#include <Arduino.h>
#include <U8g2lib.h>

#include <Wire.h> // library requires for IIC communication

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); // initialization for the used OLED display

static const unsigned char image_Lock_7x8_bits[] U8X8_PROGMEM = {0x1c,0x22,0x22,0x7f,0x7f,0x77,0x7f,0x3e};
static const unsigned char image_Bluetooth_Idle_5x8_bits[] U8X8_PROGMEM = {0x04,0x0d,0x16,0x0c,0x0c,0x16,0x0d,0x04};
static const unsigned char image_Volup_8x6_bits[] U8X8_PROGMEM = {0x48,0x8c,0xaf,0xaf,0x8c,0x48};
static const unsigned char image_Alert_9x8_bits[] U8X8_PROGMEM = {0x10,0x00,0x38,0x00,0x28,0x00,0x6c,0x00,0x6c,0x00,0xfe,0x00,0xee,0x00,0xff,0x01};

int timePressed;
int act = 0;
int butPin = 3;
long timerDur = 60000;
long timerMax = 0;
long barLength = 100;

int toMill(int mins) {
  return(mins * 60000);
}

int toMin(int mills){
  return(mills / 60000);
}

int progress = 0; // progress of the progressbar
char buffer[32]; // helper buffer to construct a string to be displayed

void setup(void) {
  u8g2.begin(); // start the u8g2 library
}

void loop(void) {
	if (digitalRead(butPin) == HIGH) {
    if (act == 0) {
      timePressed = millis();
      act = 1;
    }
  }

  if (digitalRead(butPin) == LOW) {
    if (act == 1) {
      if (millis() - 500 <= timePressed) {
        switch (timerDur) {
          case (60000):
            timerDur = 300000;
            break;
          case (300000):
            timerDur = 900000;
            break;
          case (900000):
            timerDur = 1800000;
            break;
          case (1800000):
            timerDur = 60000;
            break;
        }
        Serial.println(timerDur);
      } else {
        Serial.print("Duration: ");
        Serial.println(timerDur);
        long endTime = millis() + timerDur;
        Serial.println(endTime);
        timerMax = timerDur;
        while (millis() < endTime) {
          timerDur = endTime - millis();
          Serial.print("Remaining: ");
          Serial.println(timerDur);
        }
      }
    }  
  u8g2.clearBuffer();					// clear the internal memory

  barLength = 100*(timerDur/timerMax);

	u8g2.setBitmapMode(1);
	u8g2.drawFrame(12, 21, 104, 20);
	u8g2.drawBox(14, 23, barLength, 16); // draw the progressbar fill
	u8g2.setFont(u8g2_font_helvB08_tr);
	sprintf(buffer, "Progress: %d%%", barLength); // construct a string with the progress variable
	u8g2.drawStr(33, 53, buffer); // display the string
	u8g2.setFont(u8g2_font_haxrcorp4089_tr);
	u8g2.drawStr(0, 7, "Progress Bar Screen");
	u8g2.drawLine(0, 9, 127, 9);
	u8g2.drawXBMP( 100, 0, 7, 8, image_Lock_7x8_bits);
	u8g2.drawXBMP( 111, 0, 5, 8, image_Bluetooth_Idle_5x8_bits);
	u8g2.drawXBMP( 120, 1, 8, 6, image_Volup_8x6_bits);
	u8g2.drawXBMP( 22, 45, 9, 8, image_Alert_9x8_bits);


  u8g2.sendBuffer();					// transfer internal memory to the display

	} 
}