/*
 * Copyright (C) 2012, 2015 Apple Inc. All rights reserved.
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 * 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 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
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 */

#ifndef InspectorLayerTreeAgent_h
#define InspectorLayerTreeAgent_h

#include "InspectorWebAgentBase.h"
#include "RenderLayer.h"
#include <inspector/InspectorBackendDispatchers.h>
#include <inspector/InspectorFrontendDispatchers.h>
#include <inspector/InspectorProtocolObjects.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

typedef String ErrorString;

class InspectorLayerTreeAgent final : public InspectorAgentBase, public Inspector::LayerTreeBackendDispatcherHandler {
    WTF_MAKE_FAST_ALLOCATED;
public:
    explicit InspectorLayerTreeAgent(WebAgentContext&);
    virtual ~InspectorLayerTreeAgent();

    virtual void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) override;
    virtual void willDestroyFrontendAndBackend(Inspector::DisconnectReason) override;
    void reset();

    // InspectorInstrumentation callbacks.
    void layerTreeDidChange();
    void renderLayerDestroyed(const RenderLayer&);
    void pseudoElementDestroyed(PseudoElement&);

    // Called from the front-end.
    virtual void enable(ErrorString&) override;
    virtual void disable(ErrorString&) override;
    virtual void layersForNode(ErrorString&, int nodeId, RefPtr<Inspector::Protocol::Array<Inspector::Protocol::LayerTree::Layer>>&) override;
    virtual void reasonsForCompositingLayer(ErrorString&, const String& layerId, RefPtr<Inspector::Protocol::LayerTree::CompositingReasons>&) override;

private:
    // RenderLayer-related methods.
    String bind(const RenderLayer*);
    void unbind(const RenderLayer*);

    void gatherLayersUsingRenderObjectHierarchy(ErrorString&, RenderObject*, RefPtr<Inspector::Protocol::Array<Inspector::Protocol::LayerTree::Layer>>&);
    void gatherLayersUsingRenderLayerHierarchy(ErrorString&, RenderLayer*, RefPtr<Inspector::Protocol::Array<Inspector::Protocol::LayerTree::Layer>>&);

    Ref<Inspector::Protocol::LayerTree::Layer> buildObjectForLayer(ErrorString&, RenderLayer*);
    Ref<Inspector::Protocol::LayerTree::IntRect> buildObjectForIntRect(const IntRect&);

    int idForNode(ErrorString&, Node*);

    String bindPseudoElement(PseudoElement*);
    void unbindPseudoElement(PseudoElement*);

    std::unique_ptr<Inspector::LayerTreeFrontendDispatcher> m_frontendDispatcher;
    RefPtr<Inspector::LayerTreeBackendDispatcher> m_backendDispatcher;

    HashMap<const RenderLayer*, String> m_documentLayerToIdMap;
    HashMap<String, const RenderLayer*> m_idToLayer;

    HashMap<PseudoElement*, String> m_pseudoElementToIdMap;
    HashMap<String, PseudoElement*> m_idToPseudoElement;
};

} // namespace WebCore

#endif // !defined(InspectorLayerTreeAgent_h)