// TesseractOcrMaui: wired to MAUI host — cannot escape to a shared library
// This code compiles only inside a .NET MAUI application
public class OcrService
{
    private readonly ITesseract _tesseract; // resolved from MAUI DI — no other source exists

    public OcrService(ITesseract tesseract) { _tesseract = tesseract; }

    public async Task<string> ReadAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng"); // traineddata must be bundled as MauiAsset
        var result = await _tesseract.RecognizeTextAsync(imagePath);
        return result.Success ? result.RecognizedText : string.Empty;
    }
    // Cannot reference this class from ASP.NET Core, Azure Functions, or Docker
}

// TesseractOcrMaui: wired to MAUI host — cannot escape to a shared library
// This code compiles only inside a .NET MAUI application
public class OcrService
{
    private readonly ITesseract _tesseract; // resolved from MAUI DI — no other source exists

    public OcrService(ITesseract tesseract) { _tesseract = tesseract; }

    public async Task<string> ReadAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng"); // traineddata must be bundled as MauiAsset
        var result = await _tesseract.RecognizeTextAsync(imagePath);
        return result.Success ? result.RecognizedText : string.Empty;
    }
    // Cannot reference this class from ASP.NET Core, Azure Functions, or Docker
}

// IronOCR: plain instantiable class — compiles in any .NET project type
public class OcrService
{
    private readonly IronTesseract _ocr = new IronTesseract(); // no DI, no MAUI host

    public string Read(string imagePath)
    {
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return _ocr.Read(input).Text;
    }
    // Place this in a netstandard2.1 library — reference from MAUI, API, and Functions together
}

// IronOCR: plain instantiable class — compiles in any .NET project type
public class OcrService
{
    private readonly IronTesseract _ocr = new IronTesseract(); // no DI, no MAUI host

    public string Read(string imagePath)
    {
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return _ocr.Read(input).Text;
    }
    // Place this in a netstandard2.1 library — reference from MAUI, API, and Functions together
}

dotnet remove package TesseractOcrMaui

dotnet remove package TesseractOcrMaui

// Before (TesseractOcrMaui)
using TesseractOcrMaui;
using TesseractOcrMaui.Results;
using Microsoft.Maui.Storage;

// After (IronOCR)
using IronOcr;

// Before (TesseractOcrMaui)
using TesseractOcrMaui;
using TesseractOcrMaui.Results;
using Microsoft.Maui.Storage;

// After (IronOCR)
using IronOcr;

// MauiProgram.cs — OCR engine registered here; nowhere else resolves it
public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder.UseMauiApp<App>();

        // Binds OCR to MAUI DI — no standalone path exists after this
        builder.Services.AddTesseractOcr();

        return builder.Build();
    }
}

// Any class that needs OCR must receive ITesseract from the MAUI container
public class InvoicePageViewModel
{
    private readonly ITesseract _tesseract;

    public InvoicePageViewModel(ITesseract tesseract)
    {
        _tesseract = tesseract; // fails to construct outside MAUI host
    }

    public async Task<string> ScanInvoiceAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var result = await _tesseract.RecognizeTextAsync(imagePath);
        return result.RecognizedText ?? string.Empty;
    }
}

// MauiProgram.cs — OCR engine registered here; nowhere else resolves it
public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder.UseMauiApp<App>();

        // Binds OCR to MAUI DI — no standalone path exists after this
        builder.Services.AddTesseractOcr();

        return builder.Build();
    }
}

// Any class that needs OCR must receive ITesseract from the MAUI container
public class InvoicePageViewModel
{
    private readonly ITesseract _tesseract;

    public InvoicePageViewModel(ITesseract tesseract)
    {
        _tesseract = tesseract; // fails to construct outside MAUI host
    }

    public async Task<string> ScanInvoiceAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var result = await _tesseract.RecognizeTextAsync(imagePath);
        return result.RecognizedText ?? string.Empty;
    }
}

// MauiProgram.cs — license only; no DI registration needed
public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder.UseMauiApp<App>();

        // One-line initialization — works for all project types
        IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

        return builder.Build();
    }
}

// No constructor injection needed — IronTesseract instantiates directly
public class InvoicePageViewModel
{
    public string ScanInvoice(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return ocr.Read(input).Text;
    }
}

// MauiProgram.cs — license only; no DI registration needed
public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder.UseMauiApp<App>();

