///
/// Copyright (c) 2013-2019 Sensus Slovensko a.s.
///
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Xml.Serialization;
using log4net;

namespace TBF
{
    /// <summary>
    /// Class to be serialized to an XML file...
    /// Public members are local settings.
    /// These settings are modified by dialogs invoked by menu items
    ///   Edit->Preferences ... PreferencesDlg ... S1.1(language, etc. local settings), and
    ///   Edit->Advanced settings ... AdvancedSettingsDlg ... S1.2(spec. where bench settings are stored)
    /// </summary>
    [XmlRootAttribute("TestBenchFramework")]
    public class LocalSettings
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(LocalSettings));
        static XmlSerializer serializer = XmlSerializer.FromTypes(new[] { typeof(LocalSettings) })[0];

        ///
        /// Configuration file ecryption/decryption key and initialization vector
        ///
        static byte[] key = new byte[] { 83, 254, 105, 64, 184, 201, 195, 127, 52, 99, 77, 45, 252, 132, 163, 156 };
        static byte[] IV = new byte[] { 189, 23, 137, 56, 204, 241, 242, 118, 28, 89, 9, 198, 224, 111, 186, 125 };

		
		/// <summary>
        /// User interface language (used as CultureInfo(..) constructor argument).
        /// </summary>
        public string Language = "en";

        /// <summary>
        /// Names and database settings of test benches.
        /// </summary>
        [XmlArrayAttribute("TestBenches")]
        public Config.DatabaseSettings[] TestBenches;

        [XmlIgnore]
        public int BenchesCount { get { return (TestBenches != null) ? TestBenches.GetLength(0) : 0; } }

		/// <summary>
		/// Login method: UserName, FullName or Number
		/// </summary>
		public Users.Entities.LoginMethod LoginMethod;

        /// <summary>
        /// Currently selected bench name (local or remote) or null (= no selection done).
        /// </summary>
        [XmlElementAttribute("LastBench")]
        public string LastBenchName;

        /// <summary>
        /// Currently selected procedure name or null (= no selection done yet).
        /// </summary>
        [XmlElementAttribute("LastProcedure")]
        public string LastProcedureName;
        public bool LastProcedureIsRemote;
        public int LastProcedureNr;
		public int BatchNr;

		public int RightPaneHorizSplitterDistance;
		public int TopPaneVerticalSplitterDistance;

        /// MainWnd
        public bool MainWndMaximized;
        public int MainWndLeft;
        public int MainWndTop;
        public int MainWndWidth;
        public int MainWndHeight;

        /// Components
        public bool ComponentsDlgMaximized;
        public int ComponentsDlgLeft;
        public int ComponentsDlgTop;
        public int ComponentsDlgWidth;
        public int ComponentsDlgHeight;

        ///  Pop-up results
        public int PopupResultsLeft;
        public int PopupResultsTop;
        public int PopupResultsWidth;
        public int PopupResultsHeight;

        public Config.Entities.CameraDisplayResolution Resolution;

        [XmlArrayAttribute("Counters")]
        public int[] Counters;

		[XmlArrayAttribute("ComponentsColumnWidths")]
		public int[] ComponentsColumnWidths;
		[XmlIgnore]
		public int ComponentsColumnCount { get { return (ComponentsColumnWidths != null) ? ComponentsColumnWidths.Length : 0; } }

        /// Paths
        public bool PathsDlgMaximized;
        public int PathsDlgLeft;
        public int PathsDlgTop;
        public int PathsDlgWidth;
        public int PathsDlgHeight;

        [XmlArrayAttribute("FeedingColumnWidths")]
        public int[] FeedingColumnWidths;
        [XmlIgnore]
        public int FeedingColumnCount { get { return (FeedingColumnWidths != null) ? FeedingColumnWidths.Length : 0; } }

        [XmlArrayAttribute("BenchColumnWidths")]
        public int[] BenchColumnWidths;
        [XmlIgnore]
        public int BenchColumnCount { get { return (BenchColumnWidths != null) ? BenchColumnWidths.Length : 0; } }

