// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.

using System.Net.Mime;
using System.Web.TestUtil;
using Moq;
using Xunit;
using Assert = Microsoft.TestCommon.AssertEx;

namespace System.Web.Mvc.Test
{
    public class FileResultTest
    {
        [Fact]
        public void ConstructorSetsContentTypeProperty()
        {
            // Act
            FileResult result = new EmptyFileResult("someContentType");

            // Assert
            Assert.Equal("someContentType", result.ContentType);
        }

        [Fact]
        public void ConstructorThrowsIfContentTypeIsEmpty()
        {
            // Act & assert
            Assert.ThrowsArgumentNullOrEmpty(
                delegate { new EmptyFileResult(String.Empty); }, "contentType");
        }

        [Fact]
        public void ConstructorThrowsIfContentTypeIsNull()
        {
            // Act & assert
            Assert.ThrowsArgumentNullOrEmpty(
                delegate { new EmptyFileResult(null); }, "contentType");
        }

        [Fact]
        public void ContentDispositionHeaderIsEncodedCorrectly()
        {
            // See comment in FileResult.cs detailing how the FileDownloadName should be encoded.

            // Arrange
            Mock<ControllerContext> mockControllerContext = new Mock<ControllerContext>(MockBehavior.Strict);
            mockControllerContext.SetupSet(c => c.HttpContext.Response.ContentType = "application/my-type").Verifiable();
            mockControllerContext.Setup(c => c.HttpContext.Response.AddHeader("Content-Disposition", @"attachment; filename=""some\\file""")).Verifiable();

            EmptyFileResult result = new EmptyFileResult("application/my-type")
            {
                FileDownloadName = @"some\file"
            };

            // Act
            result.ExecuteResult(mockControllerContext.Object);

            // Assert
            Assert.True(result.WasWriteFileCalled);
            mockControllerContext.Verify();
        }

        [Fact(Skip="Pending fix to DevDiv 356181 -- 4.5 changed ContentDisposition.ToString()")]
        public void ContentDispositionHeaderIsEncodedCorrectlyForUnicodeCharacters()
        {
            // Arrange
            Mock<ControllerContext> mockControllerContext = new Mock<ControllerContext>(MockBehavior.Strict);
            mockControllerContext.SetupSet(c => c.HttpContext.Response.ContentType = "application/my-type").Verifiable();
            mockControllerContext.Setup(c => c.HttpContext.Response.AddHeader("Content-Disposition", @"attachment; filename*=UTF-8''ABCXYZabcxyz012789!%40%23$%25%5E&%2A%28%29-%3D_+.:~%CE%94")).Verifiable();

            EmptyFileResult result = new EmptyFileResult("application/my-type")
            {
                FileDownloadName = "ABCXYZabcxyz012789!@#$%^&*()-=_+.:~Δ"
            };

            // Act
            result.ExecuteResult(mockControllerContext.Object);

            // Assert
            Assert.True(result.WasWriteFileCalled);
            mockControllerContext.Verify();
        }

        [Fact]
        public void ExecuteResultDoesNotSetContentDispositionIfNotSpecified()
        {
            // Arrange
            Mock<ControllerContext> mockControllerContext = new Mock<ControllerContext>();
            mockControllerContext.SetupSet(c => c.HttpContext.Response.ContentType = "application/my-type").Verifiable();

            EmptyFileResult result = new EmptyFileResult("application/my-type");

            // Act
            result.ExecuteResult(mockControllerContext.Object);

            // Assert
            Assert.True(result.WasWriteFileCalled);
            mockControllerContext.Verify();
        }

        [Fact]
        public void ExecuteResultSetsContentDispositionIfSpecified()
        {
            // Arrange
            Mock<ControllerContext> mockControllerContext = new Mock<ControllerContext>(MockBehavior.Strict);
            mockControllerContext.SetupSet(c => c.HttpContext.Response.ContentType = "application/my-type").Verifiable();
            mockControllerContext.Setup(c => c.HttpContext.Response.AddHeader("Content-Disposition", "attachment; filename=filename.ext")).Verifiable();

            EmptyFileResult result = new EmptyFileResult("application/my-type")
            {
                FileDownloadName = "filename.ext"
            };

            // Act
            result.ExecuteResult(mockControllerContext.Object);

            // Assert
            Assert.True(result.WasWriteFileCalled);
            mockControllerContext.Verify();
        }

        [Fact]
        public void ExecuteResultThrowsIfContextIsNull()
        {
            // Arrange
            FileResult result = new EmptyFileResult();

            // Act & assert
            Assert.ThrowsArgumentNull(
                delegate { result.ExecuteResult(null); }, "context");
        }

        [Fact]
        public void FileDownloadNameProperty()
        {
            // Arrange
            FileResult result = new EmptyFileResult();

            // Act & assert
            MemberHelper.TestStringProperty(result, "FileDownloadName", String.Empty);
        }

        private class EmptyFileResult : FileResult
        {
            public bool WasWriteFileCalled;

            public EmptyFileResult()
                : this(MediaTypeNames.Application.Octet)
            {
            }

            public EmptyFileResult(string contentType)
                : base(contentType)
            {
            }

            protected override void WriteFile(HttpResponseBase response)
            {
                WasWriteFileCalled = true;
            }
        }
    }
}