using System;
using System.IO;
using RamDavisk.Ramfs.Inters;
using WebDAVSharp.Server.Stores;

namespace RamDavisk.Ramfs
{
    internal class WebDavRamfsStoreDocument : WebDavRamfsStoreItem, IWebDavStoreDocument
    {
        private readonly MemoryStream _buf;

        public WebDavRamfsStoreDocument()
        {
            _buf = new MemoryStream();
        }

        public Stream OpenReadStream() => new StreamWrap(_buf);

        public Stream OpenWriteStream(bool append)
        {
            try
            {
                var s = new StreamWrap(_buf);
                if (append) s.Position = _buf.Position;
                return s;
            }
            finally
            {
                ModificationDate = DateTime.Now;
            }
        }

        public override long Size => _buf.Length;

        public override string Etag => ModificationDate.GetHashCode().ToString();

        public override bool IsCollection => false;

        public override void Dispose()
        {
            _buf.Dispose();
            GC.Collect();
        }
    }
}