/** @file at.h
 *  @brief Internal APIs for AT command handling.
 */

/*
 * Copyright (c) 2015-2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

enum at_result {
    AT_RESULT_OK,
    AT_RESULT_ERROR,
    AT_RESULT_CME_ERROR
};

enum at_cme {
    CME_ERROR_AG_FAILURE = 0,
    CME_ERROR_NO_CONNECTION_TO_PHONE = 1,
    CME_ERROR_OPERATION_NOT_ALLOWED = 3,
    CME_ERROR_OPERATION_NOT_SUPPORTED = 4,
    CME_ERROR_PH_SIM_PIN_REQUIRED = 5,
    CME_ERROR_SIM_NOT_INSERTED = 10,
    CME_ERROR_SIM_PIN_REQUIRED = 11,
    CME_ERROR_SIM_PUK_REQUIRED = 12,
    CME_ERROR_SIM_FAILURE = 13,
    CME_ERROR_SIM_BUSY = 14,
    CME_ERROR_INCORRECT_PASSWORD = 16,
    CME_ERROR_SIM_PIN2_REQUIRED = 17,
    CME_ERROR_SIM_PUK2_REQUIRED = 18,
    CME_ERROR_MEMORY_FULL = 20,
    CME_ERROR_INVALID_INDEX = 21,
    CME_ERROR_MEMORY_FAILURE = 23,
    CME_ERROR_TEXT_STRING_TOO_LONG = 24,
    CME_ERROR_INVALID_CHARS_IN_TEXT_STRING = 25,
    CME_ERROR_DIAL_STRING_TO_LONG = 26,
    CME_ERROR_INVALID_CHARS_IN_DIAL_STRING = 27,
    CME_ERROR_NO_NETWORK_SERVICE = 30,
    CME_ERROR_NETWORK_TIMEOUT = 31,
    CME_ERROR_NETWORK_NOT_ALLOWED = 32,
    CME_ERROR_UNKNOWN = 33,
};

enum at_state {
    AT_STATE_START,
    AT_STATE_START_CR,
    AT_STATE_START_LF,
    AT_STATE_GET_CMD_STRING,
    AT_STATE_PROCESS_CMD,
    AT_STATE_GET_RESULT_STRING,
    AT_STATE_PROCESS_RESULT,
    AT_STATE_PROCESS_AG_NW_ERR,
    AT_STATE_UNSOLICITED_CMD,
    AT_STATE_END
};

enum at_cmd_state {
    AT_CMD_START,
    AT_CMD_GET_VALUE,
    AT_CMD_PROCESS_VALUE,
    AT_CMD_STATE_END_LF,
    AT_CMD_STATE_END
};

enum at_cmd_type {
    AT_CMD_TYPE_NORMAL,
    AT_CMD_TYPE_UNSOLICITED,
    AT_CMD_TYPE_OTHER
};

struct at_client;

/* Callback at_resp_cb_t used to parse response value received for the
 * particular AT command. Eg: +CIND=<value>
 */
typedef int (*at_resp_cb_t)(struct at_client *at, struct net_buf *buf);

/* Callback at_finish_cb used to monitor the success or failure of the AT
 * command received from server.
 * Argument 'cme_err' is valid only when argument 'result' is equal to
 * AT_RESULT_CME_ERROR
 */
typedef int (*at_finish_cb_t)(struct at_client *at, enum at_result result,
                              enum at_cme cme_err);
typedef int (*parse_val_t)(struct at_client *at);
typedef int (*handle_parse_input_t)(struct at_client *at, struct net_buf *buf);
typedef int (*handle_cmd_input_t)(struct at_client *at, struct net_buf *buf,
                                  const char *prefix, parse_val_t func,
                                  enum at_cmd_type type);

struct at_client {
    char *buf;
    uint8_t pos;
    uint8_t buf_max_len;
    uint8_t state;
    uint8_t cmd_state;
    at_resp_cb_t resp;
    at_resp_cb_t unsolicited;
    at_finish_cb_t finish;
};

/* Register the callback functions */
void at_register(struct at_client *at, at_resp_cb_t resp,
                 at_finish_cb_t finish);
void at_register_unsolicited(struct at_client *at, at_resp_cb_t unsolicited);
int at_get_number(struct at_client *at, uint32_t *val);
/* This parsing will only works for non-fragmented net_buf */
int at_parse_input(struct at_client *at, struct net_buf *buf);
/* This command parsing will only works for non-fragmented net_buf */
int at_parse_cmd_input(struct at_client *at, struct net_buf *buf,
                       const char *prefix, parse_val_t func,
                       enum at_cmd_type type);
int at_check_byte(struct net_buf *buf, char check_byte);
int at_list_get_range(struct at_client *at, uint32_t *min, uint32_t *max);
int at_list_get_string(struct at_client *at, char *name, uint8_t len);
int at_close_list(struct at_client *at);
int at_open_list(struct at_client *at);
int at_has_next_list(struct at_client *at);
