///
/// Copyright (c) 2021 Sensus Slovensko a.s.
///
using System;

namespace Common
{
    public static class Utils
    {
        public static string GetTestName(string name, int repeats, int repetitionNr)
        {
            if (name == null) return null;
            if (repeats == 1) return name;
            return string.Format("{0} ({1}/{2})", name, repetitionNr, repeats);
        }

        public static string SignificantDigitsToFmt(double value, int sigDigits)
        {
            if (sigDigits == 6)
            {
                if (value >= 99999.5 || value < -99999.5) return "F0";
                else if (value >= 9999.95 || value < -9999.95) return "F1";
                else if (value >= 999.995 || value < -999.995) return "F2";
                else if (value >= 99.9995 || value < -99.9995) return "F3";
                else if (value >= 9.99995 || value < -9.99995) return "F4";
                else if (value >= 0.999995 || value < -0.999995) return "F5";
                else if (value >= 0.0999995 || value < -0.0999995) return "F6";
                else if (value >= 0.00999995 || value < -0.00999995) return "F7";
                else if (value >= 0.000999995 || value < -0.000999995) return "F8";
                else if (value >= 0.0000999995 || value < -0.0000999995) return "F9";
                else return "F10";
            }
            else if (sigDigits == 5)
            {
                if (value >= 9999.5 || value < -9999.5) return "F0";
                else if (value >= 999.95 || value < -999.95) return "F1";
                else if (value >= 99.995 || value < -99.995) return "F2";
                else if (value >= 9.9995 || value < -9.9995) return "F3";
                else if (value >= 0.99995 || value < -0.99995) return "F4";
                else if (value >= 0.099995 || value < -0.099995) return "F5";
                else if (value >= 0.0099995 || value < -0.0099995) return "F6";
                else if (value >= 0.00099995 || value < -0.00099995) return "F7";
                else if (value >= 0.000099995 || value < -0.000099995) return "F8";
                else return "F9";
            }
            else if (sigDigits == 4)
            {
                if (value >= 999.5 || value < -999.5) return "F0";
                else if (value >= 99.95 || value < -99.95) return "F1";
                else if (value >= 9.995 || value < -9.995) return "F2";
                else if (value >= 0.9995 || value < -0.9995) return "F3";
                else if (value >= 0.09995 || value < -0.09995) return "F4";
                else if (value >= 0.009995 || value < -0.009995) return "F5";
                else if (value >= 0.0009995 || value < -0.0009995) return "F6";
                else if (value >= 0.00009995 || value < -0.00009995) return "F7";
                else return "F8";
            }
            else if (sigDigits == 3)
            {
                if (value >= 99.5 || value < -99.5) return "F0";
                else if (value >= 9.95 || value < -9.95) return "F1";
                else if (value >= 0.995 || value < -0.995) return "F2";
                else if (value >= 0.0995 || value < -0.0995) return "F3";
                else if (value >= 0.00995 || value < -0.00995) return "F4";
                else if (value >= 0.000995 || value < -0.000995) return "F5";
                else if (value >= 0.0000995 || value < -0.0000995) return "F6";
                else return "F7";
            }
            else if (sigDigits == 2)
            {
                if (value >= 9.5 || value < -9.5) return "F0";
                else if (value >= 0.95 || value < -0.95) return "F1";
                else if (value >= 0.095 || value < -0.095) return "F2";
                else if (value >= 0.0095 || value < -0.0095) return "F3";
                else if (value >= 0.00095 || value < -0.00095) return "F4";
                else if (value >= 0.000095 || value < -0.000095) return "F5";
                else return "F6";
            }
            else /// if (sigDigits == 1)
            {
                if (value >= 0.95 || value < -0.95) return "F0";
                else if (value >= 0.095 || value < -0.095) return "F1";
                else if (value >= 0.0095 || value < -0.0095) return "F2";
                else if (value >= 0.00095 || value < -0.00095) return "F3";
                else if (value >= 0.000095 || value < -0.000095) return "F4";
                else return "F5";
            }
        }

        /// <summary>
        /// Get either Q1 or Qmin flow for a given Qn and metrological class
        /// </summary>
        /// <param name="Qn">Nominal flow in m3/h</param>
        /// <param name="metroClass">Metrological class ("A" ,"B", "C" or "R#")</param>
        /// <param name="medium">NotSpecified, ColdWater or HotWater</param>
        /// <param name="Qdflt">Default flow when metrologic does not match pattern</param>
        /// <returns>Q1 or Qmin flow in m3/h</returns>
        public static double GetQ1Qmin(double Qn, string metroClass, Medium medium = Medium.ColdWater, double Qdflt = 0)
        {
            if (string.IsNullOrEmpty(metroClass)) return Qdflt;

