/*

 * Copyright (C) 2009 Ericsson AB

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer

 *    in the documentation and/or other materials provided with the

 *    distribution.

 * 3. Neither the name of Ericsson nor the names of its contributors

 *    may be used to endorse or promote products derived from this

 *    software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef EventSource_h

#define EventSource_h

#if ENABLE(EVENTSOURCE)

#include "ActiveDOMObject.h"

#include "AtomicStringHash.h"

#include "EventNames.h"

#include "EventTarget.h"

#include "KURL.h"

#include "ThreadableLoaderClient.h"

#include "Timer.h"

#include <wtf/HashMap.h>

#include <wtf/PassRefPtr.h>

#include <wtf/RefPtr.h>

#include <wtf/Vector.h>

namespace WebCore {

    class MessageEvent;

    class ResourceResponse;

    class TextResourceDecoder;

    class ThreadableLoader;

    class EventSource : public RefCounted<EventSource>, public EventTarget, private ThreadableLoaderClient, public ActiveDOMObject {

    public:

        static PassRefPtr<EventSource> create(const String& url, ScriptExecutionContext* context, ExceptionCode& ec) { return adoptRef(new EventSource(url, context, ec)); }

        virtual ~EventSource();

        static const unsigned long long defaultReconnectDelay;

        String url() const;

        enum State {

            CONNECTING = 0,

            OPEN = 1,

            CLOSED = 2,

        };

        State readyState() const;

        DEFINE_ATTRIBUTE_EVENT_LISTENER(open);

        DEFINE_ATTRIBUTE_EVENT_LISTENER(message);

        DEFINE_ATTRIBUTE_EVENT_LISTENER(error);

        void close();

        using RefCounted<EventSource>::ref;

        using RefCounted<EventSource>::deref;

        virtual EventSource* toEventSource() { return this; }

        virtual ScriptExecutionContext* scriptExecutionContext() const;

        virtual void stop();

    private:

        EventSource(const String& url, ScriptExecutionContext* context, ExceptionCode& ec);

        virtual void refEventTarget() { ref(); }

        virtual void derefEventTarget() { deref(); }

        virtual EventTargetData* eventTargetData();

        virtual EventTargetData* ensureEventTargetData();

        virtual void didReceiveResponse(const ResourceResponse& response);

        virtual void didReceiveData(const char* data, int length);

        virtual void didFinishLoading(unsigned long);

        virtual void didFail(const ResourceError& error);

        virtual void didFailRedirectCheck();

        void connect();

        void endRequest();

        void scheduleReconnect();

        void reconnectTimerFired(Timer<EventSource>*);

        void parseEventStream();

        void parseEventStreamLine(unsigned int pos, int fieldLength, int lineLength);

        PassRefPtr<MessageEvent> createMessageEvent();

        KURL m_url;

        State m_state;

        RefPtr<TextResourceDecoder> m_decoder;

        RefPtr<ThreadableLoader> m_loader;

        Timer<EventSource> m_reconnectTimer;

        Vector<UChar> m_receiveBuf;

        bool m_failSilently;

        bool m_requestInFlight;

        String m_eventName;

        Vector<UChar> m_data;

        String m_lastEventId;

        unsigned long long m_reconnectDelay;

        String m_origin;

        EventTargetData m_eventTargetData;

    };

} // namespace WebCore

#endif // ENABLE(EVENTSOURCE)

#endif // EventSource_h