#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include <LiquidCrystal_I2C.h>

/* Pin Definitions */
#define PIN_PH_SENSOR 34
#define PIN_EC_SENSOR 35
#define PIN_PELTIER_MOSFET 32

/* Global Objects */
Adafruit_BME280 bme;
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(115200);
  Serial.println("Grover GrowBox Initializing...");

  /* I2C Setup */
  Wire.begin(21, 22);

  /* LCD Setup */
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Grover Init...");

  /* BME280 Setup */
  if (!bme.begin(0x76)) {
    Serial.println("Could not find a valid BME280 sensor!");
    lcd.setCursor(0, 1);
    lcd.print("BME280 Error!");
  }

  /* GPIO Setup */
  pinMode(PIN_PH_SENSOR, INPUT);
  pinMode(PIN_EC_SENSOR, INPUT);
  pinMode(PIN_PELTIER_MOSFET, OUTPUT);
}

void loop() {
  /* Read Temperature/Humidity */
  float temp = bme.readTemperature();
  float hum = bme.readHumidity();

  /* Read pH/EC (Analog) */
  int phRaw = analogRead(PIN_PH_SENSOR);
  int ecRaw = analogRead(PIN_EC_SENSOR);

  /* Mapping for Simulation */
  float phVal = map(phRaw, 0, 4095, 0, 1400) / 100.0;
  float ecVal = map(ecRaw, 0, 4095, 0, 5000) / 1000.0;

  /* Serial Monitor Display */
  Serial.print("Temp: "); Serial.print(temp); Serial.print("C | ");
  Serial.print("Hum: "); Serial.print(hum); Serial.print("% | ");
  Serial.print("pH: "); Serial.print(phVal); Serial.print(" | ");
  Serial.print("EC: "); Serial.println(ecVal);

  /* LCD Display Update */
  lcd.setCursor(0, 0);
  lcd.print("T:"); lcd.print(temp, 1); lcd.print("C H:"); lcd.print(hum, 0); lcd.print("%");
  
  lcd.setCursor(0, 1);
  lcd.print("pH:"); lcd.print(phVal, 2); lcd.print(" EC:"); lcd.print(ecVal, 2);

  /* Demo Peltier Logic */
  if (temp > 28.0) {
    digitalWrite(PIN_PELTIER_MOSFET, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("COOLING: ON ");
  } else {
    digitalWrite(PIN_PELTIER_MOSFET, LOW);
    lcd.setCursor(0, 2);
    lcd.print("COOLING: OFF");
  }

  delay(2000);
}