using IronBarCode;

// Verify installation with a basic barcode read
public class InstallationTest
{
    public static void VerifySetup()
    {
        try
        {
            // Test with a sample barcode image
            var result = BarcodeReader.Read("test-barcode.png");
            
            if (result.Any())
            {
                Console.WriteLine($"Success! Detected: {result.First().Value}");
                Console.WriteLine($"Format: {result.First().BarcodeType}");
                Console.WriteLine($"Confidence: {result.First().Confidence}%");
            }
            else
            {
                Console.WriteLine("No barcode detected in test image");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Setup issue: {ex.Message}");
        }
    }
}

using IronBarCode;

// Verify installation with a basic barcode read
public class InstallationTest
{
    public static void VerifySetup()
    {
        try
        {
            // Test with a sample barcode image
            var result = BarcodeReader.Read("test-barcode.png");
            
            if (result.Any())
            {
                Console.WriteLine($"Success! Detected: {result.First().Value}");
                Console.WriteLine($"Format: {result.First().BarcodeType}");
                Console.WriteLine($"Confidence: {result.First().Confidence}%");
            }
            else
            {
                Console.WriteLine("No barcode detected in test image");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Setup issue: {ex.Message}");
        }
    }
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using IronBarCode;
using System.Drawing;
using System.ComponentModel.DataAnnotations;

namespace BarcodeScannerAPI.Controllers
{
    [ApiController]
    [Route("api/v1/[controller]")]
    [Authorize] // Require authentication for all endpoints
    public class ScannerController : ControllerBase
    {
        private readonly ILogger<ScannerController> _logger;
        private readonly IConfiguration _configuration;
        
        public ScannerController(ILogger<ScannerController> logger, IConfiguration configuration)
        {
            _logger = logger;
            _configuration = configuration;
        }
        
        // Enhanced result model with audit fields
        public class ScanResult
        {
            public bool Success { get; set; }
            public List<BarcodeData> Barcodes { get; set; } = new List<BarcodeData>();
            public string RequestId { get; set; } = Guid.NewGuid().ToString();
            public DateTime ProcessedAt { get; set; } = DateTime.UtcNow;
            public long ProcessingTimeMs { get; set; }
            public string ErrorMessage { get; set; }
            public Dictionary<string, object> Metadata { get; set; } = new Dictionary<string, object>();
        }
        
        public class BarcodeData
        {
            public string Value { get; set; }
            public string Format { get; set; }
            public double Confidence { get; set; }
            public Rectangle Location { get; set; }
            public int PageNumber { get; set; } // For PDF processing
        }
        
        // Input validation model
        public class ScanRequest
        {
            [Required]
            public IFormFile File { get; set; }
            
            [Range(1, 10)]
            public int MaxBarcodes { get; set; } = 5;
            
            public string[] ExpectedFormats { get; set; }
            
            public bool EnableImageCorrection { get; set; } = true;
        }
        
        [HttpPost("scan")]
        [RequestSizeLimit(52428800)] // 50MB limit
        public async Task<ActionResult<ScanResult>> ScanDocument([FromForm] ScanRequest request)
        {
            var stopwatch = System.Diagnostics.Stopwatch.StartNew();
            var result = new ScanResult();
            
            try
            {
                // Validate file type for security
                var allowedExtensions = new[] { ".pdf", ".png", ".jpg", ".jpeg", ".gif", ".tiff", ".bmp" };
                var fileExtension = Path.GetExtension(request.File.FileName).ToLowerInvariant();
                
                if (!allowedExtensions.Contains(fileExtension))
                {
                    _logger.LogWarning($"Rejected file type: {fileExtension}");
                    return BadRequest(new ScanResult
                    {
                        Success = false,
                        ErrorMessage = "Unsupported file type. Allowed: PDF, PNG, JPG, GIF, TIFF, BMP"
                    });
                }
                
                // Process the file
                using var stream = new MemoryStream();
                await request.File.CopyToAsync(stream);
                var fileBytes = stream.ToArray();
                
                // Log for audit trail
                _logger.LogInformation($"Processing {request.File.FileName} ({fileBytes.Length} bytes) - RequestId: {result.RequestId}");
                
                // Configure scanner based on requirements
                var options = ConfigureOptions(request);
                
                // Handle different file types
                BarcodeResults scanResults;
                if (fileExtension == ".pdf")
                {
                    var pdfOptions = new PdfBarcodeReaderOptions
                    {
                        Scale = 3,
                        DPI = 300,
                        MaxThreads = 4
                    };
                    scanResults = BarcodeReader.ReadPdf(fileBytes, pdfOptions);
                }
                else
                {
                    scanResults = BarcodeReader.Read(fileBytes, options);
                }
                
                // Process results
                if (scanResults.Any())
                {
                    result.Success = true;
                    foreach (var barcode in scanResults.Take(request.MaxBarcodes))
                    {
                        result.Barcodes.Add(new BarcodeData
                        {
                            Value = barcode.Value,
                            Format = barcode.BarcodeType.ToString(),
                            Confidence = barcode.Confidence,
                            Location = barcode.Bounds,
                            PageNumber = barcode.PageNumber
                        });
                    }
                    
                    result.Metadata["TotalFound"] = scanResults.Count();
                    result.Metadata["FileSize"] = fileBytes.Length;
                    result.Metadata["FileName"] = request.File.FileName;
                    
                    _logger.LogInformation($"Successfully scanned {scanResults.Count()} barcodes - RequestId: {result.RequestId}");
                }
                else
                {
                    result.Success = false;
                    result.ErrorMessage = "No barcodes detected in the document";
                    _logger.LogWarning($"No barcodes found - RequestId: {result.RequestId}");
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Scanning error - RequestId: {result.RequestId}");
                result.Success = false;
                result.ErrorMessage = "An error occurred during processing";
                
