/**
 * A BLE client example that is rich in capabilities.
 */

#include "BLEDevice.h"


// The remote service we wish to connect to.
static BLEUUID serviceUUID("00001204-0000-1000-8000-00805f9b34fb");

// The characteristic of the remote service we are interested in.
static BLEUUID     charUUID("00001a00-0000-1000-8000-00805f9b34fb");
static BLEUUID    charUUID2("00001a01-0000-1000-8000-00805f9b34fb");
static BLEUUID    charUUID3("00001a02-0000-1000-8000-00805f9b34fb");

static BLEAddress *pServerAddress;
static BLERemoteCharacteristic* pRemoteCharacteristic, *pRC;

static boolean doConnect = false;
static boolean connected = false;

BLERemoteService* pRemoteService;
BLEClient*  pClient;

static void notifyCallback(
  BLERemoteCharacteristic* pBLERemoteCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify) {
    Serial.print("Notify callback for characteristic ");
    Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
    Serial.print(" of data length ");
    Serial.println(length);
}


bool connectToServer(BLEAddress pAddress) {
    Serial.print(millis());
    Serial.print(" - Forming a connection to ");
    Serial.println(pAddress.toString().c_str());

    pClient  = BLEDevice::createClient();
    Serial.print(millis());
    Serial.println(" - Created client");

    // Connect to the remote BLE Server.
    pClient->connect(pAddress);
    Serial.print(millis());
    Serial.println(" - Connected to server");

    // Obtain a reference to the service we are after in the remote BLE server.
    pRemoteService = pClient->getService(serviceUUID);
    if (pRemoteService == nullptr) {
        Serial.print("Failed to find our service UUID: ");
        Serial.println(serviceUUID.toString().c_str());
        for(;;);
    }
    Serial.print(millis());
    Serial.println(" - Found our service");

    // Obtain a reference to the control characteristic in the service of the remote BLE server.
    pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
    if (pRemoteCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(charUUID.toString().c_str());
      for(;;);
    }

    Serial.print(millis());
    Serial.println(" - Setting control characteristic value to 0xA01F");
    byte newValue[] = {0xA0, 0x1F};

    // Set the characteristic's value to be the array of bytes.
    pRemoteCharacteristic->writeValue(newValue, 2); // Enable real-time reporting

    // Read the value of the sensor characteristic.
    std::string value = pRemoteCharacteristic->readValue();
    delay(100);
    Serial.print(millis());
    Serial.print(" - The characteristic value was: ");
    for (int i=0; i<value.length(); i++) {
      Serial.print((byte)value[i]);
      Serial.print(" ");
    }
    Serial.println();
    return true;
}

/**
 * Scan for BLE servers and find the first one named "Flower care"
 */
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
 /**
   * Called for each advertising BLE server.
   */
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    Serial.print(millis());
    Serial.print(" - BLE Advertised Device found: ");
    Serial.println(advertisedDevice.toString().c_str());

    // We have found a device, let us now see if it contains the service we are looking for.

    if (advertisedDevice.getName() == "Flower care") {
      Serial.print(millis());
      Serial.print(" - Found our device!  address: ");
      advertisedDevice.getScan()->stop();

      pServerAddress = new BLEAddress(advertisedDevice.getAddress());
      doConnect = true;
    } // Found our server
  } // onResult
}; // MyAdvertisedDeviceCallbacks


void setup() {
  Serial.begin(115200);
    Serial.print(millis());
  Serial.println(" - Starting Arduino BLE Client application...");
  BLEDevice::init("");
  // Retrieve a Scanner and set the callback we want to use to be informed when we
  // have detected a new device.  Specify that we want active scanning and start the
  // scan to run for 30 seconds.
  BLEScan* pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true);
  pBLEScan->start(30);
} // End of setup.


// This is the Arduino main loop function.
void loop() {

  // If the flag "doConnect" is true then we have scanned for and found the desired
  // BLE Server with which we wish to connect.  Now we connect to it.  Once we are
  // connected we set the connected flag to be true.
  if (doConnect == true) {
    if (connectToServer(*pServerAddress)) {
      Serial.print(millis());
      Serial.println(" - We are now connected to the BLE Server.");
      connected = true;
    } else {
      Serial.println("We have failed to connect to the server; there is nothin more we will do.");
    }
    doConnect = false;
  }


  // If we are connected to a peer BLE Server, update the characteristic to enable real-time reads

  if (connected) {

    // Obtain a reference to the sensor characteristic in the service of the remote BLE server.
    pRC = pRemoteService->getCharacteristic(charUUID2);
    if (pRC == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(charUUID2.toString().c_str());
      for(;;);
    }
    Serial.print(millis());
    Serial.println(" - Found sensor characteristic");

 // Read the value of the sensor characteristic.
    std::string value = pRC->readValue();
    delay(100);
    Serial.print(millis());
    Serial.print(" - The characteristic value was: ");
    for (int i=0; i<value.length(); i++) {
      Serial.print((byte)value[i]);
      Serial.print(" ");
    }
    Serial.println();


    // Find the battery characteristic
    pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID3);
    if (pRemoteCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(charUUID3.toString().c_str());
      for(;;);
    }
    delay(100);
    Serial.print(millis());
    Serial.println(" - Found our battery/firmware characteristic");

    // Read the value of the characteristic.
    value = pRemoteCharacteristic->readValue();
    Serial.print(millis());
    Serial.print(" - The characteristic value was: ");
      Serial.print("Battery ");
      Serial.print((byte)value[0]);
      Serial.print("% Firmware ");
      Serial.print(String(value.substr(2,5).c_str()));
    Serial.println();
  for(;;)
    delay(1000);
  }

  delay(1000); // Delay a second between loops.
} // End of loop