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/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * 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.
 */

#include "mbed.h"
#include "BLEDevice.h"

BLEDevice  ble;
DigitalOut led1(LED1);

#define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console;
                               * it will have an impact on code-size and power consumption. */

#if NEED_CONSOLE_OUTPUT
Serial  pc(USBTX, USBRX);
#define DEBUG(...) { pc.printf(__VA_ARGS__); }
#else
#define DEBUG(...) /* nothing */
#endif /* #if NEED_CONSOLE_OUTPUT */

const static char  DEVICE_NAME[] = "Keewi_v1";

/* Heart Rate Service */
/* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.cycling_speed_and_cadence.xml*/
/* CSC Mes: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.csc_measurement.xml */
/* Feature: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.csc_feature.xml */
/* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.sensor_location.xml */
/* Control point: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.sc_control_point.xml */
static uint16_t cscCumulativeWheelRevolutions = 0;
static uint16_t cscLastWheelEventTime = 0;          // Unit is second & has a resolution of 1/1024s. 
static uint16_t cscCumulativeCrankRevolutions = 0;
static uint16_t cscLastCrankEventTime = 0;          // Unit is second & has a resolution of 1/1024s.

static bool cscWheelRevolutionDataSupported = true;
static bool cscWCrankRevolutionDataSupported = true;
static bool cscMultipleSensorLocationsSupported = true;

static uint8_t csc_mes[4] = {cscCumulativeWheelRevolutions, cscLastWheelEventTime, cscCumulativeCrankRevolutions, cscLastCrankEventTime};
static uint8_t csc_feat[3] = {cscWheelRevolutionDataSupported, cscWCrankRevolutionDataSupported, cscMultipleSensorLocationsSupported};
GattCharacteristic cscMeasurement(GattCharacteristic::UUID_CSC_MEASUREMENT_CHAR, csc_mes, sizeof(csc_mes), sizeof(csc_mes),
                           GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
static const uint8_t location = 0x09; /* Front Hub */
GattCharacteristic cscMesLocation(GattCharacteristic::UUID_CSC_MEASUREMENT_CHAR,
                               (uint8_t *)&location, sizeof(location), sizeof(location),
                               GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
GattCharacteristic *cscChars[] = {&cscMeasurement, &cscMesLocation, };
GattService        cscService(GattService::UUID_CYCLING_SPEED_AND_CADENCE, cscChars, sizeof(cscChars) / sizeof(GattCharacteristic *));

static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE};

void disconnectionCallback(void)
{
    DEBUG("Disconnected!\n\r");
    DEBUG("Restarting the advertising process\n\r");
    ble.startAdvertising();
}

/**
 * Triggered periodically by the 'ticker' interrupt; updates hrmCounter.
 */
void periodicCallback(void)
{
    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */

    if (ble.getGapState().connected) {
        /* Update the HRM measurement */
        /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
        /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
        cscCumulativeWheelRevolutions+=3;
        cscCumulativeCrankRevolutions++;

        csc_mes[1] = cscCumulativeWheelRevolutions;
        csc_mes[3] = cscCumulativeCrankRevolutions;
        ble.updateCharacteristicValue(cscMeasurement.getHandle(), csc_mes, sizeof(csc_mes));
    }
}

int main(void)
{
    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1);

    DEBUG("Initialising the nRF51822\n\r");
    ble.init();
    ble.onDisconnection(disconnectionCallback);

    /* setup advertising */
    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t*)uuid16_list, sizeof(uuid16_list));
    ble.accumulateAdvertisingPayload(GapAdvertisingData::CYCLING_SPEED_AND_CADENCE_SENSOR);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
    ble.startAdvertising();

    ble.addService(cscService);

    while (true) {
        ble.waitForEvent();
    }
}