                // Don't expose internal errors to clients
                if (_configuration.GetValue<bool>("DetailedErrors"))
                {
                    result.Metadata["Exception"] = ex.Message;
                }
            }
            finally
            {
                stopwatch.Stop();
                result.ProcessingTimeMs = stopwatch.ElapsedMilliseconds;
            }
            
            return result;
        }
        
        private BarcodeReaderOptions ConfigureOptions(ScanRequest request)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ExpectMultipleBarcodes = request.MaxBarcodes > 1,
                RemoveFalsePositive = true,
                Multithreaded = true,
                MaxParallelThreads = Environment.ProcessorCount
            };
            
            // Apply format filtering if specified
            if (request.ExpectedFormats?.Any() == true)
            {
                var formats = BarcodeEncoding.None;
                foreach (var format in request.ExpectedFormats)
                {
                    if (Enum.TryParse<BarcodeEncoding>(format, true, out var encoding))
                    {
                        formats |= encoding;
                    }
                }
                options.ExpectBarcodeTypes = formats;
            }
            
            // Enable image correction for damaged barcodes
            if (request.EnableImageCorrection)
            {
                options.ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(2),
                    new ContrastFilter(1.5f),
                    new BrightnessFilter(1.1f)
                };
                options.AutoRotate = true;
            }
            
            return options;
        }
        
        // Batch processing endpoint for high-volume scenarios
        [HttpPost("scan-batch")]
        [RequestSizeLimit(524288000)] // 500MB for batch operations
        public async Task<ActionResult<List<ScanResult>>> ScanBatch(List<IFormFile> files)
        {
            if (files == null || !files.Any())
            {
                return BadRequest("No files provided");
            }
            
            if (files.Count > 50)
            {
                return BadRequest("Maximum 50 files per batch");
            }
            
            var tasks = files.Select(file => ProcessFileAsync(file));
            var results = await Task.WhenAll(tasks);
            
            _logger.LogInformation($"Batch processed {files.Count} files, {results.Count(r => r.Success)} successful");
            
            return Ok(results);
        }
        
        private async Task<ScanResult> ProcessFileAsync(IFormFile file)
        {
            // Reuse the scanning logic
            var request = new ScanRequest 
            { 
                File = file,
                EnableImageCorrection = true 
            };
            var actionResult = await ScanDocument(request);
            
            if (actionResult.Result is OkObjectResult okResult)
            {
                return okResult.Value as ScanResult;
            }
            else if (actionResult.Result is BadRequestObjectResult badResult)
            {
                return badResult.Value as ScanResult;
            }
            
            return new ScanResult 
            { 
                Success = false, 
                ErrorMessage = "Processing failed" 
            };
        }
    }
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using IronBarCode;
using System.Drawing;
using System.ComponentModel.DataAnnotations;

namespace BarcodeScannerAPI.Controllers
{
    [ApiController]
    [Route("api/v1/[controller]")]
    [Authorize] // Require authentication for all endpoints
    public class ScannerController : ControllerBase
    {
        private readonly ILogger<ScannerController> _logger;
        private readonly IConfiguration _configuration;
        
        public ScannerController(ILogger<ScannerController> logger, IConfiguration configuration)
        {
            _logger = logger;
            _configuration = configuration;
        }
        
        // Enhanced result model with audit fields
        public class ScanResult
        {
            public bool Success { get; set; }
            public List<BarcodeData> Barcodes { get; set; } = new List<BarcodeData>();
            public string RequestId { get; set; } = Guid.NewGuid().ToString();
            public DateTime ProcessedAt { get; set; } = DateTime.UtcNow;
            public long ProcessingTimeMs { get; set; }
            public string ErrorMessage { get; set; }
            public Dictionary<string, object> Metadata { get; set; } = new Dictionary<string, object>();
        }
        
        public class BarcodeData
        {
            public string Value { get; set; }
            public string Format { get; set; }
            public double Confidence { get; set; }
            public Rectangle Location { get; set; }
            public int PageNumber { get; set; } // For PDF processing
        }
        
        // Input validation model
        public class ScanRequest
        {
            [Required]
            public IFormFile File { get; set; }
            
            [Range(1, 10)]
            public int MaxBarcodes { get; set; } = 5;
            
            public string[] ExpectedFormats { get; set; }
            
            public bool EnableImageCorrection { get; set; } = true;
        }
        
        [HttpPost("scan")]
        [RequestSizeLimit(52428800)] // 50MB limit
        public async Task<ActionResult<ScanResult>> ScanDocument([FromForm] ScanRequest request)
        {
            var stopwatch = System.Diagnostics.Stopwatch.StartNew();
            var result = new ScanResult();
            
            try
            {
                // Validate file type for security
                var allowedExtensions = new[] { ".pdf", ".png", ".jpg", ".jpeg", ".gif", ".tiff", ".bmp" };
                var fileExtension = Path.GetExtension(request.File.FileName).ToLowerInvariant();
                
                if (!allowedExtensions.Contains(fileExtension))
                {
                    _logger.LogWarning($"Rejected file type: {fileExtension}");
                    return BadRequest(new ScanResult
                    {
                        Success = false,
                        ErrorMessage = "Unsupported file type. Allowed: PDF, PNG, JPG, GIF, TIFF, BMP"
                    });
                }
                
                // Process the file
                using var stream = new MemoryStream();
                await request.File.CopyToAsync(stream);
                var fileBytes = stream.ToArray();
                