            int metroClassRatio;
            if ((metroClass[0] == 'R') && int.TryParse(metroClass.Substring(1), out metroClassRatio) && (metroClassRatio > 0))
            {
                return Qn / (double)metroClassRatio;
            }
            else
            {
                if (medium == Medium.HotWater)
                {
                    switch (metroClass)
                    {
                        case "A": return (Qn < 15) ? (0.04 * Qn) : (0.08 * Qn);
                        case "B": return (Qn < 15) ? (0.02 * Qn) : (0.04 * Qn);
                        case "C": return (Qn < 15) ? (0.01 * Qn) : (0.02 * Qn);
                        case "D": return (Qn < 15) ? (0.01 * Qn) : Qdflt;
                        default: break;
                    }
                }
                else
                {
                    switch (metroClass)
                    {
                        case "A": return (Qn < 15) ? (0.04 * Qn) : (0.08 * Qn);
                        case "B": return (Qn < 15) ? (0.02 * Qn) : (0.03 * Qn);
                        case "C": return (Qn < 15) ? (0.01 * Qn) : (0.006 * Qn);
                        default: break;
                    }
                }
            }

            return Qdflt;
        }

        /// <summary>
        /// Get either Q2 or Qt flow for a given Qn and metrological class
        /// </summary>
        /// <param name="Qn">Nominal flow in m3/h</param>
        /// <param name="metroClass">Metrological class ("A" ,"B", "C" or "R#")</param>
        /// <param name="medium">NotSpecified, ColdWater or HotWater</param>
        /// <param name="Qdflt">Default flow when metrologic does not match pattern</param>
        /// <returns>Q2 or Qt flow in m3/h</returns>
        public static double GetQ2Qt(double Qn, string metroClass, Medium medium = Medium.ColdWater, double Qdflt = 0)
        {
            if (string.IsNullOrEmpty(metroClass)) return Qdflt;

            int metroClassRatio;
            if ((metroClass[0] == 'R') && int.TryParse(metroClass.Substring(1), out metroClassRatio) && (metroClassRatio > 0))
            {
                return 1.6 * Qn / (double)metroClassRatio;
            }

            if (medium == Medium.HotWater)
            {
                switch (metroClass)
                {
                    case "A": return (Qn < 15) ? (0.1 * Qn) : (0.2 * Qn);
                    case "B": return (Qn < 15) ? (0.08 * Qn) : (0.15 * Qn);
                    case "C": return (Qn < 15) ? (0.06 * Qn) : (0.1 * Qn);
                    case "D": return (Qn < 15) ? (0.015 * Qn) : Qdflt;
                    default: break;
                }
            }
            else
            {
                switch (metroClass)
                {
                    case "A": return (Qn < 15) ? (0.1 * Qn) : (0.3 * Qn);
                    case "B": return (Qn < 15) ? (0.08 * Qn) : (0.2 * Qn);
                    case "C": return (Qn < 15) ? (0.015 * Qn) : (0.015 * Qn);
                    default: break;
                }
            }

            return Qdflt;
        }

        /// <summary>
        /// Get either Q4 or Qmax flow for a given Qn and metrological class
        /// </summary>
        /// <param name="Qn">Nominal flow in m3/h</param>
        /// <param name="metroClass">Metrological class ("A" ,"B", "C" or "R#")</param>
        /// <param name="medium">NotSpecified, ColdWater or HotWater</param>
        /// <param name="Qdflt">Default flow when metrologic does not match pattern</param>
        /// <returns>Q4 or Qmax flow in m3/h</returns>
        public static double GetQ4Qmax(double Qn, string metroClass, Medium medium = Medium.ColdWater, double Qdflt = 0)
        {
            if (string.IsNullOrEmpty(metroClass)) return Qdflt;

            switch (metroClass[0])
            {
                case 'A':
                case 'B':
                case 'C':
                case 'D':
                    return 2 * Qn;
                case 'R':
                    return 1.25 * Qn;
                default:
                    return Qdflt;
            }
        }


        /// <summary>
        /// Checks requirements on the password regardless of the password history
        /// </summary>
        /// <param name="password">Password</param>
        /// <returns>true when the password is OK</returns>
        public static bool IsPasswordMeetsRequirements(string password, out string explanation)
        {
            int length = string.IsNullOrEmpty(password) ? 0 : password.Length;

            /// Password length must be at least 6
            if (length < CurrentUser.MinPasswdLength)
            {
                explanation = string.Format("Password must have at least {0} characters", CurrentUser.MinPasswdLength);
                return false;
            }
            else
            {
                explanation = string.Empty;
                return true;
            }
        }

