/* ========================================================================
 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Text;
using Microsoft.Extensions.Logging.Abstractions;
using NUnit.Framework;

namespace Opc.Ua.SourceGeneration.Tests
{
    [TestFixture]
    [Category("SourceGeneration")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    public class ExtensionsTests
    {
        [Test]
        public void GetBoolReturnsTrueWhenValueIsTrue()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyFlag".ToLowerInvariant()] = "true"
            });

            bool result = options.GetBool("MyFlag");

            Assert.That(result, Is.True);
        }

        [Test]
        public void GetBoolReturnsTrueWhenValueIsTrueCaseInsensitive()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyFlag".ToLowerInvariant()] = "True"
            });

            bool result = options.GetBool("MyFlag");

            Assert.That(result, Is.True);
        }

        [Test]
        public void GetBoolReturnsFalseWhenValueIsFalse()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyFlag".ToLowerInvariant()] = "false"
            });

            bool result = options.GetBool("MyFlag");

            Assert.That(result, Is.False);
        }

        [Test]
        public void GetBoolReturnsFalseWhenKeyMissing()
        {
            var options = new AnalyzerOptions([]);

            bool result = options.GetBool("NonExistent");

            Assert.That(result, Is.False);
        }

        [Test]
        public void GetStringReturnsValueWhenPresent()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyString".ToLowerInvariant()] = "hello"
            });

            string result = options.GetString("MyString");

            Assert.That(result, Is.EqualTo("hello"));
        }

        [Test]
        public void GetStringReturnsEmptyStringWhenKeyMissing()
        {
            var options = new AnalyzerOptions([]);

            string result = options.GetString("NonExistent");

            Assert.That(result, Is.EqualTo(string.Empty));
        }

        [Test]
        public void GetIntegerReturnsValueWhenPresent()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyInt".ToLowerInvariant()] = "42"
            });

            int result = options.GetInteger("MyInt");

            Assert.That(result, Is.EqualTo(42));
        }

        [Test]
        public void GetIntegerReturnsZeroWhenKeyMissing()
        {
            var options = new AnalyzerOptions([]);

            int result = options.GetInteger("NonExistent");

            Assert.That(result, Is.Zero);
        }

        [Test]
        public void GetIntegerReturnsZeroWhenValueIsNotANumber()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyInt".ToLowerInvariant()] = "notanumber"
            });

            int result = options.GetInteger("MyInt");

            Assert.That(result, Is.Zero);
        }

        [Test]
        public void GetStringsSplitsSemicolonDelimited()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyList".ToLowerInvariant()] = "a;b;c"
            });

            IReadOnlyList<string> result = options.GetStrings("MyList");

            Assert.That(result, Has.Count.EqualTo(3));
            Assert.That(result, Does.Contain("a"));
            Assert.That(result, Does.Contain("b"));
            Assert.That(result, Does.Contain("c"));
        }

        [Test]
        public void GetStringsSplitsCommaDelimited()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyList".ToLowerInvariant()] = "x,y,z"
            });

            IReadOnlyList<string> result = options.GetStrings("MyList");

            Assert.That(result, Has.Count.EqualTo(3));
            Assert.That(result, Does.Contain("x"));
            Assert.That(result, Does.Contain("y"));
            Assert.That(result, Does.Contain("z"));
        }

        [Test]
        public void GetStringsSplitsPlusDelimited()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyList".ToLowerInvariant()] = "a+b"
            });

            IReadOnlyList<string> result = options.GetStrings("MyList");

            Assert.That(result, Has.Count.EqualTo(2));
        }

        [Test]
        public void GetStringsReturnsEmptyListWhenKeyMissing()
        {
            var options = new AnalyzerOptions([]);

            IReadOnlyList<string> result = options.GetStrings("NonExistent");

            Assert.That(result, Is.Empty);
        }

        [Test]
        public void GetStringsTrimsWhitespace()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyList".ToLowerInvariant()] = " a ; b ; c "
            });

            IReadOnlyList<string> result = options.GetStrings("MyList");

            Assert.That(result, Has.Count.EqualTo(3));
            Assert.That(result, Does.Contain("a"));
            Assert.That(result, Does.Contain("b"));
            Assert.That(result, Does.Contain("c"));
        }

        [Test]
        public void GetStringsFiltersEmptyEntries()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyList".ToLowerInvariant()] = "a;;b"
            });

            IReadOnlyList<string> result = options.GetStrings("MyList");