                // Log for audit trail
                _logger.LogInformation($"Processing {request.File.FileName} ({fileBytes.Length} bytes) - RequestId: {result.RequestId}");
                
                // Configure scanner based on requirements
                var options = ConfigureOptions(request);
                
                // Handle different file types
                BarcodeResults scanResults;
                if (fileExtension == ".pdf")
                {
                    var pdfOptions = new PdfBarcodeReaderOptions
                    {
                        Scale = 3,
                        DPI = 300,
                        MaxThreads = 4
                    };
                    scanResults = BarcodeReader.ReadPdf(fileBytes, pdfOptions);
                }
                else
                {
                    scanResults = BarcodeReader.Read(fileBytes, options);
                }
                
                // Process results
                if (scanResults.Any())
                {
                    result.Success = true;
                    foreach (var barcode in scanResults.Take(request.MaxBarcodes))
                    {
                        result.Barcodes.Add(new BarcodeData
                        {
                            Value = barcode.Value,
                            Format = barcode.BarcodeType.ToString(),
                            Confidence = barcode.Confidence,
                            Location = barcode.Bounds,
                            PageNumber = barcode.PageNumber
                        });
                    }
                    
                    result.Metadata["TotalFound"] = scanResults.Count();
                    result.Metadata["FileSize"] = fileBytes.Length;
                    result.Metadata["FileName"] = request.File.FileName;
                    
                    _logger.LogInformation($"Successfully scanned {scanResults.Count()} barcodes - RequestId: {result.RequestId}");
                }
                else
                {
                    result.Success = false;
                    result.ErrorMessage = "No barcodes detected in the document";
                    _logger.LogWarning($"No barcodes found - RequestId: {result.RequestId}");
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Scanning error - RequestId: {result.RequestId}");
                result.Success = false;
                result.ErrorMessage = "An error occurred during processing";
                
                // Don't expose internal errors to clients
                if (_configuration.GetValue<bool>("DetailedErrors"))
                {
                    result.Metadata["Exception"] = ex.Message;
                }
            }
            finally
            {
                stopwatch.Stop();
                result.ProcessingTimeMs = stopwatch.ElapsedMilliseconds;
            }
            
            return result;
        }
        
        private BarcodeReaderOptions ConfigureOptions(ScanRequest request)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ExpectMultipleBarcodes = request.MaxBarcodes > 1,
                RemoveFalsePositive = true,
                Multithreaded = true,
                MaxParallelThreads = Environment.ProcessorCount
            };
            
            // Apply format filtering if specified
            if (request.ExpectedFormats?.Any() == true)
            {
                var formats = BarcodeEncoding.None;
                foreach (var format in request.ExpectedFormats)
                {
                    if (Enum.TryParse<BarcodeEncoding>(format, true, out var encoding))
                    {
                        formats |= encoding;
                    }
                }
                options.ExpectBarcodeTypes = formats;
            }
            
            // Enable image correction for damaged barcodes
            if (request.EnableImageCorrection)
            {
                options.ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(2),
                    new ContrastFilter(1.5f),
                    new BrightnessFilter(1.1f)
                };
                options.AutoRotate = true;
            }
            
            return options;
        }
        
        // Batch processing endpoint for high-volume scenarios
        [HttpPost("scan-batch")]
        [RequestSizeLimit(524288000)] // 500MB for batch operations
        public async Task<ActionResult<List<ScanResult>>> ScanBatch(List<IFormFile> files)
        {
            if (files == null || !files.Any())
            {
                return BadRequest("No files provided");
            }
            
            if (files.Count > 50)
            {
                return BadRequest("Maximum 50 files per batch");
            }
            
            var tasks = files.Select(file => ProcessFileAsync(file));
            var results = await Task.WhenAll(tasks);
            
            _logger.LogInformation($"Batch processed {files.Count} files, {results.Count(r => r.Success)} successful");
            
            return Ok(results);
        }
        
        private async Task<ScanResult> ProcessFileAsync(IFormFile file)
        {
            // Reuse the scanning logic
            var request = new ScanRequest 
            { 
                File = file,
                EnableImageCorrection = true 
            };
            var actionResult = await ScanDocument(request);
            
            if (actionResult.Result is OkObjectResult okResult)
            {
                return okResult.Value as ScanResult;
            }
            else if (actionResult.Result is BadRequestObjectResult badResult)
            {
                return badResult.Value as ScanResult;
            }
            
            return new ScanResult 
            { 
                Success = false, 
                ErrorMessage = "Processing failed" 
            };
        }
    }
}

// Extended controller with multiple input handlers
[ApiController]
[Route("api/v1/[controller]")]
[Authorize]
public class AdvancedScannerController : ControllerBase
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly ILogger<AdvancedScannerController> _logger;
    
    public AdvancedScannerController(
        IHttpClientFactory httpClientFactory, 
        ILogger<AdvancedScannerController> logger)
    {
        _httpClientFactory = httpClientFactory;
        _logger = logger;
    }
    
    // Handle Base64 input (common in web applications)
    [HttpPost("scan-base64")]
    public ActionResult<ScanResult> ScanBase64([FromBody] Base64Request request)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }
        
        try
        {
            // Validate Base64 format
            var base64Data = request.ImageData;
            if (base64Data.Contains(","))
            {
                // Handle data URL format: "data:image/png;base64,..."
                base64Data = base64Data.Substring(base64Data.IndexOf(",") + 1);
            }
            
            var imageBytes = Convert.FromBase64String(base64Data);
            
            // Implement size validation
            if (imageBytes.Length > 10 * 1024 * 1024) // 10MB limit
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = "Image size exceeds 10MB limit"
                });
            }
            
