/*******************************************************************************
 **
 ** smolbote: yet another qute browser
 ** Copyright (C) 2017  Xian Nox
 **
 ** 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, either version 3 of the License, or
 ** (at your option) any later version.
 **
 ** 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 <http://www.gnu.org/licenses/>.
 **
 ******************************************************************************/

#include "urllineedit.h"
#include <QUrl>
#include <QTimer>

#include <QAction>
#include <QStyle>

#include <QWidgetAction>

UrlLineEdit::UrlLineEdit(QWidget *parent) :
    QLineEdit(parent)
{
    setPlaceholderText(tr("Enter address"));
    setContextMenuPolicy(Qt::NoContextMenu);


    QTextCharFormat hostnameFormat;
    hostnameFormat.setFontWeight(QFont::Bold);
    m_hostFormat.format = hostnameFormat;

    m_contextMenu = new QMenu(this);
    m_contextMenu->addAction("Copy URL", this, SLOT(copyUrl()));
    m_contextMenu->addAction("Paste URL", this, SLOT(pasteUrl()));
    m_contextMenu->addAction("Paste URL and go", this, SLOT(pasteUrlAndGo()));
    m_contextMenu->addSeparator();
    m_contextMenu->addAction("Bookmark this page", this, SLOT(bookmarkUrl()))->setEnabled(false);

    QAction *contextAction = addAction(style()->standardIcon(QStyle::SP_TitleBarMinButton), ActionPosition::TrailingPosition);
    contextAction->setShortcut(QKeySequence::fromString("F3"));
    connect(contextAction, SIGNAL(triggered()), this, SLOT(showMenu()));

    m_menu = new QMenu(this);
    m_menu->setWindowFlags(Qt::FramelessWindowHint | Qt::Tool);

    listWidget = new QListWidget();
    listWidget->addItem("start.duckduckgo.com");
    listWidget->addItem("neueland.iserlohn-fortress.net");

    connect(listWidget, &QListWidget::itemSelectionChanged, [this]() {
        setText(listWidget->currentItem()->text());
    });
    connect(listWidget, &QListWidget::itemActivated, [this](QListWidgetItem *item) {
        setText(listWidget->currentItem()->text());;
        this->m_menu->hide();
    });

    QWidgetAction *listAction = new QWidgetAction(m_menu);
    listAction->setDefaultWidget(listWidget);
    m_menu->addAction(listAction);
    QAction *closeAction = m_menu->addAction("Close");
    connect(closeAction, SIGNAL(triggered()), m_menu, SLOT(hide()));

    // connect signals
    connect(this, SIGNAL(textEdited(QString)), this, SLOT(showCompleter(QString)));
    connect(this, &QLineEdit::returnPressed, [this]() {
        m_menu->hide();
    });

}

void UrlLineEdit::setUrl(const QUrl &url)
{
    QString urlText = url.toString();
    QString domain = url.host();

    m_hostFormat.start = urlText.indexOf(domain);
    m_hostFormat.length = domain.length();

    clear();
    clearTextFormat();
    setTextFormat(m_hostFormat);
    setText(urlText);
}

void UrlLineEdit::focusInEvent(QFocusEvent *event)
{
    clearTextFormat();

    QLineEdit::focusInEvent(event);

    // select the contents when receiving focus
    // http://stackoverflow.com/a/35725950/1054406
    // mousePressEvent triggers right after focusInEvent so text selected in focusInEvent unselects by mousePressEvent
    QTimer::singleShot(0, this, SLOT(selectAll()));
}

void UrlLineEdit::resizeEvent(QResizeEvent *event)
{
    QLineEdit::resizeEvent(event);
    m_menu->setFixedWidth(width());
}

void UrlLineEdit::keyPressEvent(QKeyEvent *event)
{
    if(event->key() == Qt::Key_Down) {
        if(!listWidget->isVisible()) {
            showCompleter(text());
            return;
        } else {
            // listWidget is visible
            int newIndex = listWidget->currentRow()+1;
            if(newIndex < listWidget->count()) {
                listWidget->setCurrentRow(newIndex, QItemSelectionModel::SelectCurrent);
            }
            return;
        }
    } else if(event->key() == Qt::Key_Up) {
        if(listWidget->isVisible()) {
            int newIndex = listWidget->currentRow()-1;
            if(newIndex >= 0) {
                listWidget->setCurrentRow(newIndex, QItemSelectionModel::SelectCurrent);
            }
            return;
        }
    }
    QLineEdit::keyPressEvent(event);
}

// formatting taken from: https://forum.qt.io/topic/60962/setting-qlineedit-text-bold
void UrlLineEdit::setTextFormat(const QTextLayout::FormatRange &format)
{
    QList<QInputMethodEvent::Attribute> attributes;
    attributes.append(QInputMethodEvent::Attribute(QInputMethodEvent::TextFormat, format.start, format.length, format.format));
    QInputMethodEvent ev(QString(), attributes);
    event(&ev);

}

void UrlLineEdit::clearTextFormat()
{
    setTextFormat(QTextLayout::FormatRange());
}

// Completer

void UrlLineEdit::showCompleter(const QString &text)
{
    m_menu->move(mapToGlobal(QPoint(0, height())));
    //listWidget->setCurrentRow(0, QItemSelectionModel::SelectCurrent);
    m_menu->exec();
}

// Menu

void UrlLineEdit::showMenu()
{
    m_contextMenu->exec(mapToGlobal(QPoint(width() - m_contextMenu->width(), height())));
}

void UrlLineEdit::copyUrl()
{
    selectAll();
    copy();
    deselect();
}

void UrlLineEdit::pasteUrl()
{
    clear();
    paste();
}

void UrlLineEdit::pasteUrlAndGo()
{
    clear();
    paste();
    emit returnPressed();
}

void UrlLineEdit::bookmarkUrl()
{
    qDebug("TODO: bookmarkUrl()");
}