new BinaryWriter(fs);
            //byte Group = 0, Container = 0;
            //ushort Pos = 0;
            long size = 0;
            for (int i = 0, c = File.NumChunks; i < c; i++) {
                //File.GetChunk(i, ref Group, ref Container, ref Pos);
                byte[] b = this.ReadChunk(File.ChunkPos, i);
                if (size + b.Length > File.Size) {
                    bw.Write(b.Take((int)(File.Size - size)).ToArray());
                    size += File.Size - size;
                } else {
                    bw.Write(b);
                    size += b.Length;
                }

            }
            bw.Close();
            return true;
        }

    }
}