        [XmlArrayAttribute("OutputColumnWidths")]
        public int[] OutputColumnWidths;
        [XmlIgnore]
        public int OutputColumnCount { get { return (OutputColumnWidths != null) ? OutputColumnWidths.Length : 0; } }

        [XmlArrayAttribute("MetersColumnWidths")]
        public int[] MetersColumnWidths;
        [XmlIgnore]
        public int MetersColumnCount { get { return (MetersColumnWidths != null) ? MetersColumnWidths.Length : 0; } }

        [XmlArrayAttribute("HeatMetersColumnWidths")]
        public int[] HeatMetersColumnWidths;
        [XmlIgnore]
        public int HeatMetersColumnCount { get { return (HeatMetersColumnWidths != null) ? HeatMetersColumnWidths.Length : 0; } }

        /// Transitions
        public bool TransitionsDlgMaximized;
        public int TransitionsDlgLeft;
        public int TransitionsDlgTop;
        public int TransitionsDlgWidth;
        public int TransitionsDlgHeight;

        [XmlArrayAttribute("TransitionsColumnWidths")]
        public int[] TransitionsColumnWidths;
        [XmlIgnore]
        public int TransitionsColumnCount { get { return (TransitionsColumnWidths != null) ? TransitionsColumnWidths.Length : 0; } }

        /// Metrology
        public bool MetrologyDlgMaximized;
        public int MetrologyDlgLeft;
        public int MetrologyDlgTop;
        public int MetrologyDlgWidth;
        public int MetrologyDlgHeight;

        /// Conditions
        public bool ConditionsDlgMaximized;
        public int ConditionsDlgLeft;
        public int ConditionsDlgTop;
        public int ConditionsDlgWidth;
        public int ConditionsDlgHeight;

        /// Uncertainty
        public bool UncertaintyDlgMaximized;
        public int UncertaintyDlgLeft;
        public int UncertaintyDlgTop;
        public int UncertaintyDlgWidth;
        public int UncertaintyDlgHeight;


        /// Procedures
        public bool ProceduresDlgMaximized;
        public int ProceduresDlgLeft;
        public int ProceduresDlgTop;
        public int ProceduresDlgWidth;
        public int ProceduresDlgHeight;

		[XmlArrayAttribute("ProceduresColumnWidths")]
		public int[] ProceduresColumnWidths;
		[XmlIgnore]
		public int ProceduresColumnCount { get { return (ProceduresColumnWidths != null) ? ProceduresColumnWidths.Length : 0; } }

        /// OneProcedure
        public bool OneProcedureDlgMaximized;
        public int OneProcedureDlgLeft;
        public int OneProcedureDlgTop;
        public int OneProcedureDlgWidth;
        public int OneProcedureDlgHeight;

        [XmlArrayAttribute("ProfilesColumnWidths")]
        public int[] ProfilesColumnWidths;
        [XmlIgnore]
        public int ProfilesColumnCount { get { return (ProfilesColumnWidths != null) ? ProfilesColumnWidths.Length : 0; } }

		public int PrintOrderLeft;
		public int PrintOrderTop;

		[XmlArrayAttribute("HistoryColumnWidths")]
		public int[] HistoryColumnWidths;
		[XmlIgnore]
		public int HistoryColumnCount { get { return (HistoryColumnWidths != null) ? HistoryColumnWidths.Length : 0; } }

		/// Endurance test cycle steps
		public int EnduranceDlgLeft;
		public int EnduranceDlgTop;
		public int EnduranceDlgWidth;
		public int EnduranceDlgHeight;

        /// iPerlCommunicationsForm
        public int iPerlCommunicationsFormLeft;
        public int iPerlCommunicationsFormTop;
        public long iPerlCommunicationsFormCheckboxes;

		/// Serial numbers
		public string[] LastSNTexts;
		[XmlIgnore]
		public int LastSNTextsCount { get { return (LastSNTexts != null) ? LastSNTexts.Length : 0; } }

		public string[] LastMainSNTexts;
		[XmlIgnore]
		public int LastMainSNTextsCount { get { return (LastMainSNTexts != null) ? LastMainSNTexts.Length : 0; } }

		public string[] LastAuxSNTexts;
		[XmlIgnore]
		public int LastAuxSNTextsCount { get { return (LastAuxSNTexts != null) ? LastAuxSNTexts.Length : 0; } }

        public string LastText1;
        public string LastText2;
        public string LastText3;
        public string LastRemark;