            Assert.That(result, Has.Count.EqualTo(2));
        }

        [Test]
        public void GetValueWithBuildMetadataPrefix()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_metadata.AdditionalFiles.{SourceGenerator.Name}MyProp".ToLowerInvariant()] = "val"
            });

            string result = options.GetString("MyProp", buildProperty: false);

            Assert.That(result, Is.EqualTo("val"));
        }

        [Test]
        public void GetBoolWithBuildMetadataPrefix()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_metadata.AdditionalFiles.{SourceGenerator.Name}IsEnabled".ToLowerInvariant()] = "true"
            });

            bool result = options.GetBool("IsEnabled", buildProperty: false);

            Assert.That(result, Is.True);
        }

        [Test]
        public void GetIntegerWithBuildMetadataPrefix()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_metadata.AdditionalFiles.{SourceGenerator.Name}Count".ToLowerInvariant()] = "7"
            });

            int result = options.GetInteger("Count", buildProperty: false);

            Assert.That(result, Is.EqualTo(7));
        }

        [Test]
        public void ToNodeSetOptionsWithNullReturnsDefaults()
        {
            NodesetFileOptions result = Extensions.ToNodeSetOptions(null!);

            Assert.That(result, Is.Not.Null);
            Assert.That(result.Ignore, Is.False);
            Assert.That(result.Prefix, Is.Null);
            Assert.That(result.Version, Is.Null);
            Assert.That(result.Name, Is.Null);
            Assert.That(result.ModelUri, Is.Null);
        }

        [Test]
        public void ToNodeSetOptionsWithValidOptionsPopulatesAllProperties()
        {
            string prefix = $"build_metadata.AdditionalFiles.{SourceGenerator.Name}";
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"{prefix}Ignore".ToLowerInvariant()] = "true",
                [$"{prefix}Prefix".ToLowerInvariant()] = "MyPrefix",
                [$"{prefix}Version".ToLowerInvariant()] = "1.0",
                [$"{prefix}Name".ToLowerInvariant()] = "MyName",
                [$"{prefix}ModelUri".ToLowerInvariant()] = "http://test.org"
            });

            NodesetFileOptions result = options.ToNodeSetOptions();

            Assert.That(result.Ignore, Is.True);
            Assert.That(result.Prefix, Is.EqualTo("MyPrefix"));
            Assert.That(result.Version, Is.EqualTo("1.0"));
            Assert.That(result.Name, Is.EqualTo("MyName"));
            Assert.That(result.ModelUri, Is.EqualTo("http://test.org"));
        }

        [Test]
        public void ToNodeSetOptionsWithEmptyOptionsSetsDefaults()
        {
            var options = new AnalyzerOptions([]);

            NodesetFileOptions result = options.ToNodeSetOptions();

            Assert.That(result.Ignore, Is.False);
            Assert.That(result.Prefix, Is.EqualTo(string.Empty));
            Assert.That(result.Version, Is.EqualTo(string.Empty));
            Assert.That(result.Name, Is.EqualTo(string.Empty));
            Assert.That(result.ModelUri, Is.EqualTo(string.Empty));
        }

        [Test]
        public void GetFullNamespaceReturnsNamespaceForType()
        {
            const string code = @"
namespace My.Test.Namespace
{
    public class TestClass { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("My.Test.Namespace.TestClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.GetFullNamespace(), Is.EqualTo("My.Test.Namespace"));
        }

        [Test]
        public void GetFullNamespaceReturnsEmptyForGlobalNamespace()
        {
            const string code = "public class GlobalClass { }";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("GlobalClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.GetFullNamespace(), Is.EqualTo(string.Empty));
        }

        [Test]
        public void GetFullNamespaceReturnsSingleSegmentNamespace()
        {
            const string code = @"
namespace Single
{
    public class TestClass { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Single.TestClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.GetFullNamespace(), Is.EqualTo("Single"));
        }

        [Test]
        public void GetFullyQualifiedTypeNameReturnsGlobalPrefixed()
        {
            const string code = @"
namespace My.Namespace
{
    public class MyType { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("My.Namespace.MyType")!;

            Assert.That(symbol, Is.Not.Null);
            string result = symbol.GetFullyQualifiedTypeName();
            Assert.That(result, Does.StartWith("global::"));
            Assert.That(result, Does.Contain("My.Namespace.MyType"));
        }

