// Copyright 2014 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 FPDFSDK_PDFWINDOW_CPWL_WND_H_
#define FPDFSDK_PDFWINDOW_CPWL_WND_H_

#include <memory>
#include <vector>

#include "core/fpdfdoc/cpdf_formcontrol.h"
#include "core/fxcrt/cfx_observable.h"
#include "core/fxcrt/cfx_unowned_ptr.h"
#include "core/fxcrt/fx_basic.h"
#include "core/fxge/cfx_color.h"
#include "fpdfsdk/cpdfsdk_widget.h"
#include "fpdfsdk/pdfwindow/cpwl_timer.h"
#include "fpdfsdk/pdfwindow/cpwl_timer_handler.h"

class CPWL_Edit;
class CPWL_MsgControl;
class CPWL_ScrollBar;
class CPWL_Wnd;
class CFX_SystemHandler;
class IPVT_FontMap;
class IPWL_Provider;
struct PWL_SCROLL_INFO;

// window styles
#define PWS_CHILD 0x80000000L
#define PWS_BORDER 0x40000000L
#define PWS_BACKGROUND 0x20000000L
#define PWS_HSCROLL 0x10000000L
#define PWS_VSCROLL 0x08000000L
#define PWS_VISIBLE 0x04000000L
#define PWS_READONLY 0x01000000L
#define PWS_AUTOFONTSIZE 0x00800000L
#define PWS_AUTOTRANSPARENT 0x00400000L
#define PWS_NOREFRESHCLIP 0x00200000L

// edit and label styles
#define PES_MULTILINE 0x0001L
#define PES_PASSWORD 0x0002L
#define PES_LEFT 0x0004L
#define PES_RIGHT 0x0008L
#define PES_MIDDLE 0x0010L
#define PES_TOP 0x0020L
#define PES_BOTTOM 0x0040L
#define PES_CENTER 0x0080L
#define PES_CHARARRAY 0x0100L
#define PES_AUTOSCROLL 0x0200L
#define PES_AUTORETURN 0x0400L
#define PES_UNDO 0x0800L
#define PES_RICH 0x1000L
#define PES_SPELLCHECK 0x2000L
#define PES_TEXTOVERFLOW 0x4000L
#define PES_NOREAD 0x8000L

// listbox styles
#define PLBS_MULTIPLESEL 0x0001L
#define PLBS_HOVERSEL 0x0008L

// combobox styles
#define PCBS_ALLOWCUSTOMTEXT 0x0001L

#define PWL_CLASSNAME_EDIT "CPWL_Edit"

struct CPWL_Dash {
  CPWL_Dash() : nDash(0), nGap(0), nPhase(0) {}
  CPWL_Dash(int32_t dash, int32_t gap, int32_t phase)
      : nDash(dash), nGap(gap), nPhase(phase) {}

  void Reset() {
    nDash = 0;
    nGap = 0;
    nPhase = 0;
  }

  int32_t nDash;
  int32_t nGap;
  int32_t nPhase;
};

inline bool operator==(const CFX_Color& c1, const CFX_Color& c2) {
  return c1.nColorType == c2.nColorType && c1.fColor1 - c2.fColor1 < 0.0001 &&
         c1.fColor1 - c2.fColor1 > -0.0001 &&
         c1.fColor2 - c2.fColor2 < 0.0001 &&
         c1.fColor2 - c2.fColor2 > -0.0001 &&
         c1.fColor3 - c2.fColor3 < 0.0001 &&
         c1.fColor3 - c2.fColor3 > -0.0001 &&
         c1.fColor4 - c2.fColor4 < 0.0001 && c1.fColor4 - c2.fColor4 > -0.0001;
}

inline bool operator!=(const CFX_Color& c1, const CFX_Color& c2) {
  return !(c1 == c2);
}

#define PWL_SCROLLBAR_WIDTH 12.0f
#define PWL_SCROLLBAR_TRANSPARENCY 150
#define PWL_DEFAULT_SELBACKCOLOR \
  CFX_Color(COLORTYPE_RGB, 0, 51.0f / 255.0f, 113.0f / 255.0f)
#define PWL_DEFAULT_BLACKCOLOR CFX_Color(COLORTYPE_GRAY, 0)
#define PWL_DEFAULT_WHITECOLOR CFX_Color(COLORTYPE_GRAY, 1)

class IPWL_Provider : public CFX_Observable<IPWL_Provider> {
 public:
  virtual ~IPWL_Provider() {}

