using System;
using System.IO;
using System.Security.Permissions;
using System.Text;
using Compress.Utils;

namespace Compress.SevenZip.Structure
{
    public class StreamsInfo
    {
        public ulong PackPosition;
        public PackedStreamInfo[] PackedStreams;
        public Folder[] Folders;

        public void Read(BinaryReader br)
        {
            for (;;)
            {
                HeaderProperty hp = (HeaderProperty) br.ReadByte();
                switch (hp)
                {
                    case HeaderProperty.kPackInfo:
                        PackedStreamInfo.Read(br, out PackPosition, out PackedStreams);
                        continue;

                    case HeaderProperty.kUnPackInfo:
                        Folder.ReadUnPackInfo(br, out Folders);
                        continue;

                    case HeaderProperty.kSubStreamsInfo:
                        Folder.ReadSubStreamsInfo(br, ref Folders);
                        continue;

                    case HeaderProperty.kEnd:
                        return;

                    default:
                        throw new Exception(hp.ToString());
                }
            }
        }

        public void Write(BinaryWriter bw)
        {
            bw.Write((byte) HeaderProperty.kMainStreamsInfo);
            PackedStreamInfo.Write(bw, PackPosition, PackedStreams);
            Folder.WriteUnPackInfo(bw, Folders);
            Folder.WriteSubStreamsInfo(bw, Folders);
            bw.Write((byte) HeaderProperty.kEnd);
        }


        public void Report(ref StringBuilder sb)
        {
            sb.AppendLine("  StreamsInfo");
            sb.AppendLine("  -----------");
            sb.AppendLine($"  PackPosition = {PackPosition}");
            if (PackedStreams == null)
            {
                sb.AppendLine($"  PackedStreams[] = null");
            }
            else
            {
                sb.AppendLine($"  PackedStreams[] = ({PackedStreams.Length})");
                foreach (PackedStreamInfo psi in PackedStreams)
                {
                    psi.Report(ref sb);
                }
            }
            if (Folders == null)
            {
                sb.AppendLine($"  Folders[] = null");
            }
            else
            {
                sb.AppendLine($"  Folders[] = ({Folders.Length})");
                foreach (Folder f in Folders)
                {
                    f.Report(ref sb);
                }
            }
        }
    }
}