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

/**
 * Creates and initializes a new PE structure with an asset list and
 * tag name.
 *
 * The initialized structure must be manually destroyed using free().
 * The remaining fields of the PE are to be set by yourself.
 *
 * The value NULL may be specified for one or both strings to indicate
 * that string is not to be used.
 *
 * @param asset_list String containing asset list.
 * @param tag_name String containing the PE's tag name.
 * @return An initialized aw_object_data_particles structure.
 */
aw_object_data_particles* new_particle(const char* asset_list, const char* tag_name)
{
	size_t alen = (asset_list == NULL)? 0 : strlen(asset_list);
	size_t tlen = (tag_name == NULL)? 0 : strlen(tag_name);
	size_t psiz = alen + tlen + sizeof(aw_object_data_particles);
	aw_object_data_particles* pe = NULL;

	pe = (aw_object_data_particles*)malloc(psiz);
	memset(pe, 0, psiz);

	pe->asset_list_len = (unsigned short)(alen);
	pe->name_len = (unsigned char)(tlen);

	if (alen != 0)
		memcpy(pe->str_data, asset_list, alen);

	if (tlen != 0)
		memcpy(pe->str_data + alen, tag_name, tlen);

	return pe;
}

/**
 * Prepares an initialized PE structure to be built in the world.
 *
 * This function also accounts for the bug where the object
 * action field may be used by the world server if it was
 * last set by a previous SDK method.
 *
 * After calling this function use either the aw_object_add or
 * aw_object_load SDK methods after setting additional attributes
 * defining the PE location, etc.
 *
 * @param pe The particle emitter to be built.
 */
void prepare_particle(const aw_object_data_particles* pe)
{
	unsigned int psiz = 0;

	psiz = sizeof(aw_object_data_particles);
	psiz += pe->asset_list_len;
	psiz += pe->name_len;

	aw_string_set(AW_OBJECT_DESCRIPTION, "");
	aw_string_set(AW_OBJECT_ACTION, "");
	aw_int_set(AW_OBJECT_TYPE, AW_OBJECT_TYPE_PARTICLES);
	aw_data_set(AW_OBJECT_DATA, (char*)pe, psiz);
}