// 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;
using System.Linq;
using System.Reflection;
using Microsoft.AspNetCore.Http.Features;
using Xunit;

namespace Microsoft.AspNetCore.Mvc
{
    public class RequestFormLimitsAttributeTest
    {
        [Fact]
        public void AllPublicProperties_OfFormOptions_AreExposed()
        {
            // Arrange
            var formOptionsProperties = GetProperties(typeof(FormOptions));
            var formLimitsAttributeProperties = GetProperties(typeof(RequestFormLimitsAttribute));

            // Act & Assert
            foreach (var property in formOptionsProperties)
            {
                var formLimitAttributeProperty = formLimitsAttributeProperties
                    .Where(pi => property.Name == pi.Name && pi.PropertyType == property.PropertyType)
                    .SingleOrDefault();
                Assert.NotNull(formLimitAttributeProperty);
            }
        }

        [Fact]
        public void CreatesFormOptions_WithDefaults()
        {
            // Arrange
            var formOptionsProperties = GetProperties(typeof(FormOptions));
            var formLimitsAttributeProperties = GetProperties(typeof(RequestFormLimitsAttribute));
            var formOptions = new FormOptions();

            // Act
            var requestFormLimitsAttribute = new RequestFormLimitsAttribute();

            // Assert
            foreach (var formOptionsProperty in formOptionsProperties)
            {
                var formLimitsAttributeProperty = formLimitsAttributeProperties
                    .Where(pi => pi.Name == formOptionsProperty.Name && pi.PropertyType == formOptionsProperty.PropertyType)
                    .SingleOrDefault();

                Assert.Equal(
                    formOptionsProperty.GetValue(formOptions),
                    formLimitsAttributeProperty.GetValue(requestFormLimitsAttribute));
            }
        }

        [Fact]
        public void UpdatesFormOptions_WithOverridenValues()
        {
            // Arrange
            var requestFormLimitsAttribute = new RequestFormLimitsAttribute();

            // Act
            requestFormLimitsAttribute.BufferBody = true;
            requestFormLimitsAttribute.BufferBodyLengthLimit = 0;
            requestFormLimitsAttribute.KeyLengthLimit = 0;
            requestFormLimitsAttribute.MemoryBufferThreshold = 0;
            requestFormLimitsAttribute.MultipartBodyLengthLimit = 0;
            requestFormLimitsAttribute.MultipartBoundaryLengthLimit = 0;
            requestFormLimitsAttribute.MultipartHeadersCountLimit = 0;
            requestFormLimitsAttribute.MultipartHeadersLengthLimit = 0;
            requestFormLimitsAttribute.ValueCountLimit = 0;
            requestFormLimitsAttribute.ValueLengthLimit = 0;

            // Assert
            Assert.True(requestFormLimitsAttribute.FormOptions.BufferBody);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.BufferBodyLengthLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.KeyLengthLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.MemoryBufferThreshold);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.MultipartBodyLengthLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.MultipartBoundaryLengthLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.MultipartHeadersCountLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.MultipartHeadersLengthLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.ValueCountLimit);
            Assert.Equal(0, requestFormLimitsAttribute.FormOptions.ValueLengthLimit);
        }

        private PropertyInfo[] GetProperties(Type type)
        {
            return type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
        }
    }
}