        [Test]
        public void ImplementsInterfaceReturnsTrueWhenImplemented()
        {
            const string code = @"
namespace Test
{
    public interface IMyInterface { }
    public class MyClass : IMyInterface { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.ImplementsInterface("IMyInterface"), Is.True);
        }

        [Test]
        public void ImplementsInterfaceReturnsFalseWhenNotImplemented()
        {
            const string code = @"
namespace Test
{
    public interface IMyInterface { }
    public class MyClass { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.ImplementsInterface("IMyInterface"), Is.False);
        }

        [Test]
        public void HasAttributeReturnsFalseWhenAbsent()
        {
            const string code = @"
namespace Test
{
    public class MyClass { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.HasAttribute("ObsoleteAttribute"), Is.False);
        }

        [Test]
        public void AttributeDataGetValueReturnsNullForNullAttribute()
        {
            AttributeData? attr = null;

            string result = attr!.GetValue("SomeName");

            Assert.That(result, Is.Null);
        }

        [Test]
        public void AttributeDataGetValueReturnsNullWhenNameNotFound()
        {
            const string code = """

using System;
namespace Test
{
    [Obsolete("reason")]
    public class MyClass { }
}

""";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;
            AttributeData attr = symbol!.GetAttributes().First();

            string result = attr.GetValue("NonExistentName");

            Assert.That(result, Is.Null);
        }

#if NET8_0_OR_GREATER
        [Test]
        public void AttributeDataGetValueReturnsStringValueWhenFound()
        {
            const string code = """

using System;
using System.ComponentModel;
namespace Test
{
    [DefaultValue(Name = "hello")]
    public class MyClass { }

    [AttributeUsage(AttributeTargets.Class)]
    public class DefaultValueAttribute : Attribute
    {
        public string Name { get; set; }
    }
}

""";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;
            AttributeData attr = symbol.GetAttributes()
                .First(a => a.AttributeClass?.Name == "DefaultValueAttribute");

            string result = attr.GetValue("Name");

            Assert.That(result, Is.EqualTo("hello"));
        }

        [Test]
        public void AttributeDataGetIntegerReturnsValueWhenFound()
        {
            const string code = @"
using System;
namespace Test
{
    [MyAttr(Count = 7)]
    public class MyClass { }

    [AttributeUsage(AttributeTargets.Class)]
    public class MyAttrAttribute : Attribute
    {
        public int Count { get; set; }
    }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;
            AttributeData attr = symbol.GetAttributes()
                .First(a => a.AttributeClass?.Name == "MyAttrAttribute");

            int result = attr.GetInteger("Count");

            Assert.That(result, Is.EqualTo(7));
        }

        [Test]
        public void HasAttributeReturnsTrueWhenPresent()
        {
            const string code = @"
using System;
namespace Test
{
    [Obsolete]
    public class MyClass { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.HasAttribute("ObsoleteAttribute"), Is.True);
        }
#endif

        [Test]
        public void AttributeDataGetIntegerReturnsDefaultForNullAttribute()
        {
            AttributeData? attr = null;

            int result = attr!.GetInteger("SomeName", 42);

            Assert.That(result, Is.EqualTo(42));
        }

        [Test]
        public void AttributeDataGetIntegerReturnsDefaultWhenNameNotFound()
        {
            const string code = """

using System;
namespace Test
{
    [Obsolete("reason")]
    public class MyClass { }
}

""";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;
            AttributeData attr = symbol!.GetAttributes().First();

            int result = attr.GetInteger("NonExistent", 99);

            Assert.That(result, Is.EqualTo(99));
        }

        [Test]
        public void AttributeDataGetIntegerReturnsDefaultValueOfZero()
        {
            AttributeData? attr = null;

            int result = attr!.GetInteger("SomeName");

            Assert.That(result, Is.Zero);
        }

        [Test]
        public void GetValueWithCustomConverterAppliesConverter()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyProp".ToLowerInvariant()] = "42"
            });

            int result = options.GetValue(
                "MyProp",
                s => int.Parse(s, System.Globalization.CultureInfo.InvariantCulture));

            Assert.That(result, Is.EqualTo(42));
        }

        [Test]
        public void GetValueWithMissingKeyPassesNullToConverter()
        {
            var options = new AnalyzerOptions([]);

            string result = options.GetValue("Missing", s => s ?? "default");

            Assert.That(result, Is.EqualTo("default"));
        }

        [Test]
        public void GetValueWithBuildMetadataPrefixUsesCorrectKey()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_metadata.AdditionalFiles.{SourceGenerator.Name}Prop".ToLowerInvariant()] = "val"
            });

            string result = options.GetValue("Prop", s => s, buildProperty: false);

