// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#include "JFJochImageReadingWorker.h"
#include <QVector>
#include <QMutexLocker>

JFJochImageReadingWorker::JFJochImageReadingWorker(QObject *parent) : QObject(parent) {}

void JFJochImageReadingWorker::LoadFile(const QString &filename, qint64 image_number, qint64 summation) {
    QMutexLocker ul(&m);

    try {
        std::shared_ptr<const JFJochReaderDataset> dataset;
        auto start = std::chrono::high_resolution_clock::now();

        if (!http_mode && filename == current_file)
            logger.Info("File {} already loaded", filename.toStdString());
        else {
            if (filename.startsWith("http://")) {
                http_mode = true;
                http_reader.ReadURL(filename.toStdString());
                total_images = http_reader.GetNumberOfImages();
                dataset = http_reader.GetDataset();
                if (image_number < 0)
                        emit setToolbarMode(JFJochViewerToolbar::ToolbarMode::Autoload);
                else
                        emit setToolbarMode(JFJochViewerToolbar::ToolbarMode::None);
            } else {
                http_mode = false;
                reader.ReadFile(filename.toStdString());
                total_images = reader.GetNumberOfImages();
                dataset = reader.GetDataset();
                emit setToolbarMode(JFJochViewerToolbar::ToolbarMode::None);
            }
            current_image.reset();
            current_summation = 1;
            current_file = filename;
        }
        emit datasetLoaded(dataset);

        auto end = std::chrono::high_resolution_clock::now();
        auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
        logger.Info("Loaded file {} in {} ms", filename.toStdString(), duration);

        LoadImage_i(image_number, summation);
    } catch (std::exception &e) {
        logger.Error("Error loading file {} {}", filename.toStdString(), e.what());
    }
}

void JFJochImageReadingWorker::CloseFile() {
    QMutexLocker ul(&m);

    if (http_mode)
        http_reader.Close();
    else
        reader.Close();

    current_image_ptr.reset();
    current_image.reset();
    current_summation = 1;
    total_images = 0;
    current_file = "";
    emit imageLoaded({});
    emit datasetLoaded({});
}

void JFJochImageReadingWorker::LoadImage(int64_t image_number, int64_t summation) {
    QMutexLocker ul(&m);
    if ((image_number == current_image) && (current_summation == summation))
        return;
    LoadImage_i(image_number, summation);
}

void JFJochImageReadingWorker::LoadImage_i(int64_t image_number, int64_t summation) {
    // Assumes m locked!
    try {
        if (summation <= 0 || image_number + summation > total_images)
            return;

        std::vector<int32_t> image;
        auto start = std::chrono::high_resolution_clock::now();
        if (http_mode) {
            if (image_number < 0 && summation != 1)
                return;
            current_image_ptr = http_reader.LoadImage(image_number, summation);
            total_images = http_reader.GetNumberOfImages();
            emit datasetLoaded(http_reader.GetDataset());
        } else {
            if (image_number < 0)
                return;
            current_image_ptr = reader.LoadImage(image_number, summation);
        }

        if (!current_image_ptr) {
            emit imageLoaded({});
            return;
        }

        current_image = current_image_ptr->ImageData().number;
        current_summation = summation;

        auto end = std::chrono::high_resolution_clock::now();


        if (roi)
            current_image_ptr->CalcROI(roi.get());
        current_image_ptr->BraggIntegrate(bragg_integration_settings);

        auto end_analysis = std::chrono::high_resolution_clock::now();

        auto duration_1 = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
        auto duration_2 = std::chrono::duration_cast<std::chrono::milliseconds>(end_analysis - end).count();

        logger.Info("Loaded image {} in {}/{} ms", image_number, duration_1, duration_2);

        emit imageNumberChanged(total_images, current_image.value());
        emit imageLoaded(current_image_ptr);
    } catch (std::exception &e) {
        logger.Error("Error loading image {}: {}", image_number, e.what());
    }
}

void JFJochImageReadingWorker::SetROIBox(QRect box) {
    QMutexLocker ul(&m);
    roi = std::make_unique<ROIBox>("roi1", box.left(), box.right(), box.bottom(), box.top());

    if (current_image_ptr) {
        current_image_ptr->CalcROI(roi.get());
        emit imageStatsUpdated(current_image_ptr);
    }
}

void JFJochImageReadingWorker::SetROICircle(double x, double y, double radius) {
    QMutexLocker ul(&m);

    if (radius <= 0)
        roi.reset();
    else
        roi = std::make_unique<ROICircle>("roi1", x, y, radius);

    if (current_image_ptr) {
        current_image_ptr->CalcROI(roi.get());
        emit imageStatsUpdated(current_image_ptr);
    }
}

void JFJochImageReadingWorker::UpdateDataset(const DiffractionExperiment &experiment) {
    QMutexLocker ul(&m);
    if (!current_image)
        return;
    std::shared_ptr<const JFJochReaderDataset> dataset;
    if (http_mode) {
        http_reader.UpdateGeomMetadata(experiment);
        dataset = http_reader.GetDataset();
    } else {
        reader.UpdateGeomMetadata(experiment);
        dataset = reader.GetDataset();
    }
    emit datasetLoaded(dataset);

    LoadImage_i(current_image.value(), current_summation);
}