        // One-line initialization — works for all project types
        IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

        return builder.Build();
    }
}

// No constructor injection needed — IronTesseract instantiates directly
public class InvoicePageViewModel
{
    public string ScanInvoice(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return ocr.Read(input).Text;
    }
}

// This service CANNOT be extracted to a shared library.
// It compiles only in a project that references TesseractOcrMaui,
// which only has MAUI platform targets.
//
// Result: every non-MAUI project must use a different OCR library,
// duplicating language config, error handling, and accuracy tuning.

public class DocumentOcrService
{
    private readonly ITesseract _tesseract; // MAUI DI only

    public DocumentOcrService(ITesseract tesseract)
    {
        _tesseract = tesseract;
    }

    public async Task<string> ProcessDocumentAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var result = await _tesseract.RecognizeTextAsync(imagePath);
        return result.Success ? result.RecognizedText : string.Empty;
    }
    // Server team writes their own version using a different library
    // Two codebases, two accuracy profiles, two maintenance tracks
}

// This service CANNOT be extracted to a shared library.
// It compiles only in a project that references TesseractOcrMaui,
// which only has MAUI platform targets.
//
// Result: every non-MAUI project must use a different OCR library,
// duplicating language config, error handling, and accuracy tuning.

public class DocumentOcrService
{
    private readonly ITesseract _tesseract; // MAUI DI only

    public DocumentOcrService(ITesseract tesseract)
    {
        _tesseract = tesseract;
    }

    public async Task<string> ProcessDocumentAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var result = await _tesseract.RecognizeTextAsync(imagePath);
        return result.Success ? result.RecognizedText : string.Empty;
    }
    // Server team writes their own version using a different library
    // Two codebases, two accuracy profiles, two maintenance tracks
}

// Place this in: MyCompany.OcrCore (net8.0 or netstandard2.1 class library)
// Reference from: MyCompany.MauiApp, MyCompany.Api, MyCompany.BatchWorker

using IronOcr;

namespace MyCompany.OcrCore
{
    public class DocumentOcrService
    {
        private readonly IronTesseract _ocr;

        public DocumentOcrService()
        {
            _ocr = new IronTesseract();
        }

        public string ProcessDocument(string imagePath)
        {
            using var input = new OcrInput();
            input.LoadImage(imagePath);
            input.Deskew();
            input.DeNoise();
            return _ocr.Read(input).Text;
        }

        public string ProcessDocumentFromBytes(byte[] imageData)
        {
            using var input = new OcrInput();
            input.LoadImage(imageData);
            input.Deskew();
            input.DeNoise();
            return _ocr.Read(input).Text;
        }

        public string ProcessDocumentFromStream(Stream imageStream)
        {
            using var input = new OcrInput();
            input.LoadImage(imageStream);
            return _ocr.Read(input).Text;
        }
    }
}

// Place this in: MyCompany.OcrCore (net8.0 or netstandard2.1 class library)
// Reference from: MyCompany.MauiApp, MyCompany.Api, MyCompany.BatchWorker

using IronOcr;

namespace MyCompany.OcrCore
{
    public class DocumentOcrService
    {
        private readonly IronTesseract _ocr;

        public DocumentOcrService()
        {
            _ocr = new IronTesseract();
        }

        public string ProcessDocument(string imagePath)
        {
            using var input = new OcrInput();
            input.LoadImage(imagePath);
            input.Deskew();
            input.DeNoise();
            return _ocr.Read(input).Text;
        }

        public string ProcessDocumentFromBytes(byte[] imageData)
        {
            using var input = new OcrInput();
            input.LoadImage(imageData);
            input.Deskew();
            input.DeNoise();
            return _ocr.Read(input).Text;
        }

        public string ProcessDocumentFromStream(Stream imageStream)
        {
            using var input = new OcrInput();
            input.LoadImage(imageStream);
            return _ocr.Read(input).Text;
        }
    }
}

// ASP.NET CoreWeb API — TesseractOcrMauiCANNOT be used here.
// The package has no net8.0 or netstandard target.
// Referencing it produces: "The given project does not support targeting net8.0-ios/android/windows."
//
// Team is forced to add a second OCR library — Tesseract charlesw wrapper,
// a cloud API, or another solution — creating a split codebase.

[ApiController]
[Route("api/[controller]")]
public class DocumentsController : ControllerBase
{
    // Cannot inject ITesseract here — no MAUI host, no MAUI DI container
    // Must use a completely different OCR library for server-side processing
}

// ASP.NET CoreWeb API — TesseractOcrMauiCANNOT be used here.
// The package has no net8.0 or netstandard target.
// Referencing it produces: "The given project does not support targeting net8.0-ios/android/windows."
//
// Team is forced to add a second OCR library — Tesseract charlesw wrapper,
// a cloud API, or another solution — creating a split codebase.