        /// <summary>
        /// getHash encrypts a string 
        /// </summary>
        /// <param name="text">the string to encrypt</param>
        /// <returns></returns>
        public static string GetHash(string text)
        {
            byte[] bytes = System.Text.Encoding.Unicode.GetBytes(text);
            System.Security.Cryptography.SHA512Managed hashstring = new System.Security.Cryptography.SHA512Managed();
            byte[] hash = hashstring.ComputeHash(bytes);
            string hashString = string.Empty;
            foreach (byte x in hash)
            {
                hashString += String.Format("{0:x2}", x);
            }
            return hashString;
        }

        public static string EncodedStrToUserName(string encodedStr)
        {
            string[] subStrings = encodedStr.Split(new char[] { '~' });
            return (subStrings.Length >= 1) ? subStrings[0] : string.Empty;
        }

        public static string EncodedStrToFullName(string encodedStr)
        {
            string[] subStrings = encodedStr.Split(new char[] { '~' });
            return (subStrings.Length >= 2) ? subStrings[1] : string.Empty;
        }

        public static string EncodedStrToLegalizator(string encodedStr)
        {
            string[] subStrings = encodedStr.Split(new char[] { '~' });
            return (subStrings.Length >= 3) ? subStrings[2] : string.Empty;
        }

        /// <summary>
        /// Returns 'true' when authentication data are valid for a power user.
        /// </summary>
        /// <param name="userName">User name</param>
        /// <param name="password">Password</param>
        /// <returns>true = authenticated, false = refused</returns>
        public static bool IsPowerUser(string userName, string password)
        {
            DateTime date = DateTime.Now.Date;
            int number = (date.Year % 10) + 10 * (date.Month - 1) + 120 * date.Day;
            string passwordOfDay = Convert.ToString(number, 8);

            return (userName.Equals("milan") && password.Equals("kremik")) ||
                   (userName.Equals("igor") && password.Equals("mojronko8")) ||
                   (userName.Equals("MARIAN") && password.Equals("NM-309BN")) ||
                   (userName.Equals("lubo1212") && password.Equals("Tatry52")) ||
                   (userName.Equals("Michal") && password.Equals("1236natahA8")) ||
                   (userName.Equals("martin") && password.Equals("vaclavek84")) ||
                   (userName.Equals("pakan") && password.Equals("kuriatko")) ||
                   (userName.Equals("augustin") && password.Equals("jaugust")) ||
                   (userName.Equals("JCermak") && password.Equals("Zt6911")) ||
                   (userName.Equals("gilles") && password.Equals("alibaba")) ||
                   (userName.Equals(passwordOfDay) && password.Equals(passwordOfDay));
        }

        public static void CalculateFeatureVector(Iperl.OptoTelegramRaw[] optoData, int optoDataCount, int startIx, int endIx, ref float[] x)
        {
            if (startIx < 0 || endIx >= optoDataCount || startIx >= endIx) return;

            int n = 0;
            Int64 sumFlow = 0;
            Int64 sumFlow2 = 0;
            Int64 sumEmf = 0;
            Int64 sumEmf2 = 0;
            Int64 sumMagF = 0;
            Int64 sumMagF2 = 0;
            Int64 sumImp = 0;
            Int64 sumImp2 = 0;

            for (int ix = startIx; ix <= endIx; ix++)
            {
                if (optoData[ix].Flags == Iperl.OptoTelegramFlags.OK ||
                    optoData[ix].Flags == Iperl.OptoTelegramFlags.OK_TestStart ||
                    optoData[ix].Flags == Iperl.OptoTelegramFlags.OK_TestEnd)
                {
                    n++;
                    sumFlow += optoData[ix].FlowRaw;
                    sumFlow2 += ((int)optoData[ix].FlowRaw * (int)optoData[ix].FlowRaw);
                    sumEmf += (int)optoData[ix].EmfRaw;
                    sumEmf2 += ((Int64)optoData[ix].EmfRaw * (Int64)optoData[ix].EmfRaw);
                    sumMagF += optoData[ix].MagneticFieldRaw;
                    sumMagF2 += ((int)optoData[ix].MagneticFieldRaw * (int)optoData[ix].MagneticFieldRaw);
                    sumImp += optoData[ix].Impedance;
                    sumImp2 += ((int)optoData[ix].Impedance * (int)optoData[ix].Impedance);
                }
            }

            if (n >= 2)
            {
                if (x.Length > 0) x[0] = ((float)sumFlow2 - (float)sumFlow * (float)sumFlow / n) / (n - 1);
                if (x.Length > 1) x[1] = ((float)sumEmf2 - (float)sumEmf * (float)sumEmf / n) / (n - 1);
                if (x.Length > 2) x[2] = ((float)sumMagF2 - (float)sumMagF * (float)sumMagF / n) / (n - 1);
                if (x.Length > 3) x[3] = ((float)sumImp2 - (float)sumImp * (float)sumImp / n) / (n - 1);
            }
        }
    }
}