		/// Purchase order history
		public string[] PurchaseOrderHistory;
		[XmlIgnore]
		public int PurchaseOrderHistoryCount { get { return (PurchaseOrderHistory != null) ? PurchaseOrderHistory.Length : 0; } }

        /// Prefix history
        public string[] PrefixHistory;
        [XmlIgnore]
        public int PrefixHistoryCount { get { return (PrefixHistory != null) ? PrefixHistory.Length : 0; } }

        /// Remarks history
        public string[] RemarkHistory;
        [XmlIgnore]
        public int RemarksHistoryCount { get { return (RemarkHistory != null) ? RemarkHistory.Length : 0; } }
        
        /// Tester history
		public string[] TesterHistory;
		[XmlIgnore]
		public int TesterHistoryCount { get { return (TesterHistory != null) ? TesterHistory.Length : 0; } }

		public bool PrintOrderOnlyGoodResult;
		public bool PrintOrderOnlyLastResult;

        /// Legalizator history
        public string[] LastLegalizators;
        [XmlIgnore]
        public int LastLegalizatorsCount { get { return (LastLegalizators != null) ? LastLegalizators.Length : 0; } }

		/// Configuration of results
		public Config.Entities.MetersArrangement ResultsConfigMeters;
		public Config.Entities.TestsArrangement ResultsConfigTests;
		public int ResultsConfigMetersInOneGroup;
        public bool ShowDisabledPositions;
        public int ResultsConfigMinWidth;
        public int ResultsConfigMinHeight;
		public string[] RsltItems_Screen_SingleWM;
		public string[] RsltItems_Screen_CombinedWM;
		public string[] RsltItems_Screen_HeatM;

		/// Configuration of graphs
		public bool Graph1_On;
		public bool Graph2_On;
		public bool Graph3_On;
		public bool Graph4_On;
		public bool Graph5_On;
		public bool Graph6_On;
        public bool Graph7_On;
        public bool Graph8_On;
        public GraphLib.PlotterGraphPaneEx.LayoutMode GraphsLayoutMode;

		[XmlArrayAttribute("RsltsClmnWidths")]
		public int[] RsltsClmnWidths;
		[XmlIgnore]
		public int RsltsClmnCount { get { return (RsltsClmnWidths != null) ? RsltsClmnWidths.Length : 0; } }

        [XmlIgnore]
        public readonly bool AlwaysAskPasswdWhenUnlocking;

        [XmlIgnore]
        public readonly bool RestoreUserWhenLeavingDialog;
            

        public LocalSettings()
        {
            AlwaysAskPasswdWhenUnlocking = false;
            RestoreUserWhenLeavingDialog = true;
        }

        /// <summary>
        /// Load public fields of this class from the XML file.
        /// </summary>
        /// <param name="fileName">Name of the file.</param>
        /// <returns>
        /// LocalSettings object or null when Load() fails
        /// </returns>
		public static LocalSettings Load(string fileName)
        {
            try
            {
                bool isEncrypted = true;
				using (StreamReader reader = new StreamReader(fileName))
                {
                    isEncrypted = !reader.ReadLine().StartsWith("<?xml version=");
                    reader.Close();
                }

                if (isEncrypted)
                {
                    /// Write settings to a string
                    StringBuilder plain = new StringBuilder();

                    using (RijndaelManaged aes = new RijndaelManaged { Padding = PaddingMode.Zeros })
                    {
                        using (FileStream fsCrypt = new FileStream(fileName, FileMode.Open))
                        {
                            using (ICryptoTransform decryptor = aes.CreateDecryptor(key, IV))
                            {
                                using (CryptoStream cs = new CryptoStream(fsCrypt, decryptor, CryptoStreamMode.Read))
                                {
                                    using (MemoryStream mStream = new MemoryStream())
                                    {
                                        using (var writer = new BinaryWriter(mStream))
                                        {
                                            int data;
                                            while ((data = cs.ReadByte()) != -1)
                                            {
                                                if (data != 0) writer.Write((byte)data);
                                            }
                                            writer.Flush();
                                            mStream.Position = 0;

