/*
   Copyright (C) 1999-2006 Id Software, Inc. and contributors.
   For a list of contributors, see the accompanying CONTRIBUTORS file.

   This file is part of GtkRadiant.

   GtkRadiant 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.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

// q_shared.c -- stateless support routines that are included in each code dll
#include "q_shared.h"

/*
   ============================================================================

   GROWLISTS

   ============================================================================
 */

// malloc / free all in one place for debugging
extern "C" void *Com_Allocate( int bytes );
extern "C" void Com_Dealloc( void *ptr );

void Com_InitGrowList( growList_t *list, int maxElements ) {
	list->maxElements = maxElements;
	list->currentElements = 0;
	list->elements = (void **)Com_Allocate( list->maxElements * sizeof( void * ) );
}

int Com_AddToGrowList( growList_t *list, void *data ) {
	void    **old;

	if ( list->currentElements != list->maxElements ) {
		list->elements[list->currentElements] = data;
		return list->currentElements++;
	}

	// grow, reallocate and move
	old = list->elements;

	if ( list->maxElements < 0 ) {
		Com_Error( ERR_FATAL, "Com_AddToGrowList: maxElements = %i", list->maxElements );
	}

	if ( list->maxElements == 0 ) {
		// initialize the list to hold 100 elements
		Com_InitGrowList( list, 100 );
		return Com_AddToGrowList( list, data );
	}

	list->maxElements *= 2;

	Com_DPrintf( "Resizing growlist to %i maxElements\n", list->maxElements );

	list->elements = (void **)Com_Allocate( list->maxElements * sizeof( void * ) );

	if ( !list->elements ) {
		Com_Error( ERR_DROP, "Growlist alloc failed" );
	}

	memcpy( list->elements, old, list->currentElements * sizeof( void * ) );

	Com_Dealloc( old );

	return Com_AddToGrowList( list, data );
}

void *Com_GrowListElement( const growList_t *list, int index ) {
	if ( index < 0 || index >= list->currentElements ) {
		Com_Error( ERR_DROP, "Com_GrowListElement: %i out of range of %i",
		           index, list->currentElements );
	}
	return list->elements[index];
}

int Com_IndexForGrowListElement( const growList_t *list, const void *element ) {
	int i;

	for ( i = 0; i < list->currentElements; i++ ) {
		if ( list->elements[i] == element ) {
			return i;
		}
	}
	return -1;
}

//============================================================================


float Com_Clamp( float min, float max, float value ) {
	if ( value < min ) {
		return min;
	}
	if ( value > max ) {
		return max;
	}
	return value;
}

/*
   ============
   Com_StringContains
   ============
 */
const char *Com_StringContains( const char *str1, const char *str2, int casesensitive ) {
	int len, i, j;

	len = strlen( str1 ) - strlen( str2 );
	for ( i = 0; i <= len; i++, str1++ ) {
		for ( j = 0; str2[j]; j++ ) {
			if ( casesensitive ) {
				if ( str1[j] != str2[j] ) {
					break;
				}
			}
			else {
				if ( toupper( str1[j] ) != toupper( str2[j] ) ) {
					break;
				}
			}
		}
		if ( !str2[j] ) {
			return str1;
		}
	}
	return NULL;
}

/*
   ============
   Com_Filter
   ============
 */
int Com_Filter( const char *filter, const char *name, int casesensitive ){
	char buf[MAX_TOKEN_CHARS];
	const char *ptr;
	int i, found;

