using System.Text.RegularExpressions;

namespace YLErp.Modules.TQuoteModule
{
    public class OptionStrategyCodeParser
    {
        private static readonly Regex codePattern = new Regex(@"(?<sign>[\+-]?)\s*((?<notional>\d+)\*)?(?<underlying>[a-zA-Z]{1,2}[0-9]{3,4})(?<optionType>C|P)(?<maturity>\d+[DMWY]{1})(?<strike>[0-9]+(?:\.[0-9]*)?)");
        public static OptionStrategyCodeParts[] ParseOptionStrategyCode(string code)
        {
            var mc = codePattern.Matches(code);
            if (mc.Count == 0)
            {
                throw new ArgumentException(string.Format("不合法的策略代码:{0}", code));
            }
            return mc.Cast<Match>().Select(m => ParseOneMatch(m)).ToArray();
        }

        private static OptionStrategyCodeParts ParseOneMatch(Match m)
        {
            var parts = new OptionStrategyCodeParts();
            var groups = m.Groups;
            parts.UnderlyingCode = groups["underlying"].Value;
            parts.Strike = double.Parse(groups["strike"].Value);
            parts.Maturity = groups["maturity"].Value;
            var optionType = groups["optionType"].Value;
            if (optionType == "C")
            {
                parts.OptionType = "Call";
            }
            else if (optionType == "P")
            {
                parts.OptionType = "Put";
            }
            else
            { // Shouldn't come to here, the regex ensured only C|P is matched
                throw new ArgumentException(string.Format("不合法的期权类型{0}. 合法值为[CP]", optionType));
            }
            if (groups["notional"].Length > 0)
            {
                parts.Notional = int.Parse(groups["notional"].Value);
            }
            else
            {
                parts.Notional = 1;
            }
            if (groups["sign"].Length > 0)
            {
                if (groups["sign"].Value == "-")
                {
                    parts.IsSell = true;
                }
                else
                {
                    parts.IsSell = false;
                }
            }
            else
            {
                parts.IsSell = false;
            }
            return parts;
        }
    }
}