// 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 XFA_FDE_CSS_CFDE_CSSSTYLESELECTOR_H_
#define XFA_FDE_CSS_CFDE_CSSSTYLESELECTOR_H_

#include <memory>
#include <vector>

#include "core/fxcrt/fx_basic.h"
#include "core/fxcrt/fx_system.h"
#include "xfa/fde/css/cfde_cssrulecollection.h"
#include "xfa/fde/css/fde_css.h"

class CFDE_CSSComputedStyle;
class CFDE_CSSCustomProperty;
class CFDE_CSSDeclaration;
class CFDE_CSSPropertyHolder;
class CFDE_CSSSelector;
class CFDE_CSSStyleSheet;
class CFDE_CSSValue;
class CFDE_CSSValueList;
class CFGAS_FontMgr;

class CFDE_CSSStyleSelector {
 public:
  explicit CFDE_CSSStyleSelector(CFGAS_FontMgr* pFontMgr);
  ~CFDE_CSSStyleSelector();

  void SetDefFontSize(FX_FLOAT fFontSize);
  void SetUAStyleSheet(std::unique_ptr<CFDE_CSSStyleSheet> pSheet);
  void UpdateStyleIndex();

  CFX_RetainPtr<CFDE_CSSComputedStyle> CreateComputedStyle(
      CFDE_CSSComputedStyle* pParentStyle);

  // Note, the dest style has to be an out param because the CXFA_TextParser
  // adds non-inherited data from the parent style. Attempting to copy
  // internally will fail as you'll lose the non-inherited data.
  void ComputeStyle(const std::vector<const CFDE_CSSDeclaration*>& declArray,
                    const CFX_WideString& styleString,
                    const CFX_WideString& alignString,
                    CFDE_CSSComputedStyle* pDestStyle);

  std::vector<const CFDE_CSSDeclaration*> MatchDeclarations(
      const CFX_WideString& tagname);

 private:
  bool MatchSelector(const CFX_WideString& tagname, CFDE_CSSSelector* pSel);

  void AppendInlineStyle(CFDE_CSSDeclaration* pDecl,
                         const CFX_WideString& style);
  void ApplyDeclarations(
      const std::vector<const CFDE_CSSDeclaration*>& declArray,
      const CFDE_CSSDeclaration* extraDecl,
      CFDE_CSSComputedStyle* pDestStyle);
  void ApplyProperty(FDE_CSSProperty eProperty,
                     const CFX_RetainPtr<CFDE_CSSValue>& pValue,
                     CFDE_CSSComputedStyle* pComputedStyle);
  void ExtractValues(const CFDE_CSSDeclaration* decl,
                     std::vector<const CFDE_CSSPropertyHolder*>* importants,
                     std::vector<const CFDE_CSSPropertyHolder*>* normals,
                     std::vector<const CFDE_CSSCustomProperty*>* custom);

  bool SetLengthWithPercent(FDE_CSSLength& width,
                            FDE_CSSPrimitiveType eType,
                            const CFX_RetainPtr<CFDE_CSSValue>& pValue,
                            FX_FLOAT fFontSize);
  FX_FLOAT ToFontSize(FDE_CSSPropertyValue eValue, FX_FLOAT fCurFontSize);
  FDE_CSSDisplay ToDisplay(FDE_CSSPropertyValue eValue);
  FDE_CSSTextAlign ToTextAlign(FDE_CSSPropertyValue eValue);
  uint16_t ToFontWeight(FDE_CSSPropertyValue eValue);
  FDE_CSSFontStyle ToFontStyle(FDE_CSSPropertyValue eValue);
  FDE_CSSVerticalAlign ToVerticalAlign(FDE_CSSPropertyValue eValue);
  uint32_t ToTextDecoration(const CFX_RetainPtr<CFDE_CSSValueList>& pList);
  FDE_CSSFontVariant ToFontVariant(FDE_CSSPropertyValue eValue);

  CFGAS_FontMgr* const m_pFontMgr;
  FX_FLOAT m_fDefFontSize;
  std::unique_ptr<CFDE_CSSStyleSheet> m_UAStyles;
  CFDE_CSSRuleCollection m_UARules;
};

#endif  // XFA_FDE_CSS_CFDE_CSSSTYLESELECTOR_H_