using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Win32;
using RemoteSurvey.Ws;
using RemoteSurvey.Tools;
using System.Globalization;
using System.IO;

namespace Framework
{
    public class ManagerComputer
    {
        #region singleton

        /// <summary>   The instance. </summary>
        private static ManagerComputer instance = null;
        /// <summary>   The padlock. </summary>
        private static readonly object padlock = new object();

        ////////////////////////////////////////////////////////////////////////////////////////////////////
        /// <summary>
        /// Prevents a default instance of the <see cref="ManagerApplication"/> class from being created.
        /// </summary>
        ////////////////////////////////////////////////////////////////////////////////////////////////////

        ManagerComputer()
        {
            //if (_Log.IsDebugEnabled)
            // _Log.DebugFormat("New instance of {0}", Assembly.GetExecutingAssembly());
        }

        ////////////////////////////////////////////////////////////////////////////////////////////////////
        /// <summary>   Gets the instance. </summary>
        ///
        /// <value> The instance. </value>
        ////////////////////////////////////////////////////////////////////////////////////////////////////

        public static ManagerComputer Instance
        {
            get
            {
                lock (padlock)
                {
                    if (instance == null)
                    {
                        instance = new ManagerComputer();
                    }

                    return instance;
                }
            }
        }

        #endregion singleton
        
        ////////////////////////////////////////////////////////////////////////////////////////////////////
        /// <summary>
        /// Gets a list of installed software and, if known, the software's install path.
        /// </summary>
        ///
        /// <returns>   The installed software. </returns>
        ////////////////////////////////////////////////////////////////////////////////////////////////////

        public List<Application> GetInstalledSoftware()
        {
            //Declare the string to hold the list:
            List<Application> lstsoftware = new List<Application>();
            Application software = new Application();

            try
            {

                //The registry key:
                string softwareKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
                using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(softwareKey))
                {
                    //Let's go through the registry keys and get the info we need:
                    foreach (string skName in rk.GetSubKeyNames())
                    {
                        using (RegistryKey sk = rk.OpenSubKey(skName))
                        {
                            try
                            {
                                //If the key has value, continue, if not, skip it:
                                if (!(sk.GetValue("DisplayName") == null))
                                {
                                    software.Nom = sk.GetValue("DisplayName").ToString();
                                }

                                //Is the install location known?
                                if (sk.GetValue("InstallLocation") != null)
                                {
                                    software.Path = sk.GetValue("InstallLocation").ToString();
                                }

                                //Is the InstallDate known?
                                if (sk.GetValue("InstallDate") != null)
                                {
                                    software.InstallDate = (DateTime.Parse(sk.GetValue("InstallDate").ToString(), CultureInfo.CurrentCulture)).ToShortDateString();
                                }

                                //Is the UninstallString known?
                                if (sk.GetValue("UninstallString") != null)
                                {
                                    software.UninstallString = sk.GetValue("UninstallString").ToString();
                                }

                                //Is the QuietUninstallString known?
                                if (sk.GetValue("QuietUninstallString") != null)
                                {
                                    software.QuietUninstallString = sk.GetValue("UninstallString").ToString();
                                }

                                //Is the Comments known?
                                if (sk.GetValue("Comments") != null)
                                {
                                    software.Comments = sk.GetValue("Comments").ToString();
                                }

                                 //Is the DisplayVersion known?
                                if (sk.GetValue("DisplayVersion") != null)
                                {
                                    software.Version = sk.GetValue("DisplayVersion").ToString();
                                }

                            }
                            catch (Exception ex)
                            {
                                //No, that exception is not getting away... :P
                            }
                        }

                        lstsoftware.Add(software);
                    }
                }

            }
            catch (Exception ex)
            {
                ManagerLogger.Instance.LogException("RemoteSurvey", ex);
            }

            return lstsoftware;
        }


        ////////////////////////////////////////////////////////////////////////////////////////////////////
        /// <summary>   Check if a software is installed. </summary>
        ///
        /// <param name="psSoftwareName">   The ps software. </param>
        ///
        /// <returns>
        /// <c>true</c> if [is software installed] [the specified ps software]; otherwise, <c>false</c>.
        /// </returns>
        ////////////////////////////////////////////////////////////////////////////////////////////////////

        public bool IsSoftwareInstalled(string psSoftwareName)
        {
            List<Application> lst = new List<Application>();
            Boolean bReturn = false;

            try
            {
                lst = GetInstalledSoftware();

                if (lst.Where(p => p.Nom.ToUpper().Equals(psSoftwareName.ToUpper())).Count() > 0)
                {
                    bReturn = true;
                }
            }
            catch (Exception ex)
            {
                ManagerLogger.Instance.LogException("RemoteSurvey", ex);
            }

            return bReturn;
        }
    }
}