/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: git://neueland.iserlohn-fortress.net/smolbote.git
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#include "urllineedit.h"
#include <QTimer>
#include <QMenu>
#include <QStyle>
#include <QWidgetAction>

// ssl menu
#include <QLabel>

#include <QListView>
#include <QStringListModel>

UrlLineEdit::UrlLineEdit(QWidget *parent) :
    QLineEdit(parent),
    m_listView(new QListView(this))
{
    setPlaceholderText(tr("Enter address"));

    m_listView->setWindowFlags(Qt::ToolTip);
    m_listView->setVisible(false);
    connect(this, &UrlLineEdit::textEdited, this, &UrlLineEdit::updateCompleter);

    // ssl menu
    m_sslMenu = new QMenu(this);
    m_sslLabel = new QLabel(m_sslMenu);
    QWidgetAction *sslErrorAction = new QWidgetAction(m_sslMenu);
    sslErrorAction->setDefaultWidget(m_sslLabel);
    m_sslMenu->addAction(sslErrorAction);

    m_sslAction = addAction(style()->standardIcon(QStyle::SP_DriveNetIcon), QLineEdit::LeadingPosition);
    m_sslAction->setToolTip(tr("TODO: Display SSL Status popup here"));
    m_sslAction->setMenu(m_sslMenu);

    connect(m_sslAction, &QAction::triggered, this, [this]() {
        m_sslMenu->exec(this->mapToGlobal(QPoint(0, height())));
    });

    m_pageAction = addAction(style()->standardIcon(QStyle::SP_FileIcon), QLineEdit::TrailingPosition);
    m_pageAction->setShortcut(QKeySequence("F10"));
    m_pageAction->setToolTip(tr("Page Actions"));
    connect(m_pageAction, &QAction::triggered, m_pageAction, [&]() {
        //this->deselect();
        if(m_pageAction->menu() != nullptr) {
            m_pageAction->menu()->exec(this->mapToGlobal(QPoint(width(), height())));
        }
    });

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

    // connect signals
    connect(this, &QLineEdit::returnPressed, [this]() {
        if(this->text().startsWith('#')) {
            emit searchTermEntered(this->text().mid(1));
        } else {
            emit addressEntered(QUrl::fromUserInput(this->text()));
        }
        this->clearFocus();
    });

}

QAction *UrlLineEdit::pageAction()
{
    Q_CHECK_PTR(m_pageAction);
    return m_pageAction;
}

void UrlLineEdit::setCompleterModel(QAbstractItemModel *model)
{
    Q_CHECK_PTR(model);
    m_bookmarksModel = model;
}

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::showSslError(const QString &message)
{
    m_sslLabel->setText(message);
    m_sslAction->trigger();
}

void UrlLineEdit::updateCompleter(const QString &text)
{
    if(m_bookmarksModel == nullptr) {
        return;
    }

    const QModelIndexList res = m_bookmarksModel->match(QModelIndex(), Qt::EditRole, text, 7);
    QStringList l;
    for(const QModelIndex &idx : res) {
        l.append(idx.data(Qt::EditRole).toString());
    }

    if(!text.isEmpty()) {
        l.append(text);
    }
    QStringListModel *m = new QStringListModel(l, this);

    m_listView->setModel(m);

    // positioning
    m_listView->setFixedWidth(width());
    m_listView->move(mapToGlobal(QPoint(0, height())));
    m_listView->show();
}

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::keyPressEvent(QKeyEvent *event)
{
    if(!m_listView->isHidden()) {
        int key = event->key();
        int count = m_listView->model()->rowCount();
        QModelIndex currentIndex = m_listView->currentIndex();

        switch (key) {
        case Qt::Key_Down:
            if(currentIndex.row() + 1 >= count) {
                m_listView->setCurrentIndex(m_listView->model()->index(0, 0));
            } else {
                m_listView->setCurrentIndex(m_listView->model()->index(currentIndex.row() + 1, 0));
            }
            break;
        case Qt::Key_Up:
            if(currentIndex.row() == 0) {
                m_listView->setCurrentIndex(m_listView->model()->index(count - 1, 0));
            } else {
                m_listView->setCurrentIndex(m_listView->model()->index(currentIndex.row() - 1, 0));
            }
            break;

        case Qt::Key_Enter:
        case Qt::Key_Return:
            if(currentIndex.isValid()) {
                setText(currentIndex.data().toString());
            }
            m_listView->hide();
            return;
        case Qt::Key_Escape:
            m_listView->hide();
            break;
        default:
            break;
        }
    }
    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());
}