//    Copyright (C) 2021 Jakub Melka
//
//    This file is part of Pdf4Qt.
//
//    Pdf4Qt is free software: you can redistribute it and/or modify
//    it under the terms of the GNU Lesser General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    with the written consent of the copyright owner, any later version.
//
//    Pdf4Qt 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 Lesser General Public License for more details.
//
//    You should have received a copy of the GNU Lesser General Public License
//    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include "pdfwidgetutils.h"
#include "pdfdocumentreader.h"

#include <QFileDialog>
#include <QMessageBox>
#include <QInputDialog>
#include <QDesktopWidget>

namespace pdfdocpage
{

MainWindow::MainWindow(QWidget* parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow),
    m_model(new PageItemModel(this)),
    m_delegate(new PageItemDelegate(m_model, this))
{
    ui->setupUi(this);

    m_delegate->setPageImageSize(getDefaultPageImageSize());

    ui->documentItemsView->setModel(m_model);
    ui->documentItemsView->setItemDelegate(m_delegate);
    setMinimumSize(pdf::PDFWidgetUtils::scaleDPI(this, QSize(800, 600)));

    loadSettings();
}

MainWindow::~MainWindow()
{
    saveSettings();
    delete ui;
}

QSize MainWindow::getMinPageImageSize() const
{
    return pdf::PDFWidgetUtils::scaleDPI(this, QSize(40, 40));
}

QSize MainWindow::getDefaultPageImageSize() const
{
    return pdf::PDFWidgetUtils::scaleDPI(this, QSize(100, 100));
}

QSize MainWindow::getMaxPageImageSize() const
{
    return pdf::PDFWidgetUtils::scaleDPI(this, QSize(250, 250));
}

void MainWindow::on_actionClose_triggered()
{
    close();
}

void MainWindow::on_actionAddDocument_triggered()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Select PDF document"), m_settings.directory, tr("PDF document (*.pdf)"));
    if (!fileName.isEmpty())
    {
        addDocument(fileName);
    }
}

void MainWindow::updateActions()
{

}

void MainWindow::loadSettings()
{
    QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
    settings.beginGroup("MainWindow");
    QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
    if (geometry.isEmpty())
    {
        QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
        QRect windowRect(0, 0, availableGeometry.width() / 2, availableGeometry.height() / 2);
        windowRect = windowRect.translated(availableGeometry.center() - windowRect.center());
        setGeometry(windowRect);
    }
    else
    {
        restoreGeometry(geometry);
    }

    QByteArray state = settings.value("windowState", QByteArray()).toByteArray();
    if (!state.isEmpty())
    {
        restoreState(state);
    }
    settings.endGroup();

    settings.beginGroup("Settings");
    m_settings.directory = settings.value("directory").toString();
    settings.endGroup();
}

void MainWindow::saveSettings()
{
    QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
    settings.beginGroup("MainWindow");
    settings.setValue("geometry", saveGeometry());
    settings.setValue("windowState", saveState());
    settings.endGroup();

    settings.beginGroup("Settings");
    settings.setValue("directory", m_settings.directory);
    settings.endGroup();
}

void MainWindow::addDocument(const QString& fileName)
{
    auto queryPassword = [this](bool* ok)
    {
        *ok = false;
        return QInputDialog::getText(this, tr("Encrypted document"), tr("Enter password to access document content"), QLineEdit::Password, QString(), ok);
    };

    // Mark current directory as this
    QFileInfo fileInfo(fileName);
    m_settings.directory = fileInfo.dir().absolutePath();

    // Try to open a new document
    pdf::PDFDocumentReader reader(nullptr, qMove(queryPassword), true, false);
    pdf::PDFDocument document = reader.readFromFile(fileName);

    QString errorMessage = reader.getErrorMessage();
    pdf::PDFDocumentReader::Result result = reader.getReadingResult();
    if (result == pdf::PDFDocumentReader::Result::OK)
    {
        const pdf::PDFSecurityHandler* securityHandler = document.getStorage().getSecurityHandler();
        if (securityHandler->isAllowed(pdf::PDFSecurityHandler::Permission::Assemble) ||
            securityHandler->isAllowed(pdf::PDFSecurityHandler::Permission::Modify))
        {
            m_model->addDocument(fileName, qMove(document));
        }
        else
        {
            QMessageBox::critical(this, tr("Error"), tr("Document security doesn't permit to organize pages."));
        }
    }
    else if (result == pdf::PDFDocumentReader::Result::Failed)
    {
        QMessageBox::critical(this, tr("Error"), errorMessage);
    }

    updateActions();
}

}   // namespace pdfdocpage