	while ( *filter ) {
		if ( *filter == '*' ) {
			filter++;
			for ( i = 0; *filter; i++ ) {
				if ( *filter == '*' || *filter == '?' ) {
					break;
				}
				buf[i] = *filter;
				filter++;
			}
			buf[i] = '\0';
			if ( strlen( buf ) ) {
				ptr = Com_StringContains( name, buf, casesensitive );
				if ( !ptr ) {
					return qfalse;
				}
				name = ptr + strlen( buf );
			}
		}
		else if ( *filter == '?' ) {
			filter++;
			name++;
		}
		else if ( *filter == '[' && *( filter + 1 ) == '[' ) {
			filter++;
		}
		else if ( *filter == '[' ) {
			filter++;
			found = qfalse;
			while ( *filter && !found ) {
				if ( *filter == ']' && *( filter + 1 ) != ']' ) {
					break;
				}
				if ( *( filter + 1 ) == '-' && *( filter + 2 ) && ( *( filter + 2 ) != ']' || *( filter + 3 ) == ']' ) ) {
					if ( casesensitive ) {
						if ( *name >= *filter && *name <= *( filter + 2 ) ) {
							found = qtrue;
						}
					}
					else {
						if ( toupper( *name ) >= toupper( *filter ) &&
						     toupper( *name ) <= toupper( *( filter + 2 ) ) ) {
							found = qtrue;
						}
					}
					filter += 3;
				}
				else {
					if ( casesensitive ) {
						if ( *filter == *name ) {
							found = qtrue;
						}
					}
					else {
						if ( toupper( *filter ) == toupper( *name ) ) {
							found = qtrue;
						}
					}
					filter++;
				}
			}
			if ( !found ) {
				return qfalse;
			}
			while ( *filter ) {
				if ( *filter == ']' && *( filter + 1 ) != ']' ) {
					break;
				}
				filter++;
			}
			filter++;
			name++;
		}
		else {
			if ( casesensitive ) {
				if ( *filter != *name ) {
					return qfalse;
				}
			}
			else {
				if ( toupper( *filter ) != toupper( *name ) ) {
					return qfalse;
				}
			}
			filter++;
			name++;
		}
	}
	return qtrue;
}


/*
   ================
   Com_HashString

   ================
 */
int Com_HashString( const char *fname ) {
	int i;
	long hash;
	char letter;

	hash = 0;
	i = 0;
	while ( fname[i] != '\0' ) {
		letter = tolower( fname[i] );
		if ( letter == '.' ) {
			break;                              // don't include extension
		}
		if ( letter == '\\' ) {
			letter = '/';                       // damn path names
		}
		hash += (long)( letter ) * ( i + 119 );
		i++;
	}
	hash &= ( FILE_HASH_SIZE - 1 );
	return hash;
}


/*
   ============
   Com_SkipPath
   ============
 */
char *Com_SkipPath( char *pathname ){
	char    *last;

	last = pathname;
	while ( *pathname )
	{
		if ( *pathname == '/' ) {
			last = pathname + 1;
		}
		pathname++;
	}
	return last;
}

/*
   ============
   Com_StripExtension
   ============
 */
void Com_StripExtension( const char *in, char *out ) {
	while ( *in && *in != '.' ) {
		*out++ = *in++;
	}
	*out = 0;
}


/*
   ==================
   Com_DefaultExtension
   ==================
 */
void Com_DefaultExtension( char *path, int maxSize, const char *extension ) {
	char oldPath[MAX_QPATH];
	char    *src;

//
// if path doesn't have a .EXT, append extension
// (extension should include the .)
//
	src = path + strlen( path ) - 1;

	while ( *src != '/' && src != path ) {
		if ( *src == '.' ) {
			return;                 // it has an extension
		}
		src--;
	}

	Q_strncpyz( oldPath, path, sizeof( oldPath ) );
	Com_sprintf( path, maxSize, "%s%s", oldPath, extension );
}

/*
   ============================================================================

                    BYTE ORDER FUNCTIONS

   ============================================================================
 */

// can't just use function pointers, or dll linkage can
// mess up when qcommon is included in multiple places
static short ( *_BigShort )( short l );
static short ( *_LittleShort )( short l );
static int ( *_BigLong )( int l );
static int ( *_LittleLong )( int l );
static float ( *_BigFloat )( float l );
static float ( *_LittleFloat )( float l );

short   BigShort( short l ){
	return _BigShort( l );
}
short   LittleShort( short l ) {
	return _LittleShort( l );
}
int     BigLong( int l ) {
	return _BigLong( l );
}
int     LittleLong( int l ) {
	return _LittleLong( l );
}
float   BigFloat( float l ) {
	return _BigFloat( l );
}
float   LittleFloat( float l ) {
	return _LittleFloat( l );
}

short   ShortSwap( short l ){
	byte b1,b2;

	b1 = l & 255;
	b2 = ( l >> 8 ) & 255;

	return ( b1 << 8 ) + b2;
}

short   ShortNoSwap( short l ){
	return l;
}

int    LongSwap( int l ){
	byte b1,b2,b3,b4;

	b1 = l & 255;
	b2 = ( l >> 8 ) & 255;
	b3 = ( l >> 16 ) & 255;
	b4 = ( l >> 24 ) & 255;

	return ( (int)b1 << 24 ) + ( (int)b2 << 16 ) + ( (int)b3 << 8 ) + b4;
}

int LongNoSwap( int l ){
	return l;
}

float FloatSwap( float f ){
	union
	{
		float f;
		byte b[4];
	} dat1, dat2;


	dat1.f = f;
	dat2.b[0] = dat1.b[3];
	dat2.b[1] = dat1.b[2];
	dat2.b[2] = dat1.b[1];
	dat2.b[3] = dat1.b[0];
	return dat2.f;
}

float FloatNoSwap( float f ){
	return f;
}

/*
   ================
   Swap_Init
   ================
 */
void Swap_Init( void ){
	byte swaptest[2] = {1,0};

