using Core.Parsers;

namespace Core.Utility;

public static class TextUtil
{
	/// <summary>
	/// Sanitizes input by normalizing hyphens (en-dash, em-dash -> regular hyphen).
	/// This allows parsers to assume normalized input.
	/// </summary>
	/// <param name="input">The input string to sanitize.</param>
	/// <returns>The sanitized string with normalized hyphens.</returns>
	public static string SanitizeInput(string input)
	{
		input = input.Replace("–", "-"); // en-dash
		input = input.Replace("—", "-"); // em-dash
		return input;
	}

	/// <summary>
	/// Parses a date from month name, day of month, and year.
	/// </summary>
	/// <param name="month">The month name (e.g., "January", "February"). Case-insensitive.</param>
	/// <param name="dayOfMonth">The day of the month as a string (e.g., "15", "3").</param>
	/// <param name="year">The year (e.g., 2025).</param>
	/// <returns>A <see cref="DateOnly"/> representing the parsed date.</returns>
	/// <exception cref="ArgumentException">Thrown when the month name is invalid.</exception>
	/// <exception cref="FormatException">Thrown when the day of month cannot be parsed as an integer.</exception>
	/// <exception cref="ArgumentOutOfRangeException">Thrown when the resulting date is invalid (e.g., February 30).</exception>
	public static DateOnly ParseDate(string month, string dayOfMonth, int year)
	{
		// Use normalized MonthNames array from grammar
		var monthLower = month.ToLower();
		var monthIndex = Array.FindIndex(EventOccurrenceGrammar.MonthNames, 
			m => m.ToLower() == monthLower);
		
		if (monthIndex < 0)
			throw new ArgumentException($"Invalid month: {month}", nameof(month));
		
		// Month index is 0-based, month number is 1-based
		int monthNum = monthIndex + 1;
		var day = int.Parse(dayOfMonth);
		return new DateOnly(year, monthNum, day);
	}

	/// <summary>
	/// Get the ordinal value of positive integers.
	/// </summary>
	/// <remarks>
	/// Only works for english-based cultures.
	/// Code from: http://stackoverflow.com/questions/20156/is-there-a-quick-way-to-create-ordinals-in-c/31066#31066
	/// With help: http://www.wisegeek.com/what-is-an-ordinal-number.htm
	/// </remarks>
	/// <param name="number">The number.</param>
	/// <returns>Ordinal value of positive integers, or <see cref="int.ToString"/> if less than 1.</returns>
	/// https://stackoverflow.com/a/620504/99492
	public static string Ordinal(this int number)
	{
		const string TH = "th";
		string s = number.ToString();

		// Negative and zero have no ordinal representation
		if (number < 1)
		{
			return s;
		}

		number %= 100;
		if ((number >= 11) && (number <= 13))
		{
			return s + TH;
		}

		switch (number % 10)
		{
			case 1: return s + "st";
			case 2: return s + "nd";
			case 3: return s + "rd";
			default: return s + TH;
		}
	}


	public static void ConsoleWriteTable(
		Func<int, int, bool> getVal, string rowHeader, int[] rowVars, string colHeader, int[] colVars)
	{
		var chl = $"     {colHeader} 0".Length;
		var rhl = $"{rowHeader} 0".Length + 3;
		Console.Write(new string(' ', rhl));
		foreach (var c in colVars)
		{
			Console.Write($"     {colHeader} {c + 1}");
		}
		Console.WriteLine();
		Console.WriteLine();
		foreach (var r in rowVars)
		{
			var rhead = $"{rowHeader} {r + 1}:";
			Console.Write(rhead.PadRight(rhl));
			foreach (var c in colVars)
			{
				var v = getVal(r, c) ? "1" : " ";
				Console.Write($"{v.PadLeft(chl)}");
			}

			Console.WriteLine();
		}
		Console.WriteLine();
	}
}