                                            using (var reader = new StreamReader(mStream))
                                            {
                                                LocalSettings ls = serializer.Deserialize(reader) as LocalSettings;
                                                log.WarnFormat("Succesfully loaded and decrypted from '{0}'", fileName);
                                                return ls;
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
                else
                {
                    using (StreamReader reader = new StreamReader(fileName))
                    {
                        LocalSettings ls = serializer.Deserialize(reader) as LocalSettings;
                        log.WarnFormat("Succesfully loaded from '{0}'", fileName);
                        return ls;
                    }
                }
            }
            catch (Exception e)
            {
                log.ErrorFormat("Failed to load from '{0}': {1}", fileName, e.Message);
                return null;
            }
        }

        /// <summary>
        /// Save public fields of this class to the XML file.
        /// </summary>
        public void Save()
        {
            try
            {
#if false
                /// Write settings to an unencrypted file
                using (TextWriter writer = new StreamWriter(Program.LocalSettingsFileName))
                {
                    serializer.Serialize(writer, this);
                    log.Warn("LocalSettings succesfully saved");
                }
#else
                /// Encrypt and write to file 'Program.LocalSettingsFileName'
                using (RijndaelManaged aes = new RijndaelManaged { Padding = PaddingMode.Zeros })
                {
                    using (FileStream fsCrypt = new FileStream(Program.LocalSettingsFileName, FileMode.Create))
                    {
                        using (ICryptoTransform encryptor = aes.CreateEncryptor(key, IV))
                        {
                            using (CryptoStream cs = new CryptoStream(fsCrypt, encryptor, CryptoStreamMode.Write))
                            {
                                using (MemoryStream mStream = new MemoryStream())
                                {
                                    using (var writer = new StreamWriter(mStream))
                                    {
                                        /// Serialize and write settings to a memory stream
                                        serializer.Serialize(writer, this);
                                        writer.Flush();
                                        mStream.Position = 0;

                                        using (var reader = new StreamReader(mStream))
                                        {
                                            /// Encrypt and write to file 'Program.LocalSettingsFileName'
                                            int data;
                                            while ((data = mStream.ReadByte()) != -1) cs.WriteByte((byte)data);

                                            log.WarnFormat("Succesfully encrypted and saved to '{0}'", Program.LocalSettingsFileName);
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
#endif
            }
            catch (Exception e)
            {
                log.ErrorFormat("Failed to save to '{0}': {1}", Program.LocalSettingsFileName, e.Message);
            }
        }


		/// <summary>
		/// Updates history stored in a string array by a new latest string.
		/// </summary>
		/// <param name="lastStrValue">Lste entered string</param>
		/// <returns>true = updated and saved</returns>
		public bool UpdateHistory(string lastStrValue, ref string[] history, int maxHistoryLen = 10)
		{
			if (string.IsNullOrEmpty(lastStrValue)) return false;

			int currentHistoryCount = (history != null) ? history.Length : 0;

			int match = -1;
			for (int i = 0; i < currentHistoryCount; i++)
			{
				if (history[i] == lastStrValue)
				{
					match = i;
					break;
				}
			}

			if (match >= 0 || currentHistoryCount >= maxHistoryLen)
			{
				/// History does not have to be (because of a match) or should not be extended (because of the lenght)
				if (match < 0) match = currentHistoryCount - 1;

				for (int j = match; j > 0; j--)
				{
					history[j] = history[j - 1];
				}
				history[0] = lastStrValue;
			}
			else
			{
				/// History wiil be extended, new item inserted at the beginning
				string[] newHistory = new string[currentHistoryCount + 1];
				newHistory[0] = lastStrValue;
				for (int j = 1; j <= currentHistoryCount; j++)
				{
					newHistory[j] = history[j - 1];
				}
				history = newHistory;
			}
			Save();
			return true;
		}
    }
}