// set the byte swapping variables in a portable manner
	if ( *(short *)swaptest == 1 ) {
		_BigShort = ShortSwap;
		_LittleShort = ShortNoSwap;
		_BigLong = LongSwap;
		_LittleLong = LongNoSwap;
		_BigFloat = FloatSwap;
		_LittleFloat = FloatNoSwap;
	}
	else
	{
		_BigShort = ShortNoSwap;
		_LittleShort = ShortSwap;
		_BigLong = LongNoSwap;
		_LittleLong = LongSwap;
		_BigFloat = FloatNoSwap;
		_LittleFloat = FloatSwap;
	}

}

/*
   ===============
   Com_ParseInfos
   ===============
 */
int Com_ParseInfos( const char *buf, int max, char infos[][MAX_INFO_STRING] ) {
	const char  *token;
	int count;
	char key[MAX_TOKEN_CHARS];

	count = 0;

	while ( 1 ) {
		token = Com_Parse( &buf );
		if ( !token[0] ) {
			break;
		}
		if ( strcmp( token, "{" ) ) {
			Com_Printf( "Missing { in info file\n" );
			break;
		}

		if ( count == max ) {
			Com_Printf( "Max infos exceeded\n" );
			break;
		}

		infos[count][0] = 0;
		while ( 1 ) {
			token = Com_Parse( &buf );
			if ( !token[0] ) {
				Com_Printf( "Unexpected end of info file\n" );
				break;
			}
			if ( !strcmp( token, "}" ) ) {
				break;
			}
			Q_strncpyz( key, token, sizeof( key ) );

			token = Com_ParseOnLine( &buf );
			if ( !token[0] ) {
				token = "<NULL>";
			}
			Info_SetValueForKey( infos[count], key, token );
		}
		count++;
	}

	return count;
}



/*
   ============================================================================

                    LIBRARY REPLACEMENT FUNCTIONS

   ============================================================================
 */

int Q_isprint( int c ){
	if ( c >= 0x20 && c <= 0x7E ) {
		return ( 1 );
	}
	return ( 0 );
}

int Q_islower( int c ){
	if ( c >= 'a' && c <= 'z' ) {
		return ( 1 );
	}
	return ( 0 );
}

int Q_isupper( int c ){
	if ( c >= 'A' && c <= 'Z' ) {
		return ( 1 );
	}
	return ( 0 );
}

int Q_isalpha( int c ){
	if ( ( c >= 'a' && c <= 'z' ) || ( c >= 'A' && c <= 'Z' ) ) {
		return ( 1 );
	}
	return ( 0 );
}

char* Q_strrchr( const char* string, int c ){
	char cc = c;
	char *s;
	char *sp = (char *)0;

	s = (char*)string;

	while ( *s )
	{
		if ( *s == cc ) {
			sp = s;
		}
		s++;
	}
	if ( cc == 0 ) {
		sp = s;
	}

	return sp;
}

/*
   =============
   Q_strncpyz

   Safe strncpy that ensures a trailing zero
   =============
 */
void Q_strncpyz( char *dest, const char *src, std::size_t destsize ) {
	if ( !src ) {
		Com_Error( ERR_FATAL, "Q_strncpyz: NULL src" );
	}
	if ( destsize < 1 ) {
		Com_Error( ERR_FATAL,"Q_strncpyz: destsize < 1" );
	}

	strncpy( dest, src, destsize - 1 );
	dest[destsize - 1] = 0;
}

int Q_stricmpn( const char *s1, const char *s2, int n ) {
	int c1, c2;

	do {
		c1 = *s1++;
		c2 = *s2++;

		if ( !n-- ) {
			return 0;       // strings are equal until end point
		}

		if ( c1 != c2 ) {
			if ( c1 >= 'a' && c1 <= 'z' ) {
				c1 -= ( 'a' - 'A' );
			}
			if ( c2 >= 'a' && c2 <= 'z' ) {
				c2 -= ( 'a' - 'A' );
			}
			if ( c1 != c2 ) {
				return c1 < c2 ? -1 : 1;
			}
		}
	} while ( c1 );

