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#include "web_engine_visited_links_manager.h"

#include "browser_context_adapter.h"
#include "browser_context_qt.h"
#include "content_browser_client_qt.h"
#include "type_conversion.h"

#include "base/memory/scoped_ptr.h"
#include "components/visitedlink/browser/visitedlink_delegate.h"
#include "components/visitedlink/browser/visitedlink_master.h"

namespace QtWebEngineCore {

namespace {
class BasicUrlIterator : public visitedlink::VisitedLinkMaster::URLIterator {
public:
    BasicUrlIterator(const QList<QUrl> &urls) : m_urls(urls) {}
    virtual const GURL& NextURL() { m_currentUrl = toGurl(m_urls.takeFirst()); return m_currentUrl; }
    virtual bool HasNextURL() const { return !m_urls.isEmpty(); }
private:
    QList<QUrl> m_urls;
    GURL m_currentUrl;

};
} // Anonymous namespace

// Due to the design of the visitedLink component, it seems safer to provide a
// basic delegate that will simply rebuild an empty visitedLink table if needed
// from the application history rather than crashing. This is functionality
// that was covered by QWebHistoryInterface in QtWebKitWidgets.

class VisitedLinkDelegateQt : public visitedlink::VisitedLinkDelegate
{
public:
    ~VisitedLinkDelegateQt() {}
    void RebuildTable(const scoped_refptr<URLEnumerator>& enumerator) { enumerator->OnComplete(true); }
};

void WebEngineVisitedLinksManager::deleteAllVisitedLinkData()
{
    m_visitedLinkMaster->DeleteAllURLs();
}

void WebEngineVisitedLinksManager::deleteVisitedLinkDataForUrls(const QList<QUrl> &urlsToDelete)
{
    BasicUrlIterator iterator(urlsToDelete);
    m_visitedLinkMaster->DeleteURLs(&iterator);
}

bool WebEngineVisitedLinksManager::containsUrl(const QUrl &url) const
{
    return m_visitedLinkMaster->IsVisited(toGurl(url));
}

WebEngineVisitedLinksManager::WebEngineVisitedLinksManager(BrowserContextAdapter *adapter)
    : m_delegate(new VisitedLinkDelegateQt)
{
    Q_ASSERT(adapter && adapter->browserContext());
    BrowserContextQt *browserContext = adapter->browserContext();
    m_visitedLinkMaster.reset(new visitedlink::VisitedLinkMaster(browserContext, m_delegate.data(), adapter->persistVisitedLinks()));
    m_visitedLinkMaster->Init();
}

WebEngineVisitedLinksManager::~WebEngineVisitedLinksManager()
{
}

void WebEngineVisitedLinksManager::addUrl(const GURL &urlToAdd)
{
    Q_ASSERT(m_visitedLinkMaster);
    m_visitedLinkMaster->AddURL(urlToAdd);
}

} // namespace QtWebEngineCore
