/*
 * Copyright (C) 2014 BlueKitchen GmbH
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 *
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 * 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
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 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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#define __BTSTACK_FILE__ "le_counter.c"

// *****************************************************************************
/* EXAMPLE_START(le_counter): LE Peripheral - Heartbeat Counter over GATT
 *
 * @text All newer operating systems provide GATT Client functionality.
 * The LE Counter examples demonstrates how to specify a minimal GATT Database
 * with a custom GATT Service and a custom Characteristic that sends periodic
 * notifications. 
 */
 // *****************************************************************************

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "hrp_server_test.h"
#include "btstack.h"
#include "ble/gatt-service/heart_rate_service_server.h"

#define HEARTBEAT_PERIOD_MS 1000

static int  le_notification_enabled;
static btstack_timer_source_t heartbeat;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static hci_con_handle_t con_handle;

static uint16_t heart_rate = 100;
static heart_rate_service_sensor_contact_status_t contact;
static uint16_t energy_expended;
static int rr_interval_count;
static uint16_t rr_intervals[10];

static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static uint16_t att_read_callback(hci_con_handle_t con_handle, uint16_t att_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size);
static int att_write_callback(hci_con_handle_t con_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size);
static void  heartbeat_handler(struct btstack_timer_source *ts);
static void beat(void);

const uint8_t adv_data[] = {
    // Flags general discoverable, BR/EDR not supported
    0x02, 0x01, 0x06, 
    // Name
    0x12, 0x09, 'H', 'e', 'a', 'r', 't', ' ', 'R', 'a', 't', 'e', ' ', 'S', 'e', 'r', 'v', 'e','r'
};
const uint8_t adv_data_len = sizeof(adv_data);


static int  counter = 0;
static char counter_string[30];
static int  counter_string_len;

static void beat(void){
    counter++;
    counter_string_len = sprintf(counter_string, "BTstack counter %04u", counter);
    puts(counter_string);
}

static void heartbeat_handler(struct btstack_timer_source *ts){
    if (le_notification_enabled) {
        beat();
        att_server_request_can_send_now_event(con_handle);
    }

    // simulate increase of energy spent 
    if (energy_expended < 0xFFFF) {
        energy_expended++;
    }

    heart_rate_service_server_update_heart_rate_values(heart_rate, HEART_RATE_SERVICE_SENSOR_CONTACT_HAVE_CONTACT, rr_interval_count, &rr_intervals[0]);

    btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS);
    btstack_run_loop_add_timer(ts);
} 

static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    UNUSED(channel);
    UNUSED(size);

    switch (packet_type) {
        case HCI_EVENT_PACKET:
            switch (hci_event_packet_get_type(packet)) {
                case HCI_EVENT_DISCONNECTION_COMPLETE:
                    le_notification_enabled = 0;
                    break;
                case ATT_EVENT_CAN_SEND_NOW:
                    break;
            }
            break;
    }
}

static uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
    UNUSED(connection_handle);

    return 0;
}

static int att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){
    UNUSED(transaction_mode);
    UNUSED(offset);
    UNUSED(buffer_size);
    
    return 0;
}


int btstack_main(void);
int btstack_main(void){
    // register for HCI events
    hci_event_callback_registration.callback = &packet_handler;
    hci_add_event_handler(&hci_event_callback_registration);

    l2cap_init();

    // setup le device db
    le_device_db_init();

    // setup SM: Display only
    sm_init();

    // setup ATT server
    att_server_init(profile_data, att_read_callback, att_write_callback);    
    att_server_register_packet_handler(packet_handler);

    // setup battery service
    heart_rate_service_server_init(HEART_RATE_SERVICE_BODY_SENSOR_LOCATION_HAND);

    // setup advertisements
    uint16_t adv_int_min = 0x0030;
    uint16_t adv_int_max = 0x0030;
    uint8_t adv_type = 0;
    bd_addr_t null_addr;
    memset(null_addr, 0, 6);
    gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00);
    gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data);
    gap_advertisements_enable(1);

    // set one-shot timer
    heartbeat.process = &heartbeat_handler;
    btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
    btstack_run_loop_add_timer(&heartbeat);

    // beat once
    beat();

    // turn on!
	hci_power_control(HCI_POWER_ON);
	    
    return 0;
}
/* EXAMPLE_END */