using System;
using System.Collections.Generic;
using Portoa.Persistence;

namespace VideoGameQuotes.Api {
	public abstract class CriterionHandler<T> where T : Entity<T, int> {
		public IEnumerable<Func<T, bool>> HandleCriterion(IEnumerable<object> values) {
			foreach (var value in values) {
				if (value is int) {
					yield return HandleInteger((int)value);
				} else {
					yield return HandleString((string)value);
				}
			}
		}

		protected virtual Func<T, bool> HandleInteger(int value) {
			throw new ApiException(string.Format("The value \"{0}\" is invalid", value));
		}

		protected virtual Func<T, bool> HandleString(string value) {
			throw new ApiException(string.Format("The value \"{0}\" is invalid", value));
		}
	}
}