  // get a matrix which map user space to CWnd client space
  virtual CFX_Matrix GetWindowMatrix(void* pAttachedData) = 0;
};

class IPWL_FocusHandler {
 public:
  virtual ~IPWL_FocusHandler() {}
  virtual void OnSetFocus(CPWL_Edit* pEdit) = 0;
};

struct PWL_CREATEPARAM {
 public:
  PWL_CREATEPARAM();
  PWL_CREATEPARAM(const PWL_CREATEPARAM& other);

  void Reset() {
    rcRectWnd.Reset();
    pSystemHandler = nullptr;
    pFontMap = nullptr;
    pProvider.Reset();
    pFocusHandler = nullptr;
    dwFlags = 0;
    sBackgroundColor.Reset();
    pAttachedWidget.Reset();
    nBorderStyle = BorderStyle::SOLID;
    dwBorderWidth = 0;
    sBorderColor.Reset();
    sTextColor.Reset();
    nTransparency = 0;
    fFontSize = 0.0f;
    sDash.Reset();
    pAttachedData = nullptr;
    pParentWnd = nullptr;
    pMsgControl = nullptr;
    eCursorType = 0;
    mtChild.SetIdentity();
  }

  CFX_FloatRect rcRectWnd;                      // required
  CFX_SystemHandler* pSystemHandler;            // required
  IPVT_FontMap* pFontMap;                       // required
  IPWL_Provider::ObservedPtr pProvider;         // required
  IPWL_FocusHandler* pFocusHandler;             // optional
  uint32_t dwFlags;                             // optional
  CFX_Color sBackgroundColor;                   // optional
  CPDFSDK_Widget::ObservedPtr pAttachedWidget;  // required
  BorderStyle nBorderStyle;                     // optional
  int32_t dwBorderWidth;                        // optional
  CFX_Color sBorderColor;                       // optional
  CFX_Color sTextColor;                         // optional
  int32_t nTransparency;                        // optional
  float fFontSize;                              // optional
  CPWL_Dash sDash;                              // optional
  void* pAttachedData;                          // optional
  CPWL_Wnd* pParentWnd;                         // ignore
  CPWL_MsgControl* pMsgControl;                 // ignore
  int32_t eCursorType;                          // ignore
  CFX_Matrix mtChild;                           // ignore
};

class CPWL_Wnd : public CPWL_TimerHandler {
 public:
  CPWL_Wnd();
  ~CPWL_Wnd() override;

  virtual CFX_ByteString GetClassName() const;
  virtual void InvalidateRect(CFX_FloatRect* pRect = nullptr);

  virtual bool OnKeyDown(uint16_t nChar, uint32_t nFlag);
  virtual bool OnChar(uint16_t nChar, uint32_t nFlag);
  virtual bool OnLButtonDblClk(const CFX_PointF& point, uint32_t nFlag);
  virtual bool OnLButtonDown(const CFX_PointF& point, uint32_t nFlag);
  virtual bool OnLButtonUp(const CFX_PointF& point, uint32_t nFlag);
  virtual bool OnRButtonDown(const CFX_PointF& point, uint32_t nFlag);
  virtual bool OnRButtonUp(const CFX_PointF& point, uint32_t nFlag);
  virtual bool OnMouseMove(const CFX_PointF& point, uint32_t nFlag);
  virtual bool OnMouseWheel(short zDelta,
                            const CFX_PointF& point,
                            uint32_t nFlag);
  virtual void SetScrollInfo(const PWL_SCROLL_INFO& info);
  virtual void SetScrollPosition(float pos);
  virtual void ScrollWindowVertically(float pos);
  virtual void NotifyLButtonDown(CPWL_Wnd* child, const CFX_PointF& pos);
  virtual void NotifyLButtonUp(CPWL_Wnd* child, const CFX_PointF& pos);
  virtual void NotifyMouseMove(CPWL_Wnd* child, const CFX_PointF& pos);
  virtual void SetFocus();
  virtual void KillFocus();
  virtual void SetCursor();
  virtual void SetVisible(bool bVisible);
  virtual void SetFontSize(float fFontSize);
  virtual float GetFontSize() const;

  virtual CFX_WideString GetSelectedText();
  virtual CFX_FloatRect GetFocusRect() const;
  virtual CFX_FloatRect GetClientRect() const;

  void InvalidateFocusHandler(IPWL_FocusHandler* handler);
  void InvalidateProvider(IPWL_Provider* provider);
  void Create(const PWL_CREATEPARAM& cp);
  void Destroy();
  void Move(const CFX_FloatRect& rcNew, bool bReset, bool bRefresh);

  void SetCapture();
  void ReleaseCapture();

  void DrawAppearance(CFX_RenderDevice* pDevice, CFX_Matrix* pUser2Device);