	return 0;       // strings are equal
}

int Q_strncmp( const char *s1, const char *s2, int n ) {
	int c1, c2;

	do {
		c1 = *s1++;
		c2 = *s2++;

		if ( !n-- ) {
			return 0;       // strings are equal until end point
		}

		if ( c1 != c2 ) {
			return c1 < c2 ? -1 : 1;
		}
	} while ( c1 );

	return 0;       // strings are equal
}

int Q_stricmp( const char *s1, const char *s2 ) {
	return Q_stricmpn( s1, s2, 99999 );
}


char *Q_strlwr( char *s1 ) {
	char    *s;

	s = s1;
	while ( *s ) {
		*s = tolower( *s );
		s++;
	}
	return s1;
}

char *Q_strupr( char *s1 ) {
	char    *s;

	s = s1;
	while ( *s ) {
		*s = toupper( *s );
		s++;
	}
	return s1;
}


// never goes past bounds or leaves without a terminating 0
void Q_strcat( char *dest, std::size_t size, const char *src ) {
	auto l1 = strlen( dest );
	if ( l1 >= size ) {
		Com_Error( ERR_FATAL, "Q_strcat: already overflowed" );
	}
	Q_strncpyz( dest + l1, src, size - l1 );
}


int Q_PrintStrlen( const char *string ) {
	int len;
	const char  *p;

	if ( !string ) {
		return 0;
	}

	len = 0;
	p = string;
	while ( *p ) {
		if ( Q_IsColorString( p ) ) {
			p += 2;
			continue;
		}
		p++;
		len++;
	}

	return len;
}


char *Q_CleanStr( char *string ) {
	char*   d;
	char*   s;
	int c;

	s = string;
	d = string;
	while ( ( c = *s ) != 0 ) {
		if ( Q_IsColorString( s ) ) {
			s++;
		}
		else if ( c >= 0x20 && c <= 0x7E ) {
			*d++ = c;
		}
		s++;
	}
	*d = '\0';

	return string;
}


void QDECL Com_sprintf( char *dest, std::size_t size, const char *fmt, ... ) {
	va_list argptr;
	char bigbuffer[32000];      // big, but small enough to fit in PPC stack

	va_start( argptr,fmt );
	int ret = vsprintf( bigbuffer,fmt,argptr );
	va_end( argptr );
	if ( ret < 0 ) {
		Com_Error(ERR_FATAL, "Com_sprintf: vsprintf failed");
	}
	auto len = static_cast<size_t>(ret);
	if ( len >= sizeof( bigbuffer ) ) {
		Com_Error( ERR_FATAL, "Com_sprintf: overflowed bigbuffer" );
	}
	if ( len >= size ) {
		Com_Printf( "Com_sprintf: overflow of %i in %i\n", len, size );
	}
	Q_strncpyz( dest, bigbuffer, size );
}


/*
   ============
   va

   does a varargs printf into a temp buffer, so I don't need to have
   varargs versions of all text functions.
   FIXME: make this buffer size safe someday
   ============
 */
char *QDECL va( const char *format, ... ) {
	va_list argptr;
	static char string[2][32000];       // in case va is called by nested functions
	static int index = 0;
	char    *buf;

	buf = string[index & 1];
	index++;

	va_start( argptr, format );
	vsprintf( buf, format,argptr );
	va_end( argptr );

	return buf;
}


/*
   =====================================================================

   INFO STRINGS

   =====================================================================
 */

/*
   ===============
   Info_ValueForKey

   Searches the string for the given
   key and returns the associated value, or an empty string.
   FIXME: overflow check?
   ===============
 */
const char *Info_ValueForKey( const char *s, const char *key ) {
	char pkey[MAX_INFO_KEY];
	static char value[2][MAX_INFO_VALUE];   // use two buffers so compares
	                                        // work without stomping on each other
	static int valueindex = 0;
	char    *o;

	if ( !s || !key ) {
		return "";
	}

	if ( strlen( s ) >= MAX_INFO_STRING ) {
		Com_Error( ERR_DROP, "Info_ValueForKey: oversize infostring" );
	}

	valueindex ^= 1;
	if ( *s == '\\' ) {
		s++;
	}
	while ( 1 )
	{
		o = pkey;
		while ( *s != '\\' )
		{
			if ( !*s ) {
				return "";
			}
			*o++ = *s++;
		}
		*o = 0;
		s++;

