// Copyright (C) Stichting Deltares 2017. All rights reserved.
//
// This file is part of Ringtoets.
//
// Ringtoets is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using System.ComponentModel;
using Core.Common.Utils.Attributes;
using Core.Common.Utils.Test.Properties;
using NUnit.Framework;
using Rhino.Mocks;

namespace Core.Common.Utils.Test
{
    [TestFixture]
    public class NullableEnumConverterTest
    {
        [Test]
        public void DefaultConstructor_ExpectedValues()
        {
            // Call
            Type nullableType = typeof(SimpleEnum?);
            var converter = new NullableEnumConverter(nullableType);

            // Assert
            Assert.IsInstanceOf<NullableConverter>(converter);
            Assert.AreEqual(nullableType, converter.NullableType);
            Assert.AreEqual(typeof(SimpleEnum), converter.UnderlyingType);
        }

        [Test]
        public void CanConvertTo_DestinationTypeIsInvalid_ReturnsFalse()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            bool canConvert = converter.CanConvertTo(typeof(NotSupportedType));

            // Assert
            Assert.IsFalse(canConvert);
        }

        [Test]
        public void CanConvertTo_DestinationTypeIsString_ReturnsTrue()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            bool canConvert = converter.CanConvertTo(typeof(string));

            // Assert
            Assert.IsTrue(canConvert);
        }

        [Test]
        public void ConvertTo_ValueIsOfInvalidType_ThrowsNotSupportedException()
        {
            // Setup
            var notSupportedValue = new NotSupportedType();
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TestDelegate test = () => converter.ConvertTo(notSupportedValue, typeof(SimpleEnum));

            // Assert
            Assert.Throws<NotSupportedException>(test);
        }

        [Test]
        public void ConvertTo_ValueIsNull_DoesNotThrowException()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            var result = new object();
            TestDelegate test = () => result = converter.ConvertTo(null, typeof(string));

            // Assert
            Assert.DoesNotThrow(test);
            Assert.AreEqual(string.Empty, result);
        }

        [Test]
        public void ConvertTo_DestinationTypeIsNull_ThrowsArgumentNullException()
        {
            // Setup
            const SimpleEnum enumValue = SimpleEnum.FirstValue;
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TestDelegate test = () => converter.ConvertTo(enumValue, null);

            // Assert
            Assert.Throws<ArgumentNullException>(test);
        }

        [Test]
        public void ConvertTo_DestinationTypeIsInvalid_ThrowsNotSupportedException()
        {
            // Setup
            const SimpleEnum enumValue = SimpleEnum.FirstValue;
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TestDelegate test = () => converter.ConvertTo(enumValue, typeof(NotSupportedType));

            // Assert
            Assert.Throws<NotSupportedException>(test);
        }

        [Test]
        public void ConvertTo_DestinationTypeIsString_ReturnsExpectedEnumDisplayName()
        {
            // Setup
            const SimpleEnum enumValue = SimpleEnum.FirstValue;
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            object result = converter.ConvertTo(enumValue, typeof(string));

            // Assert
            const string expectedText = "<first>";
            Assert.AreEqual(expectedText, result);
        }

        [Test]
        public void CanConvertFrom_SourceTypeIsInvalid_ReturnsFalse()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            bool canConvert = converter.CanConvertFrom(typeof(NotSupportedType));

            // Assert
            Assert.IsFalse(canConvert);
        }

        [Test]
        public void CanConvertFrom_SourceTypeIsString_ReturnsTrue()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            bool canConvert = converter.CanConvertFrom(typeof(string));

            // Assert
            Assert.IsTrue(canConvert);
        }

        [Test]
        public void ConvertFrom_ValueIsOfInvalidType_ThrowsNotSupportedException()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TestDelegate test = () => converter.ConvertFrom(typeof(NotSupportedType));

            // Assert
            Assert.Throws<NotSupportedException>(test);
        }

        [Test]
        public void ConvertFrom_ValueIsNull_ThrowsNotSupportedException()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TestDelegate test = () => converter.ConvertFrom(null);

            // Assert
            Assert.Throws<NotSupportedException>(test);
        }

        [Test]
        public void ConvertFrom_ValueIsString_ReturnsExpectedEnum()
        {
            // Setup
            const string second = "<second>";
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            object result = converter.ConvertFrom(second);

            // Assert
            const SimpleEnum expectedEnumValue = SimpleEnum.SecondValue;
            Assert.AreEqual(expectedEnumValue, result);
        }

        [Test]
        public void GetStandardValues_ITypeDescriptorContextIsNull_ReturnEnumValues()
        {
            // Setup
            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TypeConverter.StandardValuesCollection result = converter.GetStandardValues(null);

            // Assert
            Assert.IsNotNull(result);
            Assert.AreEqual(2, result.Count);
            Assert.AreEqual(SimpleEnum.FirstValue, result[0]);
            Assert.AreEqual(SimpleEnum.SecondValue, result[1]);
        }

        [Test]
        public void GetStandardValues_ITypeDescriptorContext_ReturnEnumValues()
        {
            // Setup
            var mockRepository = new MockRepository();
            var typeDescriptorContext= mockRepository.Stub<ITypeDescriptorContext>();
            mockRepository.ReplayAll();

            var converter = new NullableEnumConverter(typeof(SimpleEnum?));

            // Call
            TypeConverter.StandardValuesCollection result = converter.GetStandardValues(typeDescriptorContext);

            // Assert
            Assert.IsNotNull(result);
            Assert.AreEqual(2, result.Count);
            Assert.AreEqual(SimpleEnum.FirstValue, result[0]);
            Assert.AreEqual(SimpleEnum.SecondValue, result[1]);
            mockRepository.VerifyAll();
        }

        private enum SimpleEnum
        {
            [ResourcesDisplayName(typeof(Resources), nameof(Resources.SimpleEnum_FirstValue_DisplayName))]
            FirstValue,

            [ResourcesDisplayName(typeof(Resources), nameof(Resources.SimpleEnum_SecondValue_DisplayName))]
            SecondValue
        }

        private class NotSupportedType {}
    }
}