using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Diagnostics;
using System.Text.RegularExpressions;
using System.IO.Ports;
using System.Net.Sockets;
using Elwig.Dialogs;

namespace Elwig.Helpers {
    public static partial class Utils {

        public static int CurrentYear => DateTime.Now.Year;
        public static int CurrentNextSeason => DateTime.Now.Year - (DateTime.Now.Month <= 3 ? 1 : 0);
        public static int CurrentLastSeason => DateTime.Now.Year - (DateTime.Now.Month <= 7 ? 1 : 0);
        public static DateTime Today => (DateTime.Now.Hour >= 3) ? DateTime.Today : DateTime.Today.AddDays(-1);

        public static readonly Regex SerialRegex = GeneratedSerialRegex();
        public static readonly Regex TcpRegex = GeneratedTcpRegex();

        [GeneratedRegex("^serial://([A-Za-z0-9]+):([0-9]+)(,([5-9]),([NOEMSnoems]),(0|1|1\\.5|2|))?$", RegexOptions.Compiled)]
        private static partial Regex GeneratedSerialRegex();

        [GeneratedRegex("^tcp://([A-Za-z0-9._-]+):([0-9]+)$", RegexOptions.Compiled)]
        private static partial Regex GeneratedTcpRegex();

        public static SerialPort OpenSerialConnection(string connection) {
            var m = SerialRegex.Match(connection);
            if (!m.Success)
                throw new ArgumentException("Invalid connection string for scheme \"serial\"");

            var stop = m.Groups[6].Value;
            var parity = m.Groups[5].Value.ToUpper();
            var data = m.Groups[4].Value;
            var port = new SerialPort() {
                PortName = m.Groups[1].Value,
                BaudRate = int.Parse(m.Groups[2].Value),
                Parity = parity == "E" ? Parity.Even :
                         parity == "O" ? Parity.Odd :
                         parity == "M" ? Parity.Mark :
                         parity == "S" ? Parity.Space :
                                         Parity.None,
                DataBits = data == "" ? 8 : int.Parse(data),
                StopBits = (StopBits)(stop == "" ? 1 : stop == "1.5" ? 3 : stop[0] - '0'),
                Handshake = Handshake.None,
                ReadTimeout = 1000,
                WriteTimeout = 1000,
            };
            port.Open();
            return port;
        }

        public static TcpClient OpenTcpConnection(string connection) {
            var m = TcpRegex.Match(connection);
            if (!m.Success)
                throw new ArgumentException("Invalid connection string for scheme \"tcp\"");

            var client = new TcpClient() {
                SendTimeout = 1000,
                ReceiveTimeout = 1000,
            };
            client.Connect(m.Groups[1].Value, int.Parse(m.Groups[2].Value));
            return client;
        }

        public static int Modulo(string a, int b) {
            if (a.Length == 0 || !a.All(char.IsAsciiDigit)) {
                throw new ArgumentException("First argument has to be a decimal string");
            } else if (b < 2) {
                throw new ArgumentException("Second argument has to be greater than 1");
            }
            return a.Select(ch => ch - '0').Aggregate((sum, n) => (sum * 10 + n) % b);
        }

        public static void RunBackground(string title, Func<Task> a) {
            Task.Run(async () => {
                try {
                    await a();
                } catch (Exception e) {
                    MessageBox.Show(e.ToString(), title, MessageBoxButton.OK, MessageBoxImage.Error);
                }
            });
        }

        public static void MailTo(string emailAddress) {
            Process.Start(new ProcessStartInfo() {
                FileName = $"mailto:{emailAddress}",
                UseShellExecute = true,
            });
        }

        public static double KmwToOe(double kmw) {
            return Math.Round(kmw * (4.54 + 0.022 * kmw), 0);
        }

        public static double OeToKmw(double oe) {
            return Math.Round((-4.54 + Math.Sqrt(4.54 * 4.54 - 4 * 0.022 * -oe)) / (2 * 0.022), 1);
        }

        public static decimal DecFromDb(long value, byte precision) {
            bool neg = value < 0;
            if (neg) value = -value;
            return new((int)(value & 0xFFFFFFFF), (int)((value >> 32) & 0x7FFFFFFF), 0, neg, precision);
        }

        public static long DecToDb(decimal value, byte precision) {
            return (long)decimal.Round(value * (decimal)Math.Pow(10, precision), 0);
        }

        public static int GetAge(DateOnly birthday) {
            var today = DateTime.Today;
            var a = (today.Year * 100 + today.Month) * 100 + today.Day;
            var b = (birthday.Year * 100 + birthday.Month) * 100 + birthday.Day;
            return (a - b) / 10000;
        }

        public static int GetSearchScore(IEnumerable<string?> words, IEnumerable<string> searchKeywords) {
            searchKeywords = searchKeywords.Where(s => s.Length >= 2 || (s.Length > 0 && s.All(c => char.IsAsciiDigit(c))));
            if (!searchKeywords.Any())
                return 0;

            words = words.Select(w => w?.ToLower());
            int i = 0;
            foreach (string? c in words) {
                if (c == null) continue;
                var parts = c.Split(" ");
                if (searchKeywords.Any(f => c == f)) {
                    i += 100;
                } else if (searchKeywords.Any(f => parts.Any(a => a == f))) {
                    i += 90;
                } else if (searchKeywords.Any(f => parts.Any(a => a.StartsWith(f)))) {
                    i += 50;
                } else if (searchKeywords.Any(f => f != null && c.Contains(f))) {
                    i += 1;
                }
            }
            return i;
        }

        public static (int, string?)? ShowManualWeighingDialog() {
            var d = new ManualWeighingDialog();
            return d.ShowDialog() == true ? (d.Weight, d.Reason) : null;
        }
    }
}