/*
 * Copyright (C) 2014 BlueKitchen GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
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 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 *
 * Please inquire about commercial licensing options at 
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 */

/**
 * @title HFP Audio Gateway (AG)
 *
 */

#ifndef BTSTACK_HFP_AG_H
#define BTSTACK_HFP_AG_H

#include "hci.h"
#include "classic/sdp_client_rfcomm.h"
#include "classic/hfp.h"
#include "classic/hfp_gsm_model.h"

#if defined __cplusplus
extern "C" {
#endif

typedef enum {
    HFP_AG_VRA_EVENT_NONE,
    HFP_AG_VRA_EVENT_CAN_SEND_NOW,
    HFP_AG_VRA_EVENT_OK,
    HFP_AG_VRA_EVENT_ERROR,
    HFP_AG_VRA_EVENT_SCO_CONNECTED,
    HFP_AG_VRA_EVENT_SCO_DISCONNECTED,
    HFP_AG_VRA_EVENT_AG_ACTIVATE,
    HFP_AG_VRA_EVENT_AG_DEACTIVATE,
    HFP_AG_VRA_EVENT_AG_STATE,
    HFP_AG_VRA_EVENT_HF_ACTIVATE,
    HFP_AG_VRA_EVENT_HF_ACTIVATE_ENHANCED,
    HFP_AG_VRA_EVENT_HF_DEACTIVATE,
} hfp_ag_vra_event_type_t;

/* API_START */
typedef struct {
    uint8_t type;
    const char * number;
    hfp_phone_service_t service;
} hfp_phone_number_t;

/**
 * @brief Create HFP Audio Gateway (AG) SDP service record. 
 * @param service
 * @param rfcomm_channel_nr
 * @param name or NULL for default value. Provide "" (empty string) to skip attribute
 * @param ability_to_reject_call
 * @param supported_features 32-bit bitmap, see HFP_AGSF_* values in hfp.h
 * @param codecs_nr
 * @param codecs
 */
void hfp_ag_create_sdp_record_with_codecs(uint8_t * service, uint32_t service_record_handle, int rfcomm_channel_nr,
                                          const char * name, uint8_t ability_to_reject_call, uint16_t supported_features,
                                          uint8_t codecs_nr, const uint8_t * codecs);

/**
 * @brief Set up HFP Audio Gateway (AG) device without additional supported features.
 * @param rfcomm_channel_nr
 */
void hfp_ag_init(uint8_t rfcomm_channel_nr);

/**
 * @brief Set codecs. 
 * @param codecs_nr
 * @param codecs
 */
void hfp_ag_init_codecs(uint8_t codecs_nr, const uint8_t * codecs);

/**
 * @brief Set supported features.
 * @param supported_features 32-bit bitmap, see HFP_AGSF_* values in hfp.h
 */
void hfp_ag_init_supported_features(uint32_t supported_features);

/**
 * @brief Set AG indicators. 
 * @param indicators_nr
 * @param indicators
 */
void hfp_ag_init_ag_indicators(int ag_indicators_nr, const hfp_ag_indicator_t * ag_indicators);

/**
 * @brief Set HF indicators. 
 * @param indicators_nr
 * @param indicators
 */
void hfp_ag_init_hf_indicators(int hf_indicators_nr, const hfp_generic_status_indicator_t * hf_indicators);

/**
 * @brief Set Call Hold services. 
 * @param indicators_nr
 * @param indicators
 */
void hfp_ag_init_call_hold_services(int call_hold_services_nr, const char * call_hold_services[]);

/**
 * @brief Provide Apple Device information upon AT+XAPL
 * @param device
 * @param features
 */
void hfp_ag_init_apple_identification(const char * device, uint8_t features);


/**
 * @brief Register callback for the HFP Audio Gateway (AG) client. 
 * @param callback
 */
void hfp_ag_register_packet_handler(btstack_packet_handler_t callback);

/**
 * @brief Register custom AT command.
 * @param hfp_custom_at_command (with 'AT+' prefix)
 */
void hfp_ag_register_custom_at_command(hfp_custom_at_command_t * custom_at_command);

/**
 * @brief Enable/Disable in-band ring tone.
 *
 * @param use_in_band_ring_tone
 */
void hfp_ag_set_use_in_band_ring_tone(int use_in_band_ring_tone);