            Assert.That(result, Is.EqualTo("val"));
        }

        [Test]
        public void GetStringsMixedDelimitersParseCorrectly()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}Items".ToLowerInvariant()] = "a;b,c+d"
            });

            IReadOnlyList<string> result = options.GetStrings("Items");

            Assert.That(result, Has.Count.EqualTo(4));
            Assert.That(result, Does.Contain("a"));
            Assert.That(result, Does.Contain("b"));
            Assert.That(result, Does.Contain("c"));
            Assert.That(result, Does.Contain("d"));
        }

        [Test]
        public void ImplementsInterfaceWithInheritedInterfaceReturnsTrue()
        {
            const string code = @"
namespace Test
{
    public interface IBase { }
    public interface IDerived : IBase { }
    public class MyClass : IDerived { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.ImplementsInterface("IBase"), Is.True);
            Assert.That(symbol.ImplementsInterface("IDerived"), Is.True);
        }

        [Test]
        public void GetFullNamespaceWithDeeplyNestedNamespace()
        {
            const string code = @"
namespace A.B.C.D.E
{
    public class DeepClass { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("A.B.C.D.E.DeepClass")!;

            Assert.That(symbol, Is.Not.Null);
            Assert.That(symbol.GetFullNamespace(), Is.EqualTo("A.B.C.D.E"));
        }

        [Test]
        public void GetFullyQualifiedTypeNameOmitsGlobalNamespace()
        {
            const string code = @"
namespace Test
{
    public class SimpleType { }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.SimpleType")!;

            Assert.That(symbol, Is.Not.Null);
            string result = symbol.GetFullyQualifiedTypeName();
            Assert.That(result, Is.EqualTo("global::Test.SimpleType"));
        }

        [Test]
        public void AttributeDataGetValueReturnsNullForNonStringNamedArgument()
        {
            const string code = @"
using System;
namespace Test
{
    [MyAttr(Count = 5)]
    public class MyClass { }

    [AttributeUsage(AttributeTargets.Class)]
    public class MyAttrAttribute : Attribute
    {
        public int Count { get; set; }
    }
}
";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;
            AttributeData attr = symbol!.GetAttributes()
                .First(a => a.AttributeClass?.Name == "MyAttrAttribute");

            string result = attr.GetValue("Count");

            Assert.That(result, Is.Null);
        }

        [Test]
        public void AttributeDataGetIntegerReturnsDefaultForNonIntegerNamedArgument()
        {
            const string code = """

using System;
namespace Test
{
    [MyAttr(Name = "hello")]
    public class MyClass { }

    [AttributeUsage(AttributeTargets.Class)]
    public class MyAttrAttribute : Attribute
    {
        public string Name { get; set; }
    }
}

""";
            CSharpCompilation compilation = CSharpCompilation.Create("TestAssembly")
                .AddReferences(CompilerUtils.TrustedReferences)
                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(code));

            INamedTypeSymbol symbol = compilation.GetTypeByMetadataName("Test.MyClass")!;
            AttributeData attr = symbol!.GetAttributes()
                .First(a => a.AttributeClass?.Name == "MyAttrAttribute");

            int result = attr.GetInteger("Name", 99);

            Assert.That(result, Is.EqualTo(99));
        }

        [Test]
        public void ToNodeSetOptionsIgnoreFieldFromBuildMetadata()
        {
            string prefix = $"build_metadata.AdditionalFiles.{SourceGenerator.Name}";
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"{prefix}Ignore".ToLowerInvariant()] = "false"
            });

            NodesetFileOptions result = options.ToNodeSetOptions();

            Assert.That(result.Ignore, Is.False);
        }

        [Test]
        public void IsDesignOrNodeset2FileReturnsTrueForXml()
        {
            var text = EmbeddedAdditionalText.Create("file.xml");

            Assert.That(text.IsDesignOrNodeset2File(), Is.True);
        }

        [TestCase("<opc:ModelDesign xmlns:opc=\"http://opcfoundation.org/UA/ModelDesign.xsd\" />", true)]
        [TestCase("<?xml version=\"1.0\"?>\n<!-- c -->\n<UANodeSet xmlns=\"http://opcfoundation.org/UA/2011/03/UANodeSet.xsd\" />", true)]
        [TestCase("<linker><assembly fullname=\"A\" /></linker>", false)]
        [TestCase("<ModelDesign xmlns=\"http://example.org/other\" />", false)]
        [TestCase("<ModelDesign", true)]
        public void IsDesignOrNodeset2FileSniffsTheRootElement(string content, bool expected)
        {
            // Only a ModelDesign or UANodeSet root is a model input; a file
            // that cannot be parsed stays one so the model pipeline reports it.
            var text = EmbeddedAdditionalText.Create("file.xml", content);

