// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef _ESP_TRANSPORT_INTERNAL_H_
#define _ESP_TRANSPORT_INTERNAL_H_

#include "esp_transport.h"
#include "sys/queue.h"

typedef int (*get_socket_func)(esp_transport_handle_t t);

/**
 * Transport layer structure, which will provide functions, basic properties for transport types
 */
struct esp_transport_item_t {
    int             port;
    char            *scheme;        /*!< Tag name */
    void            *data;          /*!< Additional transport data */
    connect_func    _connect;       /*!< Connect function of this transport */
    io_read_func    _read;          /*!< Read */
    io_func         _write;         /*!< Write */
    trans_func      _close;         /*!< Close */
    poll_func       _poll_read;     /*!< Poll and read */
    poll_func       _poll_write;    /*!< Poll and write */
    trans_func      _destroy;       /*!< Destroy and free transport */
    connect_async_func _connect_async;      /*!< non-blocking connect function of this transport */
    payload_transfer_func  _parent_transfer;        /*!< Function returning underlying transport layer */
    get_socket_func        _get_socket;
    esp_tls_error_handle_t     error_handle;            /*!< Pointer to esp-tls error handle */

    STAILQ_ENTRY(esp_transport_item_t) next;
};

/**
 * @brief Returns underlying socket for the supplied transport handle
 *
 * @param t Transport handle
 *
 * @return Socket file descriptor in case of success
 *         -1 in case of error
 */
int esp_transport_get_socket(esp_transport_handle_t t);


#endif //_ESP_TRANSPORT_INTERNAL_H_