            // Configure for web-uploaded images (often lower quality)
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(3),
                    new ContrastFilter(2),
                    new DeNoise()
                },
                TryInvertColor = true, // Handle inverted barcodes
                AutoRotate = true
            };
            
            var results = BarcodeReader.Read(imageBytes, options);
            return ProcessResults(results, "base64", request.FileName);
        }
        catch (FormatException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid Base64 format"
            });
        }
    }
    
    // Handle URL input (for cloud storage integration)
    [HttpPost("scan-url")]
    public async Task<ActionResult<ScanResult>> ScanFromUrl([FromBody] UrlScanRequest request)
    {
        if (!Uri.TryCreate(request.Url, UriKind.Absolute, out var uri))
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid URL format"
            });
        }
        
        // Validate URL domain (security measure)
        var allowedDomains = _configuration.GetSection("AllowedDomains").Get<string[]>() 
            ?? new[] { "blob.core.windows.net", "s3.amazonaws.com" };
        
        if (!allowedDomains.Any(domain => uri.Host.EndsWith(domain)))
        {
            _logger.LogWarning($"Rejected URL from unauthorized domain: {uri.Host}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "URL domain not authorized"
            });
        }
        
        try
        {
            using var httpClient = _httpClientFactory.CreateClient("BarcodeScanner");
            httpClient.Timeout = TimeSpan.FromSeconds(30);
            
            // Add headers to avoid being blocked
            httpClient.DefaultRequestHeaders.Add("User-Agent", "BarcodeScannerAPI/2.0");
            
            var response = await httpClient.GetAsync(uri);
            response.EnsureSuccessStatusCode();
            
            // Check content type
            var contentType = response.Content.Headers.ContentType?.MediaType;
            if (!IsValidContentType(contentType))
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = $"Unsupported content type: {contentType}"
                });
            }
            
            var imageBytes = await response.Content.ReadAsByteArrayAsync();
            
            // Use async processing for better scalability
            var results = await BarcodeReader.ReadAsync(imageBytes);
            return ProcessResults(results, "url", uri.ToString());
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, $"Failed to download from URL: {uri}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Failed to download image from URL"
            });
        }
        catch (TaskCanceledException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Download timeout - file too large or slow connection"
            });
        }
    }
    
    // Handle multi-page PDFs with page-specific processing
    [HttpPost("scan-pdf-advanced")]
    public async Task<ActionResult<PdfScanResult>> ScanPdfAdvanced([FromForm] PdfScanRequest request)
    {
        using var stream = new MemoryStream();
        await request.File.CopyToAsync(stream);
        
        var pdfOptions = new PdfBarcodeReaderOptions
        {
            Scale = request.Scale ?? 3,
            DPI = request.DPI ?? 300,
            PageNumbers = request.PageNumbers,
            Password = request.Password,
            MaxThreads = Math.Min(request.MaxThreads ?? 4, Environment.ProcessorCount)
        };
        
        // For large PDFs, process in chunks
        if (stream.Length > 50 * 1024 * 1024) // 50MB
        {
            _logger.LogInformation($"Large PDF detected ({stream.Length / 1024 / 1024}MB), using chunked processing");
            pdfOptions.MaxThreads = 2; // Reduce memory pressure
        }
        
        var results = BarcodeReader.ReadPdf(stream.ToArray(), pdfOptions);
        
        // Group results by page
        var pageResults = results.GroupBy(r => r.PageNumber)
            .OrderBy(g => g.Key)
            .Select(g => new PageBarcodeResult
            {
                PageNumber = g.Key,
                BarcodeCount = g.Count(),
                Barcodes = g.Select(b => new BarcodeData
                {
                    Value = b.Value,
                    Format = b.BarcodeType.ToString(),
                    Confidence = b.Confidence,
                    Location = b.Bounds
                }).ToList()
            }).ToList();
        
        return Ok(new PdfScanResult
        {
            Success = true,
            TotalPages = pageResults.Count,
            TotalBarcodes = results.Count(),
            PageResults = pageResults,
            RequestId = Guid.NewGuid().ToString()
        });
    }
    
    // Handle damaged or low-quality barcodes
    [HttpPost("scan-damaged")]
    public async Task<ActionResult<ScanResult>> ScanDamagedBarcode([FromForm] IFormFile file)
    {
        using var stream = new MemoryStream();
        await file.CopyToAsync(stream);
        
        // Aggressive image correction for damaged barcodes
        var options = new BarcodeReaderOptions
        {
            Speed = ReadingSpeed.ExtremeDetail,
            ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(4),
                new ContrastFilter(3),
                new BrightnessFilter(1.5f),
                new BinaryThresholdFilter(128),
                new DeNoise(3)
            },
            TryInvertColor = true,
            AutoRotate = true,
            UseCode39ExtendedMode = true,
            RemoveFalsePositive = false, // Accept lower confidence
            Confidence = ConfidenceLevel.Low
        };
        
        var results = BarcodeReader.Read(stream.ToArray(), options);
        
