/********************************************************************** <BR>
  This file is part of Crack dot Com's free source code release of
  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
  information about compiling & licensing issues visit this URL</a> 
  <PRE> If that doesn't help, contact Jonathan Clark at 
  golgotha_source@usa.net (Subject should have "GOLG" in it) 
***********************************************************************/

#ifndef __EVENT_HPP_
#define __EVENT_HPP_

#include "arch.hh"
#include "time/time.hh"
#include <stdlib.h>

// Event summary :
/*
  
  all events should be derived from i4_event. 
  All events should have a type() and copy() function defined.  Since all user application events
  should be be OBJECT_MESSAGE or USER_MESSAGE type does not need to be defined.

  An object_message is usefull for scoping object messages to yourself specifically.  Each object
  can then have it's own event name-space.  A USER_MESSAGE uses a global name-space and
  should probably only be used in the main program.

  A events default to being sent ANYTIME, but be over-riding the when() function.  
  Events can be sent
  LATER. (i.e. qued up and sent at another time... hence the need for a copy() function). or NOW.
  If an event returns ANYTIME for when() the implementation choses.  This currently default to NOW.

  Events should be sent through a channel and not directly.  i.e.

  either :
  i4_kernel.send_to(send_to,&ev);
  or
  i4_time_dev.request_event(send_to,&ev,time);

  note : events are passed as pointers to event.

  whenever you receive_event() you should first check it's 
  type throught the type() function. Then you
  should CAST_PTR into the event type it actually is : example
  void receive_event(i4_event *ev)
  {
    if (ev->type()==i4_event::KEY_PRESS)
    {
      CAST_PTR(key_ev,i4_key_press_event_class,ev);
      printf("Key pressed %d\n",key_ev->key);
    }
  }

  IMPORTANT : if you are derived from a parent who has a receive_event() 
  you most likely want to call it
  or you will not get any of it's default behaviors.  This is especially true 
  with i4_window_class derivatives.

  Note that keycodes are defined in event/keys.hh
*/



class i4_event
{
public:
  enum event_type  
    {
    MOUSE_MOVE, 
    MOUSE_BUTTON_DOWN, 
    MOUSE_BUTTON_UP, 
    KEY_PRESS, 
    KEY_RELEASE, 
    SYSTEM_SIGNAL,    // CTRL-C, BUS, PIPE, etc
    WINDOW_MESSAGE,   // Events only seen by windows
    DISPLAY_CHANGE,   // When a refresh is need ore resolution changes
    DISPLAY_CLOSE,    // when close button on window is clicked, or the like
    OBJECT_MESSAGE,   // events specific to a specific instance (uses memory address to clarify)
    QUERY_MESSAGE,    // used by gui/ objects for querying and returning info
    USER_MESSAGE,     // global user evetns
    DO_COMMAND,
    END_COMMAND,      // sent when key or menu item is depressed
    IDLE_MESSAGE
  } ;
  
  enum dispatch_time
    {
    ANYTIME,
    NOW,
    LATER
  };
  
  // most events can be sent now or defered, if you need to be defered till later or sent
  // immidately, this can be replaced
  virtual dispatch_time when() { return ANYTIME; }  

  virtual event_type type() = 0;
  virtual i4_event  *copy() = 0;
  virtual ~i4_event() { ; }

  // translates any coordinates to client's window space
  virtual void move(int x_offset, int y_offset) { ; } 