[ApiController]
[Route("api/[controller]")]
public class DocumentsController : ControllerBase
{
    // Cannot inject ITesseract here — no MAUI host, no MAUI DI container
    // Must use a completely different OCR library for server-side processing
}

// ASP.NET Core—IronOCR works without modification
using IronOcr;
using Microsoft.AspNetCore.Mvc;

[ApiController]
[Route("api/[controller]")]
public class DocumentsController : ControllerBase
{
    [HttpPost("extract-text")]
    public async Task<IActionResult> ExtractText(IFormFile file)
    {
        if (file == null || file.Length == 0)
            return BadRequest("No file uploaded.");

        var ocr = new IronTesseract();
        using var input = new OcrInput();

        // Load directly from the upload stream — no temp files
        using var stream = file.OpenReadStream();

        if (file.ContentType == "application/pdf")
            input.LoadPdf(stream);
        else
            input.LoadImage(stream);

        input.Deskew();
        input.DeNoise();

        var result = ocr.Read(input);

        return Ok(new
        {
            text = result.Text,
            confidence = result.Confidence,
            pageCount = result.Pages.Count()
        });
    }

    [HttpPost("extract-text-batch")]
    public async Task<IActionResult> ExtractTextBatch(List<IFormFile> files)
    {
        var results = new List<object>();

        // Thread-safe: create one IronTesseract per thread
        await Parallel.ForEachAsync(files, async (file, ct) =>
        {
            var ocr = new IronTesseract();
            using var input = new OcrInput();
            using var stream = file.OpenReadStream();
            input.LoadImage(stream);
            var result = ocr.Read(input);

            lock (results)
            {
                results.Add(new { file = file.FileName, text = result.Text });
            }
        });

        return Ok(results);
    }
}

// ASP.NET Core—IronOCR works without modification
using IronOcr;
using Microsoft.AspNetCore.Mvc;

[ApiController]
[Route("api/[controller]")]
public class DocumentsController : ControllerBase
{
    [HttpPost("extract-text")]
    public async Task<IActionResult> ExtractText(IFormFile file)
    {
        if (file == null || file.Length == 0)
            return BadRequest("No file uploaded.");

        var ocr = new IronTesseract();
        using var input = new OcrInput();

        // Load directly from the upload stream — no temp files
        using var stream = file.OpenReadStream();

        if (file.ContentType == "application/pdf")
            input.LoadPdf(stream);
        else
            input.LoadImage(stream);

        input.Deskew();
        input.DeNoise();

        var result = ocr.Read(input);

        return Ok(new
        {
            text = result.Text,
            confidence = result.Confidence,
            pageCount = result.Pages.Count()
        });
    }

    [HttpPost("extract-text-batch")]
    public async Task<IActionResult> ExtractTextBatch(List<IFormFile> files)
    {
        var results = new List<object>();

        // Thread-safe: create one IronTesseract per thread
        await Parallel.ForEachAsync(files, async (file, ct) =>
        {
            var ocr = new IronTesseract();
            using var input = new OcrInput();
            using var stream = file.OpenReadStream();
            input.LoadImage(stream);
            var result = ocr.Read(input);

            lock (results)
            {
                results.Add(new { file = file.FileName, text = result.Text });
            }
        });

        return Ok(results);
    }
}

// Attempting to share OCR logic across MAUI and non-MAUI targets
// requires platform-conditional compilation — a maintenance hazard

#if ANDROID || IOS || WINDOWS
// Only compile this block in MAUI targets
// Non-MAUI targets cannot reference TesseractOcrMauiat all
using TesseractOcrMaui;

public class PlatformOcrHandler
{
    private readonly ITesseract _tesseract;

    public PlatformOcrHandler(ITesseract tesseract)
    {
        _tesseract = tesseract;
    }

    public async Task<string> ProcessAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var r = await _tesseract.RecognizeTextAsync(imagePath);
        return r.RecognizedText ?? string.Empty;
    }
}
#else
// Server targets need a completely different implementation
public class PlatformOcrHandler
{
    public string ProcessAsync(string imagePath)
    {
        // Duplicate logic using a different library
        throw new PlatformNotSupportedException("Use server OCR library here");
    }
}
#endif

