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

//U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0);
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0);

byte audioBarH[7];
byte audioPeak[7];
int MAX_BAR_HEIGHT = 46;
int BAR_BASE_YPOS = 53;

void setup() {
  u8g2.setDrawColor(1);
  u8g2.setContrast(255);
  u8g2.setBitmapMode(1);
  u8g2.begin();

  //testing bars
  audioBarH[0] = 10;
  audioBarH[1] = 30;
  audioBarH[2] = 50;
  audioBarH[3] = 45;
  audioBarH[4] = 25;
  audioBarH[5] = 16;
  audioBarH[6] = 32;
  
}

int counter = 0;
void loop() {
  counter = (counter + 1) % 10000;
  if (counter % 1000 != 0) return;

  u8g2.clearBuffer(); // clear buffer to store content in RAM

  for (int i=0; i<sizeof(audioBarH); ++i) { // for every frequency
    int rndHeight = random(1024);
    audioBarH[i] = audioBarH[i] + ((map(rndHeight, 0, 1024, 0, MAX_BAR_HEIGHT) - audioBarH[i]) / 1.5);

    if (audioPeak[i] < audioBarH[i])
      audioPeak[i] = audioBarH[i];
    else if(audioPeak[i] > audioBarH[i])
      audioPeak[i]--;

    u8g2.drawBox(2 + i * 19, BAR_BASE_YPOS - audioBarH[i], 10, audioBarH[i]); // draw bar
    u8g2.drawBox(2 + i * 19, BAR_BASE_YPOS - audioPeak[i], 10, 1); // draw peak
  }

  u8g2.setFont(u8g2_font_nerhoe_tr);
  u8g2.drawStr(24, 8, "Graphic Equalizer");
  u8g2.drawStr(2, 64, "63");
  u8g2.drawStr(20, 64, "160");
  u8g2.drawStr(38, 64, "400");
  u8g2.drawStr(60, 64, "1k");
  u8g2.drawStr(74, 64, "2.5k");
  u8g2.drawStr(93, 64, "6.25k");
  u8g2.drawStr(116, 64, "16k");

  u8g2.sendBuffer();
}