using System;
using Oracle.DataAccess.Client;

namespace Endpoint
{
	public class OracleEndpoint : IServiceEndpoint
	{
		private readonly OracleEndpointConfiguration _serviceEndpointConfiguration;

		public IServiceEndpointConfiguration ServiceEndpointConfiguration
		{
			get { return _serviceEndpointConfiguration; }
		}

		public string ServiceName
		{
			get { return _serviceEndpointConfiguration.Name; }
		}

		public string StatusDescription { get; private set; }

		public Status GetStatus()
		{
			using (OracleConnection oracleConnection = new OracleConnection(_serviceEndpointConfiguration.ConnectionString))
			using (OracleCommand oracleCommand = new OracleCommand(_serviceEndpointConfiguration.ScalarQueryString, oracleConnection))
			{
				try
				{
					oracleConnection.Open();
					object result = oracleCommand.ExecuteScalar();
					string resultString = result.ToString();
					if (resultString != _serviceEndpointConfiguration.ExpectedQueryResult)
					{
						StatusDescription = String.Format("Result was: '{0}', was expecting '{1}'", resultString,
						                                  _serviceEndpointConfiguration.ExpectedQueryResult);
						return Status.Error;
					}
				}
				catch(Exception ex)
				{
					StatusDescription = ex.Message;
					return Status.Error;
				}
			}
			StatusDescription = "OK";
			return Status.Up;
		}


		/// <summary>
		/// Initializes a new instance of the <see cref="OracleEndpoint"/> class.
		/// </summary>
		/// <param name="config">The config.</param>
		public OracleEndpoint(OracleEndpointConfiguration config)
		{
			_serviceEndpointConfiguration = config;
			StatusDescription = "";
		}
	}
}