﻿/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace DotPulsar.Tests.Internal.Extensions
{
    using DotPulsar.Internal;
    using DotPulsar.Internal.Extensions;
    using FluentAssertions;
    using Xunit;

    public class ReadOnlySequenceExtensionsTests
    {
        [Fact]
        public void StartsWith_GivenToShortSequenceWithSingleSegment_ShouldReturnFalse()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00 }).Build();

            //Act
            var actual = sequence.StartsWith(new byte[] { 0x00, 0x01 });

            //Assert
            actual.Should().BeFalse();
        }

        [Fact]
        public void StartsWith_GivenSequenceWithSingleSegment_ShouldReturnFalse()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00, 0x02, 0x01 }).Build();

            //Act
            var actual = sequence.StartsWith(new byte[] { 0x00, 0x01 });

            //Assert
            actual.Should().BeFalse();
        }

        [Fact]
        public void StartsWith_GivenSequenceWithSingleSegment_ShouldReturnTrue()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00, 0x01, 0x02 }).Build();

            //Act
            var actual = sequence.StartsWith(new byte[] { 0x00, 0x01 });

            //Assert
            actual.Should().BeTrue();
        }

        [Fact]
        public void StartsWith_GivenToShortSequenceWithMultipleSegments_ShouldReturnFalse()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00, 0x01 }).Append(new byte[] { 0x02 }).Build();

            //Act
            var actual = sequence.StartsWith(new byte[] { 0x00, 0x01, 0x02, 0x03 });

            //Assert
            actual.Should().BeFalse();
        }

        [Fact]
        public void StartsWith_GivenSequenceWithMultipleSegments_ShouldReturnFalse()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00, 0x02 }).Append(new byte[] { 0x01, 0x03 }).Build();

            //Act
            var actual = sequence.StartsWith(new byte[] { 0x00, 0x01, 0x02 });

            //Assert
            actual.Should().BeFalse();
        }

        [Fact]
        public void StartsWith_GivenSequenceWithMultipleSegments_ShouldReturnTrue()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00, 0x01 }).Append(new byte[] { 0x02, 0x03 }).Build();

            //Act
            var actual = sequence.StartsWith(new byte[] { 0x00, 0x01, 0x02 });

            //Assert
            actual.Should().BeTrue();
        }

        [Fact]
        public void ReadUInt32_GivenSequenceWithSingleSegment_ShouldGiveExceptedResult()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x00, 0x01, 0x02, 0x03 }).Build();

            //Act
            var actual = sequence.ReadUInt32(0, true);

            //Assert
            const uint expected = 66051;
            actual.Should().Be(expected);
        }

        [Fact]
        public void ReadUInt32_GivenSequenceWithSingleSegmentAndNonZeroStart_ShouldGiveExceptedResult()
        {
            //Arrange
            var sequence = new SequenceBuilder<byte>().Append(new byte[] { 0x09, 0x00, 0x01, 0x02, 0x03 }).Build();

            //Act
            var actual = sequence.ReadUInt32(1, true);

            //Assert
            const uint expected = 66051;
            actual.Should().Be(expected);
        }

#pragma warning disable xUnit1025 // Miscoded warning can't tell these are all different
        [Theory]
        [InlineData(new byte[] { }, new byte[] { 0x02, 0x03, 0x04, 0x05 })]
        [InlineData(new byte[] { 0x02 }, new byte[] { 0x03, 0x04, 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03 }, new byte[] { 0x04, 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03, 0x04 }, new byte[] { 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03, 0x04, 0x05 }, new byte[] { })]
        [InlineData(new byte[] { 0x02 }, new byte[] { }, new byte[] { 0x03, 0x04, 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03 }, new byte[] { }, new byte[] { 0x04, 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03, 0x04 }, new byte[] { }, new byte[] { 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03 }, new byte[] { 0x04 }, new byte[] { 0x05 })]
        [InlineData(new byte[] { 0x02 }, new byte[] { 0x03, 0x04 }, new byte[] { 0x05 })]
        [InlineData(new byte[] { 0x02 }, new byte[] { 0x03 }, new byte[] { 0x04, 0x05 })]
        [InlineData(new byte[] { 0x02 }, new byte[] { 0x03 }, new byte[] { 0x04 }, new byte[] { 0x05 })]
        [InlineData(new byte[] { 0x02, 0x03, 0x04 }, new byte[] { 0x05, 0x09 })]
        [InlineData(new byte[] { 0x02 }, new byte[] { 0x03, 0x04, 0x05 }, new byte[] { 0x09 })]
        [InlineData(new byte[] { 0x02 }, new byte[] { 0x03 }, new byte[] { 0x04, 0x05 }, new byte[] { 0x09 })]
#pragma warning restore xUnit1025 // InlineData should be unique within the Theory it belongs to
        public void ReadUInt32_GivenSequenceWithMultipleSegments_ShouldGiveExceptedResult(params byte[][] testPath)
        {
            //Arrange
            var sequenceBuilder = new SequenceBuilder<byte>();
            foreach (var array in testPath)
                sequenceBuilder.Append(array);
            var sequence = sequenceBuilder.Build();

            //Act
            var actual = sequence.ReadUInt32(0, true);

            //Assert
            const uint expected = 0x02030405;
            actual.Should().Be(expected);
        }

        [Theory]
        [InlineData(2, new byte[] { 0x09, 0x09, 0x02 }, new byte[] { 0x03, 0x04, 0x05 }, new byte[] { 0x09, 0x09, 0x09 })]
        [InlineData(3, new byte[] { 0x09, 0x09, 0x09 }, new byte[] { 0x02, 0x03, 0x04 }, new byte[] { 0x05, 0x09, 0x09 })]
        [InlineData(4, new byte[] { 0x09, 0x09, 0x09 }, new byte[] { 0x09, 0x02, 0x03 }, new byte[] { 0x04, 0x05, 0x09 })]
        public void ReadUInt32_GivenSequenceWithMultipleSegmentsAndNonZeroStart_ShouldGiveExceptedResult(long start, params byte[][] testPath)
        {
            //Arrange
            var sequenceBuilder = new SequenceBuilder<byte>();
            foreach (var array in testPath)
                sequenceBuilder.Append(array);
            var sequence = sequenceBuilder.Build();

            //Act
            var actual = sequence.ReadUInt32(start, true);

            //Assert
            const uint expected = 0x02030405;
            actual.Should().Be(expected);
        }
    }
}