/*  Bluetooth Mesh */

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/kernel.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <zephyr/types.h>
#include <zephyr/sys/util.h>
#include <zephyr/sys/byteorder.h>

#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/mesh.h>

#include "msg.h"

#include <common/bt_str.h>

#define LOG_LEVEL CONFIG_BT_MESH_MODEL_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(bt_mesh_large_comp_data_cli);

#include "net.h"
#include "access.h"
#include "foundation.h"

static struct bt_mesh_large_comp_data_cli *cli;
static int32_t msg_timeout;

static int data_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
		       struct net_buf_simple *buf, uint32_t op,
		       void (*cb)(struct bt_mesh_large_comp_data_cli *cli, uint16_t addr,
				  struct bt_mesh_large_comp_data_rsp *rsp))
{
	struct bt_mesh_large_comp_data_rsp *rsp;
	uint8_t page;
	uint16_t offset;
	uint16_t total_size;

	LOG_DBG("net_idx 0x%04x app_idx 0x%04x src 0x%04x len %u: %s",
		ctx->net_idx, ctx->app_idx, ctx->addr, buf->len,
		bt_hex(buf->data, buf->len));

	page = net_buf_simple_pull_u8(buf);
	offset = net_buf_simple_pull_le16(buf);
	total_size = net_buf_simple_pull_le16(buf);

	if (bt_mesh_msg_ack_ctx_match(&cli->ack_ctx, op, ctx->addr, (void **)&rsp)) {
		rsp->page = page;
		rsp->offset = offset;
		rsp->total_size = total_size;

		if (rsp->data) {
			net_buf_simple_add_mem(rsp->data, buf->data,
					       MIN(net_buf_simple_tailroom(rsp->data), buf->len));
		}

		bt_mesh_msg_ack_ctx_rx(&cli->ack_ctx);
	}

	if (cb) {
		struct bt_mesh_large_comp_data_rsp status_rsp = {
			.page = page,
			.offset = offset,
			.total_size = total_size,
			.data = buf,
		};

		cb(cli, ctx->addr, &status_rsp);
	}

	return 0;
}

static int large_comp_data_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
				  struct net_buf_simple *buf)
{
	return data_status(model, ctx, buf, OP_LARGE_COMP_DATA_STATUS,
			   (cli->cb && cli->cb->large_comp_data_status ?
			    cli->cb->large_comp_data_status : NULL));
}

static int models_metadata_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
				  struct net_buf_simple *buf)
{
	return data_status(model, ctx, buf, OP_MODELS_METADATA_STATUS,
			   (cli->cb && cli->cb->models_metadata_status ?
			    cli->cb->models_metadata_status : NULL));
}

const struct bt_mesh_model_op _bt_mesh_large_comp_data_cli_op[] = {
	{ OP_LARGE_COMP_DATA_STATUS,   BT_MESH_LEN_MIN(5),  large_comp_data_status },
	{ OP_MODELS_METADATA_STATUS,   BT_MESH_LEN_MIN(5),  models_metadata_status },
	BT_MESH_MODEL_OP_END,
};

static int large_comp_data_cli_init(struct bt_mesh_model *model)
{
	if (!bt_mesh_model_in_primary(model)) {
		LOG_ERR("Large Comp Data Client only allowed in primary element");
		return -EINVAL;
	}

	model->keys[0] = BT_MESH_KEY_DEV_ANY;
	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;

	cli = model->user_data;
	cli->model = model;

	msg_timeout = 5000;
	bt_mesh_msg_ack_ctx_init(&cli->ack_ctx);

	return 0;
}

const struct bt_mesh_model_cb _bt_mesh_large_comp_data_cli_cb = {
	.init = large_comp_data_cli_init,
};

static int data_get(uint16_t net_idx, uint16_t addr, uint32_t op, uint32_t status_op, uint8_t page,
	     size_t offset, struct bt_mesh_large_comp_data_rsp *rsp)
{
	BT_MESH_MODEL_BUF_DEFINE(msg, op, 3);
	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_DEV(net_idx, addr);
	const struct bt_mesh_msg_rsp_ctx rsp_ctx = {
		.ack = &cli->ack_ctx,
		.op = status_op,
		.user_data = rsp,
		.timeout = msg_timeout,
	};

	bt_mesh_model_msg_init(&msg, op);
	net_buf_simple_add_u8(&msg, page);
	net_buf_simple_add_le16(&msg, offset);

	return bt_mesh_msg_ackd_send(cli->model, &ctx, &msg, rsp ? &rsp_ctx : NULL);
}

int bt_mesh_large_comp_data_get(uint16_t net_idx, uint16_t addr, uint8_t page,
				size_t offset, struct bt_mesh_large_comp_data_rsp *rsp)
{
	return data_get(net_idx, addr, OP_LARGE_COMP_DATA_GET, OP_LARGE_COMP_DATA_STATUS,
			page, offset, rsp);
}

int bt_mesh_models_metadata_get(uint16_t net_idx, uint16_t addr, uint8_t page,
				size_t offset, struct bt_mesh_large_comp_data_rsp *rsp)
{
	return data_get(net_idx, addr, OP_MODELS_METADATA_GET, OP_MODELS_METADATA_STATUS,
			page, offset, rsp);
}