// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNet.Http;
using Microsoft.AspNet.Http.Core;
using Microsoft.AspNet.Routing;
using Microsoft.AspNet.WebUtilities;
using Microsoft.Framework.OptionsModel;
using Moq;
using Xunit;

namespace Microsoft.AspNet.Mvc
{
    public class CreatedResultTests
    {
        [Fact]
        public void CreatedResult_SetsLocation()
        {
            // Arrange
            var location = "http://test/location";

            // Act
            var result = new CreatedResult(location, "testInput");

            // Assert
            Assert.Same(location, result.Location);
        }

        [Fact]
        public async Task CreatedResult_ReturnsStatusCode_SetsLocationHeader()
        {
            // Arrange
            var location = "/test/";
            var httpContext = GetHttpContext();
            var actionContext = GetActionContext(httpContext);
            var result = new CreatedResult(location, "testInput");

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            Assert.Equal(StatusCodes.Status201Created, httpContext.Response.StatusCode);
            Assert.Equal(location, httpContext.Response.Headers["Location"]);
        }

        [Fact]
        public async Task CreatedResult_OverwritesLocationHeader()
        {
            // Arrange
            var location = "/test/";
            var httpContext = GetHttpContext();
            var actionContext = GetActionContext(httpContext);
            httpContext.Response.Headers.Set("Location", "/different/location/");
            var result = new CreatedResult(location, "testInput");

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            Assert.Equal(StatusCodes.Status201Created, httpContext.Response.StatusCode);
            Assert.Equal(location, httpContext.Response.Headers["Location"]);
        }

        private static ActionContext GetActionContext(HttpContext httpContext)
        {
            var routeData = new RouteData();
            routeData.Routers.Add(Mock.Of<IRouter>());

            return new ActionContext(httpContext,
                                    routeData,
                                    new ActionDescriptor());
        }

        private static HttpContext GetHttpContext()
        {
            var httpContext = new Mock<HttpContext>();
            var realContext = new DefaultHttpContext();
            var request = realContext.Request;
            request.PathBase = new PathString("");
            var response = realContext.Response;
            response.Body = new MemoryStream();

            httpContext.Setup(o => o.Request)
                       .Returns(request);
            httpContext.Setup(o => o.Response)
                       .Returns(response);
            httpContext.Setup(o => o.RequestServices.GetService(typeof(IOutputFormattersProvider)))
                       .Returns(new TestOutputFormatterProvider());
            var options = new Mock<IOptions<MvcOptions>>();
            options.SetupGet(o => o.Options)
                       .Returns(new MvcOptions());
            httpContext.Setup(o => o.RequestServices.GetService(typeof(IOptions<MvcOptions>)))
                                   .Returns(options.Object);
            return httpContext.Object;
        }

        private class TestOutputFormatterProvider : IOutputFormattersProvider
        {
            public IReadOnlyList<IOutputFormatter> OutputFormatters
            {
                get
                {
                    return new List<IOutputFormatter>()
                            {
                                new StringOutputFormatter(),
                                new JsonOutputFormatter()
                            };
                }
            }
        }
    }
}