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#include <Adafruit_Fingerprint.h>

/***************************************************
  This is a library for our optical Fingerprint sensor

  Designed specifically to work with the Adafruit Fingerprint sensor
  ----> http://www.adafruit.com/products/751

  These displays use TTL Serial to communicate, 2 pins are required to
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include "Adafruit_Fingerprint.h"
#if defined(__AVR__) || defined(ESP8266)
#include <SoftwareSerial.h>
#endif

//#define FINGERPRINT_DEBUG

#if ARDUINO >= 100
#define SERIAL_WRITE(...) mySerial->write(__VA_ARGS__)
#else
#define SERIAL_WRITE(...) mySerial->write(__VA_ARGS__, BYTE)
#endif

#define SERIAL_WRITE_U16(v) SERIAL_WRITE((uint8_t)(v>>8)); SERIAL_WRITE((uint8_t)(v & 0xFF));

#define GET_CMD_PACKET(...) \
  uint8_t data[] = {__VA_ARGS__}; \
  Adafruit_Fingerprint_Packet packet(FINGERPRINT_COMMANDPACKET, sizeof(data), data); \
  writeStructuredPacket(packet); \
  if (getStructuredPacket(&packet) != FINGERPRINT_OK) return FINGERPRINT_PACKETRECIEVEERR; \
  if (packet.type != FINGERPRINT_ACKPACKET) return FINGERPRINT_PACKETRECIEVEERR;

#define SEND_CMD_PACKET(...) GET_CMD_PACKET(__VA_ARGS__); return packet.data[0];

/***************************************************************************
  PUBLIC FUNCTIONS
 ***************************************************************************/


#if defined(__AVR__) || defined(ESP8266)
/**************************************************************************/
/*!
    @brief  Instantiates sensor with Software Serial
    @param  ss Pointer to SoftwareSerial object
    @param  password 32-bit integer password (default is 0)
*/
/**************************************************************************/
Adafruit_Fingerprint::Adafruit_Fingerprint(SoftwareSerial *ss, uint32_t password) {
  thePassword = password;
  theAddress = 0xFFFFFFFF;

  hwSerial = NULL;
  swSerial = ss;
  mySerial = swSerial;
}
#endif

/**************************************************************************/
/*!
    @brief  Instantiates sensor with Hardware Serial
    @param  hs Pointer to HardwareSerial object
    @param  password 32-bit integer password (default is 0)

*/
/**************************************************************************/
Adafruit_Fingerprint::Adafruit_Fingerprint(HardwareSerial *hs, uint32_t password) {
  thePassword = password;
  theAddress = 0xFFFFFFFF;

#if defined(__AVR__) || defined(ESP8266)
  swSerial = NULL;
#endif
  hwSerial = hs;
  mySerial = hwSerial;
}

/**************************************************************************/
/*!
    @brief  Initializes serial interface and baud rate
    @param  baudrate Sensor's UART baud rate (usually 57600, 9600 or 115200)
*/
/**************************************************************************/
void Adafruit_Fingerprint::begin(uint32_t baudrate) {
  delay(1000);  // one second delay to let the sensor 'boot up'

  if (hwSerial) hwSerial->begin(baudrate);
#if defined(__AVR__) || defined(ESP8266)
  if (swSerial) swSerial->begin(baudrate);
#endif
}

/**************************************************************************/
/*!
    @brief  Verifies the sensors' access password (default password is 0x0000000). A good way to also check if the sensors is active and responding
    @returns True if password is correct
*/
/**************************************************************************/
boolean Adafruit_Fingerprint::verifyPassword(void) {
  return checkPassword() == FINGERPRINT_OK;
}