// Attempting to share OCR logic across MAUI and non-MAUI targets
// requires platform-conditional compilation — a maintenance hazard

#if ANDROID || IOS || WINDOWS
// Only compile this block in MAUI targets
// Non-MAUI targets cannot reference TesseractOcrMauiat all
using TesseractOcrMaui;

public class PlatformOcrHandler
{
    private readonly ITesseract _tesseract;

    public PlatformOcrHandler(ITesseract tesseract)
    {
        _tesseract = tesseract;
    }

    public async Task<string> ProcessAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var r = await _tesseract.RecognizeTextAsync(imagePath);
        return r.RecognizedText ?? string.Empty;
    }
}
#else
// Server targets need a completely different implementation
public class PlatformOcrHandler
{
    public string ProcessAsync(string imagePath)
    {
        // Duplicate logic using a different library
        throw new PlatformNotSupportedException("Use server OCR library here");
    }
}
#endif

// One implementation — no conditional compilation, no duplicate logic
using IronOcr;

public class PlatformOcrHandler
{
    // This class compiles identically for:
    // net8.0-android, net8.0-ios, net8.0-windows (MAUI targets)
    // net8.0 (server targets)
    // netstandard2.1 (shared library targets)

    public string Process(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        input.Deskew();
        return ocr.Read(input).Text;
    }
}

// Multi-target .csproj — no conditional package references needed
// <TargetFrameworks>net8.0;net8.0-android;net8.0-ios</TargetFrameworks>
// IronOcr resolves correctly for all three targets from one package reference

// One implementation — no conditional compilation, no duplicate logic
using IronOcr;

public class PlatformOcrHandler
{
    // This class compiles identically for:
    // net8.0-android, net8.0-ios, net8.0-windows (MAUI targets)
    // net8.0 (server targets)
    // netstandard2.1 (shared library targets)

    public string Process(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        input.Deskew();
        return ocr.Read(input).Text;
    }
}

// Multi-target .csproj — no conditional package references needed
// <TargetFrameworks>net8.0;net8.0-android;net8.0-ios</TargetFrameworks>
// IronOcr resolves correctly for all three targets from one package reference

// TesseractOcrMaui: flat text string only — no structure, no coordinates
public class TesseractMauiFormParser
{
    private readonly ITesseract _tesseract;

    public TesseractMauiFormParser(ITesseract tesseract)
    {
        _tesseract = tesseract;
    }

    public async Task<Dictionary<string, string>> ParseFormAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var result = await _tesseract.RecognizeTextAsync(imagePath);

        // result.RecognizedText is one flat string — no field positions
        // Parsing requires fragile line-splitting and regex heuristics
        var fields = new Dictionary<string, string>();
        var lines = result.RecognizedText?.Split('\n') ?? Array.Empty<string>();

        foreach (var line in lines)
        {
            // Hope the layout stays consistent enough to parse
            var parts = line.Split(':');
            if (parts.Length == 2)
                fields[parts[0].Trim()] = parts[1].Trim();
        }

        return fields;
        // No way to validate against expected field positions
        // No confidence per word — only document-level confidence
    }
}

// TesseractOcrMaui: flat text string only — no structure, no coordinates
public class TesseractMauiFormParser
{
    private readonly ITesseract _tesseract;

    public TesseractMauiFormParser(ITesseract tesseract)
    {
        _tesseract = tesseract;
    }

    public async Task<Dictionary<string, string>> ParseFormAsync(string imagePath)
    {
        await _tesseract.InitAsync("eng");
        var result = await _tesseract.RecognizeTextAsync(imagePath);

        // result.RecognizedText is one flat string — no field positions
        // Parsing requires fragile line-splitting and regex heuristics
        var fields = new Dictionary<string, string>();
        var lines = result.RecognizedText?.Split('\n') ?? Array.Empty<string>();

        foreach (var line in lines)
        {
            // Hope the layout stays consistent enough to parse
            var parts = line.Split(':');
            if (parts.Length == 2)
                fields[parts[0].Trim()] = parts[1].Trim();
        }

        return fields;
        // No way to validate against expected field positions
        // No confidence per word — only document-level confidence
    }
}