// actions used by local device / user

/**
 * @brief Establish RFCOMM connection, and perform service level connection agreement:
 * - exchange of supported features
 * - report Audio Gateway (AG) indicators and their status 
 * - enable indicator status update in the AG
 * - accept the information about available codecs in the Hands-Free (HF), if sent
 * - report own information describing the call hold and multiparty services, if possible
 * - report which HF indicators are enabled on the AG, if possible
 * The status of SLC connection establishment is reported via
 * HFP_SUBEVENT_SERVICE_LEVEL_CONNECTION_ESTABLISHED.
 *
 * @param  bd_addr of HF
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *                  - ERROR_CODE_COMMAND_DISALLOWED if connection already exists or connection in wrong state, or
 *                  - BTSTACK_MEMORY_ALLOC_FAILED 
 *
 */
uint8_t hfp_ag_establish_service_level_connection(bd_addr_t bd_addr);

/**
 * @brief Release the RFCOMM channel and the audio connection between the HF and the AG. 
 * If the audio connection exists, it will be released.
 * The status of releasing the SLC connection is reported via
 * HFP_SUBEVENT_SERVICE_LEVEL_CONNECTION_RELEASED.
 *
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist
 */
uint8_t hfp_ag_release_service_level_connection(hci_con_handle_t acl_handle);

/**
 * @brief Establish audio connection.
 * The status of Audio connection establishment is reported via HSP_SUBEVENT_AUDIO_CONNECTION_COMPLETE.
 *
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist
 */
uint8_t hfp_ag_establish_audio_connection(hci_con_handle_t acl_handle);

/**
 * @brief Release audio connection.
 * The status of releasing the Audio connection is reported via HSP_SUBEVENT_AUDIO_DISCONNECTION_COMPLETE.
 * 
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist
 */
uint8_t hfp_ag_release_audio_connection(hci_con_handle_t acl_handle);

/**
 * @brief Put the current call on hold, if it exists, and accept incoming call. 
 */
void hfp_ag_answer_incoming_call(void);

/**
 * @brief Join held call with active call.
 */
void hfp_ag_join_held_call(void);

/**
 * @brief Reject incoming call, if exists, or terminate active call.
 */
void hfp_ag_terminate_call(void);

/**
 * @brief Put incoming call on hold.
 */
void hfp_ag_hold_incoming_call(void);

/**
 * @brief Accept the held incoming call.
 */
void hfp_ag_accept_held_incoming_call(void);

/**
 * @brief Reject the held incoming call.
 */
void hfp_ag_reject_held_incoming_call(void);

/**
 * @brief Set microphone gain. 
 *
 * @param acl_handle
 * @param gain Valid range: [0,15]
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if invalid gain range
 */
uint8_t hfp_ag_set_microphone_gain(hci_con_handle_t acl_handle, int gain);

/**
 * @brief Set speaker gain.
 *
 * @param acl_handle
 * @param gain Valid range: [0,15]
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if invalid gain range
 */
uint8_t hfp_ag_set_speaker_gain(hci_con_handle_t acl_handle, int gain);

/**
 * @brief Set battery level.
 *
 * @param battery_level Valid range: [0,5]
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if invalid battery level range
 */
uint8_t hfp_ag_set_battery_level(int battery_level);

/**
 * @brief Clear last dialed number.
 */
void hfp_ag_clear_last_dialed_number(void);

/**
 * @brief Set last dialed number.
 */
void hfp_ag_set_last_dialed_number(const char * number);

/**
 * @brief Notify the HF that an incoming call is waiting 
 * during an ongoing call. The notification will be sent only if the HF has
 * has previously enabled the "Call Waiting notification" in the AG. 
 *
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if call waiting notification is not enabled
 */
uint8_t hfp_ag_notify_incoming_call_waiting(hci_con_handle_t acl_handle);

// Voice Recognition

/**
 * @brief Activate voice recognition and emit HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED event with status ERROR_CODE_SUCCESS 
 * if successful. Prerequisite is established SLC.
 *
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if feature HFP_(HF/AG)SF_VOICE_RECOGNITION_FUNCTION is not supported by HF and AG, or already activated
 */
uint8_t hfp_ag_activate_voice_recognition(hci_con_handle_t acl_handle);

/**
 * @brief Deactivate voice recognition and emit HFP_SUBEVENT_VOICE_RECOGNITION_DEACTIVATED event with status ERROR_CODE_SUCCESS 
 * if successful. Prerequisite is established SLC.
 *
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if feature HFP_(HF/AG)SF_VOICE_RECOGNITION_FUNCTION is not supported by HF and AG, or already deactivated
 */
uint8_t hfp_ag_deactivate_voice_recognition(hci_con_handle_t acl_handle);

/**
 * @brief Notify HF that sound will be played and HFP_SUBEVENT_ENHANCED_VOICE_RECOGNITION_AG_IS_STARTING_SOUND event with status ERROR_CODE_SUCCESS 
 * if successful, otherwise ERROR_CODE_COMMAND_DISALLOWED.
 *
 * @param acl_handle
 * @param activate
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if feature HFP_(HF/AG)SF_ENHANCED_VOICE_RECOGNITION_STATUS is not supported by HF and AG
 */
uint8_t hfp_ag_enhanced_voice_recognition_report_sending_audio(hci_con_handle_t acl_handle);

