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#include "cpphoverhandler.h"

#include "cppeditorconstants.h"
#include "cppelementevaluator.h"

#include <coreplugin/helpmanager.h>
#include <texteditor/texteditor.h>

#include <utils/qtcassert.h>

#include <QTextCursor>
#include <QUrl>

using namespace Core;
using namespace TextEditor;

namespace CppEditor {
namespace Internal {

CppHoverHandler::CppHoverHandler()
{}

CppHoverHandler::~CppHoverHandler()
{}

bool CppHoverHandler::acceptEditor(IEditor *editor)
{
    return editor->document()->id() == CppEditor::Constants::CPPEDITOR_ID;
}

void CppHoverHandler::identifyMatch(TextEditorWidget *editorWidget, int pos)
{
    if (!editorWidget->extraSelectionTooltip(pos).isEmpty()) {
        setToolTip(editorWidget->extraSelectionTooltip(pos));
    } else {
        QTextCursor tc(editorWidget->document());
        tc.setPosition(pos);

        CppElementEvaluator evaluator(editorWidget);
        evaluator.setTextCursor(tc);
        evaluator.execute();
        if (evaluator.hasDiagnosis()) {
            setToolTip(evaluator.diagnosis());
            setIsDiagnosticTooltip(true);
        }
        if (evaluator.identifiedCppElement()) {
            const QSharedPointer<CppElement> &cppElement = evaluator.cppElement();
            if (!isDiagnosticTooltip())
                setToolTip(cppElement->tooltip);
            QStringList candidates = cppElement->helpIdCandidates;
            candidates.removeDuplicates();
            foreach (const QString &helpId, candidates) {
                if (helpId.isEmpty())
                    continue;

                const QMap<QString, QUrl> helpLinks = HelpManager::linksForIdentifier(helpId);
                if (!helpLinks.isEmpty()) {
                    setLastHelpItemIdentified(HelpItem(helpId,
                                                       cppElement->helpMark,
                                                       cppElement->helpCategory,
                                                       helpLinks));
                    break;
                }
            }
        }
    }
}

void CppHoverHandler::decorateToolTip()
{
    if (Qt::mightBeRichText(toolTip()))
        setToolTip(toolTip().toHtmlEscaped());

    if (isDiagnosticTooltip())
        return;

    const HelpItem &help = lastHelpItemIdentified();
    if (help.isValid()) {
        // If Qt is built with a namespace, we still show the tip without it, as
        // it is in the docs and for consistency with the doc extraction mechanism.
        const HelpItem::Category category = help.category();
        const QString &contents = help.extractContent(false);
        if (!contents.isEmpty()) {
            if (category == HelpItem::ClassOrNamespace)
                setToolTip(help.helpId() + contents);
            else
                setToolTip(contents);
        } else if (category == HelpItem::Typedef ||
                   category == HelpItem::Enum ||
                   category == HelpItem::ClassOrNamespace) {
            // This approach is a bit limited since it cannot be used for functions
            // because the help id doesn't really help in that case.
            QString prefix;
            if (category == HelpItem::Typedef)
                prefix = QLatin1String("typedef ");
            else if (category == HelpItem::Enum)
                prefix = QLatin1String("enum ");
            setToolTip(prefix + help.helpId());
        }
        addF1ToToolTip();
    }
}

} // namespace Internal
} // namespace CppEditor