// Copyright (C) 2024, The Duplicati Team
// https://duplicati.com, hello@duplicati.com
// 
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.

using System;
using System.IO;

namespace Duplicati.Library.Encryption
{
    internal class GPGStreamWrapper : Utility.OverrideableStream
    {
        private System.Diagnostics.Process m_p;
        private System.Threading.Thread m_t;

        /// <summary>
        /// Wraps a crypto stream, ensuring that it is correctly disposed
        /// </summary>
        /// <param name="basestream">The stream to wrap</param>
        public GPGStreamWrapper(System.Diagnostics.Process p, System.Threading.Thread t, Stream basestream)
            : base(basestream)
        {
            if (p == null)
                throw new NullReferenceException("p");
            if (t == null)
                throw new NullReferenceException("t");
            
            m_p = p;
            m_t = t;
        }

        protected override void Dispose(bool disposing)
        {
            if (m_p != null)
            {
                m_basestream.Close();

                if (!m_t.Join(5000))
                    throw new System.Security.Cryptography.CryptographicException(Strings.GPGStreamWrapper.GPGFlushError);

                if (!m_p.WaitForExit(5000))
                    throw new System.Security.Cryptography.CryptographicException(Strings.GPGStreamWrapper.GPGTerminateError);

                if (!m_p.StandardError.EndOfStream)
                {
                    string errmsg = m_p.StandardError.ReadToEnd();
                    if (errmsg.Contains("decryption failed:"))
                        throw new System.Security.Cryptography.CryptographicException(Strings.GPGStreamWrapper.DecryptionError(errmsg));
                }

                m_p.Dispose();
                m_p = null;

                m_t = null;
            }

            base.Dispose(disposing);
        }
    }
}