/*
 *  Copyright (C) 2005-2018 Team Kodi
 *  This file is part of Kodi - https://kodi.tv
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *  See LICENSES/README.md for more information.
 */

#pragma once

#include "windowing/XBMC_events.h"

#define XBMC_BUTTON(X) (1 << ((X)-1))
#define XBMC_BUTTON_LEFT 1
#define XBMC_BUTTON_MIDDLE 2
#define XBMC_BUTTON_RIGHT 3
#define XBMC_BUTTON_WHEELUP 4
#define XBMC_BUTTON_WHEELDOWN 5
#define XBMC_BUTTON_X1 6
#define XBMC_BUTTON_X2 7
#define XBMC_BUTTON_X3 8
#define XBMC_BUTTON_X4 9
#define XBMC_BUTTON_LMASK XBMC_BUTTON(XBMC_BUTTON_LEFT)
#define XBMC_BUTTON_MMASK XBMC_BUTTON(XBMC_BUTTON_MIDDLE)
#define XBMC_BUTTON_RMASK XBMC_BUTTON(XBMC_BUTTON_RIGHT)
#define XBMC_BUTTON_X1MASK XBMC_BUTTON(XBMC_BUTTON_X1)
#define XBMC_BUTTON_X2MASK XBMC_BUTTON(XBMC_BUTTON_X2)
#define XBMC_BUTTON_X3MASK XBMC_BUTTON(XBMC_BUTTON_X3)
#define XBMC_BUTTON_X4MASK XBMC_BUTTON(XBMC_BUTTON_X4)

#define MOUSE_MINIMUM_MOVEMENT 2
#define MOUSE_DOUBLE_CLICK_LENGTH 500L
#define MOUSE_ACTIVE_LENGTH 5000L

#define MOUSE_MAX_BUTTON 7

enum MOUSE_STATE
{
  /*! Normal state */
  MOUSE_STATE_NORMAL = 1,
  /*! Control below the mouse is currently in focus */
  MOUSE_STATE_FOCUS,
  /*! A drag operation is being performed */
  MOUSE_STATE_DRAG,
  /*! A mousebutton is being clicked */
  MOUSE_STATE_CLICK
};

enum MOUSE_BUTTON
{
  MOUSE_LEFT_BUTTON = 0,
  MOUSE_RIGHT_BUTTON,
  MOUSE_MIDDLE_BUTTON,
  MOUSE_EXTRA_BUTTON1,
  MOUSE_EXTRA_BUTTON2,
  MOUSE_EXTRA_BUTTON3,
  MOUSE_EXTRA_BUTTON4
};

enum class HoldAction
{
  /*! No action should occur */
  NONE,
  /*! A drag action has started */
  DRAG_START,
  /*! A drag action is in progress */
  DRAG,
  /*! A drag action has finished */
  DRAG_END
};

//! Holds everything we know about the current state of the mouse
struct MouseState
{
  /*! X location */
  int x;
  /*! Y location */
  int y;
  /*! Change in x */
  int16_t dx;
  /*! Change in y */
  int16_t dy;
  /*! Change in z (wheel) */
  int8_t dz;
  /*! Current state of the buttons */
  bool button[MOUSE_MAX_BUTTON];
  /*! True if the mouse is active */
  bool active;
};

struct MousePosition
{
  int x;
  int y;
};

class CAction;

class CMouseStat
{
public:
  CMouseStat();
  virtual ~CMouseStat();

  void Initialize();
  void HandleEvent(const XBMC_Event& newEvent);
  void SetResolution(int maxX, int maxY, float speedX, float speedY);
  bool IsActive();
  bool IsEnabled() const;

  void SetActive(bool active = true);
  void SetState(MOUSE_STATE state) { m_pointerState = state; }
  void SetEnabled(bool enabled = true);
  MOUSE_STATE GetState() const { return m_pointerState; }
  uint32_t GetKey() const;

