/**********************************************************************
 * $Id: lwmpoly.c 2797 2008-05-31 09:56:44Z mcayland $
 *
 * PostGIS - Spatial Types for PostgreSQL
 * http://postgis.refractions.net
 * Copyright 2001-2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU General Public Licence. See the COPYING file.
 * 
 **********************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "liblwgeom.h"


LWMPOLY *
lwmpoly_deserialize(uchar *srl)
{
	LWMPOLY *result;
	LWGEOM_INSPECTED *insp;
	int type = lwgeom_getType(srl[0]);
	int i;

	LWDEBUG(2, "lwmpoly_deserialize called");

	if ( type != MULTIPOLYGONTYPE ) 
	{
		lwerror("lwmpoly_deserialize called on NON multipoly: %d",
			type);
		return NULL;
	}

	insp = lwgeom_inspect(srl);

	result = lwalloc(sizeof(LWMPOLY));
	result->type = insp->type;
	result->SRID = insp->SRID;
	result->ngeoms = insp->ngeometries;
	result->geoms = lwalloc(sizeof(LWPOLY *)*insp->ngeometries);

	if (lwgeom_hasBBOX(srl[0]))
	{
		result->bbox = lwalloc(sizeof(BOX2DFLOAT4));
		memcpy(result->bbox, srl+1, sizeof(BOX2DFLOAT4));
	}
	else result->bbox = NULL;

	for (i=0; i<insp->ngeometries; i++)
	{
		result->geoms[i] = lwpoly_deserialize(insp->sub_geoms[i]);
		if ( TYPE_NDIMS(result->geoms[i]->type) != TYPE_NDIMS(result->type) )
		{
			lwerror("Mixed dimensions (multipoly:%d, poly%d:%d)",
				TYPE_NDIMS(result->type), i,
				TYPE_NDIMS(result->geoms[i]->type)
			);
			return NULL;
		}
	}

	return result;
}

/*
 * Add 'what' to this multiline at position 'where'.
 * where=0 == prepend
 * where=-1 == append
 * Returns a MULTIPOLY or a COLLECTION
 */
LWGEOM *
lwmpoly_add(const LWMPOLY *to, uint32 where, const LWGEOM *what)
{
	LWCOLLECTION *col;
	LWGEOM **geoms;
	int newtype;
	uint32 i;

	if ( where == -1 ) where = to->ngeoms;
	else if ( where < -1 || where > to->ngeoms )
	{
		lwerror("lwmline_add: add position out of range %d..%d",
			-1, to->ngeoms);
		return NULL;
	}

	/* dimensions compatibility are checked by caller */

	/* Construct geoms array */
	geoms = lwalloc(sizeof(LWGEOM *)*(to->ngeoms+1));
	for (i=0; i<where; i++)
	{
		geoms[i] = lwgeom_clone((LWGEOM *)to->geoms[i]);
	}
	geoms[where] = lwgeom_clone(what);
	for (i=where; i<to->ngeoms; i++)
	{
		geoms[i+1] = lwgeom_clone((LWGEOM *)to->geoms[i]);
	}

	if ( TYPE_GETTYPE(what->type) == POLYGONTYPE ) newtype = MULTIPOLYGONTYPE;
	else newtype = COLLECTIONTYPE;

	col = lwcollection_construct(newtype,
		to->SRID, NULL,
		to->ngeoms+1, geoms);
	
	return (LWGEOM *)col;

}