#ifndef I4_RETAIL
  virtual char *name() = 0;
#endif
};

class i4_mouse_move_event_class         : public i4_event
{
public:
  i4_coord lx,ly;  // last x,y
  i4_coord x,y;

  virtual event_type type() { return MOUSE_MOVE; }
  virtual i4_event  *copy() { return new i4_mouse_move_event_class(lx,ly,x,y); }
  i4_mouse_move_event_class(i4_coord lx, i4_coord ly, i4_coord x, i4_coord y) 
    : lx(lx), ly(ly), x(x),y(y) {}
  char *name() { return "mouse_move"; }

  void move(int x_offset, int y_offset) 
  { 
    x+=x_offset; y+=y_offset; 
    lx+=x_offset; ly+=y_offset;
  }
} ;


class i4_mouse_button_event_class : public i4_event
{
public:
  enum btype { LEFT, CENTER, RIGHT } but;
  i4_coord x, y;                        // position mouse was at
  i4_time_class time, last_time;        // time pressed/depressed, time was last pressed/depressed
  i4_bool double_click;                 // set by the window manager

  virtual event_type type() = 0;
  virtual i4_event  *copy() = 0;
#ifndef I4_RETAIL
  virtual char *name() = 0;
#endif

  i4_bool left() { return (i4_bool)(but==LEFT); }
  i4_bool right() { return (i4_bool)(but==RIGHT); }
  i4_bool center() { return (i4_bool)(but==CENTER); }

  i4_mouse_button_event_class(btype but,
                              i4_coord x, i4_coord y,
                              i4_time_class time, i4_time_class last_time,
                              i4_bool double_click=i4_F)
    : but(but), x(x), y(y), time(time), last_time(last_time), double_click(double_click) {}

  void move(int x_offset, int y_offset) { x+=x_offset; y+=y_offset; }

};

class i4_mouse_button_down_event_class  : public i4_mouse_button_event_class
{
public:
  event_type type() { return MOUSE_BUTTON_DOWN; }

  i4_mouse_button_down_event_class(btype but,
                                   i4_coord x, i4_coord y,
                                   i4_time_class time, i4_time_class last_time,
                                   i4_bool double_click=i4_F)
    : i4_mouse_button_event_class(but,x,y, time, last_time, double_click) {}

  virtual i4_event  *copy() 
  { 
    return new i4_mouse_button_down_event_class(but,x,y,time,last_time, double_click); 
  }

  char *name() { return "mouse_button_down"; }
} ;

class i4_mouse_button_up_event_class    : public i4_mouse_button_event_class
{
public:
  virtual event_type type() { return MOUSE_BUTTON_UP; }
  i4_mouse_button_up_event_class(btype but,
                                 i4_coord x, i4_coord y,
                                 i4_time_class time, i4_time_class last_time,
                                 i4_bool double_click=i4_F)
    : i4_mouse_button_event_class(but,x,y, time, last_time, double_click) {}

  virtual i4_event  *copy() 
  { 
    return new i4_mouse_button_up_event_class(but,x,y,time,last_time, double_click); 
  }

  char *name() { return "mouse_button_up"; }
} ;


class i4_do_command_event_class          : public i4_event
{
public:
  i4_time_class time;
  char  command[64];
  int   command_id;

  i4_do_command_event_class(char *_command, int command_id);
  i4_do_command_event_class(char *_command, int command_id, i4_time_class &time);
  virtual event_type type() { return DO_COMMAND; } 
  virtual i4_event  *copy();
  char *name() { return "do_command"; }
} ;


class i4_end_command_event_class          : public i4_event
{
public:
  i4_time_class time;
  char  command[64];
  int   command_id;

  i4_end_command_event_class(char *command, int command_id, i4_time_class &time);
  i4_end_command_event_class(char *command, int command_id);


  virtual event_type type() { return END_COMMAND; } 
  virtual i4_event  *copy() { return new i4_end_command_event_class(command, command_id, time); }
  char *name() { return "end_command"; }
} ;


class i4_key_press_event_class          : public i4_event
{
public:
  i4_time_class time;

  w16 key,        // includes shift info
    key_code,     // raw key code
    modifiers;    // includes shift, ctrl, alt, num-lock etc

  i4_key_press_event_class(w16 key, w16 key_code, w16 modifiers, i4_time_class &time)
    : key(key), key_code(key_code), modifiers(modifiers), time(time) {}
  virtual event_type type() { return KEY_PRESS; }
  virtual i4_event  *copy() { return new i4_key_press_event_class(key,key_code,modifiers,time); }
  char *name() { return "key_press"; }
} ;

