/** @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;
	u8_t pos;
	u8_t buf_max_len;
	u8_t state;
	u8_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, u32_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, u32_t *min, u32_t *max);
int at_list_get_string(struct at_client *at, char *name, u8_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);