/*
   Copyright (C) 2018-2019 Montel Laurent <montel@kde.org>

   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 2 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; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "markdownpreviewwidget.h"
#include "markdownconverter.h"
#include "markdownenginepage.h"
#include <KMessageBox>
#include <KLocalizedString>
#include <QWebChannel>
#include <QWebEngineSettings>
#include <QWebEngineView>
#include <QLabel>
#include <QVBoxLayout>

MarkdownPreviewWidget::MarkdownPreviewWidget(QWidget *parent)
    : QWidget(parent)
{
    mConverter = new MarkdownConverter(this);
    mConverter->setObjectName(QStringLiteral("converter"));
    connect(mConverter, &MarkdownConverter::failed, this, &MarkdownPreviewWidget::converterFailed);

    QVBoxLayout *mainLayout = new QVBoxLayout(this);
    mainLayout->setObjectName(QStringLiteral("mainLayout"));
    mainLayout->setContentsMargins(0, 0, 0, 0);

    MarkdownEnginePage *page = new MarkdownEnginePage(this);
    mWebView = new QWebEngineView(this);
    mWebView->setPage(page);
    mWebView->resize(600, 800);

    mWebView->settings()->setAttribute(QWebEngineSettings::JavascriptEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::PluginsEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::JavascriptCanOpenWindows, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::JavascriptCanAccessClipboard, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::LocalStorageEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::XSSAuditingEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::LocalContentCanAccessRemoteUrls, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::LocalContentCanAccessFileUrls, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::ErrorPageEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::HyperlinkAuditingEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::FullScreenSupportEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::WebGLEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::AutoLoadIconsForPage, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::Accelerated2dCanvasEnabled, false);
    mWebView->settings()->setAttribute(QWebEngineSettings::WebGLEnabled, false);

    mWebView->setObjectName(QStringLiteral("webengine"));
    mainLayout->addWidget(mWebView);

    mHoverUrlLabel = new QLabel(this);
    mHoverUrlLabel->setObjectName(QStringLiteral("mHoverUrlLabel"));
    mainLayout->addWidget(mHoverUrlLabel);

    mWebView->setContextMenuPolicy(Qt::NoContextMenu);
    connect(page, &MarkdownEnginePage::linkHovered, this, &MarkdownPreviewWidget::slotLinkHovered);
}

MarkdownPreviewWidget::~MarkdownPreviewWidget()
{
}

void MarkdownPreviewWidget::slotLinkHovered(const QString &url)
{
    QString truncateUrl = url;
    if (truncateUrl.length() > 80) {
        truncateUrl.truncate(80);
        truncateUrl += QStringLiteral("...");
    }
    mHoverUrlLabel->setText(truncateUrl);
    mHoverUrlLabel->setToolTip(url);
}

void MarkdownPreviewWidget::converterFailed(const QString &msg)
{
    KMessageBox::error(this, i18n("Converter Error"), msg);
}

void MarkdownPreviewWidget::setConverterSettings(bool enableEmbeddedLabel, bool enableExtraDefinitionLists)
{
    mConverter->setEnableEmbeddedLabel(enableEmbeddedLabel);
    mConverter->setEnableExtraDefinitionLists(enableExtraDefinitionLists);
}

void MarkdownPreviewWidget::slotUpdatePreview(const QString &text)
{
    mWebView->setHtml(mConverter->convertTextToMarkdown(text), QUrl(QStringLiteral("file://")));
}
