using System;
using System.Runtime.CompilerServices;
using FluentAssertions;
using Xunit;

namespace Speckle.InterfaceGenerator.Tests;

public class RecordInterfaceGenerationTests
{
    private readonly ITestRecord _sut;

    public RecordInterfaceGenerationTests()
    {
        _sut = new TestRecord(420);
    }

    [Fact]
    public void RecordProperty_IsGenerated()
    {
        var prop =
            typeof(ITestRecord).GetProperty(nameof(TestRecord.RecordProperty))
            ?? throw new InvalidOperationException();

        prop.Should().NotBeNull();

        prop.GetMethod.Should().NotBeNull();
        prop.SetMethod.Should().NotBeNull();
        prop.SetMethod?.ReturnParameter?.GetRequiredCustomModifiers()
            .Should()
            .Contain(typeof(IsExternalInit));

        _sut.RecordProperty.Should().Be(420);
    }

    [Fact]
    public void RecordMethod_IsGenerated()
    {
        var method = typeof(ITestRecord).GetMethod(nameof(TestRecord.RecordMethod));

        method.Should().NotBeNull();
        method?.ReturnType.Should().Be(typeof(void));

        var parameters = method?.GetParameters();
        parameters.Should().BeEmpty();

        _sut.RecordMethod();
    }

    [Fact]
    public void Deconstruct_IsGenerated()
    {
        var method = typeof(ITestRecord).GetMethod(nameof(TestRecord.Deconstruct));

        method.Should().NotBeNull();
        method?.ReturnType.Should().Be(typeof(void));

        var parameters = method?.GetParameters() ?? throw new InvalidOperationException();
        parameters.Length.Should().Be(1);

        var parameter = parameters[0];
        parameter.ParameterType.Should().Be(typeof(int).MakeByRefType());
        parameter.IsOut.Should().BeTrue();
    }
}

[GenerateAutoInterface]
internal record TestRecord(int RecordProperty) : ITestRecord
{
    public void RecordMethod() { }
}