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

   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."

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



/* marker */
#define CONVERT_ASE_C



/* dependencies */
#include "q3map2.h"



/*
   ConvertSurface()
   converts a bsp drawsurface to an obj chunk
 */

int firstLightmap = 0;
int lastLightmap = -1;
static void ConvertLightmapToMTL( FILE *f, const char *base, int lightmapNum );

int objVertexCount = 0;
int objLastShaderNum = -1;
static void ConvertSurfaceToOBJ( FILE *f, bspModel_t *model, int modelNum, bspDrawSurface_t *ds, int surfaceNum, vec3_t origin ){
	int i, v, a, b, c;
	bspDrawVert_t   *dv;

	/* ignore patches for now */
	if ( ds->surfaceType != MST_PLANAR && ds->surfaceType != MST_TRIANGLE_SOUP ) {
		return;
	}

	fprintf( f, "g mat%dmodel%dsurf%d\r\n", ds->shaderNum, modelNum, surfaceNum );
	switch ( ds->surfaceType )
	{
	case MST_PLANAR:
		fprintf( f, "# SURFACETYPE MST_PLANAR\r\n" );
		break;
	case MST_TRIANGLE_SOUP:
		fprintf( f, "# SURFACETYPE MST_TRIANGLE_SOUP\r\n" );
		break;
	}

	/* export shader */
	if ( lightmapsAsTexcoord ) {
		if ( objLastShaderNum != ds->lightmapNum[0] ) {
			fprintf( f, "usemtl lm_%04d\r\n", ds->lightmapNum[0] + deluxemap );
			objLastShaderNum = ds->lightmapNum[0] + deluxemap;
		}
		if ( ds->lightmapNum[0] + (int)deluxemap < firstLightmap ) {
			Sys_FPrintf( SYS_WRN, "WARNING: lightmap %d out of range (exporting anyway)\n", ds->lightmapNum[0] + deluxemap );
			firstLightmap = ds->lightmapNum[0] + deluxemap;
		}
		if ( ds->lightmapNum[0] > lastLightmap ) {
			Sys_FPrintf( SYS_WRN, "WARNING: lightmap %d out of range (exporting anyway)\n", ds->lightmapNum[0] + deluxemap );
			lastLightmap = ds->lightmapNum[0] + deluxemap;
		}
	}
	else
	{
		if ( objLastShaderNum != ds->shaderNum ) {
			fprintf( f, "usemtl %s\r\n", bspShaders[ds->shaderNum].shader );
			objLastShaderNum = ds->shaderNum;
		}
	}

	/* export vertex */
	for ( i = 0; i < ds->numVerts; i++ )
	{
		v = i + ds->firstVert;
		dv = &bspDrawVerts[ v ];
		fprintf( f, "# vertex %d\r\n", i + objVertexCount + 1 );
		fprintf( f, "v %f %f %f\r\n", dv->xyz[ 0 ], dv->xyz[ 1 ], dv->xyz[ 2 ] );
		fprintf( f, "vn %f %f %f\r\n", dv->normal[ 0 ], dv->normal[ 1 ], dv->normal[ 2 ] );
		if ( lightmapsAsTexcoord ) {
			fprintf( f, "vt %f %f\r\n", dv->lightmap[0][0], 1.0 - dv->lightmap[0][1] );
		}
		else{
			fprintf( f, "vt %f %f\r\n", dv->st[ 0 ], 1.0 - dv->st[ 1 ] );
		}
	}

	/* export faces */
	for ( i = 0; i < ds->numIndexes; i += 3 )
	{
		a = bspDrawIndexes[ i + ds->firstIndex ];
		c = bspDrawIndexes[ i + ds->firstIndex + 1 ];
		b = bspDrawIndexes[ i + ds->firstIndex + 2 ];
		fprintf( f, "f %d/%d/%d %d/%d/%d %d/%d/%d\r\n",
				 a + objVertexCount + 1, a + objVertexCount + 1, a + objVertexCount + 1,
				 b + objVertexCount + 1, b + objVertexCount + 1, b + objVertexCount + 1,
				 c + objVertexCount + 1, c + objVertexCount + 1, c + objVertexCount + 1
				 );
	}

	objVertexCount += ds->numVerts;
}



/*
   ConvertModel()
   exports a bsp model to an ase chunk
 */

static void ConvertModelToOBJ( FILE *f, bspModel_t *model, int modelNum, vec3_t origin ){
	int i, s;
	bspDrawSurface_t    *ds;


	/* go through each drawsurf in the model */
	for ( i = 0; i < model->numBSPSurfaces; i++ )
	{
		s = i + model->firstBSPSurface;
		ds = &bspDrawSurfaces[ s ];
		ConvertSurfaceToOBJ( f, model, modelNum, ds, s, origin );
	}
}



/*
   ConvertShader()
   exports a bsp shader to an ase chunk
 */

static void ConvertShaderToMTL( FILE *f, bspShader_t *shader, int shaderNum ){
	shaderInfo_t    *si;
	char filename[ 1024 ];


