// Copyright (c) .NET Foundation. 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.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;
using Microsoft.Extensions.Primitives;
using Xunit;

namespace Microsoft.AspNetCore.Mvc.IntegrationTests
{
    public class BindingSourceMetadataProviderIntegrationTest
    {
        [Fact]
        public async Task BindParameter_WithCancellationToken_BindingSourceSpecial()
        {
            // Arrange
            var options = new MvcOptions();
            var setup = new MvcCoreMvcOptionsSetup(new TestHttpRequestStreamReaderFactory());

            options.ModelBinderProviders.Insert(0, new CancellationTokenModelBinderProvider());

            setup.Configure(options);

            var parameterBinder = ModelBindingTestHelper.GetParameterBinder(options);
            var parameter = new ParameterDescriptor()
            {
                Name = "Parameter1",
                BindingInfo = new BindingInfo(),
                ParameterType = typeof(CancellationTokenBundle),
            };

            var testContext = ModelBindingTestHelper.GetTestContext(request =>
            {
                request.Form = new FormCollection(new Dictionary<string, StringValues>
                {
                    { "name", new[] { "Fred" } }
                });
            });

            var modelState = testContext.ModelState;
            var token = testContext.HttpContext.RequestAborted;

            // Act
            var modelBindingResult = await parameterBinder.BindModelAsync(parameter, testContext);

            // Assert
            // ModelBindingResult
            Assert.True(modelBindingResult.IsModelSet);

            // Model
            var boundPerson = Assert.IsType<CancellationTokenBundle>(modelBindingResult.Model);
            Assert.NotNull(boundPerson);
            Assert.Equal("Fred", boundPerson.Name);
            Assert.Equal(token, boundPerson.Token);

            // ModelState
            Assert.True(modelState.IsValid);
        }

        private class CancellationTokenBundle
        {
            public string Name { get; set; }

            public CancellationToken Token { get; set; }
        }

        [Fact]
        public async Task BindParameter_WithFormFile_BindingSourceFormFile()
        {
            // Arrange
            var options = new MvcOptions();
            var setup = new MvcCoreMvcOptionsSetup(new TestHttpRequestStreamReaderFactory());

            options.ModelBinderProviders.Insert(0, new FormFileModelBinderProvider());

            setup.Configure(options);

            var parameterBinder = ModelBindingTestHelper.GetParameterBinder(options);
            var parameter = new ParameterDescriptor()
            {
                Name = "Parameter1",
                BindingInfo = new BindingInfo(),
                ParameterType = typeof(FormFileBundle),
            };

            var data = "Some Data Is Better Than No Data.";
            var testContext = ModelBindingTestHelper.GetTestContext(
                request =>
                {
                    request.QueryString = QueryString.Create("Name", "Fred");
                    UpdateRequest(request, data, "File");
                });

            var modelState = testContext.ModelState;

            // Act
            var modelBindingResult = await parameterBinder.BindModelAsync(parameter, testContext);

            // Assert
            // ModelBindingResult
            Assert.True(modelBindingResult.IsModelSet);

            // Model
            var boundPerson = Assert.IsType<FormFileBundle>(modelBindingResult.Model);
            Assert.Equal("Fred", boundPerson.Name);
            Assert.Equal("text.txt", boundPerson.File.FileName);

            // ModelState
            Assert.True(modelState.IsValid);
        }

        private class FormFileBundle
        {
            public string Name { get; set; }

            public IFormFile File { get; set; }
        }

        private void UpdateRequest(HttpRequest request, string data, string name)
        {
            const string fileName = "text.txt";
            var fileCollection = new FormFileCollection();
            var formCollection = new FormCollection(new Dictionary<string, StringValues>(), fileCollection);

            request.Form = formCollection;
            request.ContentType = "multipart/form-data; boundary=----WebKitFormBoundarymx2fSWqWSd0OxQqq";

            if (string.IsNullOrEmpty(data) || string.IsNullOrEmpty(name))
            {
                // Leave the submission empty.
                return;
            }

            request.Headers["Content-Disposition"] = $"form-data; name={name}; filename={fileName}";

            var memoryStream = new MemoryStream(Encoding.UTF8.GetBytes(data));
            fileCollection.Add(new FormFile(memoryStream, 0, data.Length, name, fileName)
            {
                Headers = request.Headers
            });
        }
    }
}
