/* -------------------------------------------------------------------------------

   Copyright (C) 1999-2007 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

   -------------------------------------------------------------------------------

   This code has been altered significantly from its original form, to support
   several games based on the Quake III Arena engine, in the form of "Q3Map2."

   ------------------------------------------------------------------------------- */



/* dependencies */
#include "vmap.h"



/*
   AnalyzeBSPMain() - ydnar
   analyzes a Quake engine BSP file
 */

typedef struct abspHeader_s
{
	char ident[ 4 ];
	int version;

	bspLump_t lumps[ 1 ];       /* unknown size */
}
abspHeader_t;

typedef struct abspLumpTest_s
{
	int radix, minCount;
	char            *name;
}
abspLumpTest_t;

int AnalyzeBSPMain( int argc, char **argv ){
	abspHeader_t            *header;
	int size, i, version, offset, length, lumpInt, count;
	char ident[ 5 ];
	void                    *lump;
	float lumpFloat;
	char lumpString[ 1024 ], source[ 1024 ];
	qboolean lumpSwap = qfalse;
	abspLumpTest_t          *lumpTest;
	static abspLumpTest_t lumpTests[] =
	{
		{ sizeof( bspPlane_t ),         6,      "IBSP LUMP_PLANES" },
		{ sizeof( bspBrush_t ),         1,      "IBSP LUMP_BRUSHES" },
		{ 8,                            6,      "IBSP LUMP_BRUSHSIDES" },
		{ sizeof( bspBrushSide_t ),     6,      "RBSP LUMP_BRUSHSIDES" },
		{ sizeof( bspModel_t ),         1,      "IBSP LUMP_MODELS" },
		{ sizeof( bspNode_t ),          2,      "IBSP LUMP_NODES" },
		{ sizeof( bspLeaf_t ),          1,      "IBSP LUMP_LEAFS" },
		{ 104,                          3,      "IBSP LUMP_DRAWSURFS" },
		{ 44,                           3,      "IBSP LUMP_DRAWVERTS" },
		{ 4,                            6,      "IBSP LUMP_DRAWINDEXES" },
		{ 128 * 128 * 3,                1,      "IBSP LUMP_LIGHTMAPS" },
		{ 256 * 256 * 3,                1,      "IBSP LUMP_LIGHTMAPS (256 x 256)" },
		{ 512 * 512 * 3,                1,      "IBSP LUMP_LIGHTMAPS (512 x 512)" },
		{ 0, 0, NULL }
	};


	/* arg checking */
	if ( argc < 1 ) {
		Sys_Printf( "Usage: q3map -analyze [-lumpswap] [-v] <mapname>\n" );
		return 0;
	}

	/* process arguments */
	for ( i = 1; i < ( argc - 1 ); i++ )
	{
		/* -format map|ase|... */
		if ( !strcmp( argv[ i ],  "-lumpswap" ) ) {
			Sys_Printf( "Swapped lump structs enabled\n" );
			lumpSwap = qtrue;
		}
	}

	/* clean up map name */
	strcpy( source, ExpandArg( argv[ i ] ) );
	Sys_Printf( "Loading %s\n", source );

	/* load the file */
	size = LoadFile( source, (void**) &header );
	if ( size == 0 || header == NULL ) {
		Sys_Printf( "Unable to load %s.\n", source );
		return -1;
	}

	/* analyze ident/version */
	memcpy( ident, header->ident, 4 );
	ident[ 4 ] = '\0';
	version = LittleLong( header->version );

	Sys_Printf( "Identity:      %s\n", ident );
	Sys_Printf( "Version:       %d\n", version );
	Sys_Printf( "---------------------------------------\n" );

	/* analyze each lump */
	for ( i = 0; i < 100; i++ )
	{
		/* call of duty swapped lump pairs */
		if ( lumpSwap ) {
			offset = LittleLong( header->lumps[ i ].length );
			length = LittleLong( header->lumps[ i ].offset );
		}

		/* standard lump pairs */
		else
		{
			offset = LittleLong( header->lumps[ i ].offset );
			length = LittleLong( header->lumps[ i ].length );
		}

		/* extract data */
		lump = (byte*) header + offset;
		lumpInt = LittleLong( (int) *( (int*) lump ) );
		lumpFloat = LittleFloat( (float) *( (float*) lump ) );
		memcpy( lumpString, (char*) lump, ( (size_t)length < sizeof( lumpString ) ? (size_t)length : sizeof( lumpString ) - 1 ) );
		lumpString[ sizeof( lumpString ) - 1 ] = '\0';

		/* print basic lump info */
		Sys_Printf( "Lump:          %d\n", i );
		Sys_Printf( "Offset:        %d bytes\n", offset );
		Sys_Printf( "Length:        %d bytes\n", length );

		/* only operate on valid lumps */
		if ( length > 0 ) {
			/* print data in 4 formats */
			Sys_Printf( "As hex:        %08X\n", lumpInt );
			Sys_Printf( "As int:        %d\n", lumpInt );
			Sys_Printf( "As float:      %f\n", lumpFloat );
			Sys_Printf( "As string:     %s\n", lumpString );

			/* guess lump type */
			if ( lumpString[ 0 ] == '{' && lumpString[ 2 ] == '"' ) {
				Sys_Printf( "Type guess:    IBSP LUMP_ENTITIES\n" );
			}
			else if ( strstr( lumpString, "textures/" ) ) {
				Sys_Printf( "Type guess:    IBSP LUMP_SHADERS\n" );
			}
			else
			{
				/* guess based on size/count */
				for ( lumpTest = lumpTests; lumpTest->radix > 0; lumpTest++ )
				{
					if ( ( length % lumpTest->radix ) != 0 ) {
						continue;
					}
					count = length / lumpTest->radix;
					if ( count < lumpTest->minCount ) {
						continue;
					}
					Sys_Printf( "Type guess:    %s (%d x %d)\n", lumpTest->name, count, lumpTest->radix );
				}
			}
		}

		Sys_Printf( "---------------------------------------\n" );

		/* end of file */
		if ( offset + length >= size ) {
			break;
		}
	}

	/* last stats */
	Sys_Printf( "Lump count:    %d\n", i + 1 );
	Sys_Printf( "File size:     %d bytes\n", size );

	/* return to caller */
	return 0;
}
