using System.Collections.Generic;

namespace Pinwheel
{
    public class AwardsEngine
    {
        private readonly IList<IAwardRule> rules;
        public IEnumerable<IAwardRule> Rules
        {
            get { return rules; }
        }

        public AwardsEngine() : this(new List<IAwardRule>())
        {
        }

        public AwardsEngine(IRulesService rulesService)
            : this(rulesService.GetRules())
        {
        }

        public AwardsEngine(IEnumerable<IAwardRule> initialRules)
        {
            rules = new List<IAwardRule>(initialRules);
        }

        public virtual void Execute(AwardContext context)
        {
            foreach (var rule in Rules)
                rule.Execute(context);
        }

        public virtual void Register(IAwardRule rule)
        {
            rules.Add(rule);   
        }
    }
}