// options.hxx -- class to handle command line options
//
// Written by Curtis Olson, started April 1998.
//
// Copyright (C) 1998  Curtis L. Olson  - curt@me.umn.edu
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$


#ifndef _OPTIONS_HXX
#define _OPTIONS_HXX


#ifndef __cplusplus
# error This library requires C++
#endif                                   

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <Include/compiler.h>

#ifdef HAVE_WINDOWS_H
#  include <windows.h>
#endif

#include <GL/glut.h>
#include <XGL/xgl.h>

#if defined(FX) && defined(XMESA)
extern bool global_fullscreen;
#endif

#include STL_STRING
#include <vector>

FG_USING_STD(vector);
FG_USING_STD(string);

typedef vector < string > str_container;
typedef str_container::iterator str_iterator;
typedef str_container::const_iterator const_str_iterator;


class fgOPTIONS {

public:

    enum
    {
	FG_OPTIONS_OK = 0,
	FG_OPTIONS_HELP = 1,
	FG_OPTIONS_ERROR = 2
    };

    enum
    {
	FG_UNITS_FEET = 0,
	FG_UNITS_METERS = 1
    };

    enum fgFogKind
    {
	FG_FOG_DISABLED = 0,
	FG_FOG_FASTEST  = 1,
	FG_FOG_NICEST   = 2
    };

    enum
    {
	FG_RADIUS_MIN = 1,
	FG_RADIUS_MAX = 4
    };

private:

    // The flight gear "root" directory
    string fg_root;

    // Starting position and orientation
    string airport_id;  // ID of initial starting airport
    double lon;         // starting longitude in degrees (west = -)
    double lat;         // starting latitude in degrees (south = -)
    double altitude;    // starting altitude in meters
    double heading;     // heading (yaw) angle in degress (Psi)
    double roll;        // roll angle in degrees (Phi)
    double pitch;       // pitch angle in degrees (Theta)

    // Miscellaneous
    bool game_mode;     // Game mode enabled/disabled
    bool splash_screen; // show splash screen
    bool intro_music;   // play introductory music
    int mouse_pointer;  // show mouse pointer
    bool pause;         // pause intially enabled/disabled

    // Features
    bool hud_status;    // HUD on/off
    bool panel_status;  // Panel on/off
    bool sound;         // play sound effects

    // Flight Model options
    int flight_model;   // Flight Model:  FG_SLEW, FG_LARCSIM, etc.

    // Rendering options
    fgFogKind fog;      // Fog nicest/fastest/disabled
    double fov;         // Field of View
    bool fullscreen;    // Full screen mode enabled/disabled
    int shading;        // shading method, 0 = Flat, 1 = Smooth
    bool skyblend;      // Blend sky to haze (using polygons) or just clear
    bool textures;      // Textures enabled/disabled
    bool wireframe;     // Wireframe mode enabled/disabled
    int xsize, ysize;   // window size derived from geometry string

    // Scenery options
    int tile_radius;   // Square radius of rendered tiles (around center 
                       // square.)
    int tile_diameter; // Diameter of rendered tiles.  for instance
                       // if tile_diameter = 3 then a 3 x 3 grid of tiles will 
                       // be drawn.  Increase this to see terrain that is 
                       // further away.

    // HUD options
    int units;         // feet or meters
    int tris_or_culled;

    // Time options
    int time_offset;   // Offset true time by this many seconds
    long int start_gst;     // Specify a greenwich sidereal time (gst)
    long int start_lst;     // Specify a local sidereal time (lst)

    // Serial Ports, we currently support up to four channels
    // fgSerialPortKind port_a_kind;  // Port a kind
    // fgSerialPortKind port_b_kind;  // Port b kind
    // fgSerialPortKind port_c_kind;  // Port c kind
    // fgSerialPortKind port_d_kind;  // Port d kind

    // Serial port configuration strings
    str_container port_options_list;
    
public:

    fgOPTIONS();
    ~fgOPTIONS();

    // Parse a single option
    int parse_option( const string& arg );

    // Parse the command line options
    int parse_command_line( int argc, char **argv );

    // Parse the command line options
    int parse_config_file( const string& path );

    // Print usage message
    void usage ( void );

    // Query functions
    inline string get_fg_root() const { return fg_root; }
    inline string get_airport_id() const { return airport_id; }
    inline double get_lon() const { return lon; }
    inline double get_lat() const { return lat; }
    inline double get_altitude() const { return altitude; }
    inline double get_heading() const { return heading; }
    inline double get_roll() const { return roll; }
    inline double get_pitch() const { return pitch; }
    inline bool get_game_mode() const { return game_mode; }
    inline bool get_splash_screen() const { return splash_screen; }
    inline bool get_intro_music() const { return intro_music; }
    inline int get_mouse_pointer() const { return mouse_pointer; }
    inline bool get_pause() const { return pause; }
    inline bool get_hud_status() const { return hud_status; }
    inline bool get_panel_status() const { return panel_status; }
    inline bool get_sound() const { return sound; }
    inline int get_flight_model() const { return flight_model; }
    inline bool fog_enabled() const { return fog != FG_FOG_DISABLED; }
    inline fgFogKind get_fog() const { return fog; }
    inline double get_fov() const { return fov; }
    inline bool get_fullscreen() const { return fullscreen; }
    inline int get_shading() const { return shading; }
    inline bool get_skyblend() const { return skyblend; }
    inline bool get_textures() const { return textures; }
    inline bool get_wireframe() const { return wireframe; }
    inline int get_xsize() const { return xsize; }
    inline int get_ysize() const { return ysize; }
    inline int get_tile_radius() const { return tile_radius; }
    inline int get_tile_diameter() const { return tile_diameter; }

    inline int get_units() const { return units; }
    inline int get_tris_or_culled() const { return tris_or_culled; }

    inline int get_time_offset() const { return time_offset; }
    inline long int get_start_gst() const { return start_gst; };
    inline long int get_start_lst() const { return start_lst; }

    inline str_container get_port_options_list() const { 
	return port_options_list;
    }

    // Update functions
    inline void set_hud_status( bool status ) { hud_status = status; }
    inline void set_fov( double amount ) { fov = amount; }
    inline void set_textures( bool status ) { textures = status; }
    inline void cycle_fog( void ) { 
	if ( fog == FG_FOG_DISABLED ) {
	    fog = FG_FOG_FASTEST;
	} else if ( fog == FG_FOG_FASTEST ) {
	    fog = FG_FOG_NICEST;
	    xglHint ( GL_FOG_HINT, GL_NICEST );
	} else if ( fog == FG_FOG_NICEST ) {
	    fog = FG_FOG_DISABLED;
	    xglHint ( GL_FOG_HINT, GL_FASTEST );
	}
    }
    inline void set_xsize( int x ) { xsize= x; }
    inline void set_ysize( int y ) { xsize= y; }

private:

    double parse_time( const string& time_str );
    long int parse_date( const string& date_str );
    double parse_degree( const string& degree_str );
    int parse_time_offset( const string& time_str );
    int parse_tile_radius( const string& arg );
    int parse_fdm( const string& fm );
    double parse_fov( const string& arg );
    bool parse_serial( const string& serial_str );
};


extern fgOPTIONS current_options;


#endif /* _OPTIONS_HXX */