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/*
   ATTiny PB3=Eingang RFID
   ATTiny PB1=Ausgang Relais
   ATTiny PB0=Ausgang LED

   ProgrammMode = LED AN
   Slave1 programmiert 1xBlinken  (Freq 1Sek)
   Slave2 programmiert 2xBlinken  (Freq 1Sek)
   Slave3 programmiert 3xBlinken  (Freq 1Sek)
   Speicher voll: 3xBlinken       (Freq 300ms)
   Zwei Ausgänge sind über, eventuell OLED als Anzeige
   Aktueller Stromverbrauch gemessen mit Multimeter Metex M3900: 0,040 A
   Ohne Sleepfunktion
*/
#include <EEPROM.h>
#include "ReceiveOnlySoftwareSerial.h"

ReceiveOnlySoftwareSerial RFID = ReceiveOnlySoftwareSerial(PB3);
byte buffer[100];
byte RFID_Master[10] = {'0', '2', '0', '0', '6', 'E', '2', 'F', 'E', '0'}; //the master RFID fob (key) to look for
byte RFID_Slave1[10], RFID_Slave2[10], RFID_Slave3[10];
byte i;
byte i2;
byte checkPosition;
boolean RFID_Master_Correct;
boolean RFID_Slave1_Correct, RFID_Slave2_Correct, RFID_Slave3_Correct;
boolean RFID_SaveNextRead;
const int PIN_RELAIS = 1;
const int PIN_LED = 0;

void setup() {
  RFID.begin(9600);
  pinMode(PIN_RELAIS, OUTPUT);
  pinMode(PIN_LED, OUTPUT);
  digitalWrite(PIN_RELAIS, LOW);
  digitalWrite(PIN_LED, LOW);
  EEPROM_Read_Slaves(); //Varible used to read EEPROM
  i = 1; //sets the varible to 1, and thereby skip the start byte (0x0A)
}
void loop() { //the main loop
  // Seriel data
  while (RFID.available() > 0) { //check if the RFID reader sends anything
    //    Serial.println(buffer[0]);
    if (buffer[0] != 2) { //check if it the start bit is 0x0A
      buffer[0] = RFID.read(); //write bit to buffer
    } else {
      //Modtag
      buffer[i] = RFID.read(); //write next bit to buffer
      if (buffer[i] == 3) {   //if end bit is send, disable the RFID reader temporary

        RFID.end();
        RFID_Master_Correct = true;
        RFID_Slave1_Correct = true;
        RFID_Slave2_Correct = true;
        RFID_Slave3_Correct = true;

        //RFID
        // We have read all bytes - we are now going to check them
        for (checkPosition = 0; checkPosition < 10; checkPosition++) {
          if (buffer[checkPosition + 1] == RFID_Slave1[checkPosition] && RFID_Slave1_Correct == true) { // compares the written bits to "RFID1"
            RFID_Slave1_Correct = true; //Slave1 RFID tag is detected
          } else {
            RFID_Slave1_Correct = false; //Slave1 RFID tag is not detected
          }
          if (buffer[checkPosition + 1] == RFID_Slave2[checkPosition] && RFID_Slave2_Correct == true) { // compares the written bits to "RFID2"
            RFID_Slave2_Correct = true; //Slave2 RFID tag is detected
          } else {
            RFID_Slave2_Correct = false; //Slave2 RFID tag is not detected
          }
          if (buffer[checkPosition + 1] == RFID_Slave3[checkPosition] && RFID_Slave3_Correct == true) { // compares the written bits to "RFID3"
            RFID_Slave3_Correct = true; //Slave3 RFID tag is detected
          } else {
            RFID_Slave3_Correct = false; //Slave3 RFID tag is detected
          }
          //Master
          if (buffer[checkPosition + 1] == RFID_Master[checkPosition] && RFID_Master_Correct == true) { // compares the written bits to "Master"
            RFID_Master_Correct = true; //Master RFID tag is detected
          } else {
            RFID_Master_Correct = false; //Master RFID tag is detected
          }
        }