// IronOCR: full document structure with bounding boxes per word
using IronOcr;

public class IronOcrFormParser
{
    public List<WordLocation> ExtractWordsWithPositions(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);

        var result = ocr.Read(input);
        var wordLocations = new List<WordLocation>();

        foreach (var page in result.Pages)
        {
            foreach (var word in page.Words)
            {
                wordLocations.Add(new WordLocation
                {
                    Text = word.Text,
                    Confidence = word.Confidence,
                    X = word.X,
                    Y = word.Y,
                    Width = word.Width,
                    Height = word.Height
                });
            }
        }

        return wordLocations;
    }

    public FormData ParseStructuredForm(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        input.Deskew();

        var result = ocr.Read(input);
        var form = new FormData();

        foreach (var page in result.Pages)
        {
            foreach (var paragraph in page.Paragraphs)
            {
                // Use Y coordinate to identify form regions
                if (paragraph.Y < 200)
                    form.HeaderText += paragraph.Text + " ";
                else if (paragraph.Y > 800)
                    form.FooterText += paragraph.Text + " ";
                else
                    form.BodyLines.Add(paragraph.Text);
            }
        }

        form.OverallConfidence = result.Confidence;
        return form;
    }
}

public class WordLocation
{
    public string Text { get; set; }
    public float Confidence { get; set; }
    public int X { get; set; }
    public int Y { get; set; }
    public int Width { get; set; }
    public int Height { get; set; }
}

public class FormData
{
    public string HeaderText { get; set; } = string.Empty;
    public string FooterText { get; set; } = string.Empty;
    public List<string> BodyLines { get; set; } = new();
    public float OverallConfidence { get; set; }
}

// IronOCR: full document structure with bounding boxes per word
using IronOcr;

public class IronOcrFormParser
{
    public List<WordLocation> ExtractWordsWithPositions(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);

        var result = ocr.Read(input);
        var wordLocations = new List<WordLocation>();

        foreach (var page in result.Pages)
        {
            foreach (var word in page.Words)
            {
                wordLocations.Add(new WordLocation
                {
                    Text = word.Text,
                    Confidence = word.Confidence,
                    X = word.X,
                    Y = word.Y,
                    Width = word.Width,
                    Height = word.Height
                });
            }
        }

        return wordLocations;
    }

    public FormData ParseStructuredForm(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        input.Deskew();

        var result = ocr.Read(input);
        var form = new FormData();

        foreach (var page in result.Pages)
        {
            foreach (var paragraph in page.Paragraphs)
            {
                // Use Y coordinate to identify form regions
                if (paragraph.Y < 200)
                    form.HeaderText += paragraph.Text + " ";
                else if (paragraph.Y > 800)
                    form.FooterText += paragraph.Text + " ";
                else
                    form.BodyLines.Add(paragraph.Text);
            }
        }

        form.OverallConfidence = result.Confidence;
        return form;
    }
}

public class WordLocation
{
    public string Text { get; set; }
    public float Confidence { get; set; }
    public int X { get; set; }
    public int Y { get; set; }
    public int Width { get; set; }
    public int Height { get; set; }
}

public class FormData
{
    public string HeaderText { get; set; } = string.Empty;
    public string FooterText { get; set; } = string.Empty;
    public List<string> BodyLines { get; set; } = new();
    public float OverallConfidence { get; set; }
}

// Background processing is impossible with TesseractOcrMaui.
// IHostedService runs in a server context — TesseractOcrMauihas no server target.
// The MAUI async API exists, but there is nowhere to run it outside the MAUI app host.

public class DocumentBatchWorker : BackgroundService
{
    // ITesseract cannot be injected here — no MAUI DI in a hosted service
    // Attempting to reference TesseractOcrMauiwill fail to compile:
    // error: Package TesseractOcrMauidoes not support target net8.0
    protected override Task ExecuteAsync(CancellationToken stoppingToken)
    {
        throw new PlatformNotSupportedException(
            "TesseractOcrMaui has no server target. Use a different OCR library.");
    }
}

// Background processing is impossible with TesseractOcrMaui.
// IHostedService runs in a server context — TesseractOcrMauihas no server target.
// The MAUI async API exists, but there is nowhere to run it outside the MAUI app host.

public class DocumentBatchWorker : BackgroundService
{
    // ITesseract cannot be injected here — no MAUI DI in a hosted service
    // Attempting to reference TesseractOcrMauiwill fail to compile:
    // error: Package TesseractOcrMauidoes not support target net8.0
    protected override Task ExecuteAsync(CancellationToken stoppingToken)
    {
        throw new PlatformNotSupportedException(
            "TesseractOcrMaui has no server target. Use a different OCR library.");
    }
}

