/// SPDX-License-Identifier: GPL-3.0-only
/*
 *  PrismLaucher - Minecraft Launcher
 *  Copyright (C) 2023 Rachel Powers <508861+Ryex@users.noreply.github.com>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, version 3.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *      Copyright 2013-2021 MultiMC Contributors
 *
 *      Licensed under the Apache License, Version 2.0 (the "License");
 *      you may not use this file except in compliance with the License.
 *      You may obtain a copy of the License at
 *
 *          http://www.apache.org/licenses/LICENSE-2.0
 *
 *      Unless required by applicable law or agreed to in writing, software
 *      distributed under the License is distributed on an "AS IS" BASIS,
 *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *      See the License for the specific language governing permissions and
 *      limitations under the License.
 */

#include "ProgressDialog.h"
#include "ui_ProgressDialog.h"

#include <limits>
#include <QDebug>
#include <QKeyEvent>

#include "tasks/Task.h"

#include "ui/widgets/SubTaskProgressBar.h"


// map a value in a numaric range of an arbatray type to between 0 and INT_MAX
// for getting the best precision out of the qt progress bar
template<typename T, std::enable_if_t<std::is_arithmetic_v<T>, bool> = true>
std::tuple<int, int> map_int_zero_max(T current, T range_max, T range_min)
{
    int int_max = std::numeric_limits<int>::max();

    auto type_range = range_max - range_min;
    double percentage = static_cast<double>(current - range_min) / static_cast<double>(type_range);
    int mapped_current = percentage * int_max;

    return {mapped_current, int_max};
}


ProgressDialog::ProgressDialog(QWidget* parent) : QDialog(parent), ui(new Ui::ProgressDialog)
{
    ui->setupUi(this);
    ui->taskProgressScrollArea->setHidden(true);
    this->setWindowFlags(this->windowFlags() & ~Qt::WindowContextHelpButtonHint);
    setAttribute(Qt::WidgetAttribute::WA_QuitOnClose, true);
    setSkipButton(false);
    changeProgress(0, 100);
}

void ProgressDialog::setSkipButton(bool present, QString label)
{
    ui->skipButton->setAutoDefault(false);
    ui->skipButton->setDefault(false);
    ui->skipButton->setFocusPolicy(Qt::ClickFocus);
    ui->skipButton->setEnabled(present);
    ui->skipButton->setVisible(present);
    ui->skipButton->setText(label);
    updateSize();
}

void ProgressDialog::on_skipButton_clicked(bool checked)
{
    Q_UNUSED(checked);
    if (ui->skipButton->isEnabled())  // prevent other triggers from aborting
        task->abort();
}

ProgressDialog::~ProgressDialog()
{
    delete ui;
}

void ProgressDialog::updateSize()
{   
    QSize lastSize = this->size();
    QSize qSize = QSize(480, minimumSizeHint().height());

    // if the current window is too small
    if ((lastSize != qSize) && (lastSize.height() < qSize.height()))
    {
        resize(qSize);
        
        // keep the dialog in the center after a resize
        this->move(
            this->parentWidget()->x() + (this->parentWidget()->width() - this->width()) / 2,
            this->parentWidget()->y() + (this->parentWidget()->height() - this->height()) / 2
        );
    }

    setMinimumSize(qSize);

}

int ProgressDialog::execWithTask(Task* task)
{
    this->task = task;

    if (!task) {
        qDebug() << "Programmer error: Progress dialog created with null task.";
        return QDialog::DialogCode::Accepted;
    }

    QDialog::DialogCode result {};
    if (handleImmediateResult(result)) {
        return result;
    }

    // Connect signals.
    connect(task, &Task::started, this, &ProgressDialog::onTaskStarted);
    connect(task, &Task::failed, this, &ProgressDialog::onTaskFailed);
    connect(task, &Task::succeeded, this, &ProgressDialog::onTaskSucceeded);
    connect(task, &Task::status, this, &ProgressDialog::changeStatus);
    connect(task, &Task::details, this, &ProgressDialog::changeStatus);
    connect(task, &Task::stepProgress, this, &ProgressDialog::changeStepProgress);
    connect(task, &Task::progress, this, &ProgressDialog::changeProgress);
    connect(task, &Task::aborted, this, &ProgressDialog::hide);
    connect(task, &Task::abortStatusChanged, ui->skipButton, &QPushButton::setEnabled);

    m_is_multi_step = task->isMultiStep();
    ui->taskProgressScrollArea->setHidden(!m_is_multi_step);
    updateSize();