        if (RFID_SaveNextRead == false && (RFID_Slave1_Correct == true || RFID_Slave2_Correct == true || RFID_Slave3_Correct == true) && RFID_Master_Correct == false) { //see if the right RFID fob (key) is detected
          digitalWrite(PIN_RELAIS, HIGH);
          delay(1000);
          digitalWrite(PIN_RELAIS, LOW);
          delay(1000); // Wait for you to remove the RFID fob (key)
        } else if (RFID_Master_Correct == true && RFID_SaveNextRead == false) { // If the Master Card is scanned when not in programming mode
          delay(1000);
          RFID_SaveNextRead = true;  // Enable programming mode
          digitalWrite(PIN_LED, HIGH); // PROGRAMM MODE
        } else if (RFID_Master_Correct == false && RFID_SaveNextRead == true) { // If another card is scanned when in programming mode
          // Save the Card
          if (RFID_Slave1[0] == 0) { // Is the Slave1 Card slot empty?
            for (checkPosition = 0; checkPosition < 10; checkPosition++) { //Read bit fra 0-9
              RFID_Slave1[checkPosition] = buffer[checkPosition + 1]; // Save the scanned card as Slave1
            }
            digitalWrite(PIN_LED, LOW);
            delay(1000);
            digitalWrite(PIN_LED, HIGH);
            delay(1000);
            digitalWrite(PIN_LED, LOW);
            delay(1000);
          } else if (RFID_Slave2[0] == 0) { // Is the Slave2 Card slot empty?
            for (checkPosition = 0; checkPosition < 10; checkPosition++) { //Read bit fra 0-9
              RFID_Slave2[checkPosition] = buffer[checkPosition + 1]; // Save the scanned card as Slave2
            }
            digitalWrite(PIN_LED, LOW);
            delay(1000);
            digitalWrite(PIN_LED, HIGH);
            delay(1000);
            digitalWrite(PIN_LED, LOW);
            delay(1000);
            digitalWrite(PIN_LED, HIGH);
            delay(1000);
            digitalWrite(PIN_LED, LOW);
            delay(1000);
          } else if (RFID_Slave3[0] == 0) { // Is the Slave3 Card slot empty?
            for (checkPosition = 0; checkPosition < 10; checkPosition++) { //Read bit fra 0-9
              RFID_Slave3[checkPosition] = buffer[checkPosition + 1]; // Save the scanned card as Slave3
            }
            digitalWrite(PIN_LED, LOW);
            delay(1000);
            digitalWrite(PIN_LED, HIGH);
            delay(1000);
            digitalWrite(PIN_LED, LOW);
            delay(1000);
            digitalWrite(PIN_LED, HIGH);
            delay(1000);
            digitalWrite(PIN_LED, LOW);
            delay(1000);
            digitalWrite(PIN_LED, HIGH);
            delay(1000);
            digitalWrite(PIN_LED, LOW);
            delay(1000);
          } else {
            digitalWrite(PIN_LED, LOW);
            delay(300);
            digitalWrite(PIN_LED, HIGH);
            delay(300);
            digitalWrite(PIN_LED, LOW);
            delay(300);
            digitalWrite(PIN_LED, HIGH);
            delay(300);
            digitalWrite(PIN_LED, LOW);
            delay(300);
            digitalWrite(PIN_LED, HIGH);
            delay(300);
            digitalWrite(PIN_LED, LOW);
          }
          EEPROM_Save_Slaves();
          RFID_SaveNextRead = false;
          //Master
        } else if (RFID_Master_Correct == true && RFID_SaveNextRead == true) { // If the Master Card is scanned when in programming mode
          delay(1000);
          // Remove all Slave Cards
          for (checkPosition = 0; checkPosition < 10; checkPosition++) { //Read bit fra 0-9
            RFID_Slave1[checkPosition] = 0;
          }
          for (checkPosition = 0; checkPosition < 10; checkPosition++) { //Read bit fra 0-9
            RFID_Slave2[checkPosition] = 0;
          }
          for (checkPosition = 0; checkPosition < 10; checkPosition++) { //Read bit fra 0-9
            RFID_Slave3[checkPosition] = 0;
          }
          EEPROM_Save_Slaves();
          RFID_SaveNextRead = false;
          digitalWrite(PIN_LED, LOW);
        }
        RFID.begin(9600);
        EmptySerialBuffer(); //erase the buffer
      }
      i++; //used in the beginning to write to each bit in the buffer
    }
  }
}

void EmptySerialBuffer() { //replaces all bits in the buffer with zeros
  while (RFID.available()) {
    RFID.read();
  }
  for (i2 = 0; i2 <= i; i2++) {
    buffer[i2] = 0;
  }
  i = 0;
}

void EEPROM_Read_Slaves() {
  byte EPROMaddr;
  for (EPROMaddr = 0; EPROMaddr < 10; EPROMaddr++) { //Read bit from 0-9
    RFID_Slave1[EPROMaddr] = EEPROM.read(EPROMaddr);
  }
  for (EPROMaddr = 10; EPROMaddr < 20; EPROMaddr++) { //Read bit from 0-9
    RFID_Slave2[EPROMaddr - 10] = EEPROM.read(EPROMaddr);
  }
  for (EPROMaddr = 20; EPROMaddr < 30; EPROMaddr++) { //Read bit from 0-9
    RFID_Slave3[EPROMaddr - 20] = EEPROM.read(EPROMaddr);
  }
}

void EEPROM_Save_Slaves() {
  byte EPROMaddr;
  for (EPROMaddr = 0; EPROMaddr < 10; EPROMaddr++) { //Read bit from 0-9
    EEPROM.write(EPROMaddr, RFID_Slave1[EPROMaddr]);
  }
  for (EPROMaddr = 10; EPROMaddr < 20; EPROMaddr++) { //Read bit from 0-9
    EEPROM.write(EPROMaddr, RFID_Slave2[EPROMaddr - 10]);
  }
  for (EPROMaddr = 20; EPROMaddr < 30; EPROMaddr++) { //Read bit from 0-9
    EEPROM.write(EPROMaddr, RFID_Slave3[EPROMaddr - 20]);
  }
}