	/* get shader */
	si = ShaderInfoForShader( shader->shader );
	if ( si == NULL ) {
		Sys_FPrintf( SYS_WRN, "WARNING: NULL shader in BSP\n" );
		return;
	}

	/* set bitmap filename */
	if ( si->shaderImage->filename[ 0 ] != '*' ) {
		strcpy( filename, si->shaderImage->filename );
	}
	else{
		sprintf( filename, "%s.tga", si->shader );
	}

	/* blender hates this, so let's not do it
	   for( c = filename; *c != '\0'; c++ )
	    if( *c == '/' )
	   *c = '\\';
	 */

	/* print shader info */
	fprintf( f, "newmtl %s\r\n", shader->shader );
	fprintf( f, "Kd %f %f %f\r\n", si->color[ 0 ], si->color[ 1 ], si->color[ 2 ] );
	if ( shadersAsBitmap ) {
		fprintf( f, "map_Kd %s\r\n", shader->shader );
	}
	else{
		/* blender hates this, so let's not do it
		    fprintf( f, "map_Kd ..\\%s\r\n", filename );
		 */
		fprintf( f, "map_Kd ../%s\r\n", filename );
	}
}

static void ConvertLightmapToMTL( FILE *f, const char *base, int lightmapNum ){
	/* print shader info */
	fprintf( f, "newmtl lm_%04d\r\n", lightmapNum );
	if ( lightmapNum >= 0 ) {
		/* blender hates this, so let's not do it
		    fprintf( f, "map_Kd %s\\lm_%04d.tga\r\n", base, lightmapNum );
		 */
		fprintf( f, "map_Kd %s/lm_%04d.tga\r\n", base, lightmapNum );
	}
}



/*
   ConvertBSPToASE()
   exports an 3d studio ase file from the bsp
 */

int ConvertBSPToOBJ( char *bspName ){
	int i, modelNum;
	FILE            *f, *fmtl;
	bspShader_t     *shader;
	bspModel_t      *model;
	entity_t        *e;
	vec3_t origin;
	const char      *key;
	char name[ 1024 ], base[ 1024 ], mtlname[ 1024 ], dirname[ 1024 ];


	/* note it */
	Sys_Printf( "--- Convert BSP to OBJ ---\n" );

	/* create the ase filename from the bsp name */
	strcpy( dirname, bspName );
	StripExtension( dirname );
	strcpy( name, bspName );
	StripExtension( name );
	strcat( name, ".obj" );
	Sys_Printf( "writing %s\n", name );
	strcpy( mtlname, bspName );
	StripExtension( mtlname );
	strcat( mtlname, ".mtl" );
	Sys_Printf( "writing %s\n", mtlname );

	ExtractFileBase( bspName, base );

	/* open it */
	f = fopen( name, "wb" );
	if ( f == NULL ) {
		Error( "Open failed on %s\n", name );
	}
	fmtl = fopen( mtlname, "wb" );
	if ( fmtl == NULL ) {
		Error( "Open failed on %s\n", mtlname );
	}

	/* print header */
	fprintf( f, "o %s\r\n", base );
	fprintf( f, "# Generated by Q3Map2 (ydnar) -convert -format obj\r\n" );
	fprintf( f, "mtllib %s.mtl\r\n", base );

	fprintf( fmtl, "# Generated by Q3Map2 (ydnar) -convert -format obj\r\n" );
	if ( lightmapsAsTexcoord ) {
		int lightmapCount;
		for ( lightmapCount = 0; lightmapCount < numBSPLightmaps; lightmapCount++ )
			;
		for ( ; ; lightmapCount++ )
		{
			char buf[1024];
			FILE *tmp;
			snprintf( buf, sizeof( buf ), "%s/lm_%04d.tga", dirname, lightmapCount );
			buf[sizeof( buf ) - 1] = 0;
			tmp = fopen( buf, "rb" );
			if ( !tmp ) {
				break;
			}
			fclose( tmp );
		}
		lastLightmap = lightmapCount - 1;
	}
	else
	{
		for ( i = 0; i < numBSPShaders; i++ )
		{
			shader = &bspShaders[ i ];
			ConvertShaderToMTL( fmtl, shader, i );
		}
	}

	/* walk entity list */
	for ( i = 0; i < numEntities; i++ )
	{
		/* get entity and model */
		e = &entities[ i ];
		if ( i == 0 ) {
			modelNum = 0;
		}
		else
		{
			key = ValueForKey( e, "model" );
			if ( key[ 0 ] != '*' ) {
				continue;
			}
			modelNum = atoi( key + 1 );
		}
		model = &bspModels[ modelNum ];

		/* get entity origin */
		key = ValueForKey( e, "origin" );
		if ( key[ 0 ] == '\0' ) {
			VectorClear( origin );
		}
		else{
			GetVectorForKey( e, "origin", origin );
		}

		/* convert model */
		ConvertModelToOBJ( f, model, modelNum, origin );
	}

	if ( lightmapsAsTexcoord ) {
		for ( i = firstLightmap; i <= lastLightmap; i++ )
			ConvertLightmapToMTL( fmtl, base, i );
	}

	/* close the file and return */
	fclose( f );
	fclose( fmtl );

	/* return to sender */
	return 0;
}
