/*
  Rotary Encoder volume control example

  Usage: rotate the knob to control the value,
  click the knob to change between volume/bass/treble.

  https://wokwi.com/arduino/projects/304919215794553409

  Released under the MIT license.
  Copyright (C) 2021, Uri Shaked.
*/

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSansBold9pt7b.h>
#include <Fonts/Picopixel.h>

#define ENCODER_CLK 2
#define ENCODER_DT  3
#define ENCODER_SW  4

uint8_t volume = 0;
uint8_t bass = 0;
uint8_t treble = 0;

typedef enum {
  SET_VOLUME,
  SET_BASS,
  SET_TREBLE,
} Mode;

Mode mode = SET_VOLUME;

Adafruit_SSD1306 display(128, 64, &Wire, -1);

int frequncy = 87;
int numfreq;
int delta_scroll;
int value = 870;


void setup()
{
  Serial.begin(9600);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  updateDisplay();
}


long int modeLastChanged = 0;
int prevClk = LOW;

void loop()
{
  if (digitalRead(ENCODER_SW) == LOW && millis() - modeLastChanged > 300)
  {
    modeLastChanged = millis();
    nextMode();
    updateDisplay();
  }

  int clk = digitalRead(ENCODER_CLK);
  if (clk != prevClk && clk == 1)
  {
    int dt = digitalRead(ENCODER_DT);
    int delta;

    if (dt != clk)
    {
      delta += 4;
      delta_scroll += 4;
      value += 1;

      if (delta_scroll > 20)
        delta_scroll = 4;

    } else {
      delta -= 4;
      delta_scroll -= 4;
      value -= 1;

      if (delta_scroll < -20)
        delta_scroll = -4;

    }

    //Serial.println(delta);
    Serial.println(delta_scroll);
    Serial.println(numfreq);

    updateValue(delta);
    updateDisplay();
  }
  prevClk = clk;
}


void nextMode()
{
  switch (mode)
  {
    case SET_VOLUME:
      mode = SET_BASS;
      break;

    case SET_BASS:
      mode = SET_TREBLE;
      break;

    case SET_TREBLE:
      mode = SET_VOLUME;
      break;
  }
}

void updateValue(int delta) {
  switch (mode) {
    case SET_VOLUME:
      volume = volume + delta;
      break;

    case SET_BASS:
      bass = constrain(bass + delta, 0, 100);
      break;

    case SET_TREBLE:
      treble = constrain(treble + delta, 0, 100);
      break;
  }
}


void updateDisplay()
{
  display.clearDisplay();
  display.setFont();
  display.setTextColor(1);

  switch (mode)
  {
    case SET_VOLUME:
      volume_display();
      break;

    case SET_BASS:
      bass_display();
      break;

    case SET_TREBLE:
      treble_display();
      break;
  }
}


void volume_display()
{
  display.setCursor(5, 2);
  display.print("FM Radio");
  display.setCursor(65, 2);
  display.print((value+1)*0.1);
  display.drawRoundRect(0, 15, 128, 42, 2, WHITE);
  display.drawLine(60, 55, 60, 15, WHITE);


 

//********************************************************************

  int temp = value -10;
  for (int i = 0; i < 22; i++)
  {
    if ((temp % 10) == 0)
    {
      display.drawLine(i * 5, 40, i * 5, 50, WHITE);
      display.drawLine((i * 5) + 5, 30, (i * 5) + 5, 50, WHITE);
      display.setCursor(i * 5, 20);

      display.print(temp/10);
    }
    else if ((temp % 5) == 0 && (temp % 10) != 0)
    {

      display.drawLine(i * 5, 40, i * 5, 50, WHITE);
      display.drawLine((i * 5) + 5, 30, (i * 5) + 5, 50, WHITE);

    }
    else
    {
      display.drawLine(i * 5, 40, i * 5, 50, WHITE);
    }

    temp = temp + 1;
  }

//********************************************************************







  //display.setCursor(numfreq+20 ,20);
  //display.print(frequncy);

  display.display();
}


void bass_display()
{

  display.setCursor(48, 22);
  display.print("Bass");
  display.drawRoundRect(10, 32, 102, 9, 2, WHITE);
  display.fillRect(11, 33, bass, 7, WHITE);
  if (mode == SET_BASS)
  {
    display.setCursor(38, 22);
    display.print(">");
  }
  display.display();
}


void treble_display()
{
  display.setCursor(42, 42);
  display.print("Treble");
  display.drawRoundRect(10, 52, 102, 9, 2, WHITE);
  display.fillRect(11, 53, treble, 7, WHITE);
  if (mode == SET_TREBLE)
  {
    display.setCursor(32, 42);
    display.print(">");
  }

  display.display();
}