#nullable enable

#region

using System;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Text.RegularExpressions;
using MySql.Data.MySqlClient;

#endregion

namespace website {
	public static class Utilities {
		private static readonly string MySqlPass =
			File.ReadAllText(AppDomain.CurrentDomain.BaseDirectory + "mysql.pass");

		private static readonly string MySqlHost =
			File.ReadAllText(AppDomain.CurrentDomain.BaseDirectory + "mysql.host");

		private static readonly string MySqlUser =
			File.ReadAllText(AppDomain.CurrentDomain.BaseDirectory + "mysql.user");

		public static MySqlConnection getConnection() {
			return new MySqlConnection("server=" + MySqlHost + ";pwd=" + MySqlPass + ";uid=" + MySqlUser +
			                           ";database=san_antonio_senior_golf;Port=5618;Convert Zero Datetime=True;");
		}

		/// <summary>
		///     Verify if string date can be converted to DateTime
		/// </summary>
		/// <param name="date"></param>
		/// <returns>True if date matches "^[0-9]{4}/[0-9]{2}/[0-9]{2}$"</returns>
		public static bool verifyDate(string? date) {
			if (date == null)
				return false;
			Regex regex = new("^[0-9]{4}/[0-9]{2}/[0-9]{2}$", RegexOptions.IgnoreCase);
			return regex.IsMatch(date);
		}

		/// <summary>
		///     Check if date param is applicable with verifyDate
		/// </summary>
		/// <param name="date">Not null string</param>
		/// <returns>DateTime equivalent of date param</returns>
		// TODO Creating 3 regex's is inefficient 
		public static DateTime stringDateToDateTime([NotNull] string date) {
			int year = int.Parse(new Regex("^[0-9]{4}$").Match(date).Value);
			int month = int.Parse(new Regex("/[0-9]{2}/$").Match(date).Value);
			int day = int.Parse(new Regex("/[0-9]{2}$").Match(date).NextMatch().Value);
			return new DateTime(year, month, day);
		}

		/// <summary>
		///     Verify if string time can be converted to TimeSpan using stringTimeToTimeSpan
		/// </summary>
		/// <param name="time"></param>
		/// <returns>True if time matches "^[0-9]{2}:[0-9]{2}:[0-9]{2}$"</returns>
		public static bool verifyTime(string? time) {
			if (time == null)
				return true;
			Regex regex = new("^[0-9]{2}:[0-9]{2}:[0-9]{2}$", RegexOptions.IgnoreCase);
			return regex.IsMatch(time);
		}

		/// <summary>
		///     Check if time param is applicable with verifyTime
		/// </summary>
		/// <param name="time">Not null string</param>
		/// <returns>TimeSpan equivalent of time string</returns>
		public static TimeSpan stringTimeToTimeSpan([NotNull] string time) {
			Match match = new Regex("^[0-9]{2}$").Match(time);
			int hours = int.Parse(match.Value);
			int minutes = int.Parse(match.NextMatch().Value);
			int seconds = int.Parse(match.NextMatch().Value);

			return new TimeSpan(hours, minutes, seconds);
		}
	}
}