using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace JsonRPC4.Router
{
	public class RpcParameters
	{
		public object Value
		{
			get;
		}

		public bool IsDictionary
		{
			get;
		}

		public Dictionary<string, IRpcParameter> AsDictionary
		{
			get
			{
				CheckValue(isDictionary: true);
				return (Dictionary<string, IRpcParameter>)Value;
			}
		}

		public List<IRpcParameter> AsList
		{
			get
			{
				CheckValue(isDictionary: false);
				return (List<IRpcParameter>)Value;
			}
		}

		public RpcParameters(Dictionary<string, IRpcParameter> parameters)
		{
			Value = (parameters ?? throw new ArgumentNullException("parameters"));
			IsDictionary = true;
		}

		public RpcParameters(List<IRpcParameter> parameters)
		{
			Value = (parameters ?? throw new ArgumentNullException("parameters"));
			IsDictionary = false;
		}

		public RpcParameters(params IRpcParameter[] parameters)
		{
			Value = (parameters?.ToList() ?? throw new ArgumentNullException("parameters"));
			IsDictionary = false;
		}

		private void CheckValue(bool isDictionary)
		{
			if (isDictionary != IsDictionary)
			{
				throw new InvalidOperationException();
			}
		}
	}
}