class i4_key_release_event_class        : public i4_event
{
public:
  i4_time_class time;

  w16 key, key_code, modifiers;

  i4_key_release_event_class(w16 key, w16 key_code, w16 modifiers, i4_time_class &time)
    : key(key), key_code(key_code), modifiers(modifiers), time(time) {}
  virtual event_type type() { return KEY_RELEASE; }
  virtual i4_event  *copy() { return new i4_key_release_event_class(key,key_code,modifiers,time); }
  char *name() { return "key_release"; }
} ;

class i4_display_class;
class i4_display_change_event_class     : public i4_event
{
public:
  i4_display_class *display;
  enum change_type
    {
    SIZE_CHANGE,      // resolution change
    PALETTE_CHANGE,   // color mapping changed (not implemented yet)
    LOCATION_CHANGE   // screen changed location (i.e. to another window or server)
  };
    change_type change;

  i4_display_change_event_class(i4_display_class *display, change_type change) 
    : display(display), change(change) {}

  virtual dispatch_time when()  { return NOW; }  
  virtual event_type type()     { return DISPLAY_CHANGE; }
  virtual i4_event  *copy()     { return new i4_display_change_event_class(display,change); }  
  char *name() { return "display_change"; }
};

class i4_display_close_event_class      : public i4_event
{
public:
  i4_display_class *display;

  i4_display_close_event_class(i4_display_class *display) : display(display) {}
  virtual dispatch_time when()  { return LATER; }  
  virtual event_type type()     { return DISPLAY_CLOSE; }
  virtual i4_event  *copy()     { return new i4_display_close_event_class(display); }
  char *name() { return "display_close"; }
};

class i4_user_message_event_class       : public i4_event
{
public:
  w32 sub_type;

  virtual event_type type() { return USER_MESSAGE; }
  i4_user_message_event_class(w32 sub_type) : sub_type(sub_type) {}
  virtual i4_event  *copy() { return new i4_user_message_event_class(sub_type); }  
  char *name() { return "user_message"; }
} ;

class i4_query_message_event_class      : public i4_event
{
public:
  virtual event_type type() { return QUERY_MESSAGE; }
  virtual i4_event  *copy() = 0;
  virtual dispatch_time when()  { return NOW; }  
  char *name() { return "query_message"; }
} ;

class i4_object_message_event_class     : public i4_event
{
public:
  dispatch_time dtime;
  void *object;
  w32 sub_type;

  virtual dispatch_time when() { return dtime; }  
  virtual event_type type() { return OBJECT_MESSAGE; }
  i4_object_message_event_class(void *object, w32 sub_type=0, dispatch_time when=ANYTIME)
    : object(object), sub_type(sub_type), dtime(when) {}
  virtual i4_event  *copy() { return new i4_object_message_event_class(object, sub_type); }
  char *name() { return "object_message"; }
} ;

class i4_system_signal_event_class      : public i4_event
{
public:
  enum signal_type 
  {
    HUP,   INTERRUPT,   QUIT,      ILL,    TRAP,    ABORT,    IOT,    BUS,    FPE,
    KILL,  USR1,        SEG_FAULT, USR2,   PIPE,    ALARM,    TERM,   CHILD,  CONTINUE,
    STOP,  TSTP,        TTIN,      TTOU,   IO,      URG,      CPU,    XFSZ,   VTALRM,
    PROF,  WINCH
  };
  signal_type signal_number;
  
  virtual event_type type() { return SYSTEM_SIGNAL; }
  virtual i4_event  *copy() { return new i4_system_signal_event_class(signal_number); }

  i4_system_signal_event_class(signal_type sig) : signal_number(sig) {}
  char *name() { return "signal"; }
} ;



class i4_user_idle_event_class        : public i4_event
{
public:
  virtual event_type type() { return IDLE_MESSAGE; }
  virtual i4_event  *copy() { return new i4_user_idle_event_class; }
  char *name() { return "idle_message"; }
} ;

#endif