/** Sample value remapping for path source muxing.
 *
 * @file
 * @author Steffen Vogel <post@steffenvogel.de>
 * @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
 * @license Apache 2.0
 *********************************************************************************/

#include <villas/mapping_list.hpp>
#include <villas/exceptions.hpp>

using namespace villas;
using namespace villas::node;

int MappingList::parse(json_t *json)
{
	int ret;

	size_t i;
	json_t *json_entry;
	json_t *json_mapping;

	if (json_is_string(json)) {
		json_mapping = json_array();
		json_array_append(json_mapping, json);
	}
	else if (json_is_array(json))
		json_mapping = json_incref(json);
	else
		return -1;

	json_array_foreach(json_mapping, i, json_entry) {
		auto me = std::make_shared<MappingEntry>();
		if (!me)
			throw MemoryAllocationError();

		ret = me->parse(json_entry);
		if (ret)
			goto out;

		push_back(me);
	}

	ret = 0;

out:	json_decref(json_mapping);

	return ret;
}

int MappingList::remap(struct Sample *remapped, const struct Sample *original) const
{
	int ret;

	for (auto me : *this) {
		ret = me->update(remapped, original);
		if (ret)
			return ret;
	}

	return 0;
}

int MappingList::prepare(NodeList &nodes)
{
	int ret;

	unsigned off = 0;
	for (auto me : *this) {
		ret = me->prepare(nodes);
		if (ret)
			return ret;

		me->offset = off;
		off += me->length;
	}

	return 0;
}