  CFX_Color GetBackgroundColor() const;
  void SetBackgroundColor(const CFX_Color& color);
  CFX_Color GetBorderColor() const;
  CFX_Color GetTextColor() const;
  void SetTextColor(const CFX_Color& color);
  CFX_Color GetBorderLeftTopColor(BorderStyle nBorderStyle) const;
  CFX_Color GetBorderRightBottomColor(BorderStyle nBorderStyle) const;

  void SetBorderStyle(BorderStyle eBorderStyle);
  BorderStyle GetBorderStyle() const;
  const CPWL_Dash& GetBorderDash() const;

  int32_t GetBorderWidth() const;
  int32_t GetInnerBorderWidth() const;
  CFX_FloatRect GetWindowRect() const;
  CFX_PointF GetCenterPoint() const;

  bool IsVisible() const { return m_bVisible; }
  bool HasFlag(uint32_t dwFlags) const;
  void AddFlag(uint32_t dwFlags);
  void RemoveFlag(uint32_t dwFlags);

  void SetClipRect(const CFX_FloatRect& rect);
  const CFX_FloatRect& GetClipRect() const;

  CPWL_Wnd* GetParentWindow() const;
  void* GetAttachedData() const;

  bool WndHitTest(const CFX_PointF& point) const;
  bool ClientHitTest(const CFX_PointF& point) const;
  bool IsCaptureMouse() const;

  void EnableWindow(bool bEnable);
  bool IsEnabled() const { return m_bEnabled; }
  const CPWL_Wnd* GetFocused() const;
  bool IsFocused() const;
  bool IsReadOnly() const;
  CPWL_ScrollBar* GetVScrollBar() const;

  IPVT_FontMap* GetFontMap() const;
  IPWL_Provider* GetProvider() const;
  IPWL_FocusHandler* GetFocusHandler() const;

  int32_t GetTransparency();
  void SetTransparency(int32_t nTransparency);

  CFX_Matrix GetChildToRoot() const;
  CFX_Matrix GetChildMatrix() const;
  void SetChildMatrix(const CFX_Matrix& mt);
  CFX_Matrix GetWindowMatrix() const;

 protected:
  friend class CPWL_MsgControl;

  // CPWL_TimerHandler
  CFX_SystemHandler* GetSystemHandler() const override;

  virtual void CreateChildWnd(const PWL_CREATEPARAM& cp);
  virtual void RePosChildWnd();
  virtual void GetThisAppearanceStream(std::ostringstream* psAppStream);

  virtual void DrawThisAppearance(CFX_RenderDevice* pDevice,
                                  CFX_Matrix* pUser2Device);

  virtual void OnCreate(PWL_CREATEPARAM& cp);
  virtual void OnCreated();
  virtual void OnDestroy();

  virtual void OnSetFocus();
  virtual void OnKillFocus();

  void GetAppearanceStream(std::ostringstream* psAppStream);
  void SetNotifyFlag(bool bNotifying = true) { m_bNotifying = bNotifying; }

  bool IsValid() const;
  const PWL_CREATEPARAM& GetCreationParam() const;
  bool IsNotifying() const { return m_bNotifying; }

  void InvalidateRectMove(const CFX_FloatRect& rcOld,
                          const CFX_FloatRect& rcNew);

  bool IsWndCaptureMouse(const CPWL_Wnd* pWnd) const;
  bool IsWndCaptureKeyboard(const CPWL_Wnd* pWnd) const;
  const CPWL_Wnd* GetRootWnd() const;

  bool IsCTRLpressed(uint32_t nFlag) const;
  bool IsSHIFTpressed(uint32_t nFlag) const;
  bool IsALTpressed(uint32_t nFlag) const;

 private:
  CFX_PointF ParentToChild(const CFX_PointF& point) const;
  CFX_FloatRect ParentToChild(const CFX_FloatRect& rect) const;

  void GetChildAppearanceStream(std::ostringstream* psAppStream);
  void DrawChildAppearance(CFX_RenderDevice* pDevice, CFX_Matrix* pUser2Device);

  FX_RECT PWLtoWnd(const CFX_FloatRect& rect) const;

  void AddChild(CPWL_Wnd* pWnd);
  void RemoveChild(CPWL_Wnd* pWnd);

  void CreateScrollBar(const PWL_CREATEPARAM& cp);
  void CreateVScrollBar(const PWL_CREATEPARAM& cp);

  void AdjustStyle();
  void CreateMsgControl();
  void DestroyMsgControl();

  CPWL_MsgControl* GetMsgControl() const;

  std::vector<CPWL_Wnd*> m_Children;
  PWL_CREATEPARAM m_sPrivateParam;
  CFX_UnownedPtr<CPWL_ScrollBar> m_pVScrollBar;
  CFX_FloatRect m_rcWindow;
  CFX_FloatRect m_rcClip;
  bool m_bCreated;
  bool m_bVisible;
  bool m_bNotifying;
  bool m_bEnabled;
};

#endif  // FPDFSDK_PDFWINDOW_CPWL_WND_H_