#include <U8g2.h>
#include <DHT.h>
#include <Adafruit_Sensor.h>
#include <Preferences.h>

// Pines de Botones
#define BTN1 35
#define BTN2 34
#define SENSOR_TEMP 23
#define LED 25
//Maquina de estados
int Maquina;
//Estados
#define PantallaInit 39
#define ConfirmBTN1 40
#define Umbral 41
#define ConfirmBTN2 42
#define Confirmar_Subir 56

//Variables
int umb;
float temp;
unsigned long Time = 0;
int VerificacionUP;
int VerificacionDown;
Preferences preferences;

DHT dht(SENSOR_TEMP, DHT11);
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/U8X8_PIN_NONE);

void setup() {
  // put your setup code here, to run once:
  pinMode(BTN1, INPUT_PULLUP);
  pinMode(BTN2, INPUT_PULLUP);
  Serial.begin(9600);
  u8g2.begin();
  dht.begin();
  preferences.begin("my-app", false);
  umb = preferences.getInt("Umbralsito", 24);
  Maquina = PantallaInit;
}

void loop() {
  // put your main code here, to run repeatedly:
  // unsigned long Millis = millis();

  temp = dht.readTemperature();
  switch (Maquina) {
    case PantallaInit:
      INIT();
      if (digitalRead(BTN1) == LOW && digitalRead(BTN2) == HIGH) {
        Maquina = ConfirmBTN1;
        Time = millis();
      }
      // Serial.println("INIT");
      break;

    case ConfirmBTN1:


      // Serial.println("ConfirmBTN1");
      INIT();
      if (digitalRead(BTN1) == HIGH && millis() - Time >= 5000 && digitalRead(BTN2) == HIGH) {
        Maquina = Umbral;
      }

      if (digitalRead(BTN1) == HIGH && millis() - Time <= 5000) {
        Maquina = PantallaInit;
      }


      break;


    case Umbral:
      Serial.println("Umbral");
      Time = millis();
      Pantalla_Umbral();
      VerificacionDown = 0;
      VerificacionUP = 0;
      if (digitalRead(BTN1) == LOW && VerificacionUP == 0) {
        Maquina = Confirmar_Subir;
        VerificacionUP = 1;
      }

      if (digitalRead(BTN2) == LOW) {
        Maquina = ConfirmBTN2;
      }

      break;

    case Confirmar_Subir:

      if (digitalRead(BTN1) == HIGH) {
        umb++;
        Maquina = Umbral;
      }
      break;


    case ConfirmBTN2:
      //Serial.println("ConfirmBTN2");
      Pantalla_Umbral();
      if (digitalRead(BTN2) == HIGH && millis() - Time >= 5000 && digitalRead(BTN1) == HIGH) {
        Maquina = PantallaInit;
        preferences.putInt("Umbralsito", umb); // Guardar el umbral
      }


      if (digitalRead(BTN2) == HIGH && millis() - Time <= 5000 && VerificacionDown == 0) {
        umb--;
        Maquina = Umbral;
        VerificacionDown=1;
      }
      break;
  }
}






void Pantalla_Umbral() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_ncenB14_tr);
  u8g2.setCursor(32, 30);
  u8g2.print(umb);
  u8g2.drawStr(55, 30, "°C");
  u8g2.drawStr(15, 50, "-");
  u8g2.drawStr(100, 50, "+");

  u8g2.sendBuffer();
}

void INIT() {
  u8g2.clearBuffer();

  u8g2.setFont(u8g2_font_ncenB14_tr);
  u8g2.drawStr(4, 15, "TP EEPROM");

  u8g2.setFont(u8g2_font_ncenB08_tr);
  u8g2.drawStr(0, 30, "Temperatura: ");
  u8g2.setCursor(80, 30);
  u8g2.print(temp);
  u8g2.drawStr(110, 30, "°C");
  u8g2.drawStr(0, 45, "Umbral:");
  u8g2.setCursor(80, 45);
  u8g2.print(umb);
  u8g2.drawStr(110, 45, "°C");

  u8g2.sendBuffer();
}