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/* mbed Microcontroller Library
 * Copyright (c) 2006-2014 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 <events/mbed_events.h>
#include <mbed.h>
#include "ble/BLE.h"
#include "ble/Gap.h"
#include "pretty_printer.h"

static DigitalOut led1(LED1, 1);

const static char DEVICE_NAME[] = "STEP COUNTER";

const static uint16_t STEP_COUNTER_SERVICE_UUID = 0xA000;
const static uint16_t STEP_COUNTER_CHARACTERISTIC_UUID = 0xA001;

int step_count = 0;
int id = 0;
ReadWriteGattCharacteristic<int> step_count_state(STEP_COUNTER_CHARACTERISTIC_UUID, &step_count, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);

static events::EventQueue event_queue(/* event count */ 16 * EVENTS_EVENT_SIZE);

class StepCounter : ble::Gap::EventHandler {
public:
    StepCounter(BLE &ble, events::EventQueue &event_queue) :
        _ble(ble),
        _event_queue(event_queue),
        _step_counter_uuid(STEP_COUNTER_SERVICE_UUID),
        _adv_data_builder(_adv_buffer) { }

    void start() {
        _ble.gap().setEventHandler(this);

        _ble.init(this, &StepCounter::on_init_complete);
        _event_queue.call_every(500, this, &StepCounter::blink);
        _event_queue.call_every(1000, this, &StepCounter::update_step_count);

        _event_queue.dispatch_forever();
    }

private:
    /** Callback triggered when the ble initialization process has finished */
    void on_init_complete(BLE::InitializationCompleteCallbackContext *params) {
        if (params->error != BLE_ERROR_NONE) {
            print_error(params->error, "Ble initialization failed.");
            return;
        }
        
        _ble.gattServer().onDataWritten(this, &StepCounter::on_data_written);

        print_mac_address();

        start_advertising();
    }

    void start_advertising() {
        /* Create advertising parameters and payload */

        ble::AdvertisingParameters adv_parameters(
            ble::advertising_type_t::CONNECTABLE_UNDIRECTED,
            ble::adv_interval_t(ble::millisecond_t(1000))
        );

        _adv_data_builder.setFlags();
        _adv_data_builder.setLocalServiceList(mbed::make_Span(&_step_counter_uuid, 1));
        _adv_data_builder.setName(DEVICE_NAME);

        /* Setup advertising */

        ble_error_t error = _ble.gap().setAdvertisingParameters(
            ble::LEGACY_ADVERTISING_HANDLE,
            adv_parameters
        );

        if (error) {
            print_error(error, "_ble.gap().setAdvertisingParameters() failed");
            return;
        }

        error = _ble.gap().setAdvertisingPayload(
            ble::LEGACY_ADVERTISING_HANDLE,
            _adv_data_builder.getAdvertisingData()
        );

        if (error) {
            print_error(error, "_ble.gap().setAdvertisingPayload() failed");
            return;
        }

        /* Start advertising */

        error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);

        if (error) {
            print_error(error, "_ble.gap().startAdvertising() failed");
            return;
        }
    }
    
    void on_data_written(const GattWriteCallbackParams *params) {
        if ((params->handle == step_count_state.getValueHandle()) && (params->len == 1)) {
            step_count = *(params->data);
        }
        step_count = 0;
    }

    void update_step_count() {
        if (_ble.gap().getState().connected) {
            step_count++;

            _ble.gattServer().write(step_count_state.getValueHandle(), (uint8_t *)&step_count, sizeof(int));
        }
    }

    void blink(void) {
        led1 = !led1;
    }

private:
    /* Event handler */

    void onDisconnectionComplete(const ble::DisconnectionCompleteEvent&) {
        _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
    }

private:
    BLE &_ble;
    events::EventQueue &_event_queue;
    
    UUID _step_counter_uuid;

    uint8_t _adv_buffer[ble::LEGACY_ADVERTISING_MAX_SIZE];
    ble::AdvertisingDataBuilder _adv_data_builder;
};

/** Schedule processing of events from the BLE middleware in the event queue. */
void schedule_ble_events(BLE::OnEventsToProcessCallbackContext *context) {
    event_queue.call(Callback<void()>(&context->ble, &BLE::processEvents));
}

int main()
{
    BLE &ble = BLE::Instance();
    
    GattCharacteristic *charTable[] = {&step_count_state};
    GattService step_count_service(STEP_COUNTER_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
    ble.addService(step_count_service);
    
    ble.onEventsToProcess(schedule_ble_events);

    StepCounter demo(ble, event_queue);
    demo.start();

    return 0;
}