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/*
For general Scribus (>=1.3.2) copyright and licensing information please refer
to the COPYING file provided with the program. Following this notice may exist
a copyright and/or license notice that predates the release of Scribus 1.3.2
for which a new license (GPL+exception) is in place.
*/

/***************************************************************************
 *   Copyright (C) 2005 by Riku Leino                                      *
 *   tsoots@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 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; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.             *
 ***************************************************************************/

#include <QCheckBox>
#include <QDebug>
#include <QEvent>
#include <QPainter>
#include <QPushButton>
#include <QVBoxLayout>

#include "iconmanager.h"
#include "prefsmanager.h"
#include "scraction.h"
#include "scribuscore.h"
#include "ui/scmwmenumanager.h"
#include "undogui.h"


UndoGui::UndoGui(QWidget* parent, const char* name, Qt::WindowFlags f) : ScDockPalette(parent, name, f)
{
        languageChange();
}

void UndoGui::languageChange()
{
        setWindowTitle( tr("Action History"));
}

/*** UndoWidget ***************************************************************/

UndoWidget::UndoWidget(QWidget* parent, const char* name) : UndoGui(parent, name)
{
        auto &actions = ScCore->primaryMainWindow()->scrActions;
        auto menuManager = ScCore->primaryMainWindow()->scrMenuMgr;

        //Scribus action based toolbar button construction
        parent->addAction(actions["editUndoAction"]);
        parent->addAction(actions["editRedoAction"]);

        menuManager->createMenu("undoButtonMenu", "undoButtonMenu");
        menuManager->createMenu("redoButtonMenu", "redoButtonMenu");
        undoMenu = menuManager->undoMenu();
        redoMenu = menuManager->redoMenu();

        parent->addAction(actions["editCut"]);
        parent->addAction(actions["editCopy"]);
        parent->addAction(actions["editPaste"]);

        connect(undoMenu, SIGNAL(triggered(QAction*)), this, SLOT(undoMenuClicked(QAction*)));
        connect(redoMenu, SIGNAL(triggered(QAction*)), this, SLOT(redoMenuClicked(QAction*)));
}

void UndoWidget::clear()
{
        undoMenu->clear();
        undoItems.clear();
        //Scribus disable
        ScCore->primaryMainWindow()->scrActions["editUndoAction"]->setEnabled(false);
        redoMenu->clear();
        redoItems.clear();
        //Scribus disable;
        ScCore->primaryMainWindow()->scrActions["editRedoAction"]->setEnabled(false);
}

void UndoWidget::undoClicked()
{
        if (!undoItems.empty())
                emit undo(1);
}

void UndoWidget::redoClicked()
{
        if (!redoItems.empty())
                emit redo(1);
}

void UndoWidget::undoMenuClicked(QAction *id)
{
        int steps = undoMenu->actions().indexOf(id) + 1;
        emit undo(steps);
}

void UndoWidget::redoMenuClicked(QAction *id)
{
        int steps = redoMenu->actions().indexOf(id) + 1;
        emit redo(steps);
}

void UndoWidget::insertUndoItem(UndoObject* target, UndoState* state)
{
        undoItems.insert(undoItems.begin(), QString( tr("%1: %2", "undo target: action (f.e. Text frame: Resize)")).arg(target->getUName(), state->getName()));
        clearRedo();
        updateUndoMenu();
        updateRedoMenu();
}

void UndoWidget::insertRedoItem(UndoObject* target, UndoState* state)
{
        redoItems.push_back(QString( tr("%1: %2", "undo target: action (f.e. Text frame: Resize)")).arg(target->getUName(), state->getName()));
        updateRedoMenu();
        updateUndoMenu();
}

void UndoWidget::clearRedo()
{
        redoItems.erase(redoItems.begin(), redoItems.end());
        updateRedoMenu();
}

void UndoWidget::updateUndoMenu()
{
        undoMenu->clear();
        for (uint i = 0; i < MENU_HEIGHT && i < undoItems.size(); ++i)
                undoMenu->addAction(undoItems[i]);
        updateUndoActions();
}

void UndoWidget::updateRedoMenu()
{
        redoMenu->clear();
        for (uint i = 0; i < MENU_HEIGHT && i < redoItems.size(); ++i)
                redoMenu->addAction(redoItems[i]);
        updateUndoActions();
}

void UndoWidget::updateUndoActions()
{
        ScCore->primaryMainWindow()->scrActions["editUndoAction"]->setEnabled(undoMenu->actions().count() != 0);
        ScCore->primaryMainWindow()->scrActions["editRedoAction"]->setEnabled(redoMenu->actions().count() != 0);
}

void UndoWidget::updateUndo(int steps)
{
        for (int i = 0; i < steps; ++i)
        {
                redoItems.insert(redoItems.begin(), undoItems[0]);
                undoItems.erase(undoItems.begin());
        }
        updateUndoMenu();
        updateRedoMenu();
}

void UndoWidget::updateRedo(int steps)
{
        for (int i = 0; i < steps; ++i)
        {
                undoItems.insert(undoItems.begin(), redoItems[0]);
                redoItems.erase(redoItems.begin());
        }
        updateUndoMenu();
        updateRedoMenu();
}

void UndoWidget::popBack()
{
        if (!undoItems.empty())
        {
                undoItems.erase(undoItems.end() - 1);
                updateUndoMenu();
        }
}