uint8_t Adafruit_Fingerprint::checkPassword(void) {
  GET_CMD_PACKET(FINGERPRINT_VERIFYPASSWORD,
                 (uint8_t)(thePassword >> 24), (uint8_t)(thePassword >> 16),
                 (uint8_t)(thePassword >> 8), (uint8_t)(thePassword & 0xFF));
  if (packet.data[0] == FINGERPRINT_OK)
    return FINGERPRINT_OK;
  else
    return FINGERPRINT_PACKETRECIEVEERR;
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to take an image of the finger pressed on surface
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_NOFINGER</code> if no finger detected
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
    @returns <code>FINGERPRINT_IMAGEFAIL</code> on imaging error
*/
/**************************************************************************/
uint8_t Adafruit_Fingerprint::getImage(void) {
  SEND_CMD_PACKET(FINGERPRINT_GETIMAGE);
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to convert image to feature template
    @param slot Location to place feature template (put one in 1 and another in 2 for verification to create model)
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_IMAGEMESS</code> if image is too messy
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
    @returns <code>FINGERPRINT_FEATUREFAIL</code> on failure to identify fingerprint features
    @returns <code>FINGERPRINT_INVALIDIMAGE</code> on failure to identify fingerprint features
*/
uint8_t Adafruit_Fingerprint::image2Tz(uint8_t slot) {
  SEND_CMD_PACKET(FINGERPRINT_IMAGE2TZ, slot);
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to take two print feature template and create a model
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
    @returns <code>FINGERPRINT_ENROLLMISMATCH</code> on mismatch of fingerprints
*/
uint8_t Adafruit_Fingerprint::createModel(void) {
  SEND_CMD_PACKET(FINGERPRINT_REGMODEL);
}


/**************************************************************************/
/*!
    @brief   Ask the sensor to store the calculated model for later matching
    @param   location The model location #
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_BADLOCATION</code> if the location is invalid
    @returns <code>FINGERPRINT_FLASHERR</code> if the model couldn't be written to flash memory
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
uint8_t Adafruit_Fingerprint::storeModel(uint16_t location) {
  SEND_CMD_PACKET(FINGERPRINT_STORE, 0x01, (uint8_t)(location >> 8), (uint8_t)(location & 0xFF));
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to load a fingerprint model from flash into buffer 1
    @param   location The model location #
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_BADLOCATION</code> if the location is invalid
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
uint8_t Adafruit_Fingerprint::loadModel(uint16_t location) {
  SEND_CMD_PACKET(FINGERPRINT_LOAD, 0x01, (uint8_t)(location >> 8), (uint8_t)(location & 0xFF));
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to transfer 256-byte fingerprint template from the buffer to the UART
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
uint8_t Adafruit_Fingerprint::getModel(void) {
  SEND_CMD_PACKET(FINGERPRINT_UPLOAD, 0x01);
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to delete a model in memory
    @param   location The model location #
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_BADLOCATION</code> if the location is invalid
    @returns <code>FINGERPRINT_FLASHERR</code> if the model couldn't be written to flash memory
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
uint8_t Adafruit_Fingerprint::deleteModel(uint16_t location) {
  SEND_CMD_PACKET(FINGERPRINT_DELETE, (uint8_t)(location >> 8), (uint8_t)(location & 0xFF), 0x00, 0x01);
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to delete ALL models in memory
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_BADLOCATION</code> if the location is invalid
    @returns <code>FINGERPRINT_FLASHERR</code> if the model couldn't be written to flash memory
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
uint8_t Adafruit_Fingerprint::emptyDatabase(void) {
  SEND_CMD_PACKET(FINGERPRINT_EMPTY);
}

/**************************************************************************/
/*!
    @brief   Ask the sensor to search the current slot 1 fingerprint features to match saved templates. The matching location is stored in <b>fingerID</b> and the matching confidence in <b>confidence</b>
    @returns <code>FINGERPRINT_OK</code> on fingerprint match success
    @returns <code>FINGERPRINT_NOTFOUND</code> no match made
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
/**************************************************************************/
uint8_t Adafruit_Fingerprint::fingerFastSearch(void) {
  // high speed search of slot #1 starting at page 0x0000 and page #0x00A3
  GET_CMD_PACKET(FINGERPRINT_HISPEEDSEARCH, 0x01, 0x00, 0x00, 0x00, 0xA3);
  fingerID = 0xFFFF;
  confidence = 0xFFFF;

  fingerID = packet.data[1];
  fingerID <<= 8;
  fingerID |= packet.data[2];

