using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace SafeMobileLib
{
    public static class ExtensionMethods
    {
        public static uint DateTo70Format(this DateTime param)
        {
            long nOfSeconds;
            DateTime dt70 = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            TimeSpan span = param - dt70;
            nOfSeconds = (long)span.TotalSeconds;
            return ((uint)nOfSeconds);
        }

        public static Int32 GetSecondsFromDT(this DateTime param)
        {
            DateTime datetime = param;
            Int32 nOfSeconds;
            DateTime dt70 = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            TimeSpan span = datetime - dt70;
            nOfSeconds = (Int32)span.TotalSeconds;
            return nOfSeconds;
        }

        public static DateTime GetDTFromSeconds(this uint param)
        {
            DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            dateTime = dateTime.AddSeconds((double)param);
            return dateTime;
        }

        public static DateTime GetDTFromSeconds(this int param)
        {
            DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            dateTime = dateTime.AddSeconds((double)param);
            return dateTime;
        }

        public static DateTime GetDTLocalFromSeconds(this uint param)
        {
            DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            dateTime = dateTime.AddSeconds((double)param);
            dateTime = dateTime.ToLocalTime();
            return dateTime;
        }

        public static DateTime GetDTLocalFromSeconds(this Int32 param)
        {
            DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            dateTime = dateTime.AddSeconds((double)param);
            dateTime = dateTime.ToLocalTime();
            return dateTime;
        }

        public static uint GetSecondsLocalFromDT(this DateTime param)
        {
            System.DateTime datetime = param;
            long nOfSeconds;
            System.DateTime dt70 = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            System.DateTime dttmp1 = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            System.DateTime dttmp2;
            dttmp2 = dttmp1.ToLocalTime();
            TimeSpan span2 = dttmp2 - dttmp1;
            TimeSpan span = datetime - dt70;
            if (System.TimeZone.CurrentTimeZone.IsDaylightSavingTime(param)) nOfSeconds = (long)span.TotalSeconds - (long)span2.TotalSeconds - 3600; //mai scot o ora - 3600
            else nOfSeconds = (long)span.TotalSeconds - (long)span2.TotalSeconds;
            return ((uint)nOfSeconds);
        }

        public static String TimeOfDayHHMMLocal(this Int32 param)
        {
            Int32 ParamLoc;
            ParamLoc = ConvertGMTToLocal(param);
            String toReturn = "";
            DateTime tempObj = ((uint)ParamLoc).GetDTFromSeconds();

            if (tempObj.Hour >= 10)
                toReturn = toReturn + tempObj.Hour.ToString() + ":";
            else
                toReturn = toReturn + "0" + tempObj.Hour.ToString() + ":";

            if (tempObj.Minute >= 10)
                toReturn = toReturn + tempObj.Minute.ToString();
            else
                toReturn = toReturn + "0" + tempObj.Minute.ToString();

            return toReturn;
        }

        public static Int32 ConvertGMTToLocal(this Int32 param)
        {
            DateTime time = (param).GetDTFromSeconds();
            DateTime GMTTime = time.ToUniversalTime();
            TimeSpan span = time - GMTTime;
            long nOfSeconds = (long)span.TotalSeconds;
            return (Int32)(nOfSeconds + param);
        }

        public static String TimeOfDayHHMMLocal(this Int32 param, Boolean AMPMtype)
        {
            Int32 ParamLoc;
            ParamLoc = ConvertGMTToLocal(param);
            String toReturn = "";
            DateTime tempObj = ((uint)ParamLoc).GetDTFromSeconds();
            Int32 hourX = tempObj.Hour;
            String Endis = "AM";

            if (AMPMtype)
            {
                if (hourX >= 12)
                {
                    hourX = hourX - 12;
                    if (hourX <= 0) hourX = 12;
                    Endis = "PM";
                }
            }

            if (hourX >= 10)
                toReturn = toReturn + hourX.ToString() + ":";
            else
                toReturn = toReturn + "0" + hourX.ToString() + ":";

            if (tempObj.Minute >= 10)
                toReturn = toReturn + tempObj.Minute.ToString();
            else
                toReturn = toReturn + "0" + tempObj.Minute.ToString();

            if (AMPMtype) toReturn = toReturn + " " + Endis;
            return toReturn;
        }

        public static String TimeOfDayHHMMSSLocal(this Int32 param, Boolean AMPMtype)
        {
            Int32 ParamLoc;
            ParamLoc = ConvertGMTToLocal(param);
            String toReturn = "";
            DateTime tempObj = ((uint)ParamLoc).GetDTFromSeconds();
            Int32 hourX = tempObj.Hour;
            String Endis = "AM";

            if (AMPMtype)
            {
                if (hourX >= 12)
                {
                    hourX = hourX - 12;
                    if (hourX <= 0) hourX = 12;
                    Endis = "PM";
                }
            }

