// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#include "JFJochProcessController.h"
#include "../reader/JFJochHDF5Reader.h"

#include <QMetaType>

JFJochProcessController::JFJochProcessController(QObject *parent) : QObject(parent) {
    qRegisterMetaType<ProcessResult>("ProcessResult");
}

JFJochProcessController::~JFJochProcessController() {
    cancel();
    joinWorker_();
}

void JFJochProcessController::joinWorker_() {
    if (worker_.joinable())
        worker_.join();
}

void JFJochProcessController::start(const QString &file_path, DiffractionExperiment experiment,
                                    PixelMask pixel_mask, ProcessConfig config) {
    if (running_.exchange(true))
        return;   // a job is already running

    cancel_pending_ = false;
    joinWorker_();   // reap the previous (finished) worker, if any
    worker_ = std::thread(&JFJochProcessController::run_, this,
                          file_path, std::move(experiment), std::move(pixel_mask), std::move(config));
    emit started();
}

void JFJochProcessController::cancel() {
    cancel_pending_ = true;
    if (auto *p = active_.load())
        p->Cancel();
}

void JFJochProcessController::run_(QString file_path, DiffractionExperiment experiment,
                                   PixelMask pixel_mask, ProcessConfig config) {
    try {
        JFJochHDF5Reader reader;
        reader.ReadFile(file_path.toStdString());

        JFJochProcess process(reader, std::move(experiment), std::move(pixel_mask), std::move(config));
        active_ = &process;
        if (cancel_pending_)
            process.Cancel();

        ProcessResult result = process.Run(this);

        active_ = nullptr;
        running_ = false;
        emit finished(result);
    } catch (const std::exception &e) {
        active_ = nullptr;
        running_ = false;
        emit failed(QString::fromStdString(e.what()));
    }
}

void JFJochProcessController::OnPhase(const std::string &phase) {
    emit phaseChanged(QString::fromStdString(phase));
}

void JFJochProcessController::OnProgress(uint64_t done, uint64_t total) {
    // Throttle to ~200 updates so a long run does not flood the GUI event queue.
    const uint64_t step = total > 200 ? total / 200 : 1;
    if (done == total || done % step == 0)
        emit progress(done, total);
}