  HoldAction GetHold(int ButtonID) const;
  inline int GetX(void) const { return m_mouseState.x; }
  inline int GetY(void) const { return m_mouseState.y; }
  inline int GetDX(void) const { return m_mouseState.dx; }
  inline int GetDY(void) const { return m_mouseState.dy; }
  MousePosition GetPosition() { return MousePosition{m_mouseState.x, m_mouseState.y}; }

private:
  /*! \brief Holds information regarding a particular mouse button state

   The CButtonState class is used to track where in a button event the mouse currently is.
   There is effectively 5 BUTTON_STATE's available, and transitioning between those states
   is handled by the Update() function.

   The actions we detect are:
    * short clicks - down/up press of the mouse within short_click_time ms, where the pointer stays
      within click_confines pixels
    * long clicks - down/up press of the mouse greater than short_click_time ms, where the pointers
      stays within click_confines pixels
    * double clicks - a further down press of the mouse within double_click_time of the up press of
      a short click, where the pointer stays within click_confines pixels
    * drag - the mouse is down and has been moved more than click_confines pixels

   \sa CMouseStat
  */
  class CButtonState
  {
  public:
    /*! \brief enum for the actions to perform as a result of an Update function
     */
    enum BUTTON_ACTION
    {
      MB_NONE = 0, ///< no action should occur
      MB_SHORT_CLICK, ///< a short click has occurred (a double click may be in process)
      MB_LONG_CLICK, ///< a long click has occurred
      MB_DOUBLE_CLICK, ///< a double click has occurred
      MB_DRAG_START, ///< a drag action has started
      MB_DRAG, ///< a drag action is in progress
      MB_DRAG_END
    }; ///< a drag action has finished

    CButtonState();

    /*! \brief Update the button state, with where the mouse is, and whether the button is down or
     not

     \param time frame time in ms
     \param x horizontal coordinate of the mouse
     \param y vertical coordinate of the mouse
     \param down true if the button is down
     \return action that should be performed
     */
    BUTTON_ACTION Update(unsigned int time, int x, int y, bool down);

  private:
    //! number of pixels that the pointer may move while the button is down to
    //! trigger a click
    static const unsigned int click_confines = 5;

    //! Time for mouse down/up to trigger a short click rather than a long click
    static const unsigned int short_click_time = 1000;

    //! Time for mouse down following a short click to trigger a double click
    static const unsigned int double_click_time = 500;

    bool InClickRange(int x, int y) const;

    enum BUTTON_STATE
    {
      STATE_RELEASED = 0, ///< mouse button is released, no events pending
      STATE_IN_CLICK, ///< mouse button is down, a click is pending
      STATE_IN_DOUBLE_CLICK, ///< mouse button is released, pending double click
      STATE_IN_DOUBLE_IGNORE, ///< mouse button is down following double click
      STATE_IN_DRAG
    }; ///< mouse button is down during a drag

    BUTTON_STATE m_state;
    unsigned int m_time;
    int m_x;
    int m_y;
  };

  /*! \brief detect whether the mouse has moved

   Uses a trigger threshold of 2 pixels to detect mouse movement

   \return whether the mouse has moved past the trigger threshold.
   */
  bool MovedPastThreshold() const;

  // state of the mouse
  MOUSE_STATE m_pointerState{MOUSE_STATE_NORMAL};
  MouseState m_mouseState{};
  bool m_mouseEnabled;
  CButtonState m_buttonState[MOUSE_MAX_BUTTON];

  int m_maxX{0};
  int m_maxY{0};
  float m_speedX{0.0f};
  float m_speedY{0.0f};

  // active/click timers
  unsigned int m_lastActiveTime;

  bool bClick[MOUSE_MAX_BUTTON]{};
  bool bDoubleClick[MOUSE_MAX_BUTTON]{};
  HoldAction m_hold[MOUSE_MAX_BUTTON]{};
  bool bLongClick[MOUSE_MAX_BUTTON]{};

  uint32_t m_Key;
};