/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef StyleSheetCollection_h
#define StyleSheetCollection_h

#include "core/dom/Document.h"
#include "core/dom/DocumentOrderedList.h"
#include "core/dom/StyleSheetScopingNodeList.h"
#include "core/dom/TreeScope.h"
#include "wtf/FastAllocBase.h"
#include "wtf/HashMap.h"
#include "wtf/ListHashSet.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

class ContainerNode;
class CSSStyleSheet;
class StyleEngine;
class Node;
class StyleSheet;
class StyleSheetContents;
class StyleSheetList;

// FIXME: Should be in separate file and be renamed like:
// - StyleSheetCollectionBase -> StyleSheetCollection
// - StyleSheetCollection -> ScopeStyleSheetCollection
//
class StyleSheetCollectionBase {
    WTF_MAKE_NONCOPYABLE(StyleSheetCollectionBase); WTF_MAKE_FAST_ALLOCATED;
public:
    StyleSheetCollectionBase();
    ~StyleSheetCollectionBase();

    Vector<RefPtr<CSSStyleSheet> >& activeAuthorStyleSheets() { return m_activeAuthorStyleSheets; }
    Vector<RefPtr<StyleSheet> >& styleSheetsForStyleSheetList() { return m_styleSheetsForStyleSheetList; }
    const Vector<RefPtr<CSSStyleSheet> >& activeAuthorStyleSheets() const { return m_activeAuthorStyleSheets; }
    const Vector<RefPtr<StyleSheet> >& styleSheetsForStyleSheetList() const { return m_styleSheetsForStyleSheetList; }

    void swap(StyleSheetCollectionBase&);
    void appendActiveStyleSheets(const Vector<RefPtr<CSSStyleSheet> >&);
    void appendActiveStyleSheet(CSSStyleSheet*);
    void appendSheetForList(StyleSheet*);

protected:
    Vector<RefPtr<StyleSheet> > m_styleSheetsForStyleSheetList;
    Vector<RefPtr<CSSStyleSheet> > m_activeAuthorStyleSheets;
};


class StyleSheetCollection : public StyleSheetCollectionBase {
public:
    void addStyleSheetCandidateNode(Node*, bool createdByParser);
    void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode);
    bool hasStyleSheetCandidateNodes() const { return !m_styleSheetCandidateNodes.isEmpty(); }


    bool usesRemUnits() const { return m_usesRemUnits; }

    DocumentOrderedList& styleSheetCandidateNodes() { return m_styleSheetCandidateNodes; }
    DocumentOrderedList* scopingNodesForStyleScoped() { return m_scopingNodesForStyleScoped.scopingNodes(); }
    ListHashSet<Node*, 4>* scopingNodesRemoved() { return m_scopingNodesForStyleScoped.scopingNodesRemoved(); }

    void clearMediaQueryRuleSetStyleSheets();

protected:
    explicit StyleSheetCollection(TreeScope&);

    Document* document() { return m_treeScope.documentScope(); }

    enum StyleResolverUpdateType {
        Reconstruct,
        Reset,
        Additive,
        ResetStyleResolverAndFontSelector
    };

    struct StyleSheetChange {
        StyleResolverUpdateType styleResolverUpdateType;
        bool requiresFullStyleRecalc;

        StyleSheetChange()
            : styleResolverUpdateType(Reconstruct)
            , requiresFullStyleRecalc(true) { }
    };

    void analyzeStyleSheetChange(StyleResolverUpdateMode, const StyleSheetCollectionBase&, StyleSheetChange&);
    void resetAllRuleSetsInTreeScope(StyleResolver*);
    void updateUsesRemUnits();

private:
    static StyleResolverUpdateType compareStyleSheets(const Vector<RefPtr<CSSStyleSheet> >& oldStyleSheets, const Vector<RefPtr<CSSStyleSheet> >& newStylesheets, Vector<StyleSheetContents*>& addedSheets);
    bool activeLoadingStyleSheetLoaded(const Vector<RefPtr<CSSStyleSheet> >& newStyleSheets);

protected:
    TreeScope& m_treeScope;
    bool m_hadActiveLoadingStylesheet;
    bool m_usesRemUnits;

    DocumentOrderedList m_styleSheetCandidateNodes;
    StyleSheetScopingNodeList m_scopingNodesForStyleScoped;
};

}

#endif