/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 * Copyright (C) 2009 Google Inc. 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 Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 InspectorDOMAgent_h
#define InspectorDOMAgent_h

#include "AtomicString.h"
#include "EventListener.h"
#include "EventTarget.h"
#include "ScriptArray.h"
#include "ScriptObject.h"
#include "ScriptState.h"

#include <wtf/ListHashSet.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>

namespace WebCore {
    class ContainerNode;
    class Element;
    class Event;
    class Document;
    class InspectorFrontend;
    class NameNodeMap;
    class Node;
    class Page;

    struct EventListenerInfo {
        EventListenerInfo(Node* node, const AtomicString& eventType, const EventListenerVector& eventListenerVector)
            : node(node)
            , eventType(eventType)
            , eventListenerVector(eventListenerVector)
        {
        }

        Node* node;
        const AtomicString eventType;
        const EventListenerVector eventListenerVector;
    };

    class InspectorDOMAgent : public EventListener {
    public:
        static PassRefPtr<InspectorDOMAgent> create(InspectorFrontend* frontend)
        {
            return adoptRef(new InspectorDOMAgent(frontend));
        }

        static const InspectorDOMAgent* cast(const EventListener* listener)
        {
            return listener->type() == InspectorDOMAgentType
                ? static_cast<const InspectorDOMAgent*>(listener)
                : 0;
        }

        InspectorDOMAgent(InspectorFrontend* frontend);
        ~InspectorDOMAgent();

        void reset();

        virtual bool operator==(const EventListener& other);

        // Methods called from the frontend.
        void getChildNodes(long callId, long nodeId);
        void setAttribute(long callId, long elementId, const String& name, const String& value);
        void removeAttribute(long callId, long elementId, const String& name);
        void setTextNodeValue(long callId, long nodeId, const String& value);
        void getEventListenersForNode(long callId, long nodeId);

        // Methods called from the InspectorController.
        void setDocument(Document* document);
        void releaseDanglingNodes();

        void didInsertDOMNode(Node*);
        void didRemoveDOMNode(Node*);
        void didModifyDOMAttr(Element*);

        Node* nodeForId(long nodeId);
        Node* nodeForPath(const String& path);
        long pushNodePathToFrontend(Node* node);
        void pushChildNodesToFrontend(long nodeId);

   private:
        void startListening(Document* document);
        void stopListening(Document* document);

        virtual void handleEvent(ScriptExecutionContext*, Event* event);

        typedef HashMap<RefPtr<Node>, long> NodeToIdMap;
        long bind(Node* node, NodeToIdMap* nodesMap);
        void unbind(Node* node, NodeToIdMap* nodesMap);

        bool pushDocumentToFrontend();

        ScriptObject buildObjectForNode(Node* node, int depth, NodeToIdMap* nodesMap);
        ScriptArray buildArrayForElementAttributes(Element* element);
        ScriptArray buildArrayForContainerChildren(Node* container, int depth, NodeToIdMap* nodesMap);

        ScriptObject buildObjectForEventListener(const RegisteredEventListener& registeredEventListener, const AtomicString& eventType, Node* node);

        // We represent embedded doms as a part of the same hierarchy. Hence we treat children of frame owners differently.
        // We also skip whitespace text nodes conditionally. Following methods encapsulate these specifics.
        Node* innerFirstChild(Node* node);
        Node* innerNextSibling(Node* node);
        Node* innerPreviousSibling(Node* node);
        unsigned innerChildNodeCount(Node* node);
        Node* innerParentNode(Node* node);
        bool isWhitespace(Node* node);

        Document* mainFrameDocument() const;
        String documentURLString(Document* document) const;
        void discardBindings();

        InspectorFrontend* m_frontend;
        NodeToIdMap m_documentNodeToIdMap;
        // Owns node mappings for dangling nodes.
        Vector<NodeToIdMap*> m_danglingNodeToIdMaps;
        HashMap<long, Node*> m_idToNode;
        HashMap<long, NodeToIdMap*> m_idToNodesMap;
        HashSet<long> m_childrenRequested;
        long m_lastNodeId;
        ListHashSet<RefPtr<Document> > m_documents;
    };


} // namespace WebCore

#endif // !defined(InspectorDOMAgent_h)