// 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 Microsoft.Extensions.Primitives;
using Xunit;

namespace Microsoft.AspNetCore.Mvc.ModelBinding
{
    public class ValueProviderResultTest
    {
        [Fact]
        public void Construct_With_NullString()
        {
            // Arrange & Act
            var result = new ValueProviderResult((string)null);

            // Assert
            Assert.Equal(0, result.Length);
            Assert.Empty(result.Values);
            Assert.Null(result.FirstValue);
            Assert.Equal(ValueProviderResult.None, result);
            Assert.Null((string)result);
            Assert.Null((string[])result);
        }

        [Fact]
        public void Construct_With_NullArray()
        {
            // Arrange & Act
            var result = new ValueProviderResult((string[])null);

            // Assert
            Assert.Equal(0, result.Length);
            Assert.Empty(result.Values);
            Assert.Null(result.FirstValue);
            Assert.Equal(ValueProviderResult.None, result);
            Assert.Null((string)result);
            Assert.Null((string[])result);
        }

        [Fact]
        public void Construct_With_None()
        {
            // Arrange & Act
            var result = ValueProviderResult.None;

            // Assert
            Assert.Equal(0, result.Length);
            Assert.Empty(result.Values);
            Assert.Null(result.FirstValue);
            Assert.Equal(ValueProviderResult.None, result);
            Assert.Equal(ValueProviderResult.None, new ValueProviderResult(new StringValues()));
            Assert.Null((string)result);
            Assert.Empty((string[])result);
        }

        [Fact]
        public void Construct_With_String()
        {
            // Arrange & Act
            var result = new ValueProviderResult("Hi There");

            // Assert
            Assert.Equal(1, result.Length);
            Assert.Equal("Hi There", result.Values);
            Assert.Equal("Hi There", result.FirstValue);
            Assert.NotEqual(ValueProviderResult.None, result);
            Assert.Equal("Hi There", (string)result);
            Assert.Equal(new string[] { "Hi There" }, (string[])result);
        }

        [Fact]
        public void Construct_With_Array()
        {
            // Arrange & Act
            var result = new ValueProviderResult(new string[] { "Hi", "There" });

            // Assert
            Assert.Equal(2, result.Length);
            Assert.Equal(new string[] { "Hi", "There" }, result.Values);
            Assert.Equal("Hi", result.FirstValue);
            Assert.NotEqual(ValueProviderResult.None, result);
            Assert.Equal("Hi,There", (string)result);
            Assert.Equal(new string[] { "Hi", "There" }, (string[])result);
        }

        [Fact]
        public void Enumerator_WithString()
        {
            // Arrange
            var result = new ValueProviderResult("Hi There");

            // Act & Assert
            Assert.Equal<string>(new string[] { "Hi There", }, result);
        }

        [Fact]
        public void Enumerator_WithArray()
        {
            // Arrange
            var result = new ValueProviderResult(new string[] { "Hi", "There" });

            // Act & Assert
            Assert.Equal<string>(new string[] { "Hi", "There" }, result);
        }

        public static TheoryData<ValueProviderResult, ValueProviderResult, bool> EqualsData
        {
            get
            {
                return new TheoryData<ValueProviderResult, ValueProviderResult, bool>()
                {
                    {
                        new ValueProviderResult("Hi"),
                        new ValueProviderResult("Hi"),
                        true
                    },
                    {
                        new ValueProviderResult("Hi"),
                        new ValueProviderResult(new string[] { "Hi"}),
                        true
                    },
                    {
                        new ValueProviderResult(new string[] { "Hi"}),
                        new ValueProviderResult("Hi"),
                        true
                    },
                    {
                        new ValueProviderResult(new string[] { "Hi"}),
                        new ValueProviderResult(new string[] { "Hi"}),
                        true
                    },
                    {
                        new ValueProviderResult(new string[] { "Hi", "There"}),
                        new ValueProviderResult(new string[] { "Hi", "There"}),
                        true
                    },
                    {
                        new ValueProviderResult("Hi,There"),
                        new ValueProviderResult(new string[] { "Hi", "There"}),
                        false
                    },
                    {
                        new ValueProviderResult(new string[] { "Hi", string.Empty }),
                        new ValueProviderResult(new string[] { "Hi", "There"}),
                        false
                    },
                    {
                        new ValueProviderResult(new string[] { "Hi", "There" }),
                        new ValueProviderResult(new string[] { "Hi", "ThEre"}),
                        false
                    },
                    {
                        new ValueProviderResult(new string[] { "Hi", }),
                        new ValueProviderResult(new string[] { "Hi", string.Empty }),
                        false
                    },
                    {
                        new ValueProviderResult(),
                        new ValueProviderResult((string)null),
                        true
                    },
                    {
                        new ValueProviderResult(),
                        new ValueProviderResult("hi"),
                        false
                    },
                };
            }
        }

        [Theory]
        [MemberData(nameof(EqualsData))]
        public void Operator_Equals(ValueProviderResult x, ValueProviderResult y, bool expected)
        {
            // Arrange
            var result = x == y;

            // Act & Assert
            Assert.Equal(expected, result);
        }

        [Theory]
        [MemberData(nameof(EqualsData))]
        public void Operator_NotEquals(ValueProviderResult x, ValueProviderResult y, bool expected)
        {
            // Arrange
            var result = x != y;

            // Act & Assert
            Assert.NotEqual(expected, result);
        }
    }
}
