/***************************************************************************
 *   Copyright (c) 2017 Markus Hovorka <m.hovorka@live.de>                 *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  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 Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#include <QMenu>
#include <QPlainTextEdit>


#include <App/Application.h>
#include <Base/Type.h>

#include "ViewProviderTextDocument.h"
#include "ActionFunction.h"
#include "Document.h"
#include "MainWindow.h"
#include "PythonEditor.h"
#include "TextDocumentEditorView.h"
#include "ViewProviderDocumentObject.h"


using namespace Gui;

PROPERTY_SOURCE(Gui::ViewProviderTextDocument, Gui::ViewProviderDocumentObject)
const char* ViewProviderTextDocument::SyntaxEnums[] = {"None", "Python", nullptr};

ViewProviderTextDocument::ViewProviderTextDocument()
{
    sPixmap = "TextDocument";

    ADD_PROPERTY_TYPE(
        ReadOnly,
        (false),
        "Editor",
        App::Prop_None,
        "Defines whether the content can be edited."
    );

    QFont font;
    font.setFamily(
        QString::fromLatin1(
            App::GetApplication()
                .GetUserParameter()
                .GetGroup("BaseApp")
                ->GetGroup("Preferences")
                ->GetGroup("Editor")
                ->GetASCII("Font", font.family().toLatin1())
                .c_str()
        )
    );
    font.setPointSize(
        App::GetApplication()
            .GetUserParameter()
            .GetGroup("BaseApp")
            ->GetGroup("Preferences")
            ->GetGroup("Editor")
            ->GetInt("FontSize", font.pointSize())
    );

    ADD_PROPERTY_TYPE(FontSize, (font.pointSize()), "Editor", App::Prop_None, "Font size");
    ADD_PROPERTY_TYPE(
        FontName,
        ((const char*)font.family().toLatin1()),
        "Editor",
        App::Prop_None,
        "Font name"
    );

    ADD_PROPERTY_TYPE(
        SyntaxHighlighter,
        (static_cast<long>(0)),
        "Editor",
        App::Prop_None,
        "Syntax highlighting"
    );
    SyntaxHighlighter.setEnums(SyntaxEnums);

    DisplayMode.setStatus(App::Property::Hidden, true);
    OnTopWhenSelected.setStatus(App::Property::Hidden, true);
    SelectionStyle.setStatus(App::Property::Hidden, true);
    Visibility.setStatus(App::Property::Hidden, true);
}

void ViewProviderTextDocument::setupContextMenu(QMenu* menu, QObject* receiver, const char* member)
{
    auto func = new Gui::ActionFunction(menu);
    QAction* act = menu->addAction(QObject::tr("Edit Text"));
    func->trigger(act, [this]() { this->doubleClicked(); });

    ViewProviderDocumentObject::setupContextMenu(menu, receiver, member);
}

bool ViewProviderTextDocument::doubleClicked()
{
    if (!activateView()) {
        editorWidget = new QPlainTextEdit {};
        editorWidget->setReadOnly(ReadOnly.getValue());
        FontName.touch();
        SyntaxHighlighter.touch();

        getMainWindow()->addWindow(
            new TextDocumentEditorView {getObject<App::TextDocument>(), editorWidget, getMainWindow()}
        );
    }
    return true;
}

void ViewProviderTextDocument::onChanged(const App::Property* prop)
{
    if (editorWidget) {
        if (prop == &ReadOnly) {
            editorWidget->setReadOnly(ReadOnly.getValue());
        }
        else if (prop == &FontSize || prop == &FontName) {
            QFont font(QString::fromLatin1(this->FontName.getValue()), (int)this->FontSize.getValue());
            editorWidget->setFont(font);
        }
        else if (prop == &SyntaxHighlighter) {
            long value = SyntaxHighlighter.getValue();
            if (value == 1) {
                auto pythonSyntax = new PythonSyntaxHighlighter(editorWidget);
                pythonSyntax->setDocument(editorWidget->document());
            }
            else {
                auto shl = editorWidget->findChild<QSyntaxHighlighter*>();
                if (shl) {
                    shl->deleteLater();
                }
            }
        }
    }
    ViewProviderDocumentObject::onChanged(prop);
}

MDIView* ViewProviderTextDocument::getMDIView() const
{
    auto views = getDocument()->getMDIViewsOfType(TextDocumentEditorView::getClassTypeId());
    for (auto v : views) {
        auto textView = static_cast<TextDocumentEditorView*>(v);
        if (textView->getTextObject() == getObject()) {
            return textView;
        }
    }
    return nullptr;
}

bool ViewProviderTextDocument::activateView() const
{
    auto views = getDocument()->getMDIViewsOfType(TextDocumentEditorView::getClassTypeId());
    for (auto v : views) {
        auto textView = static_cast<TextDocumentEditorView*>(v);
        if (textView->getTextObject() == getObject()) {
            getMainWindow()->setActiveWindow(textView);
            return true;
        }
    }
    return false;
}