		o = value[valueindex];

		while ( *s != '\\' && *s )
		{
			*o++ = *s++;
		}
		*o = 0;

		if ( !Q_stricmp( key, pkey ) ) {
			return value[valueindex];
		}

		if ( !*s ) {
			break;
		}
		s++;
	}

	return "";
}


/*
   ===================
   Info_NextPair

   Used to itterate through all the key/value pairs in an info string
   ===================
 */
void Info_NextPair( const char *( *head ), char key[MAX_INFO_KEY], char value[MAX_INFO_VALUE] ) {
	char    *o;
	const char  *s;

	s = *head;

	if ( *s == '\\' ) {
		s++;
	}
	key[0] = 0;
	value[0] = 0;

	o = key;
	while ( *s != '\\' ) {
		if ( !*s ) {
			*o = 0;
			*head = s;
			return;
		}
		*o++ = *s++;
	}
	*o = 0;
	s++;

	o = value;
	while ( *s != '\\' && *s ) {
		*o++ = *s++;
	}
	*o = 0;

	*head = s;
}


/*
   ===================
   Info_RemoveKey
   ===================
 */
void Info_RemoveKey( char *s, const char *key ) {
	char    *start;
	char pkey[MAX_INFO_KEY];
	char value[MAX_INFO_VALUE];
	char    *o;

	if ( strlen( s ) >= MAX_INFO_STRING ) {
		Com_Error( ERR_DROP, "Info_RemoveKey: oversize infostring" );
	}

	if ( strchr( key, '\\' ) ) {
		return;
	}

	while ( 1 )
	{
		start = s;
		if ( *s == '\\' ) {
			s++;
		}
		o = pkey;
		while ( *s != '\\' )
		{
			if ( !*s ) {
				return;
			}
			*o++ = *s++;
		}
		*o = 0;
		s++;

		o = value;
		while ( *s != '\\' && *s )
		{
			if ( !*s ) {
				return;
			}
			*o++ = *s++;
		}
		*o = 0;

		if ( !strcmp( key, pkey ) ) {
			strcpy( start, s );  // remove this part
			return;
		}

		if ( !*s ) {
			return;
		}
	}

}


/*
   ==================
   Info_Validate

   Some characters are illegal in info strings because they
   can mess up the server's parsing
   ==================
 */
qboolean Info_Validate( const char *s ) {
	if ( strchr( s, '\"' ) ) {
		return qfalse;
	}
	if ( strchr( s, ';' ) ) {
		return qfalse;
	}
	return qtrue;
}

/*
   ==================
   Info_SetValueForKey

   Changes or adds a key/value pair
   ==================
 */
void Info_SetValueForKey( char *s, const char *key, const char *value ) {
	char newi[MAX_INFO_STRING];

	if ( strlen( s ) >= MAX_INFO_STRING ) {
		Com_Error( ERR_DROP, "Info_SetValueForKey: oversize infostring" );
	}

	if ( strchr( key, '\\' ) || strchr( value, '\\' ) ) {
		Com_Printf( "Can't use keys or values with a \\\n" );
		return;
	}

	if ( strchr( key, ';' ) || strchr( value, ';' ) ) {
		Com_Printf( "Can't use keys or values with a semicolon\n" );
		return;
	}

	if ( strchr( key, '\"' ) || strchr( value, '\"' ) ) {
		Com_Printf( "Can't use keys or values with a \"\n" );
		return;
	}

	Info_RemoveKey( s, key );
	if ( !value || !strlen( value ) ) {
		return;
	}

	Com_sprintf( newi, sizeof( newi ), "\\%s\\%s", key, value );

	if ( strlen( newi ) + strlen( s ) > MAX_INFO_STRING ) {
		Com_Printf( "Info string length exceeded\n" );
		return;
	}

	strcat( s, newi );
}

//====================================================================


/*
   ===============
   ParseHex
   ===============
 */
int ParseHex( const char *text ) {
	int value;
	int c;

	value = 0;
	while ( ( c = *text++ ) != 0 ) {
		if ( c >= '0' && c <= '9' ) {
			value = value * 16 + c - '0';
			continue;
		}
		if ( c >= 'a' && c <= 'f' ) {
			value = value * 16 + 10 + c - 'a';
			continue;
		}
		if ( c >= 'A' && c <= 'F' ) {
			value = value * 16 + 10 + c - 'A';
			continue;
		}
	}

	return value;
}