// IronOCR: hosted service background batch processor
using IronOcr;
using Microsoft.Extensions.Hosting;

public class DocumentBatchWorker : BackgroundService
{
    private readonly ILogger<DocumentBatchWorker> _logger;
    private readonly string _inputFolder;
    private readonly string _outputFolder;

    public DocumentBatchWorker(ILogger<DocumentBatchWorker> logger, IConfiguration config)
    {
        _logger = logger;
        _inputFolder = config["Ocr:InputFolder"];
        _outputFolder = config["Ocr:OutputFolder"];
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            var pendingFiles = Directory.GetFiles(_inputFolder, "*.pdf")
                .Concat(Directory.GetFiles(_inputFolder, "*.jpg"))
                .ToList();

            if (pendingFiles.Count > 0)
            {
                _logger.LogInformation("Processing {Count} documents.", pendingFiles.Count);

                // Thread-safe parallel processing — one IronTesseract per thread
                await Parallel.ForEachAsync(pendingFiles,
                    new ParallelOptions { MaxDegreeOfParallelism = 4, CancellationToken = stoppingToken },
                    async (filePath, ct) =>
                    {
                        await ProcessDocumentAsync(filePath, ct);
                    });
            }

            await Task.Delay(TimeSpan.FromSeconds(30), stoppingToken);
        }
    }

    private async Task ProcessDocumentAsync(string filePath, CancellationToken ct)
    {
        try
        {
            var ocr = new IronTesseract();
            using var input = new OcrInput();

            if (Path.GetExtension(filePath).Equals(".pdf", StringComparison.OrdinalIgnoreCase))
                input.LoadPdf(filePath);
            else
                input.LoadImage(filePath);

            input.Deskew();
            input.DeNoise();

            var result = await Task.Run(() => ocr.Read(input), ct);

            // Produce searchable PDF from the same OCR pass
            var outputPath = Path.Combine(_outputFolder,
                Path.GetFileNameWithoutExtension(filePath) + "_searchable.pdf");
            result.SaveAsSearchablePdf(outputPath);

            File.Delete(filePath); // move from input queue
            _logger.LogInformation("Processed {File}: {Confidence:F1}% confidence.", filePath, result.Confidence);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to process {File}.", filePath);
        }
    }
}

// IronOCR: hosted service background batch processor
using IronOcr;
using Microsoft.Extensions.Hosting;

public class DocumentBatchWorker : BackgroundService
{
    private readonly ILogger<DocumentBatchWorker> _logger;
    private readonly string _inputFolder;
    private readonly string _outputFolder;

    public DocumentBatchWorker(ILogger<DocumentBatchWorker> logger, IConfiguration config)
    {
        _logger = logger;
        _inputFolder = config["Ocr:InputFolder"];
        _outputFolder = config["Ocr:OutputFolder"];
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            var pendingFiles = Directory.GetFiles(_inputFolder, "*.pdf")
                .Concat(Directory.GetFiles(_inputFolder, "*.jpg"))
                .ToList();

            if (pendingFiles.Count > 0)
            {
                _logger.LogInformation("Processing {Count} documents.", pendingFiles.Count);

                // Thread-safe parallel processing — one IronTesseract per thread
                await Parallel.ForEachAsync(pendingFiles,
                    new ParallelOptions { MaxDegreeOfParallelism = 4, CancellationToken = stoppingToken },
                    async (filePath, ct) =>
                    {
                        await ProcessDocumentAsync(filePath, ct);
                    });
            }

            await Task.Delay(TimeSpan.FromSeconds(30), stoppingToken);
        }
    }

    private async Task ProcessDocumentAsync(string filePath, CancellationToken ct)
    {
        try
        {
            var ocr = new IronTesseract();
            using var input = new OcrInput();

            if (Path.GetExtension(filePath).Equals(".pdf", StringComparison.OrdinalIgnoreCase))
                input.LoadPdf(filePath);
            else
                input.LoadImage(filePath);

            input.Deskew();
            input.DeNoise();

            var result = await Task.Run(() => ocr.Read(input), ct);

            // Produce searchable PDF from the same OCR pass
            var outputPath = Path.Combine(_outputFolder,
                Path.GetFileNameWithoutExtension(filePath) + "_searchable.pdf");
            result.SaveAsSearchablePdf(outputPath);

            File.Delete(filePath); // move from input queue
            _logger.LogInformation("Processed {File}: {Confidence:F1}% confidence.", filePath, result.Confidence);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to process {File}.", filePath);
        }
    }
}

// Option A: Direct instantiation (recommended for most cases)
public class ScanPageViewModel
{
    public string ScanDocument(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return ocr.Read(input).Text;
    }
}