        // If still no results, try with different threshold
        if (!results.Any())
        {
            options.ImageFilters = new ImageFilterCollection
            {
                new AdaptiveThresholdFilter(9),
                new MedianFilter(3),
                new Dilate(1)
            };
            
            results = BarcodeReader.Read(stream.ToArray(), options);
        }
        
        return ProcessResults(results, "damaged", file.FileName);
    }
    
    private bool IsValidContentType(string contentType)
    {
        var validTypes = new[]
        {
            "image/jpeg", "image/jpg", "image/png", "image/gif",
            "image/tiff", "image/bmp", "application/pdf"
        };
        return validTypes.Contains(contentType?.ToLower());
    }
    
    private ActionResult<ScanResult> ProcessResults(BarcodeResults results, string source, string identifier)
    {
        var scanResult = new ScanResult
        {
            Metadata = new Dictionary<string, object>
            {
                ["Source"] = source,
                ["Identifier"] = identifier,
                ["ProcessedAt"] = DateTime.UtcNow
            }
        };
        
        if (results.Any())
        {
            scanResult.Success = true;
            scanResult.Barcodes = results.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList();
            
            // Log low confidence results for quality monitoring
            var lowConfidence = results.Where(r => r.Confidence < 70).ToList();
            if (lowConfidence.Any())
            {
                _logger.LogWarning($"Low confidence barcodes detected: {lowConfidence.Count} of {results.Count()} from {identifier}");
            }
        }
        else
        {
            scanResult.Success = false;
            scanResult.ErrorMessage = "No barcodes detected";
        }
        
        return Ok(scanResult);
    }
}

// Request models
public class Base64Request
{
    [Required]
    public string ImageData { get; set; }
    public string FileName { get; set; }
}

public class UrlScanRequest
{
    [Required]
    [Url]
    public string Url { get; set; }
}

public class PdfScanRequest
{
    [Required]
    public IFormFile File { get; set; }
    public int? Scale { get; set; }
    public int? DPI { get; set; }
    public int[] PageNumbers { get; set; }
    public string Password { get; set; }
    public int? MaxThreads { get; set; }
}

// Response models
public class PdfScanResult : ScanResult
{
    public int TotalPages { get; set; }
    public int TotalBarcodes { get; set; }
    public List<PageBarcodeResult> PageResults { get; set; }
}

public class PageBarcodeResult
{
    public int PageNumber { get; set; }
    public int BarcodeCount { get; set; }
    public List<BarcodeData> Barcodes { get; set; }
}

// Extended controller with multiple input handlers
[ApiController]
[Route("api/v1/[controller]")]
[Authorize]
public class AdvancedScannerController : ControllerBase
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly ILogger<AdvancedScannerController> _logger;
    
    public AdvancedScannerController(
        IHttpClientFactory httpClientFactory, 
        ILogger<AdvancedScannerController> logger)
    {
        _httpClientFactory = httpClientFactory;
        _logger = logger;
    }
    
    // Handle Base64 input (common in web applications)
    [HttpPost("scan-base64")]
    public ActionResult<ScanResult> ScanBase64([FromBody] Base64Request request)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }
        
        try
        {
            // Validate Base64 format
            var base64Data = request.ImageData;
            if (base64Data.Contains(","))
            {
                // Handle data URL format: "data:image/png;base64,..."
                base64Data = base64Data.Substring(base64Data.IndexOf(",") + 1);
            }
            
            var imageBytes = Convert.FromBase64String(base64Data);
            
            // Implement size validation
            if (imageBytes.Length > 10 * 1024 * 1024) // 10MB limit
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = "Image size exceeds 10MB limit"
                });
            }
            
            // Configure for web-uploaded images (often lower quality)
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(3),
                    new ContrastFilter(2),
                    new DeNoise()
                },
                TryInvertColor = true, // Handle inverted barcodes
                AutoRotate = true
            };
            
            var results = BarcodeReader.Read(imageBytes, options);
            return ProcessResults(results, "base64", request.FileName);
        }
        catch (FormatException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid Base64 format"
            });
        }
    }
    
    // Handle URL input (for cloud storage integration)
    [HttpPost("scan-url")]
    public async Task<ActionResult<ScanResult>> ScanFromUrl([FromBody] UrlScanRequest request)
    {
        if (!Uri.TryCreate(request.Url, UriKind.Absolute, out var uri))
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid URL format"
            });
        }
        
        // Validate URL domain (security measure)
        var allowedDomains = _configuration.GetSection("AllowedDomains").Get<string[]>() 
            ?? new[] { "blob.core.windows.net", "s3.amazonaws.com" };
        
        if (!allowedDomains.Any(domain => uri.Host.EndsWith(domain)))
        {
            _logger.LogWarning($"Rejected URL from unauthorized domain: {uri.Host}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "URL domain not authorized"
            });
        }
        
        try
        {
            using var httpClient = _httpClientFactory.CreateClient("BarcodeScanner");
            httpClient.Timeout = TimeSpan.FromSeconds(30);
            
            // Add headers to avoid being blocked
            httpClient.DefaultRequestHeaders.Add("User-Agent", "BarcodeScannerAPI/2.0");
            
            var response = await httpClient.GetAsync(uri);
            response.EnsureSuccessStatusCode();
            
            // Check content type
            var contentType = response.Content.Headers.ContentType?.MediaType;
            if (!IsValidContentType(contentType))
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = $"Unsupported content type: {contentType}"
                });
            }
            
            var imageBytes = await response.Content.ReadAsByteArrayAsync();
            
            // Use async processing for better scalability
            var results = await BarcodeReader.ReadAsync(imageBytes);
            return ProcessResults(results, "url", uri.ToString());
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, $"Failed to download from URL: {uri}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Failed to download image from URL"
            });
        }
        catch (TaskCanceledException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Download timeout - file too large or slow connection"
            });
        }
    }
    
