/*
 * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2012 Research In Motion Limited. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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 HistoryItem_h
#define HistoryItem_h

#include "bindings/v8/SerializedScriptValue.h"
#include "platform/geometry/IntPoint.h"
#include "wtf/RefCounted.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

class Document;
class FormData;
class HistoryItem;
class Image;
class KURL;
class ResourceRequest;

typedef Vector<RefPtr<HistoryItem> > HistoryItemVector;

class HistoryItem : public RefCounted<HistoryItem> {
public:
    static PassRefPtr<HistoryItem> create() { return adoptRef(new HistoryItem); }

    ~HistoryItem();

    PassRefPtr<HistoryItem> copy() const;

    // Resets the HistoryItem to its initial state, as returned by create().
    void reset();

    const String& originalURLString() const;
    const String& urlString() const;
    KURL url() const;
    KURL originalURL() const;

    const String& referrer() const;
    const String& target() const;

    FormData* formData();
    String formContentType() const;

    const IntPoint& scrollPoint() const;
    void setScrollPoint(const IntPoint&);
    void clearScrollPoint();

    float pageScaleFactor() const;
    void setPageScaleFactor(float);

    const Vector<String>& documentState() const;
    void setDocumentState(const Vector<String>&);
    void clearDocumentState();

    void setURL(const KURL&);
    void setURLString(const String&);
    void setOriginalURLString(const String&);
    void setReferrer(const String&);
    void setTarget(const String&);

    void setStateObject(PassRefPtr<SerializedScriptValue> object);
    SerializedScriptValue* stateObject() const { return m_stateObject.get(); }

    void setItemSequenceNumber(long long number) { m_itemSequenceNumber = number; }
    long long itemSequenceNumber() const { return m_itemSequenceNumber; }

    void setDocumentSequenceNumber(long long number) { m_documentSequenceNumber = number; }
    long long documentSequenceNumber() const { return m_documentSequenceNumber; }

    void setTargetFrameID(int64_t id) { m_targetFrameID = id; }
    int64_t targetFrameID() const { return m_targetFrameID; }

    void setFormInfoFromRequest(const ResourceRequest&);
    void setFormData(PassRefPtr<FormData>);
    void setFormContentType(const String&);

    void addChildItem(PassRefPtr<HistoryItem>);
    void setChildItem(PassRefPtr<HistoryItem>);
    HistoryItem* childItemWithTarget(const String&) const;
    HistoryItem* childItemWithDocumentSequenceNumber(long long number) const;
    const HistoryItemVector& children() const;
    void clearChildren();

    bool shouldDoSameDocumentNavigationTo(HistoryItem* otherItem) const;
    bool hasSameFrames(HistoryItem* otherItem) const;

    bool isCurrentDocument(Document*) const;

#ifndef NDEBUG
    int showTree() const;
    int showTreeWithIndent(unsigned indentLevel) const;
#endif

private:
    HistoryItem();
    explicit HistoryItem(const HistoryItem&);

    bool hasSameDocumentTree(HistoryItem* otherItem) const;

    String m_urlString;
    String m_originalURLString;
    String m_referrer;
    String m_target;

    IntPoint m_scrollPoint;
    float m_pageScaleFactor;
    Vector<String> m_documentState;

    HistoryItemVector m_children;

    // If two HistoryItems have the same item sequence number, then they are
    // clones of one another.  Traversing history from one such HistoryItem to
    // another is a no-op.  HistoryItem clones are created for parent and
    // sibling frames when only a subframe navigates.
    int64_t m_itemSequenceNumber;

    // If two HistoryItems have the same document sequence number, then they
    // refer to the same instance of a document.  Traversing history from one
    // such HistoryItem to another preserves the document.
    int64_t m_documentSequenceNumber;

    int64_t m_targetFrameID;

    // Support for HTML5 History
    RefPtr<SerializedScriptValue> m_stateObject;

    // info used to repost form data
    RefPtr<FormData> m_formData;
    String m_formContentType;

}; //class HistoryItem

} //namespace WebCore

#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
extern "C" int showTree(const WebCore::HistoryItem*);
#endif

#endif // HISTORYITEM_H