  confidence = packet.data[3];
  confidence <<= 8;
  confidence |= packet.data[4];

  return packet.data[0];
}

/**************************************************************************/
/*!
    @brief   Ask the sensor for the number of templates stored in memory. The number is stored in <b>templateCount</b> on success.
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
/**************************************************************************/
uint8_t Adafruit_Fingerprint::getTemplateCount(void) {
  GET_CMD_PACKET(FINGERPRINT_TEMPLATECOUNT);

  templateCount = packet.data[1];
  templateCount <<= 8;
  templateCount |= packet.data[2];

  return packet.data[0];
}

/**************************************************************************/
/*!
    @brief   Set the password on the sensor (future communication will require password verification so don't forget it!!!)
    @param   password 32-bit password code
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_PACKETRECIEVEERR</code> on communication error
*/
/**************************************************************************/
uint8_t Adafruit_Fingerprint::setPassword(uint32_t password) {
  SEND_CMD_PACKET(FINGERPRINT_SETPASSWORD, (password >> 24), (password >> 16), (password >> 8), password);
}

/**************************************************************************/
/*!
    @brief   Helper function to process a packet and send it over UART to the sensor
    @param   packet A structure containing the bytes to transmit
*/
/**************************************************************************/

void Adafruit_Fingerprint::writeStructuredPacket(const Adafruit_Fingerprint_Packet & packet) {
  SERIAL_WRITE_U16(packet.start_code);
  SERIAL_WRITE(packet.address[0]);
  SERIAL_WRITE(packet.address[1]);
  SERIAL_WRITE(packet.address[2]);
  SERIAL_WRITE(packet.address[3]);
  SERIAL_WRITE(packet.type);

  uint16_t wire_length = packet.length + 2;
  SERIAL_WRITE_U16(wire_length);

  uint16_t sum = ((wire_length) >> 8) + ((wire_length) & 0xFF) + packet.type;
  for (uint8_t i = 0; i < packet.length; i++) {
    SERIAL_WRITE(packet.data[i]);
    sum += packet.data[i];
  }

  SERIAL_WRITE_U16(sum);
  return;
}

/**************************************************************************/
/*!
    @brief   Helper function to receive data over UART from the sensor and process it into a packet
    @param   packet A structure containing the bytes received
    @param   timeout how many milliseconds we're willing to wait
    @returns <code>FINGERPRINT_OK</code> on success
    @returns <code>FINGERPRINT_TIMEOUT</code> or <code>FINGERPRINT_BADPACKET</code> on failure
*/
/**************************************************************************/
uint8_t Adafruit_Fingerprint::getStructuredPacket(Adafruit_Fingerprint_Packet * packet, uint16_t timeout) {
  uint8_t byte;
  uint16_t idx = 0, timer = 0;

  while (true) {
    while (!mySerial->available()) {
      delay(1);
      timer++;
      if ( timer >= timeout) {
#ifdef FINGERPRINT_DEBUG
        Serial.println("Timed out");
#endif
        return FINGERPRINT_TIMEOUT;
      }
    }
    byte = mySerial->read();
#ifdef FINGERPRINT_DEBUG
    Serial.print("<- 0x"); Serial.println(byte, HEX);
#endif
    switch (idx) {
      case 0:
        if (byte != (FINGERPRINT_STARTCODE >> 8))
          continue;
        packet->start_code = (uint16_t)byte << 8;
        break;
      case 1:
        packet->start_code |= byte;
        if (packet->start_code != FINGERPRINT_STARTCODE)
          return FINGERPRINT_BADPACKET;
        break;
      case 2:
      case 3:
      case 4:
      case 5:
        packet->address[idx - 2] = byte;
        break;
      case 6:
        packet->type = byte;
        break;
      case 7:
        packet->length = (uint16_t)byte << 8;
        break;
      case 8:
        packet->length |= byte;
        break;
      default:
        packet->data[idx - 9] = byte;
        if ((idx - 8) == packet->length)
          return FINGERPRINT_OK;
        break;
    }
    idx++;
  }
  // Shouldn't get here so...
  return FINGERPRINT_BADPACKET;
}