UndoWidget::~UndoWidget()
{

}

/*** UndoPalette **************************************************************/

UndoPalette::UndoPalette(QWidget* parent, const char* name) : UndoGui(parent, name)
{
        setObjectName(QString::fromLocal8Bit(name));
        setMinimumSize( QSize(220, 240) );
        setSizePolicy( QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum));

        container = new QWidget(this);
        currentSelection = 0;
        redoItems = 0;
        QVBoxLayout* layout = new QVBoxLayout(container);
        layout->setContentsMargins(3, 3, 3, 3);
        layout->setSpacing(3);
        objectBox = new QCheckBox(this);
        layout->addWidget(objectBox);

        undoList = new QListWidget(this);
        undoList->setSelectionMode(QAbstractItemView::SingleSelection);
        undoList->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
        layout->addWidget(undoList);

        QHBoxLayout* buttonLayout = new QHBoxLayout;
        buttonLayout->setContentsMargins(0, 0, 0, 0);
        buttonLayout->setSpacing(6);
        undoButton = new QPushButton(IconManager::instance().loadPixmap("16/edit-undo.png"), "", this);
        buttonLayout->addWidget(undoButton);
        redoButton = new QPushButton(IconManager::instance().loadPixmap("16/edit-redo.png"), "", this);
        buttonLayout->addWidget(redoButton);
        //Save the translated key sequence - hopefully we get the translated one here!
        initialUndoKS = undoButton->shortcut();
        initialRedoKS = redoButton->shortcut();
        layout->addLayout(buttonLayout);
        setWidget(container);

        updateFromPrefs();
        languageChange();
        connect(&PrefsManager::instance(), SIGNAL(prefsChanged()), this, SLOT(updateFromPrefs()));
        connect(undoButton, SIGNAL(clicked()), this, SLOT(undoClicked()));
        connect(redoButton, SIGNAL(clicked()), this, SLOT(redoClicked()));
        connect(undoList, SIGNAL(currentRowChanged(int)), this, SLOT(undoListClicked(int)));
        connect(undoList, SIGNAL(itemEntered(QListWidgetItem*)), this, SLOT(showToolTip(QListWidgetItem*)));
        connect(undoList, SIGNAL(viewportEntered()), this, SLOT(removeToolTip()));
        connect(objectBox, SIGNAL(toggled(bool)), this, SLOT(objectCheckBoxClicked(bool)));
        connect(ScCore->primaryMainWindow()->scrActions["editActionMode"], SIGNAL(toggled(bool)),
                objectBox, SLOT(setChecked(bool)));
        connect(objectBox, SIGNAL(toggled(bool)),
                        ScCore->primaryMainWindow()->scrActions["editActionMode"], SLOT(setChecked(bool)));
}

void UndoPalette::clear()
{
        disconnect(undoList, SIGNAL(currentRowChanged(int)), this, SLOT(undoListClicked(int)));
        undoList->clear();
        undoList->addItem( tr("Initial State"));
        undoButton->setEnabled(false);
        redoButton->setEnabled(false);
        connect(undoList, SIGNAL(currentRowChanged(int)), this, SLOT(undoListClicked(int)));
}

void UndoPalette::updateFromPrefs()
{
        undoButton->setShortcut(ScCore->primaryMainWindow()->scrActions["editUndoAction"]->shortcut());
        redoButton->setShortcut(ScCore->primaryMainWindow()->scrActions["editRedoAction"]->shortcut());
}

void UndoPalette::changeEvent(QEvent *e)
{
        if (e->type() == QEvent::LanguageChange)
                languageChange();
        else
                UndoGui::changeEvent(e);
}

void UndoPalette::languageChange()
{
        UndoGui::languageChange();

        objectBox->setText( tr("Show Selected Object Only"));
        undoButton->setText( tr("&Undo"));
        redoButton->setText( tr("&Redo"));
       
        objectBox->setToolTip( "<qt>" + tr( "Show the action history for the selected item only. This changes the effect of the undo/redo buttons to act on the object or document." ) + "</qt>" );
        undoButton->setToolTip( "<qt>" + tr( "Undo the last action for either the current object or the document" ) + "</qt>");
        redoButton->setToolTip( "<qt>" + tr( "Redo the last action for either the current object or the document" ) + "</qt>");
}

void UndoPalette::insertUndoItem(UndoObject* target, UndoState* state)
{
        clearRedo();
        undoList->addItem(new UndoItem(target->getUName(), state->getName(),
                         state->getDescription(), target->getUPixmap(),
                         state->getPixmap(), true));
        currentSelection = undoList->count() - 1;
        updateList();
}