    // It's a good idea to start the task after we entered the dialog's event loop :^)
    if (!task->isRunning()) {
        QMetaObject::invokeMethod(task, &Task::start, Qt::QueuedConnection);
    } else {
        changeStatus(task->getStatus());
        changeProgress(task->getProgress(), task->getTotalProgress());
    }

    return QDialog::exec();
}

// TODO: only provide the unique_ptr overloads
int ProgressDialog::execWithTask(std::unique_ptr<Task>&& task)
{
    connect(this, &ProgressDialog::destroyed, task.get(), &Task::deleteLater);
    return execWithTask(task.release());
}
int ProgressDialog::execWithTask(std::unique_ptr<Task>& task)
{
    connect(this, &ProgressDialog::destroyed, task.get(), &Task::deleteLater);
    return execWithTask(task.release());
}

bool ProgressDialog::handleImmediateResult(QDialog::DialogCode& result)
{
    if (task->isFinished()) {
        if (task->wasSuccessful()) {
            result = QDialog::Accepted;
        } else {
            result = QDialog::Rejected;
        }
        return true;
    }
    return false;
}

Task* ProgressDialog::getTask()
{
    return task;
}

void ProgressDialog::onTaskStarted() {}

void ProgressDialog::onTaskFailed(QString failure)
{
    reject();
    hide();
}

void ProgressDialog::onTaskSucceeded()
{
    accept();
    hide();
}

void ProgressDialog::changeStatus(const QString& status)
{
    ui->globalStatusLabel->setText(task->getStatus());
    ui->globalStatusDetailsLabel->setText(task->getDetails());

    updateSize();
}

void ProgressDialog::addTaskProgress(TaskStepProgress const& progress)
{
    SubTaskProgressBar* task_bar = new SubTaskProgressBar(this);
    taskProgress.insert(progress.uid, task_bar);
    ui->taskProgressLayout->addWidget(task_bar);
}

void ProgressDialog::changeStepProgress(TaskStepProgress const& task_progress)
{
    m_is_multi_step = true;
    if(ui->taskProgressScrollArea->isHidden()) {
        ui->taskProgressScrollArea->setHidden(false);
        updateSize();
    }
    
    if (!taskProgress.contains(task_progress.uid))
        addTaskProgress(task_progress);
    auto task_bar = taskProgress.value(task_progress.uid);


    auto const [mapped_current, mapped_total] = map_int_zero_max<qint64>(task_progress.current, task_progress.total, 0);
    if (task_progress.total <= 0) {
        task_bar->setRange(0, 0);
    } else {
        task_bar->setRange(0, mapped_total);
    }

    task_bar->setValue(mapped_current);
    task_bar->setStatus(task_progress.status);
    task_bar->setDetails(task_progress.details);

    if (task_progress.isDone()) {
        task_bar->setVisible(false);
    }

}

void ProgressDialog::changeProgress(qint64 current, qint64 total)
{
    ui->globalProgressBar->setMaximum(total);
    ui->globalProgressBar->setValue(current);

}

void ProgressDialog::keyPressEvent(QKeyEvent* e)
{
    if (ui->skipButton->isVisible()) {
        if (e->key() == Qt::Key_Escape) {
            on_skipButton_clicked(true);
            return;
        } else if (e->key() == Qt::Key_Tab) {
            ui->skipButton->setFocusPolicy(Qt::StrongFocus);
            ui->skipButton->setFocus();
            ui->skipButton->setAutoDefault(true);
            ui->skipButton->setDefault(true);
            return;
        }
    }
    QDialog::keyPressEvent(e);
}

void ProgressDialog::closeEvent(QCloseEvent* e)
{
    if (task && task->isRunning()) {
        e->ignore();
    } else {
        QDialog::closeEvent(e);
    }
}