/*
 * Copyright 2008-2009 Ben Boeckel <MathStuf@gmail.com>
 * 
 * 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/>.
 */

// Header include
#include "ScriptWidget.h"

// Sigmodr widget includes
#include "ScriptWidget.h"

// KDE includes
#include <KActionCollection>
#include <KApplication>
#include <KComboBox>
#include <KMenu>
#include <KMessageBox>
#include <KStandardAction>
#include <KTextEdit>
#include <KXMLGUIFactory>
#include <KXmlGuiWindow>
#include <KTextEditor/Document>
#include <KTextEditor/Editor>
#include <KTextEditor/EditorChooser>
#include <KTextEditor/View>

// Qt includes
#include <QtCore/QFile>
#include <QtGui/QGridLayout>
#include <QtGui/QLabel>
#include <QtUiTools/QUiLoader>

Sigmodr::Widgets::ScriptWidget::ScriptWidget(QWidget* parent, const Sigcore::Script& value) :
        QWidget(parent),
        m_value(value),
        ui_simpleEdit(NULL),
        m_editor(KTextEditor::EditorChooser::editor()),
        m_document(NULL)
{
    QFile file(":/gui/script.ui");
    file.open(QFile::ReadOnly);
    QWidget *formWidget = QUiLoader().load(&file, this);
    file.close();
    ui_interpreter = formWidget->findChild<KComboBox*>("varInterpreter");
    connect(ui_interpreter, SIGNAL(currentIndexChanged(QString)), this, SLOT(interpreterChanged(QString)));
    m_languages["C#"] = "mono";
    m_languages["Falcon"] = "falcon";
    m_languages["Java"] = "java";
    m_languages["JavaScript"] = "javascript";
    m_languages["QtScript"] = "qtscript";
    m_languages["Lua"] = "lua";
    m_languages["PHP"] = "php";
    m_languages["Python"] = "python";
    m_languages["Ruby"] = "ruby";
    ui_interpreter->addItems(m_languages.keys());
    QLabel* labelScript = formWidget->findChild<QLabel*>("labelScript");
    QGridLayout* gridLayout = formWidget->findChild<QGridLayout*>("gridLayout");
    if (m_editor)
    {
        m_editor->readConfig();
        m_document = m_editor->createDocument(this);
        ui_kteEdit = m_document->createView(this);
        KActionCollection* collection = ui_kteEdit->actionCollection();
        collection->action("file_save")->setVisible(false);
        collection->action("file_save")->setEnabled(false);
        collection->action("file_save_as")->setVisible(false);
        collection->action("file_save_as")->setEnabled(false);
        collection->action("edit_undo")->setVisible(false);
        collection->action("edit_undo")->setEnabled(false);
        collection->action("edit_redo")->setVisible(false);
        collection->action("edit_redo")->setEnabled(false);
        collection->action("edit_cut")->setVisible(false);
        collection->action("edit_copy")->setVisible(false);
        collection->action("edit_paste")->setVisible(false);
        ui_kteEdit->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
        ui_kteEdit->setMinimumHeight(300);
        KXmlGuiWindow* topLevel = qobject_cast<KXmlGuiWindow*>(KApplication::kApplication()->activeWindow());
        if (topLevel)
        {
            KMenu *menu = qobject_cast<KMenu*>(topLevel->factory()->container("ktexteditor_popup", topLevel));
            if (menu)
                ui_kteEdit->setContextMenu(menu);
        }
        labelScript->setBuddy(ui_kteEdit);
        setTabOrder(ui_interpreter, ui_kteEdit);
        gridLayout->addWidget(ui_kteEdit, 1, 1);
        connect(m_document, SIGNAL(textChanged(KTextEditor::Document*)), this, SLOT(scriptChanged()));
        connect(ui_kteEdit, SIGNAL(focusIn(KTextEditor::View*)), this, SLOT(focused(KTextEditor::View*)));
        connect(ui_kteEdit, SIGNAL(focusOut(KTextEditor::View*)), this, SLOT(unfocused(KTextEditor::View*)));
    }
    else
    {
        KMessageBox::information(this, "A KDE text-editor component could not be found.\nPlease check your KDE installation.\n\nEnhanced editing will not be used.", "KDE editor component not found", "kte-component");
        ui_simpleEdit = new KTextEdit(m_value.script(), this);
        ui_simpleEdit->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
        ui_simpleEdit->setMinimumHeight(300);
        labelScript->setBuddy(ui_simpleEdit);
        setTabOrder(ui_interpreter, ui_simpleEdit);
        gridLayout->addWidget(ui_simpleEdit, 1, 1);
        connect(ui_simpleEdit, SIGNAL(textChanged()), this, SLOT(scriptChanged()));
        return;
    }
    connect(this, SIGNAL(valueChanged(Sigcore::Script)), SLOT(setGui()));
    setGui();
}

Sigmodr::Widgets::ScriptWidget::~ScriptWidget()
{
    if (m_editor)
        m_editor->writeConfig(NULL);
}

Sigcore::Script Sigmodr::Widgets::ScriptWidget::value() const
{
    return m_value;
}

void Sigmodr::Widgets::ScriptWidget::setGui()
{
    ui_interpreter->setCurrentIndex(ui_interpreter->findData(m_value.interpreter()));
    if (m_document)
    {
        m_document->setHighlightingMode(ui_interpreter->currentText());
        KTextEditor::Cursor cursor = ui_kteEdit->cursorPosition();
        m_document->setText(m_value.script());
        ui_kteEdit->setCursorPosition(cursor);
    }
    else
    {
        QTextCursor cursor = ui_simpleEdit->textCursor();
        ui_simpleEdit->setPlainText(m_value.script());
        ui_simpleEdit->setTextCursor(cursor);
    }
}

void Sigmodr::Widgets::ScriptWidget::setValue(const Sigcore::Script& value)
{
    if (m_value != value)
    {
        m_value = value;
        emit(valueChanged(m_value));
    }
}

void Sigmodr::Widgets::ScriptWidget::interpreterChanged(const QString& interpreter)
{
    m_value.setInterpreter(m_languages[interpreter]);
    if (m_document)
        m_document->setHighlightingMode(interpreter);
    emit(valueChanged(m_value));
}

void Sigmodr::Widgets::ScriptWidget::scriptChanged()
{
    if (m_document)
    {
        if (m_value.script() != m_document->text())
        {
            m_value.setScript(m_document->text());
            emit(valueChanged(m_value));
        }
    }
    else
    {
        if (m_value.script() != ui_simpleEdit->toPlainText())
        {
            m_value.setScript(ui_simpleEdit->toPlainText());
            emit(valueChanged(m_value));
        }
    }
}

void Sigmodr::Widgets::ScriptWidget::focused(KTextEditor::View* view)
{
    KXmlGuiWindow* topLevel = qobject_cast<KXmlGuiWindow*>(KApplication::kApplication()->activeWindow());
    if (topLevel)
        topLevel->guiFactory()->addClient(view);
}

void Sigmodr::Widgets::ScriptWidget::unfocused(KTextEditor::View* view)
{
    KXmlGuiWindow* topLevel = qobject_cast<KXmlGuiWindow*>(KApplication::kApplication()->activeWindow());
    QWidget* focused = KApplication::focusWidget();
    // FIXME: Does this fail with non-Kate KTextEditor implementations?
    if (topLevel && focused && ((focused->metaObject()->className() != QString("KateViewInternal")) || ((focused != view) && (QString(focused->metaObject()->className()) == view->metaObject()->className()))))
        topLevel->guiFactory()->removeClient(view);
}