    // Handle multi-page PDFs with page-specific processing
    [HttpPost("scan-pdf-advanced")]
    public async Task<ActionResult<PdfScanResult>> ScanPdfAdvanced([FromForm] PdfScanRequest request)
    {
        using var stream = new MemoryStream();
        await request.File.CopyToAsync(stream);
        
        var pdfOptions = new PdfBarcodeReaderOptions
        {
            Scale = request.Scale ?? 3,
            DPI = request.DPI ?? 300,
            PageNumbers = request.PageNumbers,
            Password = request.Password,
            MaxThreads = Math.Min(request.MaxThreads ?? 4, Environment.ProcessorCount)
        };
        
        // For large PDFs, process in chunks
        if (stream.Length > 50 * 1024 * 1024) // 50MB
        {
            _logger.LogInformation($"Large PDF detected ({stream.Length / 1024 / 1024}MB), using chunked processing");
            pdfOptions.MaxThreads = 2; // Reduce memory pressure
        }
        
        var results = BarcodeReader.ReadPdf(stream.ToArray(), pdfOptions);
        
        // Group results by page
        var pageResults = results.GroupBy(r => r.PageNumber)
            .OrderBy(g => g.Key)
            .Select(g => new PageBarcodeResult
            {
                PageNumber = g.Key,
                BarcodeCount = g.Count(),
                Barcodes = g.Select(b => new BarcodeData
                {
                    Value = b.Value,
                    Format = b.BarcodeType.ToString(),
                    Confidence = b.Confidence,
                    Location = b.Bounds
                }).ToList()
            }).ToList();
        
        return Ok(new PdfScanResult
        {
            Success = true,
            TotalPages = pageResults.Count,
            TotalBarcodes = results.Count(),
            PageResults = pageResults,
            RequestId = Guid.NewGuid().ToString()
        });
    }
    
    // Handle damaged or low-quality barcodes
    [HttpPost("scan-damaged")]
    public async Task<ActionResult<ScanResult>> ScanDamagedBarcode([FromForm] IFormFile file)
    {
        using var stream = new MemoryStream();
        await file.CopyToAsync(stream);
        
        // Aggressive image correction for damaged barcodes
        var options = new BarcodeReaderOptions
        {
            Speed = ReadingSpeed.ExtremeDetail,
            ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(4),
                new ContrastFilter(3),
                new BrightnessFilter(1.5f),
                new BinaryThresholdFilter(128),
                new DeNoise(3)
            },
            TryInvertColor = true,
            AutoRotate = true,
            UseCode39ExtendedMode = true,
            RemoveFalsePositive = false, // Accept lower confidence
            Confidence = ConfidenceLevel.Low
        };
        
        var results = BarcodeReader.Read(stream.ToArray(), options);
        
        // If still no results, try with different threshold
        if (!results.Any())
        {
            options.ImageFilters = new ImageFilterCollection
            {
                new AdaptiveThresholdFilter(9),
                new MedianFilter(3),
                new Dilate(1)
            };
            
            results = BarcodeReader.Read(stream.ToArray(), options);
        }
        
        return ProcessResults(results, "damaged", file.FileName);
    }
    
    private bool IsValidContentType(string contentType)
    {
        var validTypes = new[]
        {
            "image/jpeg", "image/jpg", "image/png", "image/gif",
            "image/tiff", "image/bmp", "application/pdf"
        };
        return validTypes.Contains(contentType?.ToLower());
    }
    
    private ActionResult<ScanResult> ProcessResults(BarcodeResults results, string source, string identifier)
    {
        var scanResult = new ScanResult
        {
            Metadata = new Dictionary<string, object>
            {
                ["Source"] = source,
                ["Identifier"] = identifier,
                ["ProcessedAt"] = DateTime.UtcNow
            }
        };
        
        if (results.Any())
        {
            scanResult.Success = true;
            scanResult.Barcodes = results.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList();
            
            // Log low confidence results for quality monitoring
            var lowConfidence = results.Where(r => r.Confidence < 70).ToList();
            if (lowConfidence.Any())
            {
                _logger.LogWarning($"Low confidence barcodes detected: {lowConfidence.Count} of {results.Count()} from {identifier}");
            }
        }
        else
        {
            scanResult.Success = false;
            scanResult.ErrorMessage = "No barcodes detected";
        }
        
        return Ok(scanResult);
    }
}

// Request models
public class Base64Request
{
    [Required]
    public string ImageData { get; set; }
    public string FileName { get; set; }
}

public class UrlScanRequest
{
    [Required]
    [Url]
    public string Url { get; set; }
}

public class PdfScanRequest
{
    [Required]
    public IFormFile File { get; set; }
    public int? Scale { get; set; }
    public int? DPI { get; set; }
    public int[] PageNumbers { get; set; }
    public string Password { get; set; }
    public int? MaxThreads { get; set; }
}

// Response models
public class PdfScanResult : ScanResult
{
    public int TotalPages { get; set; }
    public int TotalBarcodes { get; set; }
    public List<PageBarcodeResult> PageResults { get; set; }
}

public class PageBarcodeResult
{
    public int PageNumber { get; set; }
    public int BarcodeCount { get; set; }
    public List<BarcodeData> Barcodes { get; set; }
}

public class OptimizedScannerService
{
    private readonly ILogger<OptimizedScannerService> _logger;
    private readonly IMemoryCache _cache;
    
    public OptimizedScannerService(ILogger<OptimizedScannerService> logger, IMemoryCache cache)
    {
        _logger = logger;
        _cache = cache;
    }
    
    // Performance-optimized scanning with caching
    public async Task<ScanResult> ScanWithOptimizationsAsync(byte[] imageData, string cacheKey = null)
    {
        // Check cache for repeat scans
        if (!string.IsNullOrEmpty(cacheKey))
        {
            if (_cache.TryGetValue(cacheKey, out ScanResult cachedResult))
            {
                _logger.LogInformation($"Cache hit for {cacheKey}");
                cachedResult.Metadata["CacheHit"] = true;
                return cachedResult;
            }
        }
        
