using System;
using System.Diagnostics;
using System.IO;
using System.IO.Packaging;

namespace ShrlAlgoStudio.RevitLess
{

    public class Storage : RevitLess.StorageBase, IDisposable
    {

        #region Private Variables

        private BasicFileInfo basicInfo;
        private PreviewImage thumbnailImage;

        #endregion

        #region Constructors

        public Storage(string fileName)
         : base(fileName)
        {
            if (File.Exists(fileName) == false)
            {
                throw new FileNotFoundException(string.Format("The file \"{0}\" was not found.", fileName));
            }
            FileName = fileName;
            OpenStructuredStorageFile();
            if (IsInitialized == false)
            {
                if (StorageRoot != null)
                {
                    CloseStorageRoot(StorageRoot);
                }
                return;
            }
            BasicInfo = new BasicFileInfo(FileName, StorageRoot);
            ThumbnailImage = new PreviewImage(FileName, StorageRoot);
            if (StorageRoot != null)
            {
                CloseStorageRoot(StorageRoot);
            }
        }

        #endregion

        #region IDisposable Implementation

        private bool disposed;

        /// <summary>
        /// <para>This method handles disposal of the OleDbAccess object.</para>
        /// </summary>
        /// <param name="disposing">A flag to check for redundant calls.</param>
        protected virtual void Dispose(bool disposing)
        {
            if (disposed == false)
            {
                // Release Unmanaged Resources
                if (disposing)
                {
                    // Release Managed Resources
                    if (StorageRoot != null)
                    {
                        CloseStorageRoot(StorageRoot);
                    }
                }

                disposed = true;
            }
        }

        /// <summary>
        /// <para></para>
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        // This code is used to help detect any instances of this class that are not
        // properly disposed. If this class is properly disposed, the finalizer is
        // suppressed in the Dispose() method above and the finalizer method below
        // is never called by runtime garbabe collection. If an instance of this
        // is not properly disposed, the finalizer will be called, and the
        // Debug.Assert method will display the StackTrace info, the thread and the time.
#if DEBUG

        //  /// <summary>
        //  /// <para>Finalizer method for the OleDbAccess class.</para>
        //  /// </summary>
        //  /// <remarks><para>
        //  /// This should never be called if the object is properly disposed. 
        //  /// This method should never be removed or commented out.
        //  /// </para></remarks>
        //  ~UserPage()
        //  {
        ////   string newLine = Environment.NewLine;
        ////   string disposeFailMessage = string.Format("StackTrace for Disposal Failure: {0}{1}The Thread Name for the Disposal Failure: {2}{3}The Time of the Disposal Failure: {4}{5} @ {6}", 
        ////    newLine, _debugStackTrace.ToString(), 
        ////    newLine, _debugThreadName, 
        ////    newLine, _debugTime.ToShortDateString(),  _debugTime.ToShortTimeString());
        ////   LogManager.LogMessage(disposeFailMessage, LogManager.LogSeverityType.Error);
        ////   Debug.Assert(false, disposeFailMessage);
        //  }

#endif

        #endregion

        #region Public Properties

        public BasicFileInfo BasicInfo
        {
            get
            {
                if (basicInfo.IsInitialized == false)
                {
                    basicInfo.ReadStructuredStorageFile();
                }
                return basicInfo;
            }
            set
            {
                basicInfo = value;
            }
        }

        public PreviewImage ThumbnailImage
        {
            get
            {
                if (thumbnailImage.IsInitialized == false)
                {
                    thumbnailImage.ReadStructuredStorageFile();
                }
                return thumbnailImage;
            }
            set
            {
                thumbnailImage = value;
            }
        }

        //public bool IsInitialized
        //{
        // get
        // {
        //  return _isInitialized;
        // }
        // protected set
        // {
        //  _isInitialized = value;
        // }
        //}

        //public string FileName
        //{
        // get
        // {
        //  return _fileName;
        // }
        // protected set
        // {
        //  _fileName = value;
        // }
        //}

        //public string FileExtension
        //{
        // get
        // {
        //  if(string.IsNullOrEmpty(FileName))
        //  {
        //   return string.Empty;
        //  }

        //  return Path.GetExtension(FileName).Replace(".", string.Empty);
        // }
        //}

        //public DocumentType DocType
        //{
        // get
        // {
        //  if(string.IsNullOrEmpty(FileExtension))
        //  {
        //   return DocumentType.Unknown;
        //  }

        //  switch(FileExtension.ToUpper())
        //  {
        //   case "RVT":
        //    return DocumentType.Project;

        //   case "RTE":
        //    return DocumentType.ProjectTemplate;

        //   case "RFA":
        //    return DocumentType.Family;

        //   case "RFT":
        //    return DocumentType.FamilyTemplate;

        //   default:
        //    return DocumentType.Unknown;
        //  }
        // }
        //}

        #endregion

        #region Private Properties

        private StorageInfo StorageRoot { get; set; }

        #endregion


        #region Private Methods

        private void OpenStructuredStorageFile()
        {
            //int checkResult = IsStorageFile(FileName);
            IsInitialized = false;
            //if(checkResult == 0)
            //{
            // return;
            //}

            try
            {
                StorageRoot = GetStorageRoot(FileName);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
            }
        }

        //private int IsStorageFile(string fileName)
        //{
        // return Ole32.StgIsStorageFile(FileName);
        //}

        private StorageInfo GetStorageRoot(string fileName)
        {
            try
            {
                StorageInfo storageRoot = (StorageInfo)InvokeStorageRootMethod(null,
                                                                               "Open",
                                                                               fileName,
                                                                               FileMode.Open,
                                                                               FileAccess.Read,
                                                                               FileShare.Read);
                if (storageRoot == null)
                {
                    IsInitialized = false;
                    throw new Exception(string.Format("Unable to open \"{0}\" as a structured storage file.", fileName));
                }
                IsInitialized = true;
                return storageRoot;
            }
            catch (Exception ex)
            {
                IsInitialized = false;
                Debug.WriteLine(ex.Message);
            }
            return null;
        }

        private void CloseStorageRoot(StorageInfo storageRoot)
        {
            InvokeStorageRootMethod(storageRoot, "Close");
        }

        #endregion

    }
}