// Option B: Register IronTesseract in DI if your architecture requires it
// In MauiProgram.cs or Program.cs:
builder.Services.AddSingleton<IronTesseract>();

// Then inject normally:
public class ScanPageViewModel
{
    private readonly IronTesseract _ocr;
    public ScanPageViewModel(IronTesseract ocr) { _ocr = ocr; }

    public string ScanDocument(string imagePath)
    {
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return _ocr.Read(input).Text;
    }
}

// Option A: Direct instantiation (recommended for most cases)
public class ScanPageViewModel
{
    public string ScanDocument(string imagePath)
    {
        var ocr = new IronTesseract();
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return ocr.Read(input).Text;
    }
}

// Option B: Register IronTesseract in DI if your architecture requires it
// In MauiProgram.cs or Program.cs:
builder.Services.AddSingleton<IronTesseract>();

// Then inject normally:
public class ScanPageViewModel
{
    private readonly IronTesseract _ocr;
    public ScanPageViewModel(IronTesseract ocr) { _ocr = ocr; }

    public string ScanDocument(string imagePath)
    {
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return _ocr.Read(input).Text;
    }
}

# Delete traineddata assets
rm -rf Resources/Raw/tessdata

# Remove from .csproj (delete the MauiAsset ItemGroup):
# <ItemGroup>
#   <MauiAsset Include="Resources\Raw\tessdata\*.traineddata" />
# </ItemGroup>

# Install IronOCR language pack (if non-English language was needed)
dotnet add package IronOcr.Languages.French
dotnet add package IronOcr.Languages.German

# Delete traineddata assets
rm -rf Resources/Raw/tessdata

# Remove from .csproj (delete the MauiAsset ItemGroup):
# <ItemGroup>
#   <MauiAsset Include="Resources\Raw\tessdata\*.traineddata" />
# </ItemGroup>

# Install IronOCR language pack (if non-English language was needed)
dotnet add package IronOcr.Languages.French
dotnet add package IronOcr.Languages.German

// Before: initialization guard required before every OCR call
private bool _isInitialized = false;
private readonly SemaphoreSlim _initLock = new SemaphoreSlim(1, 1);

public async Task<string> GetTextAsync(string imagePath)
{
    await _initLock.WaitAsync();
    try
    {
        if (!_isInitialized)
        {
            await _tesseract.InitAsync("eng");
            _isInitialized = true;
        }
    }
    finally { _initLock.Release(); }

    var result = await _tesseract.RecognizeTextAsync(imagePath);
    return result.RecognizedText ?? string.Empty;
}

// After: no initialization, no guard, no semaphore
public string GetText(string imagePath)
{
    var ocr = new IronTesseract();
    using var input = new OcrInput();
    input.LoadImage(imagePath);
    return ocr.Read(input).Text;
}

// Before: initialization guard required before every OCR call
private bool _isInitialized = false;
private readonly SemaphoreSlim _initLock = new SemaphoreSlim(1, 1);

public async Task<string> GetTextAsync(string imagePath)
{
    await _initLock.WaitAsync();
    try
    {
        if (!_isInitialized)
        {
            await _tesseract.InitAsync("eng");
            _isInitialized = true;
        }
    }
    finally { _initLock.Release(); }

    var result = await _tesseract.RecognizeTextAsync(imagePath);
    return result.RecognizedText ?? string.Empty;
}

// After: no initialization, no guard, no semaphore
public string GetText(string imagePath)
{
    var ocr = new IronTesseract();
    using var input = new OcrInput();
    input.LoadImage(imagePath);
    return ocr.Read(input).Text;
}

// Before: success-flag pattern
var result = await _tesseract.RecognizeTextAsync(imagePath);
if (!result.Success)
{
    logger.LogError("OCR failed: {Status}", result.Status);
    return string.Empty;
}
return result.RecognizedText ?? string.Empty;

// After: exception pattern
try
{
    var ocr = new IronTesseract();
    using var input = new OcrInput();
    input.LoadImage(imagePath);
    var result = ocr.Read(input);
    return result.Text; // empty string if no text found — never null
}
catch (Exception ex)
{
    logger.LogError(ex, "OCR failed for {Path}.", imagePath);
    return string.Empty;
}

// Before: success-flag pattern
var result = await _tesseract.RecognizeTextAsync(imagePath);
if (!result.Success)
{
    logger.LogError("OCR failed: {Status}", result.Status);
    return string.Empty;
}
return result.RecognizedText ?? string.Empty;