        // Determine optimal settings based on image characteristics
        var settings = await DetermineOptimalSettingsAsync(imageData);
        
        // Apply region-specific scanning if applicable
        if (settings.UseRegionScanning)
        {
            return await ScanWithRegionsAsync(imageData, settings);
        }
        
        // Standard optimized scanning
        var results = await BarcodeReader.ReadAsync(imageData, settings.Options);
        var scanResult = BuildScanResult(results);
        
        // Cache successful results
        if (!string.IsNullOrEmpty(cacheKey) && scanResult.Success)
        {
            _cache.Set(cacheKey, scanResult, TimeSpan.FromMinutes(5));
        }
        
        return scanResult;
    }
    
    // Intelligent settings determination
    private async Task<ScanSettings> DetermineOptimalSettingsAsync(byte[] imageData)
    {
        var settings = new ScanSettings();
        
        // Quick analysis of image properties
        using var ms = new MemoryStream(imageData);
        using var image = Image.FromStream(ms);
        
        var width = image.Width;
        var height = image.Height;
        var aspectRatio = (double)width / height;
        
        _logger.LogInformation($"Image analysis: {width}x{height}, ratio: {aspectRatio:F2}");
        
        // High-resolution images can use faster scanning
        if (width > 2000 && height > 2000)
        {
            settings.Options.Speed = ReadingSpeed.Faster;
            settings.Options.ExpectBarcodeTypes = BarcodeEncoding.QRCode | BarcodeEncoding.Code128;
        }
        // Low-resolution needs more processing
        else if (width < 800 || height < 800)
        {
            settings.Options.Speed = ReadingSpeed.ExtremeDetail;
            settings.Options.ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(3),
                new ContrastFilter(2)
            };
        }
        else
        {
            settings.Options.Speed = ReadingSpeed.Balanced;
        }
        
        // Detect if image might contain multiple barcodes based on aspect ratio
        if (aspectRatio > 2 || aspectRatio < 0.5)
        {
            settings.Options.ExpectMultipleBarcodes = true;
            settings.UseRegionScanning = true;
        }
        
        // Enable rotation correction for potentially skewed images
        settings.Options.AutoRotate = true;
        
        return settings;
    }
    
    // Region-based scanning for large images
    private async Task<ScanResult> ScanWithRegionsAsync(byte[] imageData, ScanSettings settings)
    {
        var allResults = new List<BarcodeResult>();
        using var ms = new MemoryStream(imageData);
        using var image = Image.FromStream(ms);
        
        // Define scanning regions for common document layouts
        var regions = new[]
        {
            new Rectangle(0, 0, image.Width / 2, image.Height / 2), // Top-left
            new Rectangle(image.Width / 2, 0, image.Width / 2, image.Height / 2), // Top-right
            new Rectangle(0, image.Height / 2, image.Width / 2, image.Height / 2), // Bottom-left
            new Rectangle(image.Width / 2, image.Height / 2, image.Width / 2, image.Height / 2), // Bottom-right
            new Rectangle(image.Width / 4, image.Height / 4, image.Width / 2, image.Height / 2) // Center
        };
        
        var tasks = regions.Select(async region =>
        {
            var regionOptions = new BarcodeReaderOptions
            {
                CropArea = region,
                Speed = ReadingSpeed.Faster,
                ExpectMultipleBarcodes = false
            };
            
            try
            {
                return await BarcodeReader.ReadAsync(imageData, regionOptions);
            }
            catch (Exception ex)
            {
                _logger.LogWarning($"Region scan failed: {ex.Message}");
                return new BarcodeResult[0];
            }
        });
        
        var regionResults = await Task.WhenAll(tasks);
        
        // Combine and deduplicate results
        var uniqueResults = regionResults
            .SelectMany(r => r)
            .GroupBy(r => r.Value)
            .Select(g => g.OrderByDescending(r => r.Confidence).First())
            .ToList();
        
        return BuildScanResult(uniqueResults);
    }
    
    // Adaptive quality enhancement
    public async Task<ScanResult> ScanWithAdaptiveEnhancementAsync(byte[] imageData)
    {
        var attempts = new List<Func<Task<BarcodeResults>>>
        {
            // Attempt 1: Fast scan
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Faster,
                RemoveFalsePositive = true
            }),
            
            // Attempt 2: Standard scan with basic filters
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ImageFilters = new ImageFilterCollection
                {
                    new ContrastFilter(1.5f),
                    new SharpenFilter(1)
                },
                TryInvertColor = true
            }),
            
            // Attempt 3: Detailed scan with aggressive filtering
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new AdaptiveThresholdFilter(11),
                    new DeNoise(2),
                    new MedianFilter(3)
                },
                AutoRotate = true,
                Confidence = ConfidenceLevel.Low
            }),
            
            // Attempt 4: Extreme processing for damaged barcodes
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.ExtremeDetail,
                ImageFilters = new ImageFilterCollection
                {
                    new BinaryThresholdFilter(100),
                    new Erode(1),
                    new Dilate(2),
                    new SharpenFilter(4)
                },
                RemoveFalsePositive = false,
                UseCode39ExtendedMode = true,
                TryInvertColor = true
            })
        };
        
        foreach (var (attempt, index) in attempts.Select((a, i) => (a, i)))
        {
            var stopwatch = Stopwatch.StartNew();
            var results = await attempt();
            stopwatch.Stop();
            
