#region Copyright notice and license

// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#endregion

using System;
using System.Collections.Generic;
using System.Threading;
using Grpc.Core;
using Grpc.Core.Internal;
using Grpc.Core.Utils;
using NUnit.Framework;

namespace Grpc.Core.Tests
{
    public class CallOptionsTest
    {
        [Test]
        public void WithMethods()
        {
            var options = new CallOptions();
            
            var metadata = new Metadata();
            Assert.AreSame(metadata, options.WithHeaders(metadata).Headers);

            var deadline = DateTime.UtcNow;
            Assert.AreEqual(deadline, options.WithDeadline(deadline).Deadline.Value);

            var cancellationToken = new CancellationTokenSource().Token;
            Assert.AreEqual(cancellationToken, options.WithCancellationToken(cancellationToken).CancellationToken);

            var writeOptions = new WriteOptions();
            Assert.AreSame(writeOptions, options.WithWriteOptions(writeOptions).WriteOptions);

            var propagationToken = new ContextPropagationToken(CallSafeHandle.NullInstance, DateTime.UtcNow, 
                CancellationToken.None, ContextPropagationOptions.Default);
            Assert.AreSame(propagationToken, options.WithPropagationToken(propagationToken).PropagationToken);

            var credentials = new FakeCallCredentials();
            Assert.AreSame(credentials, options.WithCredentials(credentials).Credentials);

            var flags = CallFlags.WaitForReady | CallFlags.CacheableRequest;
            Assert.AreEqual(flags, options.WithFlags(flags).Flags);

            // Check that the original instance is unchanged.
            Assert.IsNull(options.Headers);
            Assert.IsNull(options.Deadline);
            Assert.AreEqual(CancellationToken.None, options.CancellationToken);
            Assert.IsNull(options.WriteOptions);
            Assert.IsNull(options.PropagationToken);
            Assert.IsNull(options.Credentials);
            Assert.AreEqual(default(CallFlags), options.Flags);
        }

        [Test]
        public void Normalize()
        {
            Assert.AreSame(Metadata.Empty, new CallOptions().Normalize().Headers);
            Assert.AreEqual(DateTime.MaxValue, new CallOptions().Normalize().Deadline.Value);

            var deadline = DateTime.UtcNow;
            var propagationToken1 = new ContextPropagationToken(CallSafeHandle.NullInstance, deadline, CancellationToken.None,
                new ContextPropagationOptions(propagateDeadline: true, propagateCancellation: false));
            Assert.AreEqual(deadline, new CallOptions(propagationToken: propagationToken1).Normalize().Deadline.Value);
            Assert.Throws(typeof(ArgumentException), () => new CallOptions(deadline: deadline, propagationToken: propagationToken1).Normalize());

            var token = new CancellationTokenSource().Token;
            var propagationToken2 = new ContextPropagationToken(CallSafeHandle.NullInstance, deadline, token,
                new ContextPropagationOptions(propagateDeadline: false, propagateCancellation: true));
            Assert.AreEqual(token, new CallOptions(propagationToken: propagationToken2).Normalize().CancellationToken);
            Assert.Throws(typeof(ArgumentException), () => new CallOptions(cancellationToken: token, propagationToken: propagationToken2).Normalize());
        }

        [Test]
        public void WaitForReady()
        {
            var callOptions = new CallOptions();
            Assert.IsFalse(callOptions.IsWaitForReady);

            Assert.AreEqual(CallFlags.WaitForReady, callOptions.WithWaitForReady().Flags);
            Assert.IsTrue(callOptions.WithWaitForReady().IsWaitForReady);
            Assert.IsFalse(callOptions.WithWaitForReady(true).WithWaitForReady(false).IsWaitForReady);
        }
    }
}