#region Copyright notice and license
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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#endregion

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

using Grpc.Core;
using Grpc.Health.V1Alpha;
using NUnit.Framework;

namespace Grpc.HealthCheck.Tests
{
    /// <summary>
    /// Tests for HealthCheckServiceImpl
    /// </summary>
    public class HealthServiceImplTest
    {
        [Test]
        public void SetStatus()
        {
            var impl = new HealthServiceImpl();
            impl.SetStatus("", "", HealthCheckResponse.Types.ServingStatus.SERVING);
            Assert.AreEqual(HealthCheckResponse.Types.ServingStatus.SERVING, GetStatusHelper(impl, "", ""));

            impl.SetStatus("", "", HealthCheckResponse.Types.ServingStatus.NOT_SERVING);
            Assert.AreEqual(HealthCheckResponse.Types.ServingStatus.NOT_SERVING, GetStatusHelper(impl, "", ""));

            impl.SetStatus("virtual-host", "", HealthCheckResponse.Types.ServingStatus.UNKNOWN);
            Assert.AreEqual(HealthCheckResponse.Types.ServingStatus.UNKNOWN, GetStatusHelper(impl, "virtual-host", ""));

            impl.SetStatus("virtual-host", "grpc.test.TestService", HealthCheckResponse.Types.ServingStatus.SERVING);
            Assert.AreEqual(HealthCheckResponse.Types.ServingStatus.SERVING, GetStatusHelper(impl, "virtual-host", "grpc.test.TestService"));
        }

        [Test]
        public void ClearStatus()
        {
            var impl = new HealthServiceImpl();
            impl.SetStatus("", "", HealthCheckResponse.Types.ServingStatus.SERVING);
            impl.SetStatus("virtual-host", "", HealthCheckResponse.Types.ServingStatus.UNKNOWN);

            impl.ClearStatus("", "");

            Assert.Throws(Is.TypeOf(typeof(RpcException)).And.Property("Status").Property("StatusCode").EqualTo(StatusCode.NotFound), () => GetStatusHelper(impl, "", ""));
            Assert.AreEqual(HealthCheckResponse.Types.ServingStatus.UNKNOWN, GetStatusHelper(impl, "virtual-host", ""));
        }

        [Test]
        public void ClearAll()
        {
            var impl = new HealthServiceImpl();
            impl.SetStatus("", "", HealthCheckResponse.Types.ServingStatus.SERVING);
            impl.SetStatus("virtual-host", "", HealthCheckResponse.Types.ServingStatus.UNKNOWN);

            impl.ClearAll();
            Assert.Throws(typeof(RpcException), () => GetStatusHelper(impl, "", ""));
            Assert.Throws(typeof(RpcException), () => GetStatusHelper(impl, "virtual-host", ""));
        }

        [Test]
        public void NullsRejected()
        {
            var impl = new HealthServiceImpl();
            Assert.Throws(typeof(ArgumentNullException), () => impl.SetStatus(null, "", HealthCheckResponse.Types.ServingStatus.SERVING));
            Assert.Throws(typeof(ArgumentNullException), () => impl.SetStatus("", null, HealthCheckResponse.Types.ServingStatus.SERVING));

            Assert.Throws(typeof(ArgumentNullException), () => impl.ClearStatus(null, ""));
            Assert.Throws(typeof(ArgumentNullException), () => impl.ClearStatus("", null));
        }

        private static HealthCheckResponse.Types.ServingStatus GetStatusHelper(HealthServiceImpl impl, string host, string service)
        {
            return impl.Check(new HealthCheckRequest { Host = host, Service = service }, null).Result.Status;
        }
    }
}