            _logger.LogInformation($"Attempt {index + 1} took {stopwatch.ElapsedMilliseconds}ms, found {results.Count()} barcodes");
            
            if (results.Any())
            {
                var scanResult = BuildScanResult(results);
                scanResult.Metadata["AttemptNumber"] = index + 1;
                scanResult.Metadata["ProcessingStrategy"] = GetStrategyName(index);
                return scanResult;
            }
        }
        
        return new ScanResult
        {
            Success = false,
            ErrorMessage = "No barcodes found after all enhancement attempts"
        };
    }
    
    // Machine learning confidence optimization
    public class MLOptimizedScanner
    {
        private readonly Dictionary<string, double> _formatConfidenceThresholds = new()
        {
            { "QRCode", 85.0 },
            { "Code128", 90.0 },
            { "Code39", 88.0 },
            { "DataMatrix", 87.0 },
            { "EAN13", 92.0 },
            { "PDF417", 86.0 }
        };
        
        public async Task<ScanResult> ScanWithMLConfidenceAsync(byte[] imageData, string expectedFormat = null)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                Confidence = ConfidenceLevel.Optional
            };
            
            // If we know the expected format, improve for it
            if (!string.IsNullOrEmpty(expectedFormat) && 
                Enum.TryParse<BarcodeEncoding>(expectedFormat, out var encoding))
            {
                options.ExpectBarcodeTypes = encoding;
            }
            
            var results = await BarcodeReader.ReadAsync(imageData, options);
            
            // Apply ML confidence filtering
            var confidenceThreshold = expectedFormat != null && 
                _formatConfidenceThresholds.ContainsKey(expectedFormat)
                ? _formatConfidenceThresholds[expectedFormat]
                : 80.0;
            
            var highConfidenceResults = results
                .Where(r => r.Confidence >= confidenceThreshold)
                .ToList();
            
            if (highConfidenceResults.Any())
            {
                return BuildScanResult(highConfidenceResults);
            }
            
            // If no high-confidence results, include lower confidence with warnings
            var lowConfidenceResults = results
                .Where(r => r.Confidence < confidenceThreshold)
                .ToList();
            
            if (lowConfidenceResults.Any())
            {
                var result = BuildScanResult(lowConfidenceResults);
                result.Metadata["Warning"] = "Low confidence results - manual verification recommended";
                result.Metadata["MinConfidence"] = lowConfidenceResults.Min(r => r.Confidence);
                return result;
            }
            
            return new ScanResult
            {
                Success = false,
                ErrorMessage = "No barcodes met confidence threshold"
            };
        }
    }
    
    private ScanResult BuildScanResult(IEnumerable<BarcodeResult> results)
    {
        var resultList = results.ToList();
        return new ScanResult
        {
            Success = true,
            Barcodes = resultList.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList(),
            Metadata = new Dictionary<string, object>
            {
                ["TotalFound"] = resultList.Count,
                ["AverageConfidence"] = resultList.Average(r => r.Confidence),
                ["Formats"] = resultList.Select(r => r.BarcodeType.ToString()).Distinct().ToArray()
            }
        };
    }
    
    private string GetStrategyName(int attemptIndex)
    {
        return attemptIndex switch
        {
            0 => "FastScan",
            1 => "StandardEnhanced",
            2 => "DetailedFiltering",
            3 => "ExtremeDamageRecovery",
            _ => "Unknown"
        };
    }
}

// Supporting classes
public class ScanSettings
{
    public BarcodeReaderOptions Options { get; set; } = new BarcodeReaderOptions();
    public bool UseRegionScanning { get; set; }
    public List<Rectangle> CustomRegions { get; set; }
}

// Benchmark service for performance testing
public class BenchmarkService
{
    private readonly ILogger<BenchmarkService> _logger;
    
    public async Task<BenchmarkResult> BenchmarkSettingsAsync(byte[] testImage, int iterations = 10)
    {
        var results = new Dictionary<string, BenchmarkData>();
        
        var testConfigurations = new Dictionary<string, BarcodeReaderOptions>
        {
            ["Fastest"] = new() { Speed = ReadingSpeed.Faster },
            ["Balanced"] = new() { Speed = ReadingSpeed.Balanced },
            ["Detailed"] = new() { Speed = ReadingSpeed.Detailed },
            ["Parallel"] = new() { Speed = ReadingSpeed.Balanced, Multithreaded = true, MaxParallelThreads = 4 },
            ["Filtered"] = new() 
            { 
                Speed = ReadingSpeed.Balanced, 
                ImageFilters = new ImageFilterCollection { new SharpenFilter(2), new ContrastFilter(1.5f) } 
            }
        };
        
        foreach (var config in testConfigurations)
        {
            var times = new List<long>();
            var successCount = 0;
            
            for (int i = 0; i < iterations; i++)
            {
                var sw = Stopwatch.StartNew();
                var scanResults = await BarcodeReader.ReadAsync(testImage, config.Value);
                sw.Stop();
                
                times.Add(sw.ElapsedMilliseconds);
                if (scanResults.Any()) successCount++;
                
                // Small delay between tests
                await Task.Delay(100);
            }
            
            results[config.Key] = new BenchmarkData
            {
                AverageMs = times.Average(),
                MinMs = times.Min(),
                MaxMs = times.Max(),
                SuccessRate = (double)successCount / iterations * 100
            };
        }
        
        return new BenchmarkResult { Results = results };
    }
}

public class BenchmarkData
{
    public double AverageMs { get; set; }
    public long MinMs { get; set; }
    public long MaxMs { get; set; }
    public double SuccessRate { get; set; }
}

public class BenchmarkResult
{
    public Dictionary<string, BenchmarkData> Results { get; set; }
}