// LCD1602 and Pi Pico!
#include <LiquidCrystal.h>
#include <OneWire.h>
#include <DallasTemperature.h>

const int powerButton = 2;
const int startStop = 3;
const int stepPin = 16;
const int dirPin = 17;
const int buzzerPin = 14;

int oldValuePower = LOW;
int oldValueStart = LOW;

String programs[] = {"ECO", "Fast", "Regular"};
int durations[] = {200, 100, 150};

OneWire oneWire(28);
DallasTemperature sensors(&oneWire);
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
int pos = 0;
void setup() {
  lcd.begin(20, 4);
  resetLcd();

  pinMode(powerButton, INPUT);
  pinMode(startStop, INPUT);
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(stepPin, LOW);

  sensors.begin();
  delay(20);
}

void buttonPressed() {
  int numPrograms = 3;
  pos++;
  if (pos >= numPrograms) {
    pos = 0;
  }
  if (pos < 0) {
    pos = numPrograms - 1;
  }
  sensors.requestTemperatures();
  writeLcd(programs[pos], 0, 1);
  writeLcd(String(durations[pos]) + " ms", 0, 2);
  writeLcd(String(sensors.getTempCByIndex(0)), 0, 3);
}

void loop() {
  int newValuePower = digitalRead(powerButton);
  if(newValuePower != oldValuePower)
  {
    if(newValuePower == HIGH)
    {
      buttonPressed();
    }
    // Remember the value for the next time.
    oldValuePower = newValuePower;
  }

  int newValueStart = digitalRead(startStop);
  if(newValueStart != oldValueStart)
  {
    if(newValueStart == HIGH)
    {
      runProgram();
    }
    // Remember the value for the next time.
    oldValueStart = newValueStart;
  }
  delay(10); // Adding a delay() here speeds up the simulation
}

void runProgram(){
  int duration = durations[pos];
  writeLcd("Running program:", 0, 0);
  writeLcd(String(durations[pos]) + "/" + String(durations[pos]) + " ms", 0, 2);
  digitalWrite(dirPin, HIGH);
  for (int i = 0; i < duration; i++) {
    digitalWrite(stepPin, HIGH);
    digitalWrite(stepPin, LOW);
    int remainingTime = duration - (i + 1);
    String padding = "";
    if (remainingTime < 100){
      padding += "0";
    }
    if (remainingTime < 10){
      padding += "0";
    } 
    lcd.setCursor(0, 2);
    lcd.print(padding + String(remainingTime));
    delay(5);
  }
  writeLcd("Finished program:", 0, 0);
  delay(30);
  for (int j = 0; j < 3; j++){
    tone(buzzerPin, 1760, 20);
    delay(200);
  }
  resetLcd();
}

void writeLcd(String msg, int column, int row){
    lcd.setCursor(column, row);
    for(int n = column; n < 20; n++) // 20 indicates symbols in line.
        {
                lcd.print(" ");
        }
    lcd.setCursor(column, row);
    lcd.print(msg);
}

void printBlanks(int amount){
  for (int i = 0; i < amount; i++){
    lcd.print(" ");
  }
}

void resetLcd(){
  writeLcd("Select program:", 0, 0);
  writeLcd(programs[pos], 0, 1);
  writeLcd(String(durations[pos]) + " ms", 0, 2);
}