// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#ifndef CORE_FPDFDOC_CPDF_STRUCTELEMENT_H_
#define CORE_FPDFDOC_CPDF_STRUCTELEMENT_H_

#include <vector>

#include "core/fxcrt/cfx_retain_ptr.h"
#include "core/fxcrt/fx_string.h"
#include "core/fxge/fx_dib.h"

class CPDF_Dictionary;
class CPDF_Object;
class CPDF_StructElement;
class CPDF_StructTree;

class CPDF_StructKid {
 public:
  CPDF_StructKid();
  CPDF_StructKid(const CPDF_StructKid& that);
  ~CPDF_StructKid();

  enum { Invalid, Element, PageContent, StreamContent, Object } m_Type;

  CFX_RetainPtr<CPDF_StructElement> m_pElement;  // For Element.
  CPDF_Dictionary* m_pDict;                      // For Element.
  uint32_t m_PageObjNum;  // For PageContent, StreamContent, Object.
  uint32_t m_RefObjNum;   // For StreamContent, Object.
  uint32_t m_ContentId;   // For PageContent, StreamContent.
};

class CPDF_StructElement : public CFX_Retainable {
 public:
  template <typename T, typename... Args>
  friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);

  CPDF_StructTree* GetTree() const { return m_pTree; }
  const CFX_ByteString& GetType() const { return m_Type; }
  CPDF_StructElement* GetParent() const { return m_pParent; }
  CPDF_Dictionary* GetDict() const { return m_pDict; }

  int CountKids() const;
  CPDF_StructElement* GetKidIfElement(int index) const;
  CPDF_Object* GetAttr(const CFX_ByteStringC& owner,
                       const CFX_ByteStringC& name,
                       bool bInheritable = false,
                       float fLevel = 0.0F);
  CFX_ByteString GetName(const CFX_ByteStringC& owner,
                         const CFX_ByteStringC& name,
                         const CFX_ByteStringC& default_value,
                         bool bInheritable = false,
                         int subindex = -1);
  FX_ARGB GetColor(const CFX_ByteStringC& owner,
                   const CFX_ByteStringC& name,
                   FX_ARGB default_value,
                   bool bInheritable = false,
                   int subindex = -1);
  float GetNumber(const CFX_ByteStringC& owner,
                  const CFX_ByteStringC& name,
                  float default_value,
                  bool bInheritable = false,
                  int subindex = -1);
  int GetInteger(const CFX_ByteStringC& owner,
                 const CFX_ByteStringC& name,
                 int default_value,
                 bool bInheritable = false,
                 int subindex = -1);

  std::vector<CPDF_StructKid>* GetKids() { return &m_Kids; }
  void LoadKids(CPDF_Dictionary* pDict);
  void LoadKid(uint32_t PageObjNum, CPDF_Object* pObj, CPDF_StructKid* pKid);
  CPDF_Object* GetAttr(const CFX_ByteStringC& owner,
                       const CFX_ByteStringC& name,
                       bool bInheritable,
                       int subindex);

 private:
  CPDF_StructElement(CPDF_StructTree* pTree,
                     CPDF_StructElement* pParent,
                     CPDF_Dictionary* pDict);
  ~CPDF_StructElement() override;

  CPDF_StructTree* const m_pTree;
  CPDF_StructElement* const m_pParent;
  CPDF_Dictionary* const m_pDict;
  CFX_ByteString m_Type;
  std::vector<CPDF_StructKid> m_Kids;
};

#endif  // CORE_FPDFDOC_CPDF_STRUCTELEMENT_H_