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

namespace CodePlay.Core.Converters;

/// <summary>
/// Python 到 C# 转换器
/// </summary>
public class PythonToCSharpConverter : IConverter
{
    public async Task<ConversionResult> ConvertAsync(
        SyntaxTree syntaxTree, 
        LanguageType targetLanguage, 
        ConversionOptions? options = null, 
        CancellationToken cancellationToken = default)
    {
        var result = new ConversionResult
        {
            TransformedCode = ConvertToCSharp(syntaxTree.SourceCode ?? ""),
            Report = new ConversionReport()
        };
        
        await Task.CompletedTask;
        return result;
    }
    
    private string ConvertToCSharp(string pythonCode)
    {
        var sb = new StringBuilder();
        sb.AppendLine("// 从 Python 转换而来 - 需要手动审查");
        sb.AppendLine();
        
        var lines = pythonCode.Split('\n');
        
        foreach (var line in lines)
        {
            var trimmed = line.Trim();
            if (string.IsNullOrEmpty(trimmed))
            {
                sb.AppendLine();
                continue;
            }
            
            // Python import -> C# using
            if (trimmed.StartsWith("import "))
            {
                var module = trimmed.Substring(7).Trim();
                sb.AppendLine($"// using {module}; // TODO: 映射 .NET 命名空间");
                continue;
            }
            
            // Python class -> C# class
            var classMatch = System.Text.RegularExpressions.Regex.Match(trimmed, @"class\s+(\w+)");
            if (classMatch.Success)
            {
                sb.AppendLine($"public class {classMatch.Groups[1].Value}");
                sb.AppendLine("{");
                continue;
            }
            
            // Python def -> C# method
            var defMatch = System.Text.RegularExpressions.Regex.Match(trimmed, @"def\s+(\w+)\s*\(([^)]*)\)");
            if (defMatch.Success)
            {
                var methodName = defMatch.Groups[1].Value;
                var parameters = defMatch.Groups[2].Value;
                sb.AppendLine($"    public void {methodName}({ConvertPythonParams(parameters)})");
                sb.AppendLine("    {");
                sb.AppendLine("        // TODO: 实现方法体");
                sb.AppendLine("    }");
                continue;
            }
            
            // 检测类结束（缩进减少）
            if (trimmed.StartsWith("}") || line.TrimStart().Length == line.Length)
            {
                sb.AppendLine("}");
            }
        }
        
        return sb.ToString();
    }
    
    private string ConvertPythonParams(string pythonParams)
    {
        if (string.IsNullOrWhiteSpace(pythonParams)) return "";
        
        var parts = pythonParams.Split(',');
        var csharpParams = new List<string>();
        
        foreach (var part in parts)
        {
            var param = part.Trim();
            if (param == "self") continue;
            csharpParams.Add($"object {param}");
        }
        
        return string.Join(", ", csharpParams);
    }
}