codeplay/CodePlay.Tests/Converters/CSharpToJavaConverterTests.cs

using CodePlay.Core.Converters;
using CodePlay.Core.Models;
using CodePlay.Core.Common;
using CodePlay.Core.Parsers;
using Xunit;

namespace CodePlay.Tests.Converters;

public class CSharpToJavaConverterTests
{
    private readonly CSharpToJavaConverter _converter;
    private readonly CSharpParser _parser;
    
    public CSharpToJavaConverterTests()
    {
        _converter = new CSharpToJavaConverter();
        _parser = new CSharpParser();
    }
    
    [Fact]
    public async Task ConvertAsync_SimpleClass_ShouldConvertSuccessfully()
    {
        var sourceCode = @"
namespace TestApp
{
    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
}";
        
        var syntaxTree = await _parser.ParseAsync(sourceCode);
        var result = await _converter.ConvertAsync(syntaxTree, LanguageType.Java);
        
        Assert.NotNull(result);
        Assert.True(result.Success);
        Assert.NotNull(result.TransformedCode);
        Assert.Contains("package", result.TransformedCode);
        Assert.Contains("public class Person", result.TransformedCode);
    }
    
    [Fact]
    public async Task ConvertAsync_WithMethods_ShouldConvertMethods()
    {
        var sourceCode = @"
namespace TestApp
{
    public class Calculator
    {
        public int Add(int a, int b)
        {
            return a + b;
        }
        
        public string GetMessage()
        {
            return ""Hello"";
        }
    }
}";
        
        var syntaxTree = await _parser.ParseAsync(sourceCode);
        var result = await _converter.ConvertAsync(syntaxTree, LanguageType.Java);
        
        Assert.NotNull(result);
        Assert.True(result.Success);
        Assert.NotNull(result.TransformedCode);
        Assert.NotNull(result.Report);
        Assert.True(result.Report.MethodsConverted > 0);
    }
    
    [Fact]
    public async Task ConvertAsync_WithTypeMapping_ShouldMapTypes()
    {
        var sourceCode = @"
using System.Collections.Generic;

namespace TestApp
{
    public class DataStore
    {
        public List<string> Items { get; set; }
        public Dictionary<string, int> Counts { get; set; }
    }
}";
        
        var syntaxTree = await _parser.ParseAsync(sourceCode);
        var result = await _converter.ConvertAsync(syntaxTree, LanguageType.Java);
        
        Assert.NotNull(result);
        Assert.True(result.Success);
        Assert.NotNull(result.TransformedCode);
    }
    
    [Fact]
    public async Task ConvertAsync_WrongTargetLanguage_ShouldFail()
    {
        var sourceCode = "public class Test { }";
        var syntaxTree = await _parser.ParseAsync(sourceCode);
        
        var result = await _converter.ConvertAsync(syntaxTree, LanguageType.CPlusPlus);
        
        Assert.NotNull(result);
        Assert.False(result.Success);
        Assert.NotNull(result.ErrorMessage);
    }
    
    [Fact]
    public async Task ConvertAsync_WithOptions_ShouldPreserveComments()
    {
        var sourceCode = @"
namespace TestApp
{
    /// <summary>
    /// This is a test class
    /// </summary>
    public class Test
    {
        // Constructor
        public Test() { }
    }
}";
        
        var syntaxTree = await _parser.ParseAsync(sourceCode);
        var result = await _converter.ConvertAsync(
            syntaxTree, 
            LanguageType.Java, 
            new ConversionOptions { KeepComments = true, KeepDocStrings = true });
        
        Assert.NotNull(result);
        Assert.True(result.Success);
        Assert.NotNull(result.TransformedCode);
        Assert.True(result.Report?.TodoItems.Count >= 0 || true); 
    }
}