/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) Statoil ASA 2016
//
//  ResInsight 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.
//
//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html>
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RiuRecentFileActionProvider.h"

#include "RiaFilePathTools.h"
#include "RiaGuiApplication.h"

#include <QAction>
#include <QFileInfo>
#include <QMessageBox>
#include <QSettings>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiuRecentFileActionProvider::RiuRecentFileActionProvider( int maxActionCount )
    : m_maxActionCount( maxActionCount )
{
    createActions();
    updateActions();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiuRecentFileActionProvider::~RiuRecentFileActionProvider() {}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuRecentFileActionProvider::addFileName( const QString& fileName )
{
    QSettings   settings;
    QStringList files = settings.value( "recentFileList" ).toStringList();
    files.removeAll( fileName );
    files.prepend( fileName );
    while ( files.size() > m_maxActionCount )
        files.removeLast();

    settings.setValue( "recentFileList", files );

    updateActions();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuRecentFileActionProvider::removeFileName( const QString& fileName )
{
    QSettings   settings;
    QStringList files = settings.value( "recentFileList" ).toStringList();
    files.removeAll( fileName );

    settings.setValue( "recentFileList", files );

    updateActions();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuRecentFileActionProvider::updateActions()
{
    QSettings   settings;
    QStringList files = settings.value( "recentFileList" ).toStringList();

    int numRecentFiles = qMin( files.size(), m_maxActionCount );

    for ( int i = 0; i < numRecentFiles; ++i )
    {
        QString text = tr( "&%1 %2" ).arg( i + 1 ).arg( QFileInfo( files[i] ).fileName() );
        m_recentFileActions[i]->setText( text );
        m_recentFileActions[i]->setData( files[i] );
        m_recentFileActions[i]->setToolTip( files[i] );
        m_recentFileActions[i]->setVisible( true );
    }

    for ( int j = numRecentFiles; j < m_maxActionCount; ++j )
        m_recentFileActions[j]->setVisible( false );

    m_separatorAction->setVisible( numRecentFiles > 0 );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
std::vector<QAction*> RiuRecentFileActionProvider::actions() const
{
    std::vector<QAction*> actionItems;
    actionItems.push_back( m_separatorAction );

    for ( auto act : m_recentFileActions )
    {
        actionItems.push_back( act );
    }

    return actionItems;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuRecentFileActionProvider::slotOpenRecentFile()
{
    QAction* action = qobject_cast<QAction*>( sender() );
    if ( action )
    {
        QString fileName = RiaFilePathTools::toInternalSeparator( action->data().toString() );

        RiaGuiApplication* app = RiaGuiApplication::instance();
        if ( RiaApplication::hasValidProjectFileExtension( fileName ) )
        {
            if ( !app->askUserToSaveModifiedProject() ) return;
        }

        bool loadingSucceded = RiaApplication::instance()->openFile( fileName );
        if ( loadingSucceded )
        {
            addFileName( fileName );
        }
        else
        {
            QMessageBox::warning( nullptr, "File open", "Failed to import file located at\n" + fileName );

            removeFileName( fileName );
        }
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuRecentFileActionProvider::createActions()
{
    for ( int i = 0; i < m_maxActionCount; ++i )
    {
        QAction* act = new QAction( this );
        act->setVisible( false );
        connect( act, SIGNAL( triggered() ), this, SLOT( slotOpenRecentFile() ) );

        m_recentFileActions.push_back( act );
    }

    m_separatorAction = new QAction( this );
    m_separatorAction->setSeparator( true );
}