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#include "web_channel_ipc_transport_host.h"

#include "base/strings/string16.h"
#include "content/public/browser/render_view_host.h"

#include "common/qt_messages.h"
#include "type_conversion.h"

#include <QJsonDocument>
#include <QJsonObject>

namespace QtWebEngineCore {

WebChannelIPCTransportHost::WebChannelIPCTransportHost(content::WebContents *contents, uint worldId, QObject *parent)
    : QWebChannelAbstractTransport(parent)
    , content::WebContentsObserver(contents)
    , m_worldId(worldId)
{
    Send(new WebChannelIPCTransport_Install(routing_id(), m_worldId));
}

WebChannelIPCTransportHost::~WebChannelIPCTransportHost()
{
}

void WebChannelIPCTransportHost::RenderViewHostChanged(content::RenderViewHost *oldHost, content::RenderViewHost *)
{
    if (oldHost)
        oldHost->Send(new WebChannelIPCTransport_Uninstall(oldHost->GetRoutingID(), m_worldId));
}

void WebChannelIPCTransportHost::RenderViewCreated(content::RenderViewHost *view_host)
{
    // Make sure the new view knows a webchannel is installed and in which world.
    view_host->Send(new WebChannelIPCTransport_Install(view_host->GetRoutingID(), m_worldId));
}

void WebChannelIPCTransportHost::setWorldId(uint worldId)
{
    if (worldId == m_worldId)
        return;
    Send(new WebChannelIPCTransport_Uninstall(routing_id(), m_worldId));
    m_worldId = worldId;
    Send(new WebChannelIPCTransport_Install(routing_id(), m_worldId));
}

void WebChannelIPCTransportHost::sendMessage(const QJsonObject &message)
{
    QJsonDocument doc(message);
    int size = 0;
    const char *rawData = doc.rawData(&size);
    Send(new WebChannelIPCTransport_Message(routing_id(), std::vector<char>(rawData, rawData + size), m_worldId));
}

void WebChannelIPCTransportHost::onWebChannelMessage(const std::vector<char> &message)
{
    QJsonDocument doc = QJsonDocument::fromRawData(message.data(), message.size(), QJsonDocument::BypassValidation);
    Q_ASSERT(doc.isObject());
    Q_EMIT messageReceived(doc.object(), this);
}

bool WebChannelIPCTransportHost::OnMessageReceived(const IPC::Message &message)
{
    bool handled = true;
    IPC_BEGIN_MESSAGE_MAP(WebChannelIPCTransportHost, message)
        IPC_MESSAGE_HANDLER(WebChannelIPCTransportHost_SendMessage, onWebChannelMessage)
        IPC_MESSAGE_UNHANDLED(handled = false)
    IPC_END_MESSAGE_MAP()
    return handled;
}

} // namespace
