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using System.Collections.Generic;
using System.Linq;

namespace Roulette
{
    public class TargetProfitWhenLosingAlgorithm : IAlgorithm
    {
        public double Amount { get; set; }
        public double TargetProfit { get; set; }
        public Bet Bet { get; set; }

        public TargetProfitWhenLosingAlgorithm()
        {
            this.Amount = .05d;
            this.TargetProfit = this.Amount;
        }

        public Bet ChooseBet(Outcome outcome, IEnumerable<Option> options)
        {
            if (ReferenceEquals(null, this.Bet))
            {
                var positiveOutcomes = options
                    .SelectMany(a => a.Outcomes)
                    .Where(a => a.Gain > 0)
                    ;
                var bestOddsPositiveOutcome = positiveOutcomes
                    .Where(a => a.Probability == positiveOutcomes.Max(b => b.Probability))
                    .First();
                this.Bet = new Bet()
                {
                    Amount = this.Amount
                    ,
                    Option = options
                        .Where(option => option.Outcomes.Contains(bestOddsPositiveOutcome))
                        .First()
                };
            }
            if (outcome.Gain < 0d)
            {
                return new Bet()
                {
                    Amount = this.TargetProfit - outcome.Gain
                    ,
                    Option = this.Bet.Option
                };
            }
            return this.Bet;
        }
    }
}