/*******************************************************************************
 **
 ** 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 "browser.h"

#include <QWidgetAction>

UrlLineEdit::UrlLineEdit(QWidget *parent) :
    QLineEdit(parent)
{
    //setStyleSheet("color: #808080");
    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);

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

    connect(listWidget, &QListWidget::itemActivated, [this](QListWidgetItem *item){
        setUrl(urlFromUserInput(item->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(this, SIGNAL(textEdited(QString)), this, SLOT(showCompleter(QString)));

}

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);
}

QUrl UrlLineEdit::url()
{
    return urlFromUserInput(text());
}

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()));

    //QTimer::singleShot(0, this, SLOT(showCompleter()));
}

void UrlLineEdit::focusOutEvent(QFocusEvent *event)
{
    wasFocused = false;
    setUrl(urlFromUserInput(text()));
    QLineEdit::focusOutEvent(event);
}

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

// 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());
}

QUrl UrlLineEdit::urlFromUserInput(const QString &input)
{
    if(input.startsWith('#')) {
        return QUrl::fromUserInput(qApp->settings()->value("general.search").toString().replace("$term", input.mid(1)));
    }
    return QUrl::fromUserInput(input);
}

// Completer

void UrlLineEdit::showCompleter(const QString &text)
{
    m_menu->move(mapToGlobal(QPoint(0, height())));
    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();
    setUrl(urlFromUserInput(text()));
}

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

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