#include <esp_now.h>
#include <WiFi.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

// Structure example to receive data
// Must match the sender structure
typedef struct struct_message {
    int a;
    float b;
    int c;
} struct_message;

// Create a struct_message called myData
struct_message myData;

// callback function that will be executed when data is received
void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Int: ");
  Serial.println(myData.a);
  Serial.print("Float: ");
  Serial.println(myData.b);
  Serial.print("Int: ");
  Serial.println(myData.c);
}
 
int already0 = 0;
int already1 = 0;
float storeprevtemp = 0;

//This records the low value over the last 24 hrs
float outMin = 0;                                           //outdoor min temp in time interval
float outMax = 0;                                           //outdoor min temp in time interval
unsigned long previousMillis = millis();                    // Last time the counter was reset (initialize to present time).
const long    interval24 = 86400000;                        // 24 hour interval in milliseconds.
unsigned long soFar;                                        // Time since the last low reading.
unsigned long time1 = 0;


void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);

  // Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
//    Serial.println("Error initializing ESP-NOW");
    return;
  }
  
  // Once ESPNow is successfully Init, we will register for recv CB to
  // get recv packer info
  esp_now_register_recv_cb(esp_now_recv_cb_t(OnDataRecv));

}
 
void loop() {

  //print current pool temp if value changed
    if (myData.b != storeprevtemp){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Pool: ");
      lcd.print(myData.b);
      lcd.print((char)223);
      lcd.print("C"); 
    }

  //do something if "button pressed" on the transmitter
    if (myData.a == 0){                                            // recognise a "button pressed" on the transmitter
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Pressed");
    }

  //save min and max temps over 24hrs
    unsigned long currentMillis = millis();                        // Record time now.
    if (currentMillis - previousMillis >= interval24 ||        // Has 24 hours gone by...
      myData.b <= outMin || outMin == 0) {                         // ...or has a new low temperature occurred?
      outMin = myData.b;                                           // If so, record the new low temperature and...
      previousMillis = currentMillis; 
    }                            // ...start the 24 hour counter over.

    if (currentMillis - previousMillis >= interval24 ||            // Has 24 hours gone by...
      myData.b >= outMax ) {                                       // ...or has a new low temperature occurred?
      outMax = myData.b;                                           // If so, record the new low temperature and...
      previousMillis = currentMillis; 
    }                                                              // ...start the 24 hour counter over.

    soFar = currentMillis - previousMillis;                        // Calculate the time since the last reading, in milliseconds.

  //print out min and max temps
    lcd.setCursor(0,1);                                            // code to print min and max temps over 24 hrs on lcd
    lcd.print("L");  
    lcd.print(outMin);  
    lcd.print("  H");  
    lcd.print(outMax);  

if(myData.c == 0){
  time1 = millis();
}

    if (millis() >= time1 + 1200000){
      lcd.clear(); 
      lcd.setCursor(0,0);
      lcd.print("NO SIGNAL");
      lcd.setCursor(0,1);
      lcd.print((millis()-time1)/1000);
    }
    
    
    storeprevtemp = myData.b;

    Serial.println("---------");
    Serial.print("my data a: ");
    Serial.println(myData.a);
    Serial.print("my data b: ");
    Serial.println(myData.b);
    Serial.print("my data c: ");
    Serial.println(myData.c);
    Serial.println("changing my data c to 1");
    myData.c = 1;
    Serial.println(myData.c);
    Serial.println("---------");

   //end of loop, delay
  delay(1000);                                                     // Wait 1 second between readings.

}