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

namespace CodePlay.Core.Services;

public interface IBatchConversionService
{
    Task<BatchConversionResult> ConvertDirectoryAsync(string sourceDirectory, string targetDirectory, 
        LanguageType sourceLanguage, LanguageType targetLanguage, ConversionOptions? options = null,
        CancellationToken cancellationToken = default);
    
    Task<BatchConversionResult> ConvertFilesAsync(IEnumerable<string> sourceFiles, string targetDirectory, 
        LanguageType sourceLanguage, LanguageType targetLanguage, ConversionOptions? options = null,
        CancellationToken cancellationToken = default);
}

public class BatchConversionService : IBatchConversionService
{
    private readonly ConversionService _conversionService;
    private readonly IReportStorageService _reportStorageService;
    
    public BatchConversionService(ConversionService conversionService, IReportStorageService reportStorageService)
    {
        _conversionService = conversionService;
        _reportStorageService = reportStorageService;
    }
    
    public async Task<BatchConversionResult> ConvertDirectoryAsync(string sourceDirectory, string targetDirectory, 
        LanguageType sourceLanguage, LanguageType targetLanguage, ConversionOptions? options = null,
        CancellationToken cancellationToken = default)
    {
        var result = new BatchConversionResult
        {
            SourceDirectory = sourceDirectory,
            TargetDirectory = targetDirectory,
            SourceLanguage = sourceLanguage,
            TargetLanguage = targetLanguage,
            StartedAt = DateTime.UtcNow
        };
        
        if (!Directory.Exists(sourceDirectory))
        {
            result.Success = false;
            result.ErrorMessage = $"Source directory not found: {sourceDirectory}";
            return result;
        }
        
        var fileExtension = GetFileExtension(sourceLanguage);
        var sourceFiles = Directory.GetFiles(sourceDirectory, $"*{fileExtension}", SearchOption.AllDirectories);
        
        return await ConvertFilesAsync(sourceFiles, targetDirectory, sourceLanguage, targetLanguage, options, cancellationToken);
    }
    
    public async Task<BatchConversionResult> ConvertFilesAsync(IEnumerable<string> sourceFiles, string targetDirectory, 
        LanguageType sourceLanguage, LanguageType targetLanguage, ConversionOptions? options = null,
        CancellationToken cancellationToken = default)
    {
        var result = new BatchConversionResult
        {
            TargetDirectory = targetDirectory,
            SourceLanguage = sourceLanguage,
            TargetLanguage = targetLanguage,
            StartedAt = DateTime.UtcNow,
            TotalFiles = sourceFiles.Count()
        };
        
        if (!Directory.Exists(targetDirectory))
        {
            Directory.CreateDirectory(targetDirectory);
        }
        
        var targetExtension = GetFileExtension(targetLanguage);
        
        foreach (var sourceFile in sourceFiles)
        {
            if (cancellationToken.IsCancellationRequested)
            {
                result.CancelledAt = DateTime.UtcNow;
                break;
            }
            
            try
            {
                var relativePath = Path.GetRelativePath(Path.GetDirectoryName(sourceFile)!, sourceFile);
                var targetFileName = Path.ChangeExtension(relativePath, targetExtension);
                var targetFilePath = Path.Combine(targetDirectory, targetFileName);
                
                var targetFileDir = Path.GetDirectoryName(targetFilePath)!;
                if (!Directory.Exists(targetFileDir))
                {
                    Directory.CreateDirectory(targetFileDir);
                }
                
                var sourceCode = await File.ReadAllTextAsync(sourceFile, cancellationToken);
                var conversionResult = await _conversionService.ConvertAsync(
                    sourceCode, sourceLanguage.ToName(), targetLanguage.ToName(), options ?? new ConversionOptions());
                
                if (conversionResult.Success)
                {
                    await File.WriteAllTextAsync(targetFilePath, conversionResult.TransformedCode, cancellationToken);
                    
                    result.SuccessfulFiles++;
                    result.ConvertedFiles.Add(new ConvertedFileInfo
                    {
                        SourceFile = sourceFile,
                        TargetFile = targetFilePath,
                        LinesConverted = conversionResult.Report?.LinesConverted ?? 0,
                        ClassesConverted = conversionResult.Report?.ClassesConverted ?? 0,
                        MethodsConverted = conversionResult.Report?.MethodsConverted ?? 0,
                        Warnings = conversionResult.Warnings.Count,
                        Issues = conversionResult.Report?.Issues.Count ?? 0
                    });
                    
                    if (conversionResult.Report != null)
                    {
                        conversionResult.Report.ProjectId = "batch-" + DateTime.UtcNow.ToString("yyyyMMdd");
                        await _reportStorageService.SaveReportAsync(conversionResult.Report);
                    }
                }
                else
                {
                    result.FailedFiles++;
                    result.FailedFileList.Add(new FailedFileInfo
                    {
                        SourceFile = sourceFile,
                        ErrorMessage = conversionResult.ErrorMessage ?? "Unknown error"
                    });
                }
            }
            catch (Exception ex)
            {
                result.FailedFiles++;
                result.FailedFileList.Add(new FailedFileInfo
                {
                    SourceFile = sourceFile,
                    ErrorMessage = ex.Message
                });
            }
        }
        
        result.CompletedAt = DateTime.UtcNow;
        result.Duration = result.CompletedAt - result.StartedAt;
        result.Success = result.FailedFiles == 0;
        
        return result;
    }
    
    private string GetFileExtension(LanguageType language)
    {
        return language switch
        {
            LanguageType.CSharp => ".cs",
            LanguageType.Java => ".java",
            LanguageType.CPlusPlus => ".cpp",
            _ => throw new ArgumentException($"Unsupported language: {language}")
        };
    }
}

public class BatchConversionResult
{
    public bool Success { get; set; }
    public string? ErrorMessage { get; set; }
    public string SourceDirectory { get; set; } = string.Empty;
    public string TargetDirectory { get; set; } = string.Empty;
    public LanguageType SourceLanguage { get; set; }
    public LanguageType TargetLanguage { get; set; }
    public int TotalFiles { get; set; }
    public int SuccessfulFiles { get; set; }
    public int FailedFiles { get; set; }
    public DateTime StartedAt { get; set; }
    public DateTime? CompletedAt { get; set; }
    public DateTime? CancelledAt { get; set; }
    public TimeSpan? Duration { get; set; }
    public List<ConvertedFileInfo> ConvertedFiles { get; set; } = new();
    public List<FailedFileInfo> FailedFileList { get; set; } = new();
}

public class ConvertedFileInfo
{
    public string SourceFile { get; set; } = string.Empty;
    public string TargetFile { get; set; } = string.Empty;
    public int LinesConverted { get; set; }
    public int ClassesConverted { get; set; }
    public int MethodsConverted { get; set; }
    public int Warnings { get; set; }
    public int Issues { get; set; }
}

public class FailedFileInfo
{
    public string SourceFile { get; set; } = string.Empty;
    public string? TargetFile { get; set; }
    public string ErrorMessage { get; set; } = string.Empty;
}