/*
nanoquake.h -- common quake engine defintions as single-header library
Copyright (C) 1997 id Software
Copyright (C) 2024 Uncle Mike, Alibek Omarov

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 3 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.
*/
#ifndef NANOQUAKE_H
#define NANOQUAKE_H

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <time.h>

#ifdef NANOQUAKE_IMPL
#define EXTERN
#else // NANOQUAKE_IMPL
#define EXTERN extern
#endif

#define Assert assert

//
// mathlib
//
#define Q_min( x, y ) (( x ) < ( y ) ? ( x ) : ( y ))
#define Q_max( x, y ) (( x ) > ( y ) ? ( x ) : ( y ))
#define bound( min, val, max ) Q_min( Q_max( min, val ), max )
#define SetBits( x, y )   ((x) |=  (y))
#define ClearBits( x, y ) ((x) &= ~(y))
#define FBitSet( x, y )   ((x) & (y))
#define ARRAYSIZE( array ) ( sizeof( array ) / sizeof( array[0] ))

//
// common
//
#ifndef __cplusplus
typedef enum { false, true }	qboolean;
#else
typedef int qboolean;
#endif
typedef unsigned char byte;
typedef off_t fs_offset_t;
#define Z_Free free
#define Z_Calloc( x ) calloc( 1, x )
#define Mem_Malloc( x, y ) malloc( y )
#define Con_Printf printf
#define Con_DPrintf printf
#define Con_Reportf printf
#define Q_atof atof
#define Q_atoi atoi
#define COM_RandomLong( min, max ) ( min + rand() % ( max - min ))
#define Q_strncmp strncmp
#define S_NOTE			"Note: "
#define S_WARN			"Warning: "
#define S_ERROR			"Error: "

//
// cvars
//

typedef struct cvar_s
{
	const char *name;
	char *string;
	int flags;
	float value;
	struct cvar_s *next;
} cvar_t;

#define CVAR_SENTINEL 0xdeadbeef

#define CVAR_DEFINE( cv, cvname, cvstr, cvflags, cvdesc ) \
	cvar_t cv = { (char*)cvname, (char*)cvstr, cvflags, 0.0f, (void *)CVAR_SENTINEL }

#define CVAR_DEFINE_AUTO( cv, cvstr, cvflags, cvdesc ) \
	CVAR_DEFINE( cv, #cv, cvstr, cvflags, cvdesc )

#define FCVAR_ARCHIVE (1 << 0)
#define FCVAR_CHANGED (1 << 13)

static inline void Cvar_DirectSet( cvar_t *cv, const char *value )
{
	free( cv->string );
	cv->string = strdup( value );
	cv->value = atoi( cv->string );
	cv->flags |= FCVAR_CHANGED;
}

static inline void Cvar_DirectSetValue( cvar_t *cv, float value )
{
	char str[32];

	snprintf( str, sizeof( str ), "%f", value );

	free( cv->string );
	cv->string = strdup( str );
	cv->value = value;
	cv->flags |= FCVAR_CHANGED;
}

static inline void Cvar_RegisterVariable( cvar_t *cv )
{
	cv->string = strdup( cv->string );
	cv->value = atoi( cv->string );
}

//
// cmds
//
#define Cmd_Argc() cmd_argc
#define Cmd_Argv( i ) cmd_argv[i]

EXTERN int cmd_argc;
EXTERN char **cmd_argv;

static inline void Cmd_ExecCommand( void (*func)(), int argc, char **argv )
{
	cmd_argc = argc;
	cmd_argv = argv;
	func();
}

static inline void Cmd_AddCommand( const char *cmd, void *func, const char *desc )
{
}
static inline void Cmd_RemoveCommand( const char *cmd )
{
}

//
// time
//
static inline double Sys_DoubleTime( void )
{
	struct timespec ts;
#if __irix__
	clock_gettime( CLOCK_SGI_CYCLE, &ts );
#else
	clock_gettime( CLOCK_MONOTONIC, &ts );
#endif
	return (double) ts.tv_sec + (double) ts.tv_nsec/1000000000.0;
}

//
// sound
//
#define SOUND_11k (11025)
#define CLIP( x )			(( x ) > 32760 ? 32760 : (( x ) < -32760 ? -32760 : ( x )))

typedef struct
{
	int			left;
	int			right;
} portable_samplepair_t;

typedef struct
{
	int waterlevel;
} listener_t;

typedef enum
{
	WF_UNKNOWN = 0,
	WF_PCMDATA,
	WF_MPGDATA,
	WF_TOTALCOUNT,	// must be last
} sndformat_t;

typedef struct sndlib_s
{
	// current sound state
	int		type;		// sound type
	int		rate;		// num samples per second (e.g. 11025 - 11 khz)
	int		width;		// resolution - bum bits divided by 8 (8 bit is 1, 16 bit is 2)
	int		channels;		// num channels (1 - mono, 2 - stereo)
	int		loopstart;	// start looping from
	uint		samples;		// total samplecount in sound
	uint		flags;		// additional sound flags
	size_t		size;		// sound unpacked size (for bounds checking)
	byte		*wav;		// sound pointer (see sound_type for details)

	byte		*tempbuffer;	// for convert operations
	int		cmd_flags;
} sndlib_t;

EXTERN sndlib_t sound;
EXTERN listener_t s_listener;

qboolean Sound_LoadWAV( const char *name, const byte *buffer, fs_offset_t filesize );

#endif // NANOQUAKE_H