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#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);
}