namespace Backend.MarketDataRequest
{
	public enum HistoricalBarSize
	{
		OneMin,
		FiveMins,
		FifteenMins,
		OneHour,
		OneDay,
		FiveDays,
		OneMonth
	}

	public enum HistoricalWhatToShow
	{
		Trades,
		Bid,
		Ask,
		Midpoint
	}

	public sealed class HistoricalLinePoint
	{
		public string Timestamp { get; init; } = string.Empty;
		public double Price { get; init; }
	}

	public sealed class HistoricalEquityRequest
	{
		public int RequestId { get; init; }
		public string Symbol { get; init; } = string.Empty;

		// Example: "" or "20260311 11:00:00 US/Eastern"
		public string EndDateTime { get; init; } = string.Empty;

		// Examples: "1 H", "1 D", "5 D", "1 M"
		public string Duration { get; init; } = "1 D";

		public HistoricalBarSize BarSize { get; init; } = HistoricalBarSize.OneMin;
		public HistoricalWhatToShow WhatToShow { get; init; } = HistoricalWhatToShow.Trades;

		public bool UseRth { get; init; } = true;
		public bool KeepUpToDate { get; init; } = false;

		// IBKR formatDate=1 returns human-readable dates for intraday bars.
		public int FormatDate { get; init; } = 1;

		public void Validate()
		{
			if (RequestId <= 0)
				throw new ArgumentException("RequestId must be greater than 0.");

			if (string.IsNullOrWhiteSpace(Symbol))
				throw new ArgumentException("Symbol is required.");

			if (string.IsNullOrWhiteSpace(Duration))
				throw new ArgumentException("Duration is required.");

			if (string.IsNullOrWhiteSpace(EndDateTime))
				throw new ArgumentException("EndDateTime is required for this example.");
		}
	}

	public static class HistoricalRequestMappings
	{
		public static string ToIbString(this HistoricalBarSize BarSize) => BarSize switch
		{
			HistoricalBarSize.OneMin => "1 min",
			HistoricalBarSize.FiveMins => "5 mins",
			HistoricalBarSize.FifteenMins => "15 mins",
			HistoricalBarSize.OneHour => "1 hour",
			HistoricalBarSize.OneDay => "1 day",
			HistoricalBarSize.FiveDays => "5 days",
			HistoricalBarSize.OneMonth => "1 month",
			_ => throw new ArgumentOutOfRangeException(nameof(BarSize))
		};

		public static string ToIbString(this HistoricalWhatToShow whatToShow) => whatToShow switch
		{
			HistoricalWhatToShow.Trades => "TRADES",
			HistoricalWhatToShow.Bid => "BID",
			HistoricalWhatToShow.Ask => "ASK",
			HistoricalWhatToShow.Midpoint => "MIDPOINT",
			_ => throw new ArgumentOutOfRangeException(nameof(whatToShow))
		};
	}
}