            Assert.That(text.IsDesignOrNodeset2File(), Is.EqualTo(expected));
        }

        [Test]
        public void GetStringsComparesByContent()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_property.{SourceGenerator.Name}MyList".ToLowerInvariant()] = "a;b"
            });

            // The options records carry this list; a fresh list per evaluation
            // must still compare equal or the incremental cache never hits.
            IReadOnlyList<string> first = options.GetStrings("MyList");
            IReadOnlyList<string> second = options.GetStrings("MyList");
            Assert.That(ReferenceEquals(first, second), Is.False);
            Assert.That(
                EqualityComparer<IReadOnlyList<string>>.Default.Equals(first, second),
                Is.True,
                "a record's generated equality compares the member this way");
            Assert.That(
                EqualityComparer<IReadOnlyList<string>>.Default.GetHashCode(first),
                Is.EqualTo(EqualityComparer<IReadOnlyList<string>>.Default.GetHashCode(second)));
        }

        [Test]
        public void IsDesignOrNodeset2FileReturnsFalseForCsv()
        {
            var text = EmbeddedAdditionalText.Create("file.csv");

            Assert.That(text.IsDesignOrNodeset2File(), Is.False);
        }

        [Test]
        public void IsIdentifierFileReturnsTrueForCsv()
        {
            var text = EmbeddedAdditionalText.Create("ids.csv", "Name,1,ObjectType");

            Assert.That(text.IsIdentifierFile(), Is.True);
        }

        [Test]
        public void IsIdentifierFileReturnsFalseForXml()
        {
            var text = EmbeddedAdditionalText.Create("ids.xml");

            Assert.That(text.IsIdentifierFile(), Is.False);
        }

        [TestCase("test.XML", true)]
        [TestCase("test.Xml", true)]
        [TestCase("test.txt", false)]
        public void HasFileExtensionIsCaseInsensitive(
            string path, bool expected)
        {
            var text = EmbeddedAdditionalText.Create(path);

            Assert.That(text.HasFileExtension("xml"), Is.EqualTo(expected));
        }

        [Test]
        public void GetStringsWithBuildMetadataPrefix()
        {
            var options = new AnalyzerOptions(new Dictionary<string, string>
            {
                [$"build_metadata.AdditionalFiles.{SourceGenerator.Name}Items".ToLowerInvariant()] = "a;b"
            });

            IReadOnlyList<string> result = options.GetStrings("Items", buildProperty: false);

            Assert.That(result, Has.Count.EqualTo(2));
            Assert.That(result, Does.Contain("a"));
            Assert.That(result, Does.Contain("b"));
        }

        [Test]
        public void ToNodeSetFileCollectionWithEmptyArrayReturnsCollection()
        {
#pragma warning disable IDE0301 // Simplify collection initialization
            ImmutableArray<(AdditionalText, NodesetFileOptions)> files =
                ImmutableArray<(AdditionalText, NodesetFileOptions)>.Empty;
#pragma warning restore IDE0301 // Simplify collection initialization
            using var fileSystem = new VirtualFileSystem();
            var telemetry = new NullTelemetry();

            NodesetFileCollection collection = files.ToNodeSetFileCollection(
                [],
                fileSystem,
                telemetry);

            Assert.That(collection, Is.Not.Null);
        }

        private sealed class EmbeddedAdditionalText : AdditionalText
        {
            private EmbeddedAdditionalText(string path, string content)
            {
                Path = path;
                m_text = SourceText.From(content);
            }

            public override string Path { get; }

            public override SourceText GetText(
                System.Threading.CancellationToken cancellationToken = default)
            {
                return m_text;
            }

            public static EmbeddedAdditionalText Create(
                string path,
                string content = "")
            {
                return new EmbeddedAdditionalText(path, content);
            }

            private readonly SourceText m_text;
        }

        private sealed class NullTelemetry : TelemetryContextBase
        {
            public NullTelemetry()
                : base(NullLoggerFactory.Instance)
            {
            }
        }
    }
}