/**
 * @brief Notify HF that AG is ready for input and emit HFP_SUBEVENT_ENHANCED_VOICE_RECOGNITION_AG_READY_TO_ACCEPT_AUDIO_INPUT event with status ERROR_CODE_SUCCESS 
 * if successful, otherwise ERROR_CODE_COMMAND_DISALLOWED.
 *
 * @param acl_handle
 * @param activate
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if feature HFP_(HF/AG)SF_ENHANCED_VOICE_RECOGNITION_STATUS is not supported by HF and AG
 */
uint8_t hfp_ag_enhanced_voice_recognition_report_ready_for_audio(hci_con_handle_t acl_handle);

/**
 * @brief Notify that AG is processing input and emit HFP_SUBEVENT_ENHANCED_VOICE_RECOGNITION_AG_IS_PROCESSING_AUDIO_INPUT event with status ERROR_CODE_SUCCESS 
 * if successful, otherwise ERROR_CODE_COMMAND_DISALLOWED.
 *
 * @param acl_handle
 * @param activate
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if feature HFP_(HF/AG)SF_ENHANCED_VOICE_RECOGNITION_STATUS is not supported by HF and AG
 */
uint8_t hfp_ag_enhanced_voice_recognition_report_processing_input(hci_con_handle_t acl_handle);

/**
 * @brief Send enhanced audio recognition message and HFP_SUBEVENT_ENHANCED_VOICE_RECOGNITION_AG_MESSAGE_SENT event with status ERROR_CODE_SUCCESS 
 * if successful, otherwise ERROR_CODE_COMMAND_DISALLOWED.
 *
 * @param acl_handle
 * @param activate
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, 
                - ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE if the message size exceeds the HFP_MAX_VR_TEXT_SIZE, or the command does not fit into a single packet frame,
 *              - ERROR_CODE_COMMAND_DISALLOWED if HF and AG do not support features: HFP_(HF/AG)SF_ENHANCED_VOICE_RECOGNITION_STATUS and HFP_(HF/AG)SF_VOICE_RECOGNITION_TEXT
 */
uint8_t hfp_ag_enhanced_voice_recognition_send_message(hci_con_handle_t acl_handle, hfp_voice_recognition_state_t state, hfp_voice_recognition_message_t msg);

/**
 * @brief Send a phone number back to the HF.
 *
 * @param acl_handle
 * @param phone_number
 * @return status ERROR_CODE_SUCCESS if successful, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist
 */
uint8_t hfp_ag_send_phone_number_for_voice_tag(hci_con_handle_t acl_handle, const char * phone_number);

/**
 * @brief Reject sending a phone number to the HF.
 *
 * @param acl_handle
 * @return status ERROR_CODE_SUCCESS if successful, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist
 */
uint8_t hfp_ag_reject_phone_number_for_voice_tag(hci_con_handle_t acl_handle);

/**
 * @brief Store phone number with initiated call.
 * @param type
 * @param number
 */
void hfp_ag_set_clip(uint8_t type, const char * number);


// Cellular Actions

/**
 * @brief Pass the accept incoming call event to the AG.
 */
void hfp_ag_incoming_call(void);

/**
 * @brief Outgoing call initiated
 */
void hfp_ag_outgoing_call_initiated(void);

/**
 * @brief Pass the reject outgoing call event to the AG.
 */
void hfp_ag_outgoing_call_rejected(void);

/**
 * @brief Pass the accept outgoing call event to the AG.
 */
void hfp_ag_outgoing_call_accepted(void);

/**
 * @brief Pass the outgoing call ringing event to the AG.
 */
void hfp_ag_outgoing_call_ringing(void);

/**
 * @brief Pass the outgoing call established event to the AG.
 */
void hfp_ag_outgoing_call_established(void);

/**
 * @brief Pass the call dropped event to the AG.
 */
void hfp_ag_call_dropped(void);

/**
 * @brief Set network registration status.  
 * @param status 0 - not registered, 1 - registered 
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if invalid registration status
 */
uint8_t hfp_ag_set_registration_status(int registration_status);

/**
 * @brief Set network signal strength.
 *
 * @param signal_strength [0-5]
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if invalid signal strength range
 */
uint8_t hfp_ag_set_signal_strength(int signal_strength);

/**
 * @brief Set roaming status.
 *
 * @param roaming_status 0 - no roaming, 1 - roaming active
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if invalid roaming status
 */
uint8_t hfp_ag_set_roaming_status(int roaming_status);

