#include <LoRa.h>
#include <SoftwareSerial.h>

SoftwareSerial sim(6, 5);
String buffer;
String numbers[] = {
 "09998876775",
 "09876543210",
 "09335540308" // example 
};

int totalNumbers = 3; //number of phone numbers

int gled = 7;
int yled = 4;
int rled = 3;
int brightness = 0;
int fadeRate = 5;
int piezo = 8;
int beepCount = 1;

const int maxBeepCountY = 3;
const int maxBeepCountR = 10;

String inString = "";
int data = 0;
int syncWord = 0x26;
int waterSensorCM = 0;
int waterLevel = 0;

void setup() {
  Serial.begin(9600);
  buffer.reserve(200);
  sim.begin(9600);

  pinMode(gled, OUTPUT);
  pinMode(yled, OUTPUT);
  pinMode(rled, OUTPUT);
  pinMode(piezo, OUTPUT);

  while (!Serial);
  Serial.println("LoRa Receiver");

  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  LoRa.setSpreadingFactor(12);
  LoRa.setSignalBandwidth(62.5E3);
  LoRa.setCodingRate4(8);
  LoRa.setSyncWord(syncWord);
}

void loop() {
  int packetSize = LoRa.parsePacket();
  if (packetSize) {
    inString = "";

    while (LoRa.available()) {
      int inChar = LoRa.read();
      inString += (char)inChar;
      data = inString.toInt();
    }

  data = inString.toInt();

  int firstComma = inString.indexOf(',');

  if (firstComma == -1) {

    if (data == 11) {
        digitalWrite(gled, LOW);
        digitalWrite(yled, HIGH);
        digitalWrite(rled, LOW);
        if (beepCount <= maxBeepCountY) {
            tone(piezo, 1000);
            delay(300);
            noTone(piezo);
            delay(200);
            beepCount++;
        }
        Serial.println("Status Code: Code Yellow! WARNING! Water detected!");
    }
    
    else {
        waterSensorCM = data;
        Serial.print("Water Depth: ");
        Serial.print(waterSensorCM);
        Serial.println("cm");
    }
  }

  else {
    data = inString.substring(0, firstComma).toInt();
    waterLevel = inString.substring(firstComma + 1).toInt();

    Serial.println("Status Code: Code Red! WARNING! Water has accumulated to 2 inches!");
    Serial.print("Water Level: ");
    Serial.println(waterLevel);

    String msg = "⚠ Potential flood detected! Water has reached " + String(waterLevel) + " cm and is rapidly increasing.";
    sendAllNumbers(msg);

    Serial.println("SMS Sent!");
  }

  Serial.print("RSSI: ");
  Serial.println(LoRa.packetRssi());
}
}

void sendSMS(String number, String message) {
    sim.println("AT+CMGF=1");
    delay(200);
    sim.print("AT+CMGS=\"");
    sim.print(number);
    sim.println("\"");
    delay(200);
    sim.println(message);
    sim.write(26);
    delay(5000);
}

void sendAllNumbers(String message) {
    for (int i = 0; i < totalNumbers; i++) {
        sendSMS(numbers[i], message);
        Serial.print("Message sent to: ");
        Serial.println(numbers[i]);
    }
}