/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "examplecontent.h"
#include "colors.h"
#include "menumanager.h"
#include "imageitem.h"
#include "headingitem.h"

ExampleContent::ExampleContent(const QString &name, QGraphicsScene *scene, QGraphicsItem *parent)
    : DemoItem(scene, parent)
{
    this->name = name;
    this->heading = 0;
    this->description = 0;
    this->screenshot = 0;
}

void ExampleContent::prepare()
{
    if (!this->prepared){
        this->prepared = true;
        this->createContent();
    }
}

void ExampleContent::animationStopped(int id)
{
    if (id == DemoItemAnimation::ANIM_OUT){
        // Free up some memory:
        delete this->heading;
        delete this->description;
        delete this->screenshot;
        this->heading = 0;
        this->description = 0;
        this->screenshot = 0;
        this->prepared = false;
    }
}

QString ExampleContent::loadDescription()
{
    QByteArray ba = MenuManager::instance()->getHtml(this->name);
    QString errorMsg;
    int errorLine, errorColumn;

    QDomDocument exampleDoc;
    if (ba.isEmpty()) {
        qDebug() << "No documentation found for" << name << "Is the documentation built?";
    } else if (!exampleDoc.setContent(ba, false, &errorMsg, &errorLine, &errorColumn)) {
        qDebug() << "Error loading documentation for " << name << ": " << errorMsg << errorLine << errorColumn;
    }

    QDomNodeList paragraphs = exampleDoc.elementsByTagName("p");
    if (paragraphs.length() < 1 && Colors::verbose)
        qDebug() << "- ExampleContent::loadDescription(): Could not load description:"
                 << MenuManager::instance()->info[this->name]["docfile"];
    QString description = Colors::contentColor + QLatin1String(""); 
    //QLatin1String("Could not load description. Ensure that the documentation for Qt is built."); // QTBUG-12522: If there is no description why show an error to the user when qDebug above communications the issue (if it is indeed an issue at all) when demos are built?
    for (int p = 0; p < int(paragraphs.length()); ++p) {
        description = this->extractTextFromParagraph(paragraphs.item(p));
        if (this->isSummary(description)) {
            break;
        }
    }
    return Colors::contentColor + description;
}

bool ExampleContent::isSummary(const QString &text)
{
    return (!text.contains("[") &&
        text.indexOf(QRegExp(QString("(In )?((The|This) )?(%1 )?.*(tutorial|example|demo|application)").arg(this->name),
                             Qt::CaseInsensitive)) != -1);
}

QString ExampleContent::extractTextFromParagraph(const QDomNode &parentNode)
{
    QString description;
    QDomNode node = parentNode.firstChild();

    while (!node.isNull()) {
        QString beginTag;
        QString endTag;
        if (node.isText())
            description += Colors::contentColor + node.nodeValue();
        else if (node.hasChildNodes()) {
            if (node.nodeName() == "b") {
                beginTag = "<b>";
                endTag = "</b>";
            } else if (node.nodeName() == "a") {
                beginTag = Colors::contentColor;
                endTag = "</font>";
            } else if (node.nodeName() == "i") {
                beginTag = "<i>";
                endTag = "</i>";
            } else if (node.nodeName() == "tt") {
                beginTag = "<tt>";
                endTag = "</tt>";
            }
            description += beginTag + this->extractTextFromParagraph(node) + endTag;
        }
        node = node.nextSibling();
    }

    return description;
}

void ExampleContent::createContent()
{
    // Create the items:
    this->heading = new HeadingItem(this->name, this->scene(), this);
    this->description = new DemoTextItem(this->loadDescription(), Colors::contentFont(),
        Colors::heading, 500, this->scene(), this);
    int imgHeight = 340 - int(this->description->boundingRect().height()) + 50;
    this->screenshot = new ImageItem(QImage::fromData(MenuManager::instance()->getImage(this->name)),
          550, imgHeight, this->scene(), this);

    // Place the items on screen:
    this->heading->setPos(0, 3);
    this->description->setPos(0, this->heading->pos().y() + this->heading->boundingRect().height() + 10);
    this->screenshot->setPos(0, this->description->pos().y() + this->description->boundingRect().height() + 10);
}

QRectF ExampleContent::boundingRect() const
{
    return QRectF(0, 0, 500, 100);
}