#define BLYNK_TEMPLATE_ID "TMPL33W0I8vH2"
#define BLYNK_TEMPLATE_NAME "EV monitor"
#define BLYNK_AUTH_TOKEN "1q2qflGwdaHwIghctqcVHXcYlLr9Ui95"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// -------- WiFi --------
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// -------- Pin Definitions --------
#define ONE_WIRE_BUS 4
#define POT1 34
#define POT2 35
#define LED_PIN 2
#define BUZZER_PIN 15
#define RELAY_PIN 5

// -------- LCD --------
LiquidCrystal_I2C lcd(0x27, 16, 2);

// -------- Temperature --------
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// -------- Thresholds --------
float maxVoltage = 3;
float minVoltage = 1;

float maxCurrent = 4;
float minCurrent = 1;

float maxTemp = 35.0;
float minTemp = 15.0;

void setup() {
  Serial.begin(115200);

  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);

  digitalWrite(RELAY_PIN, HIGH);

  sensors.begin();

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Connecting...");
  
  //  Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  lcd.clear();
  lcd.print("System Ready");
  delay(2000);
  lcd.clear();
}

void loop() {

  Blynk.run();  // 
  // ---- Temperature ----
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);

  // ---- Analog ----
  int potValue1 = analogRead(POT1);
  int potValue2 = analogRead(POT2);

  float voltage = (potValue1 * 3.3) / 4095.0;

  float sensorVoltage = (potValue2 * 3.3) / 4095.0;
  float current = abs((sensorVoltage - 1.65) / 0.185);

  //  Battery %
  float batteryPercent = ((voltage - minVoltage) / (maxVoltage - minVoltage)) * 100;
  batteryPercent = constrain(batteryPercent, 0, 100);

  // ---- Faults ----
  bool overTemp = (temperature > maxTemp);
  bool underTemp = (temperature < minTemp);
  bool overVoltage = (voltage > maxVoltage);
  bool underVoltage = (voltage < minVoltage);
  bool overCurrent = (current > maxCurrent);
  bool underCurrent = (current < minCurrent);

  bool alert = overTemp || underTemp || overVoltage || underVoltage || overCurrent || underCurrent;

  String alertMsg = "SAFE";

  if (overTemp) alertMsg = "High Temp";
  else if (underTemp) alertMsg = "Low Temp";
  else if (overVoltage) alertMsg = "Over Volt";
  else if (underVoltage) alertMsg = "Low Volt";
  else if (overCurrent) alertMsg = "Over Curr";
  else if (underCurrent) alertMsg = "Low Curr";

  // ----  SERIAL DEBUGGING (ADDED) ----
  Serial.print("Temp: "); Serial.print(temperature);
  Serial.print(" °C | Volt: "); Serial.print(voltage);
  Serial.print(" V | Curr: "); Serial.print(current);
  Serial.print(" A | Battery: "); Serial.print(batteryPercent);
  Serial.print("% | Status: "); Serial.println(alertMsg);

  // ---- LCD (UPDATED TO SHOW ALL VALUES) ----
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temperature, 1);
  lcd.print(" V:");
  lcd.print(voltage, 1);

  lcd.setCursor(0, 1);
  lcd.print("I:");
  lcd.print(current, 1);
  lcd.print(" ");
  lcd.print(alertMsg);

  // ---- Relay + Alert ----
  if (alert) {
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
    digitalWrite(RELAY_PIN, LOW);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
    digitalWrite(RELAY_PIN, HIGH);
  }

  // ---- SEND TO BLYNK ----
  Blynk.virtualWrite(V0, temperature);
  Blynk.virtualWrite(V1, voltage);
  Blynk.virtualWrite(V2, current);
  Blynk.virtualWrite(V3, batteryPercent);

  // ---- ALERT NOTIFICATION ----
  static unsigned long lastAlert = 0;

  if (alert && millis() - lastAlert > 10000) {
    Blynk.logEvent("battery_alert", alertMsg);
    lastAlert = millis();
  }

  delay(1000);
}