/**
 * @brief Set subscriber number information, e.g. the phone number
 * @param numbers
 * @param numbers_count
 */
void hfp_ag_set_subscriber_number_information(hfp_phone_number_t * numbers, int numbers_count);

/**
 * @brief Called by cellular unit after a DTMF code was transmitted, so that the next one can be emitted.
 *
 * @param acl_handle 
 * @return status ERROR_CODE_SUCCESS if successful, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist
 */
uint8_t hfp_ag_send_dtmf_code_done(hci_con_handle_t acl_handle);

/**
 * @brief Report Extended Audio Gateway Error result codes in the AG.
 * Whenever there is an error relating to the functionality of the AG as a 
 * result of AT command, the AG shall send +CME ERROR:
 * - +CME ERROR: 0  - AG failure
 * - +CME ERROR: 1  - no connection to phone 
 * - +CME ERROR: 3  - operation not allowed 
 * - +CME ERROR: 4  - operation not supported 
 * - +CME ERROR: 5  - PH-SIM PIN required 
 * - +CME ERROR: 10 - SIM not inserted 
 * - +CME ERROR: 11 - SIM PIN required 
 * - +CME ERROR: 12 - SIM PUK required 
 * - +CME ERROR: 13 - SIM failure
 * - +CME ERROR: 14 - SIM busy
 * - +CME ERROR: 16 - incorrect password 
 * - +CME ERROR: 17 - SIM PIN2 required 
 * - +CME ERROR: 18 - SIM PUK2 required 
 * - +CME ERROR: 20 - memory full
 * - +CME ERROR: 21 - invalid index
 * - +CME ERROR: 23 - memory failure
 * - +CME ERROR: 24 - text string too long
 * - +CME ERROR: 25 - invalid characters in text string
 * - +CME ERROR: 26 - dial string too long
 * - +CME ERROR: 27 - invalid characters in dial string
 * - +CME ERROR: 30 - no network service
 * - +CME ERROR: 31 - network Timeout.
 * - +CME ERROR: 32 - network not allowed – Emergency calls only
 *
 * @param acl_handle
 * @param error
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if extended audio gateway error report is disabled
 */
uint8_t hfp_ag_report_extended_audio_gateway_error_result_code(hci_con_handle_t acl_handle, hfp_cme_error_t error);

/**
 * @brief Send unsolicited result code (most likely a response to a vendor-specific command not part of standard HFP).
 * @note  Emits HFP_SUBEVENT_CUSTOM_AT_MESSAGE_SENT when result code was sent
 *
 * @param unsolicited_result_code to send
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if extended audio gateway error report is disabled
 */
uint8_t hfp_ag_send_unsolicited_result_code(hci_con_handle_t acl_handle, const char * unsolicited_result_code);

/**
 * @brief Send result code for AT command received via HFP_SUBEVENT_CUSTOM_AT_COMMAND
 * @note  Emits HFP_SUBEVENT_COMPLETE when result code was sent
 *
 * @param ok for OK, or ERROR
 * @return status ERROR_CODE_SUCCESS if successful, otherwise:
 *              - ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER if connection does not exist, or
 *              - ERROR_CODE_COMMAND_DISALLOWED if extended audio gateway error report is disabled
 */
uint8_t hfp_ag_send_command_result_code(hci_con_handle_t acl_handle, bool ok);

/**
 * @brief De-Init HFP AG
 */
void hfp_ag_deinit(void);

/**
 * @brief Create HFP Audio Gateway (AG) SDP service record.
 * @deprecated Use hfp_ag_create_sdp_record_with_codecs instead
 * @param service
 * @param rfcomm_channel_nr
 * @param name
 * @param ability_to_reject_call
 * @param supported_features 32-bit bitmap, see HFP_AGSF_* values in hfp.h
 * @param wide_band_speech supported
 */
void hfp_ag_create_sdp_record(uint8_t * service, uint32_t service_record_handle, int rfcomm_channel_nr, const char * name, uint8_t ability_to_reject_call, uint16_t supported_features, int wide_band_speech);

/* API_END */

// testing
hfp_ag_indicator_t * hfp_ag_get_ag_indicators(hfp_connection_t * hfp_connection);

// @return true to process even as normal, false to cause HFP AG to ignore event
void hfp_ag_register_custom_call_sm_handler(bool (*handler)(hfp_ag_call_event_t event));

#ifdef ENABLE_TESTING_SUPPORT
bool test_hfp_ag_vra_state_machine(hfp_connection_t * hfp_connection, hfp_ag_vra_event_type_t event);
#endif

#if defined __cplusplus
}
#endif

#endif