            if (hourX >= 10)
                toReturn = toReturn + hourX.ToString() + ":";
            else
                toReturn = toReturn + "0" + hourX.ToString() + ":";

            if (tempObj.Minute >= 10)
                toReturn = toReturn + tempObj.Minute.ToString() + ":";
            else
                toReturn = toReturn + "0" + tempObj.Minute.ToString() + ":";

            if (tempObj.Second >= 10)
                toReturn = toReturn + tempObj.Second.ToString();
            else
                toReturn = toReturn + "0" + tempObj.Second.ToString();

            if (AMPMtype) toReturn = toReturn + " " + Endis;
            return toReturn;
        }


        public static String DateTimeOfDayHHMMLocal(this Int32 param)
        {
            Int32 ParamLoc;
            ParamLoc = ConvertGMTToLocal(param);
            String toReturn = "";
            DateTime tempObj = ((uint)ParamLoc).GetDTFromSeconds();

            if (tempObj.Hour >= 10)
                toReturn = toReturn + tempObj.Hour.ToString() + ":";
            else
                toReturn = toReturn + "0" + tempObj.Hour.ToString() + ":";

            if (tempObj.Minute >= 10)
                toReturn = toReturn + tempObj.Minute.ToString();
            else
                toReturn = toReturn + "0" + tempObj.Minute.ToString();
            toReturn = Convert.ToString(tempObj);
            return toReturn;
        }

        public static String GetRegionalFormat(this Int32 ValTime, Boolean is24hours, Boolean DayFirst)
        {
            String toreturn = "";
            if (is24hours)
            {
                if (DayFirst)
                    toreturn = ((uint)ValTime).GetDTLocalFromSeconds().ToString("dd/MM/yyyy HH:mm:ss");
                else
                    toreturn = ((uint)ValTime).GetDTLocalFromSeconds().ToString("MM/dd/yyyy HH:mm:ss");
            }
            else
            {
                if (DayFirst)
                    toreturn = ((uint)ValTime).GetDTLocalFromSeconds().ToString("dd/MM/yyyy hh:mm:ss tt");
                else
                    toreturn = ((uint)ValTime).GetDTLocalFromSeconds().ToString("MM/dd/yyyy hh:mm:ss tt");
            }
            return toreturn;
        }

        /// <summary>
        /// This method converts from local time to GMT
        /// </summary>
        /// <param name="param">local time, as UNIX time</param>
        /// <returns>GMT time, as UNIX time</returns>
        public static Int32 ConvertLocalToGMT(this Int32 param)
        {
            DateTime time = ((uint)param).GetDTFromSeconds();
            DateTime GMTTime = time.ToUniversalTime();
            TimeSpan span = GMTTime - time;
            Int32 nOfSeconds = (Int32)span.TotalSeconds;
            return (Int32)(nOfSeconds + param);
        }


        public static string FirstLetterToUpper(this string str)
        {
            if (str == null)
                return null;

            if (str.Length > 1)
                return char.ToUpper(str[0]) + str.Substring(1);

            return str.ToUpper();
        }


        public static string FromUnicode(this string str)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char c in str)
                sb.Append(GetEscapeSequence(c));

            return sb.ToString();


            //string inputString = new string(new char[] { '\u70B9', '\u83DC' }); // 点菜
        }

        public static string ToUnicode(this string str)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char c in str)
                sb.Append(GetEscapeSequence(c));

            return sb.ToString();
        }

        private static string GetEscapeSequence(char c)
        {
            return $"\\u{((int)c).ToString("X4")}";
        }




        public static string EncodeNonAsciiCharacters(this string value)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char c in value)
            {
                if (c > 127)
                {
                    // This character is too big for ASCII
                    string encodedValue = "\\u" + ((int)c).ToString("x4");
                    sb.Append(encodedValue);
                }
                else
                {
                    sb.Append(c);
                }
            }
            return sb.ToString();
        }

        public static string DecodeEncodedNonAsciiCharacters(this string value)
        {
            return Regex.Replace(
                value,
                @"\\u(?<Value>[a-zA-Z0-9]{4})",
                m => {
                    return ((char)int.Parse(m.Groups["Value"].Value, NumberStyles.HexNumber)).ToString();
                });
        }

        public static bool IsIpAddress(this string str)
        {

            //create our match pattern
            string pattern = @"^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$";
            //create our Regular Expression object
            Regex check = new Regex(pattern);
            //boolean variable to hold the status
            bool valid = false;
            //check to make sure an ip address was provided
            if (str == "")
            {
                //no address provided so return false
                valid = false;
            }
            else
            {
                //address provided so use the IsMatch Method
                //of the Regular Expression object
                valid = check.IsMatch(str, 0);
            }
            //return the results
            return valid;
        }
    }
}