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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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****************************************************************************/

#include "diffeditorplugin.h"
#include "diffeditoreditable.h"
#include "diffeditorwidget.h"
#include "diffeditorconstants.h"

#include <QCoreApplication>
#include <QFileDialog>
#include <QTextCodec>
#include <QtPlugin>

#include <coreplugin/actionmanager/actioncontainer.h>
#include <coreplugin/actionmanager/actionmanager.h>
#include <coreplugin/coreconstants.h>
#include <coreplugin/editormanager/editormanager.h>

namespace DiffEditor {

///////////////////////////////// DiffEditorFactory //////////////////////////////////

namespace Internal {

DiffEditorFactory::DiffEditorFactory(DiffEditorPlugin *owner)
    : m_mimeTypes(QLatin1String(Constants::DIFF_EDITOR_MIMETYPE)),
      m_owner(owner)
{
}

Core::Id DiffEditorFactory::id() const
{
    return Constants::DIFF_EDITOR_ID;
}

QString DiffEditorFactory::displayName() const
{
    return qApp->translate("DiffEditorFactory", Constants::DIFF_EDITOR_DISPLAY_NAME);
}

Core::IEditor *DiffEditorFactory::createEditor(QWidget *parent)
{
    DiffEditorWidget *editorWidget = new DiffEditorWidget(parent);
    DiffEditorEditable *editor = new DiffEditorEditable(editorWidget);
    return editor;
}

QStringList DiffEditorFactory::mimeTypes() const
{
    return m_mimeTypes;
}

///////////////////////////////// DiffEditorPlugin //////////////////////////////////

DiffEditorPlugin::DiffEditorPlugin()
{
}

DiffEditorPlugin::~DiffEditorPlugin()
{
}

void DiffEditorPlugin::initializeEditor(DiffEditorWidget *editor)
{
    Q_UNUSED(editor)
}

bool DiffEditorPlugin::initialize(const QStringList &arguments, QString *errorMessage)
{
    Q_UNUSED(arguments)
    Q_UNUSED(errorMessage)

    //register actions
    Core::ActionContainer *toolsContainer =
        Core::ActionManager::actionContainer(Core::Constants::M_TOOLS);
    toolsContainer->insertGroup(Core::Constants::G_TOOLS_OPTIONS, Constants::G_TOOLS_DIFF);

    Core::Context globalcontext(Core::Constants::C_GLOBAL);

    QAction *diffAction = new QAction(tr("Diff..."), this);
    Core::Command *diffCommand = Core::ActionManager::registerAction(diffAction,
                             "DiffEditor.Diff", globalcontext);
    connect(diffAction, SIGNAL(triggered()), this, SLOT(diff()));
    toolsContainer->addAction(diffCommand, Constants::G_TOOLS_DIFF);

    addAutoReleasedObject(new DiffEditorFactory(this));

    return true;
}

void DiffEditorPlugin::extensionsInitialized()
{
}

void DiffEditorPlugin::diff()
{
    QString fileName1 = QFileDialog::getOpenFileName(0,
                                                     tr("Select First File for Diff"),
                                                     QString());
    if (fileName1.isNull())
        return;

    QString fileName2 = QFileDialog::getOpenFileName(0,
                                                     tr("Select Second File for Diff"),
                                                     QString());
    if (fileName2.isNull())
        return;


    const Core::Id editorId = Constants::DIFF_EDITOR_ID;
    //: Editor title
    QString title = tr("Diff \"%1\", \"%2\"").arg(fileName1).arg(fileName2);
    Core::IEditor *outputEditor = Core::EditorManager::openEditorWithContents(editorId, &title, QString());
    Core::EditorManager::activateEditor(outputEditor, Core::EditorManager::ModeSwitch);

    DiffEditorWidget *editorWidget = getDiffEditorWidget(outputEditor);
    if (editorWidget) {
        const QString text1 = getFileContents(fileName1, editorWidget->codec());
        const QString text2 = getFileContents(fileName2, editorWidget->codec());

        DiffEditorWidget::DiffFilesContents dfc;
        dfc.leftFileInfo = fileName1;
        dfc.leftText = text1;
        dfc.rightFileInfo = fileName2;
        dfc.rightText = text2;
        QList<DiffEditorWidget::DiffFilesContents> list;
        list.append(dfc);

        editorWidget->setDiff(list);
    }
}

DiffEditorWidget *DiffEditorPlugin::getDiffEditorWidget(const Core::IEditor *editor) const
{
    if (const DiffEditorEditable *de = qobject_cast<const DiffEditorEditable *>(editor))
        return de->editorWidget();
    return 0;
}

QString DiffEditorPlugin::getFileContents(const QString &fileName, QTextCodec *codec) const
{
    QFile file(fileName);
    if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        return codec->toUnicode(file.readAll());
    }
    return QString();
}

} // namespace Internal
} // namespace DiffEditor

Q_EXPORT_PLUGIN(DiffEditor::Internal::DiffEditorPlugin)