/*
 * Fab academy 2023
 * Author: Essi Huusko
 * This is a program for Knitter's smart accessory which is documented on the https://fabacademy.org/2023/labs/oulu/students/essi-huusko/final-project.html
 * 
 */
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

unsigned long prMillis = millis();
unsigned long breakTimer = millis();
unsigned long breakInterval = 1800000;
unsigned long nextBreak = breakInterval;

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

const int button = 0;
const int led = 1;
int counter = 0;
int switchState = 1;

void setup() {

pinMode (button, INPUT);
pinMode (led, OUTPUT);

  Serial.begin(115200);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);
  // Display static text
  display.setTextSize(2);
  display.setCursor(0,30);
  // Display static text
  display.println("Hei!");
  display.display();
display.clearDisplay();
display.display();
}

void loop() {
  
  digitalWrite (led, HIGH);
  prMillis = millis();
  breakTimer = millis();
  switchState = digitalRead(button);

  if(breakTimer >= nextBreak)
  {
      digitalWrite (led, LOW);
      display.setTextColor(WHITE);
      display.setCursor(0, 10);
      display.setTextSize(2);
      display.println("Time to   stretch!");
      display.display(); 
  }

  if (switchState == 0){   
    
    if(breakTimer >= nextBreak)
    {
      digitalWrite (led, HIGH);
      nextBreak = millis() + breakInterval;
      display.clearDisplay();
      display.display();
    }
    else
    {
    counter=counter+1;
    display.setTextColor(WHITE);
    display.setCursor(50, 20);
    display.setTextSize(4);
    display.println(counter);
    display.display();
    }

    while(millis() - prMillis < 2000)
    {
      ;
    }
    display.clearDisplay();
    display.display();
  }
}