namespace Editor.IO
{
    using System;
    using System.IO;
    using System.Windows.Forms;


    public class TempHelper : IDisposable
    {
        private string m_baseDirectory;
        private string m_buildDirectory;
        private string m_addendumDirectory;

        public TempHelper(string addendum)
        {
            m_addendumDirectory = addendum;

            CreateTempDirectory();
        }

        public string TempDirectory
        {
            get { return m_buildDirectory; }
            set { m_buildDirectory = value; }
        }

        /// <summary>
        /// Creates a temporary directory in which to build content.
        /// </summary>
        private void CreateTempDirectory()
        {
            // Start with a standard base name:
            //
            //  %temp%\Editor.exe

            m_baseDirectory = Path.Combine(Path.GetTempPath(), Path.GetFileName(Application.ExecutablePath));

            // Include our process ID, in case there is more than
            // one copy of the program running at the same time:
            //
            //  %temp%\Editor.exe\<ProcessId>

            //int processId = Process.GetCurrentProcess().Id;
            //string processDirectory = Path.Combine(baseDirectory, processId.ToString());

            // Include a salt value, in case the program
            // creates more than one ContentBuilder instance:
            //
            //  %temp%\Editor.exe\<ProcessId>\<Salt>

            //directorySalt++;

            //buildDirectory = Path.Combine(processDirectory, directorySalt.ToString());
            if (!string.IsNullOrEmpty(m_addendumDirectory))
                m_buildDirectory = Path.Combine(m_baseDirectory, m_addendumDirectory);
            else
                m_buildDirectory = m_baseDirectory;

            // Create our temporary directory.
            Directory.CreateDirectory(m_buildDirectory);

            PurgeTempDirectory();
        }

        /// <summary>
        /// Deletes our temporary directory when we are finished with it.
        /// </summary>
        private void DeleteTempDirectory()
        {
            Directory.Delete(TempDirectory, true);
        }

        private void PurgeTempDirectory()
        {
            // Check all subdirectories of our base location.
            foreach (string directory in Directory.GetDirectories(m_buildDirectory))
            {
                Directory.Delete(directory, true);
            }
        }

        #region Implementation of IDisposable

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        private void Dispose(bool disposing)
        {
            if (disposing)
            {
                DeleteTempDirectory();
            }
        }

        #endregion
    }
}