// Copyright(c) 2017-2018 Alejandro Sirgo Rica & Contributors
//
// This file is part of Flameshot.
//
//     Flameshot 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, either version 3 of the License, or
//     (at your option) any later version.
//
//     Flameshot 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 Flameshot.  If not, see <http://www.gnu.org/licenses/>.

#include "infowindow.h"
#include <QIcon>
#include <QVBoxLayout>
#include <QTableWidget>
#include <QHeaderView>
#include <QLabel>
#include <QKeyEvent>

#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
#include <QCursor>
#include <QRect>
#include <QScreen>
#include <QGuiApplication>
#endif

// InfoWindow show basic information about the usage of Flameshot

InfoWindow::InfoWindow(QWidget *parent) : QWidget(parent) {
    setAttribute(Qt::WA_DeleteOnClose);
    setWindowIcon(QIcon(":img/app/flameshot.svg"));
    setWindowTitle(tr("About"));

#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
    QRect position = frameGeometry();
    QScreen *screen = QGuiApplication::screenAt(QCursor::pos());
    position.moveCenter(screen->availableGeometry().center());
    move(position.topLeft());
#endif

    m_layout = new QVBoxLayout(this);
    m_layout->setAlignment(Qt::AlignHCenter);
    initLabels();
    initInfoTable();
    show();
}


QVector<const char *> InfoWindow::m_keys = {
    "←↓↑→",
    "SHIFT + ←↓↑→",
    "ESC",
    "CTRL + C",
    "CTRL + S",
    "CTRL + Z",
    QT_TR_NOOP("Right Click"),
    QT_TR_NOOP("Mouse Wheel")
};

QVector<const char *> InfoWindow::m_description = {
    QT_TR_NOOP("Move selection 1px"),
    QT_TR_NOOP("Resize selection 1px"),
    QT_TR_NOOP("Quit capture"),
    QT_TR_NOOP("Copy to clipboard"),
    QT_TR_NOOP("Save selection as a file"),
    QT_TR_NOOP("Undo the last modification"),
    QT_TR_NOOP("Show color picker"),
    QT_TR_NOOP("Change the tool's thickness")
};

void InfoWindow::initInfoTable() {
    QTableWidget *table = new QTableWidget(this);
    table->setToolTip(tr("Available shortcuts in the screen capture mode."));

    m_layout->addWidget(table);

    table->setColumnCount(2);
    table->setRowCount(m_keys.size());
    table->setSelectionMode(QAbstractItemView::NoSelection);
    table->setFocusPolicy(Qt::NoFocus);
    table->verticalHeader()->hide();
    // header creation
    QStringList names;
    names  << tr("Key") << tr("Description");
    table->setHorizontalHeaderLabels(names);

    //add content
    for (int i= 0; i < m_keys.size(); ++i){
        table->setItem(i, 0, new QTableWidgetItem(tr(m_keys.at(i))));
        table->setItem(i, 1, new QTableWidgetItem(tr(m_description.at(i))));
    }

    // Read-only table items
    for (int x = 0; x < table->rowCount(); ++x) {
        for (int y = 0; y < table->columnCount(); ++y) {
            QTableWidgetItem *item = table->item(x, y);
            item->setFlags(item->flags() ^ Qt::ItemIsEditable);
        }
    }

    // adjust size
    table->resizeColumnsToContents();
    table->resizeRowsToContents();
    table->setMinimumWidth(400);
    table->setMaximumWidth(600);

    table->horizontalHeader()->setSectionResizeMode(1, QHeaderView::Stretch);
    table->horizontalHeader()->setSizePolicy(QSizePolicy::Expanding,
                                             QSizePolicy::Expanding);
    m_layout->addStretch();
}

void InfoWindow::initLabels() {
    m_layout->addStretch();
    QLabel *licenseTitleLabel = new QLabel(tr("<u><b>License</b></u>"), this);
    licenseTitleLabel->setAlignment(Qt::AlignHCenter);
    m_layout->addWidget(licenseTitleLabel);
    QLabel *licenseLabel = new QLabel("GPLv3+", this);
    licenseLabel->setAlignment(Qt::AlignHCenter);
    m_layout->addWidget(licenseLabel);
    m_layout->addStretch();

    QLabel *versionTitleLabel = new QLabel(tr("<u><b>Version</b></u>"), this);
    versionTitleLabel->setAlignment(Qt::AlignHCenter);
    m_layout->addWidget(versionTitleLabel);
    QString versionMsg = "Flameshot " + QString(APP_VERSION) + "\nCompiled with Qt "
            + QT_VERSION_STR;
    QLabel *versionLabel = new QLabel(versionMsg, this);
    versionLabel->setAlignment(Qt::AlignHCenter);
    m_layout->addWidget(versionLabel);
    m_layout->addStretch();
    m_layout->addSpacing(10);
    QLabel *shortcutsTitleLabel = new QLabel(tr("<u><b>Shortcuts</b></u>"), this);
    shortcutsTitleLabel->setAlignment(Qt::AlignHCenter);;
    m_layout->addWidget(shortcutsTitleLabel);
}

void InfoWindow::keyPressEvent(QKeyEvent *e) {
    if (e->key() == Qt::Key_Escape) {
            close();
    }
}