// After: exception pattern
try
{
    var ocr = new IronTesseract();
    using var input = new OcrInput();
    input.LoadImage(imagePath);
    var result = ocr.Read(input);
    return result.Text; // empty string if no text found — never null
}
catch (Exception ex)
{
    logger.LogError(ex, "OCR failed for {Path}.", imagePath);
    return string.Empty;
}

<!-- Before: locked to MAUI target because TesseractOcrMauihas no net8.0 target -->
<TargetFramework>net8.0-android</TargetFramework>
<PackageReference Include="TesseractOcrMaui" Version="*" />

<!-- After: universal target — referenced from MAUI, API, worker, and Functions -->
<TargetFramework>net8.0</TargetFramework>
<PackageReference Include="IronOcr" Version="*" />

<!-- Before: locked to MAUI target because TesseractOcrMauihas no net8.0 target -->
<TargetFramework>net8.0-android</TargetFramework>
<PackageReference Include="TesseractOcrMaui" Version="*" />

<!-- After: universal target — referenced from MAUI, API, worker, and Functions -->
<TargetFramework>net8.0</TargetFramework>
<PackageReference Include="IronOcr" Version="*" />

// Before: PDF library + manual temp file management (50+ lines)
using var pdfDoc = PdfDocument.Open(pdfPath);
var results = new List<string>();
foreach (var page in pdfDoc.GetPages())
{
    var tempImagePath = Path.Combine(FileSystem.CacheDirectory, $"page_{page.Number}.png");
    RenderPageToImage(page, tempImagePath, dpi: 300);
    await _tesseract.InitAsync("eng");
    var r = await _tesseract.RecognizeTextAsync(tempImagePath);
    results.Add(r.RecognizedText ?? string.Empty);
    File.Delete(tempImagePath);
}
return string.Join("\n", results);

// After: native PDF support — 5 lines
var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadPdf(pdfPath);
var result = ocr.Read(input);
return result.Text;

// Before: PDF library + manual temp file management (50+ lines)
using var pdfDoc = PdfDocument.Open(pdfPath);
var results = new List<string>();
foreach (var page in pdfDoc.GetPages())
{
    var tempImagePath = Path.Combine(FileSystem.CacheDirectory, $"page_{page.Number}.png");
    RenderPageToImage(page, tempImagePath, dpi: 300);
    await _tesseract.InitAsync("eng");
    var r = await _tesseract.RecognizeTextAsync(tempImagePath);
    results.Add(r.RecognizedText ?? string.Empty);
    File.Delete(tempImagePath);
}
return string.Join("\n", results);

// After: native PDF support — 5 lines
var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadPdf(pdfPath);
var result = ocr.Read(input);
return result.Text;

# Find all files that reference TesseractOcrMauinamespaces
grep -r "TesseractOcrMaui" --include="*.cs" .

# Find all ITesseract injection points
grep -r "ITesseract" --include="*.cs" .

# Find all AddTesseractOcr registrations
grep -r "AddTesseractOcr" --include="*.cs" .

# Find all InitAsync calls
grep -r "InitAsync" --include="*.cs" .

# Find all RecognizeTextAsync calls
grep -r "RecognizeTextAsync" --include="*.cs" .

# Find traineddata asset declarations in project files
grep -r "tessdata" --include="*.csproj" .

# Find MauiAsset traineddata declarations
grep -r "MauiAsset" --include="*.csproj" .

# Identify projects with MAUI-only target frameworks that hold OCR logic
grep -r "net8.0-android\|net8.0-ios\|net8.0-windows" --include="*.csproj" .

# Find all files that reference TesseractOcrMauinamespaces
grep -r "TesseractOcrMaui" --include="*.cs" .

# Find all ITesseract injection points
grep -r "ITesseract" --include="*.cs" .

# Find all AddTesseractOcr registrations
grep -r "AddTesseractOcr" --include="*.cs" .

# Find all InitAsync calls
grep -r "InitAsync" --include="*.cs" .

# Find all RecognizeTextAsync calls
grep -r "RecognizeTextAsync" --include="*.cs" .

# Find traineddata asset declarations in project files
grep -r "tessdata" --include="*.csproj" .

# Find MauiAsset traineddata declarations
grep -r "MauiAsset" --include="*.csproj" .

# Identify projects with MAUI-only target frameworks that hold OCR logic
grep -r "net8.0-android\|net8.0-ios\|net8.0-windows" --include="*.csproj" .