void UndoPalette::insertRedoItem(UndoObject* target, UndoState* state)
{
        if (undoList->count() == 1)
        {
                undoList->setCurrentItem(undoList->item(0));
                currentSelection = 0;
        }
        undoList->addItem(new UndoItem(target->getUName(), state->getName(),
                         state->getDescription(), target->getUPixmap(),
                         state->getPixmap(), false));
        updateList();
}

void UndoPalette::updateUndo(int steps)
{
        if (undoList->row(undoList->currentItem()) == currentSelection)
        {
                currentSelection -= steps;
                updateList();
        }
}

void UndoPalette::updateRedo(int steps)
{
        if (undoList->row(undoList->currentItem()) == currentSelection)
        {
                currentSelection += steps;
                updateList();
        }
}

void UndoPalette::popBack()
{
        if (undoList->count() > 1)
        {
                delete undoList->takeItem(0);
                currentSelection = undoList->count() - 1;
        }
}

void UndoPalette::updateList()
{
        undoList->setCurrentRow(currentSelection);
        redoButton->setEnabled(currentSelection < undoList->count() - 1);
        undoButton->setEnabled(currentSelection > 0);
        undoList->scrollToItem(undoList->item(currentSelection));
        for (int i = 0; i < undoList->count(); ++i)
        {
                UndoItem *item = dynamic_cast<UndoItem*>(undoList->item(i));
                if (!item)
                        continue;

                item->setUndoAction(currentSelection >= i);
        }
}

void UndoPalette::updateUndoActions()
{
        //ScMW->scrActions["editUndoAction"]->setEnabled(currentSelection > 0);
        //ScMW->scrActions["editRedoAction"]->setEnabled(currentSelection < undoList->numRows() - 1);
}

void UndoPalette::clearRedo()
{
        for (int i = (undoList->count() - 1); i > currentSelection; --i)
                delete undoList->takeItem(i);
}

void UndoPalette::undoClicked()
{
        emit undo(1);
}

void UndoPalette::redoClicked()
{
        emit redo(1);
}

void UndoPalette::undoListClicked(int i)
{
        if (i == currentSelection || (i == 0 && undoList->count() == 1))
                return;
        if (i > currentSelection)
                emit redo(i - currentSelection);
        else if (i < currentSelection)
                emit undo(currentSelection - i);
        currentSelection = i;
        updateList();
}

void UndoPalette::objectCheckBoxClicked(bool on)
{
        emit objectMode(on);
}

void UndoPalette::showToolTip(QListWidgetItem *i)
{
        UndoItem *item = dynamic_cast<UndoItem*>(i);
        if (item)
        {
                QString tip = item->getDescription();
                if (!tip.isNull()) /*TODO: Doesn't make sense! */
                  undoList->setToolTip(tip);
        }
        else
                removeToolTip();
}

void UndoPalette::removeToolTip()
{
        undoList->setToolTip("");
}

UndoPalette::~UndoPalette()
{

}

/*** UndoPalette::UndoItem ****************************************************/

UndoPalette::UndoItem::UndoItem()
{
        targetpixmap = nullptr;
        actionpixmap = nullptr;
        isUndoAction_ = true;
}

UndoPalette::UndoItem::UndoItem(const UndoItem &another)
{
        target = another.target;
        action = another.action;
        description = another.description;
        targetpixmap = another.targetpixmap;
        actionpixmap = another.actionpixmap;
        isUndoAction_ = another.isUndoAction_;
}

UndoPalette::UndoItem::UndoItem(const QString &targetName,
                                const QString &actionName,
                                const QString &actionDescription,
                                QPixmap *targetPixmap,
                                QPixmap *actionPixmap,
                                bool isUndoAction,
                                QListWidget * parent
                                                           )
        : QListWidgetItem(parent),
        targetpixmap(targetPixmap),
        actionpixmap(actionPixmap),
        target(targetName),
        action(actionName),
        description(actionDescription),
        isUndoAction_(isUndoAction)
{
        /*TODO: 16x16 is hardcoded, because images automatically scaled by QIcon are no longer recognizable
        would be better to have the icons designed for 16x16*/

        if (targetPixmap)
        {
                QPixmap pixmap;
                if (!targetPixmap->isNull())
                        pixmap = targetPixmap->scaled(16, 16);
                if (actionPixmap && !actionPixmap->isNull())
                {
                        QPainter p;
                        p.begin(&pixmap);
                        p.drawPixmap(0,0, actionPixmap->scaled(16, 16));
                        p.end();
                }
                setIcon(pixmap);
        }
        else
        {
                if (actionPixmap && !actionPixmap->isNull())
                        setIcon(actionPixmap->scaled(16, 16));
        }
        setText(tr("%1 - %2\n%3").arg(targetName, actionName, actionDescription));
}

QString UndoPalette::UndoItem::getDescription()
{
  return description;
}

bool UndoPalette::UndoItem::isUndoAction()
{
        return isUndoAction_;
}

void UndoPalette::UndoItem::setUndoAction(bool isUndo)
{
        isUndoAction_ = isUndo;
        QFont f = font();
        f.setItalic(!isUndoAction_);
        setFont(f);
}

UndoPalette::UndoItem::~UndoItem()
{

}