using System.Text.RegularExpressions;
using CodePlay.Core.Interfaces;
using CodePlay.Core.Models;

namespace CodePlay.Core.Pipeline.Converters;

/// <summary>
/// Lambda 表达式转换器 - C# lambda → Java lambda
/// </summary>
public class LambdaConverter : ILineConverter
{
    public int Priority => 50;
    
    public string Convert(string line, ConversionContext context)
    {
        var result = line;
        
        // 单参数 lambda: x => expr
        result = Regex.Replace(result, @"(\w+)\s*=>\s*\{", "$1 -> {");
        result = Regex.Replace(result, @"(\w+)\s*=>(?!\s*\{)", "$1 -> ");
        
        // 多参数 lambda: (x, y) => expr
        result = Regex.Replace(result, @"\(([\w,\s]+)\)\s*=>\s*\{", "($1) -> {");
        result = Regex.Replace(result, @"\(([\w,\s]+)\)\s*=>(?!\s*\{)", "($1) -> ");
        
        return result;
    }
}