/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2025 Alexandre Malki <alexandre.malki@kebag-logic.com> */
/* SPDX-License-Identifier: MIT */


#include "es-builder.h"
#include "aecp-aem-descriptors.h"

/**
 * \brief The goal of this modules is to create a an entity and
 * 	attache the necessary status or resources to it so they
 * 	do no have to be seperated and referenced somewhere else.
 *
 * 	In a sense, it encapsulates the descriptor, and the states
 * 	information that will be altered either by a aecp/acmp commands
 * 	or internal state changes reflected into the counters.
 */

/** The callback type used for the different entity descriptor  */
typedef void* (*es_builder_cb_t) (struct server *server, uint16_t type,
		uint16_t index, size_t size, void *ptr);

/** Structure holding all necessary cb
 * \todo for the future of compatibility between milan's version
 * and plain AVB, add the right callback, that would reduce
 * code complexity and increase reusability.
 * As well as having multiple entity model defined using different
 * entity on the same machine
 */
struct es_builder_st {
	es_builder_cb_t build_descriptor_cb;
};

/** All callback that needs a status information */
static const struct es_builder_st es_builder[AVB_AEM_DESC_LAST_RESERVED_17221] =
{
};

/**
 * \brief, should be called when creating an a descriptor, it will attach
 * the right state variable that are necessary for counters, stream info
 * and so on...
 */
void es_builder_add_descriptor(struct server *server, uint16_t type,
		uint16_t index, size_t size, void *ptr_aem)
{
	void *desc_ptr;
	struct descriptor *d;

	if (!server) {
		pw_log_error("Invalid server, it is empty %p\n", server);
		spa_assert(0);
	}

	if (type >= AVB_AEM_DESC_LAST_RESERVED_17221) {
		pw_log_error("Invalid Type %u\n", type);
		spa_assert(0);
	}

	/* Look if the descriptor has a callback to attach more status data */
	if (!es_builder[type].build_descriptor_cb) {
		if (!server_add_descriptor(server, type, index, size, ptr_aem)) {
			pw_log_error("Could not allocate descriptor %u at "
				"index %u the avb aem type\n", type, index);

			spa_assert(0);
		}
	} else {
		desc_ptr = es_builder[type].build_descriptor_cb(server, type,
				index, size, ptr_aem);
		if (!desc_ptr) {
			pw_log_error("Could not allocate specific descriptr "
				"%u at  index %u the avb aem type\n",
				type, index);

			spa_assert(0);
		}
		d = (struct descriptor *) desc_ptr;
		d->size = size;
	}
}