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using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography.X509Certificates;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;
using XenOvf;
using XenOvf.Definitions;


namespace XenAdmin.Actions.OvfActions
{
	public partial class ExportApplianceAction : ApplianceAction
	{
		#region Private fields

		private readonly string m_applianceDirectory;
		private readonly string m_applianceFileName;
		private readonly List<VM> m_vmsToExport;
		private readonly IEnumerable<string> m_eulas;
		private readonly bool m_signAppliance;
		private readonly bool m_createManifest;
		private readonly X509Certificate2 m_certificate;
		private readonly bool m_encryptFiles;
		private readonly string m_encryptPassword;
		private readonly bool m_createOVA;
		private readonly bool m_compressOVFfiles;
        private readonly bool m_shouldVerify;
		private OvfCompressor m_compressor;

		#endregion

        public ExportApplianceAction(IXenConnection connection, string applianceDirectory, string applianceFileName, List<VM> vmsToExport,
            IEnumerable<string> eulas, bool signAppliance, bool createManifest, X509Certificate2 certificate,
            bool encryptFiles, string encryptPassword, bool createOVA, bool compressOVFfiles, bool shouldVerify)
            : base(connection, string.Format(createOVA ? Messages.EXPORT_OVA_PACKAGE : Messages.EXPORT_OVF_PACKAGE,
                applianceFileName, Helpers.GetName(connection)))
		{
			m_applianceDirectory = applianceDirectory;
			m_applianceFileName = applianceFileName;
			m_vmsToExport = vmsToExport;
			m_eulas = eulas;
			m_signAppliance = signAppliance;
			m_createManifest = createManifest;
			m_certificate = certificate;
			m_encryptFiles = encryptFiles;
			m_encryptPassword = encryptPassword;
			m_createOVA = createOVA;
			m_compressOVFfiles = compressOVFfiles;
            m_shouldVerify = shouldVerify;

			if (m_vmsToExport.Count == 1)
				VM = m_vmsToExport[0];
		}

        protected override void Run()
		{
            base.Run();

			var appFolder = Path.Combine(m_applianceDirectory, m_applianceFileName);
			var appFile = string.Format("{0}.ovf", m_applianceFileName);

			if (!Directory.Exists(appFolder))
				Directory.CreateDirectory(appFolder);

			Description = Messages.EXPORTING_VMS;

            var envList = new List<EnvelopeType>();

            foreach (VM vm in m_vmsToExport)
            {
                CheckForCancellation();

                try
                {
                    var envelope = Export(Connection, appFolder, m_applianceFileName, vm,
                        UpdateHandler, () => Cancelling, m_shouldVerify);
                    envList.Add(envelope);
                    PercentComplete += 80 / m_vmsToExport.Count;
                }
                catch (OperationCanceledException)
                {
                    throw new CancelledException();
                }
            }

            EnvelopeType env = OVF.Merge(envList, m_applianceFileName);
            PercentComplete = 80;

			foreach (var eula in m_eulas)
			{
                CheckForCancellation();
				Description = Messages.ADDING_EULAS;
				OVF.AddEula(env, eula);
			}

            CheckForCancellation();
			var ovfPath = Path.Combine(appFolder, appFile);
			Description = String.Format(Messages.CREATING_FILE, appFile);
			OVF.SaveAs(env, ovfPath);
			PercentComplete = 85;

            CheckForCancellation();

			if (m_signAppliance)
			{	
				Description = Messages.SIGNING_APPLIANCE;
				OVF.Sign(m_certificate, appFolder, appFile);
			}
			else if (m_createManifest)
			{
				Description = Messages.CREATING_MANIFEST;
				OVF.Manifest(appFolder, appFile);
			}

            PercentComplete = 90;
            CheckForCancellation();

			if (m_createOVA)
			{
				Description = String.Format(Messages.CREATING_FILE, String.Format("{0}.ova", m_applianceFileName));
				OVF.ConvertOVFtoOVA(appFolder, appFile, m_compressOVFfiles);
			}
			else if (m_compressOVFfiles)
			{
				Description = Messages.COMPRESSING_FILES;
				m_compressor = new OvfCompressor { CancelCompression = Cancelling }; //in case the Cancel button has already been pressed}

				try
				{
					m_compressor.CompressOvfFiles(ovfPath, "GZip");
				}
				catch (OperationCanceledException)
				{
					throw new CancelledException();
				}
			}

			PercentComplete = 100;
			Description = Messages.COMPLETED;
		}

        private void CheckForCancellation()
        {
            if (Cancelling)
                throw new CancelledException();
        }

		protected override void CancelRelatedTask()
		{
			base.CancelRelatedTask();

			if (m_compressor != null)
				m_compressor.CancelCompression = true;
		}
	}
}