using Microsoft.AspNetCore.Mvc;
using CodePlay.Core.Converters;
using CodePlay.Core.Models;
using CodePlay.Core.Common;
using CodePlay.Core.Services;
using CodePlay.Core.Parsers;

namespace CodePlay.WebAPI.Controllers;

[ApiController]
[Route("api/[controller]")]
public class ConversionController : ControllerBase
{
    private readonly ILogger<ConversionController> _logger;

    public ConversionController(ILogger<ConversionController> logger)
    {
        _logger = logger;
    }

    [HttpPost("convert")]
    public async Task<ActionResult<ConversionResult>> Convert([FromBody] ConversionRequest request)
    {
        try
        {
            _logger.LogInformation("收到转换请求：{Source} -> {Target}", request.SourceLanguage, request.TargetLanguage);

            if (string.IsNullOrWhiteSpace(request.SourceCode))
                return BadRequest("源代码不能为空");

            if (request.SourceLanguage.Equals("CSharp", StringComparison.OrdinalIgnoreCase) &&
                request.TargetLanguage.Equals("Java", StringComparison.OrdinalIgnoreCase))
            {
                var parser = new CSharpParser();
                var tree = await parser.ParseAsync(request.SourceCode);
                var converter = new CSharpToJavaConverter();
                var options = new ConversionOptions { KeepComments = true, KeepDocStrings = true, AutoFormat = true };
                var result = await converter.ConvertAsync(tree, LanguageType.Java, options);
                
                _logger.LogInformation("转换完成：成功={Success}", result.Success);
                return Ok(result);
            }
            else
            {
                return BadRequest($"暂不支持 {request.SourceLanguage} -> {request.TargetLanguage} 转换");
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "转换失败");
            return StatusCode(500, new { error = ex.Message });
        }
    }

    [HttpGet("supported")]
    public ActionResult GetSupportedConversions()
    {
        return Ok(new[] { new { Source = "CSharp", Target = "Java", Status = "Ready" } });
    }

    [HttpPost("batch")]
    public async Task<ActionResult<BatchConversionResult>> BatchConvert([FromBody] BatchConversionRequest request)
    {
        try
        {
            _logger.LogInformation("批量转换：{Count} files", request.Files?.Count ?? 0);
            
            var result = new BatchConversionResult { TotalFiles = request.Files?.Count ?? 0, Results = new List<FileConversionResult>() };

            if (request.Files == null) return BadRequest("文件列表为空");

            foreach (var file in request.Files)
            {
                try
                {
                    if (request.SourceLanguage.Equals("CSharp", StringComparison.OrdinalIgnoreCase) &&
                        request.TargetLanguage.Equals("Java", StringComparison.OrdinalIgnoreCase))
                    {
                        var parser = new CSharpParser();
                        var tree = await parser.ParseAsync(file.Content);
                        var converter = new CSharpToJavaConverter();
                        var convResult = await converter.ConvertAsync(tree, LanguageType.Java, new ConversionOptions());

                        result.Results.Add(new FileConversionResult
                        {
                            FileName = file.FileName, Success = convResult.Success,
                            TransformedCode = convResult.TransformedCode,
                            LinesConverted = convResult.Report?.LinesConverted ?? 0
                        });
                        if (convResult.Success) result.SuccessfulFiles++;
                    }
                }
                catch (Exception ex)
                {
                    result.Results.Add(new FileConversionResult { FileName = file.FileName, Success = false, ErrorMessage = ex.Message });
                }
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            return StatusCode(500, new { error = ex.Message });
        }
    }
}

public class BatchConversionRequest
{
    public string SourceLanguage { get; set; } = "";
    public string TargetLanguage { get; set; } = "";
    public List<FileRequest>? Files { get; set; }
}

public class FileRequest
{
    public string FileName { get; set; } = "";
    public string Content { get; set; } = "";
}

public class BatchConversionResult
{
    public bool Success => SuccessfulFiles > 0;
    public int TotalFiles { get; set; }
    public int SuccessfulFiles { get; set; }
    public List<FileConversionResult> Results { get; set; } = new();
}

public class FileConversionResult
{
    public string FileName { get; set; } = "";
    public bool Success { get; set; }
    public string? TransformedCode { get; set; }
    public string? ErrorMessage { get; set; }
    public int LinesConverted { get; set; }
}