#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_discord_1_bits[] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xe0,0x03,0xc0,0x07,0x00,0x00,0xfc,0x03,0xc0,0x3f,0x00,0x00,0xff,0xff,0xff,0xff,0x00,0x80,0xff,0xff,0xff,0xff,0x01,0xc0,0xff,0xff,0xff,0xff,0x03,0xc0,0xff,0xff,0xff,0xff,0x03,0xe0,0xff,0xff,0xff,0xff,0x07,0xe0,0xff,0xff,0xff,0xff,0x0f,0xf0,0xff,0xff,0xff,0xff,0x0f,0xf8,0xff,0xff,0xff,0xff,0x1f,0xf8,0xff,0xff,0xff,0xff,0x1f,0xf8,0xff,0xff,0xff,0xff,0x1f,0xfc,0xff,0xff,0xff,0xff,0x3f,0xfc,0xff,0xff,0xff,0xff,0x3f,0xfc,0xff,0xff,0xff,0xff,0x3f,0xfe,0x3f,0xfc,0x3f,0xfc,0x7f,0xfe,0x1f,0xf8,0x1f,0xf8,0x7f,0xfe,0x0f,0xf0,0x0f,0xf0,0x7f,0xfe,0x0f,0xf0,0x0f,0xf0,0x7f,0xff,0x0f,0xf0,0x0f,0xf0,0xff,0xff,0x0f,0xf0,0x0f,0xf0,0xff,0xff,0x0f,0xf0,0x0f,0xf0,0xff,0xff,0x0f,0xf0,0x0f,0xf0,0xff,0xff,0x1f,0xf8,0x1f,0xf8,0xff,0xff,0x7f,0xfe,0x7f,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0x8f,0xff,0xff,0xf1,0x7f,0xfc,0x3f,0xfc,0x3f,0xfc,0x3f,0xf0,0x7f,0x00,0x00,0xfe,0x0f,0xe0,0x3f,0x00,0x00,0xfc,0x07,0x80,0x3f,0x00,0x00,0xfc,0x01,0x00,0x1c,0x00,0x00,0x38,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

const int NUM_SLIDERS = 4;
const int analogInputs[NUM_SLIDERS] = {A0, A1, A2, A3};
// Slider max is 1023

int analogSliderValues[NUM_SLIDERS];
int progress = 150;
char buffer[32];

void setup(void) { 
  u8g2.begin(); // start the u8g2 library
  for (int i = 0; i < NUM_SLIDERS; i++) {
    pinMode(analogInputs[i], INPUT);
  }

  Serial.begin(9600);
}

void loop(void) {
  u8g2.clearBuffer();					// clear the internal memory
  updateSliderValues();
  sendSliderValues(); // Actually send data (all the time)
  // printSliderValues(); // For debug

  u8g2.drawFrame(2, 4, 15, 54);
  u8g2.drawFrame(24, 4, 15, 54);
  u8g2.drawBox(5, 7, 9, 48);
  u8g2.drawBox(27, 7, 9, 48);
  u8g2.drawFrame(42, 4, 15, 54);
  u8g2.drawBox(45, 7, 9, 48);
  u8g2.drawFrame(60, 4, 15, 54);
  u8g2.drawBox(63, 7, 9, 48);
  u8g2.setFont(u8g2_font_t0_17b_tr);
  sprintf(buffer,"%d %%",(int)analogSliderValues[0]);
  u8g2.drawStr(83, 58, buffer);

  u8g2.sendBuffer();					// transfer internal memory to the display
  delay(10);
}

void updateSliderValues() {
  for (int i = 0; i < NUM_SLIDERS; i++) {
     analogSliderValues[i] = analogRead(analogInputs[i]);
  }
}

void sendSliderValues() {
  String builtString = String("");

  for (int i = 0; i < NUM_SLIDERS; i++) {
    builtString += String((int)analogSliderValues[i]);

    if (i < NUM_SLIDERS - 1) {
      builtString += String("|");
    }
  }
  
  Serial.println(builtString);
}

void printSliderValues() {
  for (int i = 0; i < NUM_SLIDERS; i++) {
    String printedString = String("Slider #") + String(i + 1) + String(": ") + String(analogSliderValues[i]) + String(" mV");
    Serial.write(printedString.c_str());

    if (i < NUM_SLIDERS - 1) {
      Serial.write(" | ");
    } else {
      Serial.write("\n");
    }
  }
}