/**********************************************************************
 * $Id$
 *
 * 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"

LWCOMPOUND *
lwcompound_deserialize(uchar *serialized)
{
        LWCOMPOUND *result;
        LWGEOM_INSPECTED *insp;
        int type = lwgeom_getType(serialized[0]);
        int i;

        if(type != COMPOUNDTYPE)
        {
                lwerror("lwcompound_deserialize called on non compound: %d", type);
                return NULL;
        }

        insp = lwgeom_inspect(serialized);

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

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

        for(i = 0; i < insp->ngeometries; i++)
        {
                if(lwgeom_getType(insp->sub_geoms[i][0]) == LINETYPE)
                        result->geoms[i] = (LWGEOM *)lwline_deserialize(insp->sub_geoms[i]);
                else
                        result->geoms[i] = (LWGEOM *)lwcircstring_deserialize(insp->sub_geoms[i]);
                if(TYPE_NDIMS(result->geoms[i]->type) != TYPE_NDIMS(result->type))
                {
                        lwerror("Mixed dimensions (compound: %d, line/circularstring %d:%d)",
                            TYPE_NDIMS(result->type), i,
                            TYPE_NDIMS(result->geoms[i]->type)
                        );
                        lwfree(result);
                        return NULL;
                }
        }
        return result;
}

/*
 * Add 'what' to this string at position 'where'
 * where=0 == prepend
 * where=-1 == append
 * Returns a COMPOUND or a GEOMETRYCOLLECTION
 */
LWGEOM *
lwcompound_add(const LWCOMPOUND *to, uint32 where, const LWGEOM *what)
{
        LWCOLLECTION *col;
        LWGEOM **geoms;
        int newtype;

        LWDEBUG(2, "lwcompound_add called.");

        if(where != -1 && where != 0)
        {
                lwerror("lwcompound_add only supports 0 or -1 as a second argument, not %d", where);
                return NULL;
        }

        /* dimensions compatibility are checked by caller */

        /* Construct geoms array */
        geoms = lwalloc(sizeof(LWGEOM *)*2);
        if(where == -1) /* append */
        {
                geoms[0] = lwgeom_clone((LWGEOM *)to);
                geoms[1] = lwgeom_clone(what);
        }
        else /* prepend */
        {
                geoms[0] = lwgeom_clone(what);
                geoms[1] = lwgeom_clone((LWGEOM *)to);
        }

        /* reset SRID and wantbbox flag from component types */
        geoms[0]->SRID = geoms[1]->SRID = -1;
        TYPE_SETHASSRID(geoms[0]->type, 0);
        TYPE_SETHASSRID(geoms[1]->type, 0);
        TYPE_SETHASBBOX(geoms[0]->type, 0);
        TYPE_SETHASBBOX(geoms[1]->type, 0);

        /* Find appropriate geom type */
        if(TYPE_GETTYPE(what->type) == LINETYPE || TYPE_GETTYPE(what->type) == CIRCSTRINGTYPE) newtype = COMPOUNDTYPE;
        else newtype = COLLECTIONTYPE;

        col = lwcollection_construct(newtype,
                to->SRID, NULL, 2, geoms);

        return (LWGEOM *)col;
}