///
/// Copyright (c) 2017-2018 Sensus Slovensko a.s.
///
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Common;

namespace Config
{
    public static class Utils
    {
        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>
        /// Extract and return a DB server from a MySQL connection string.
        /// </summary>
        public static string GetDBServer(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "SERVER=" });
        }

        /// <summary>
        /// Extract and return a DB name from a MySQL connection string.
        /// </summary>
        public static string GetDBName(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "DATABASE=" });
        }

        /// <summary>
        /// Extract and return a username from a MySQL connection string
        /// </summary>
        public static string GetDBUser(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "USER=", "UID=" });
        }

        /// <summary>
        /// Extract and return a password from a MySQL connection string
        /// </summary>
        public static string GetDBPassword(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "PASSWORD=", "PWD=" });
        }

        /// <summary>
        /// Extract and return an element of a MySQL connection string
        /// (a host, a database, a user name or a password).
        /// Return an empty string on any error.
        /// </summary>
        public static string GetFromConnectionString(string connectionString, string[] patterns)
        {
            foreach (var pattern in patterns)
            {
                int startIx = connectionString.IndexOf(pattern);
                if (startIx >= 0)
                {
                    /// pattern found, extract the subsequent element
                    startIx += pattern.Length;
                    int endIx = connectionString.IndexOf(';', startIx);
                    return (endIx > 0) ? connectionString.Substring(startIx, endIx - startIx) : string.Empty;
                }
            }

            /// pattern NOT found
            return string.Empty;
        }

        /// <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;
            }
        }
    }
}