using CodePlay.Core.Interfaces;
using CodePlay.Core.Models;
using CodePlay.Core.Common;

namespace CodePlay.Core.Converters;

public class JavaToCSharpConverter : IConverter
{
    private readonly JavaToCSharpStrategy _strategy;
    private readonly CSharpCodeGenerator _generator;
    
    public JavaToCSharpConverter()
    {
        _strategy = new JavaToCSharpStrategy();
        _generator = new CSharpCodeGenerator();
    }
    
    public async Task<ConversionResult> ConvertAsync(SyntaxTree syntaxTree, LanguageType targetLanguage, ConversionOptions? options = null, CancellationToken cancellationToken = default)
    {
        var result = new ConversionResult { Success = false, Report = new ConversionReport() };
        
        if (targetLanguage != LanguageType.CSharp)
        {
            result.ErrorMessage = "仅支持 Java -> C# 转换";
            return result;
        }
        
        try
        {
            var context = new ConversionContext { SourceLanguage = LanguageType.Java, TargetLanguage = LanguageType.CSharp, Options = options };
            var convertedRoot = _strategy.ConvertNode(syntaxTree.Root, context);
            
            var convertedTree = new SyntaxTree
            {
                Language = LanguageType.CSharp,
                Root = convertedRoot,
                SourceCode = syntaxTree.SourceCode
            };
            
            result.TransformedCode = _generator.Generate(convertedTree);
            result.Success = true;
            result.Report.LinesConverted = syntaxTree.SourceCode?.Split('\n').Length ?? 0;
        }
        catch (Exception ex)
        {
            result.ErrorMessage = ex.Message;
        }
        
        return await Task.FromResult(result);
    }
}