#include <Wire.h>
//#include <Adafruit_GFX.h>
//#include <Adafruit_SSD1306.h>

const int encDt = 12;
const int encClk = 11;
const int encBtn = 13;
const int signalDetect = 9;
const int standby = 22;
const int standbyTime = 10;  //in seconds
int XYZ;




volatile int volume = -50;
int oldVolume = volume;
int maxVolume = 0;
int minVolume = -60;

long lastSignalDetect;

//Led drive
const int ledPins[] = {15, 16, 17, 18, 19, 20, 21, 22};
const int ledCount = 8;
const int maxBrightness = 200;
const int minBrightness = 0;
float ledDim;
float ledBarHeight;


void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
  //Serial1.println("Hello, Raspberry Pi Pico!");
  //Serial1.println(PIN_WIRE_SDA);
  
  for (XYZ = 0; XYZ < ledCount; XYZ++) {
    pinMode(ledPins[XYZ], OUTPUT);
  }


  pinMode(encClk, INPUT_PULLUP);
  pinMode(encDt, INPUT_PULLUP);
  pinMode(encBtn, INPUT_PULLUP);
  pinMode(signalDetect, INPUT);
  pinMode(standby, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);

  attachInterrupt(digitalPinToInterrupt(encClk), encDecode, FALLING );

  lastSignalDetect = millis();
  digitalWrite(standby, LOW);
  digitalWrite(LED_BUILTIN, LOW);

  
  ledDisplay();
  
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1); // this speeds up the simulation
  
  //encoder volume control
  if (oldVolume != volume) {
    oldVolume = volume; 
    Serial1.println(volume);
    if (volume > maxVolume) {volume = maxVolume;}
    else if(volume < minVolume) {volume = minVolume;}
    ledDisplay();
  } 

  //Signal detect
  if (digitalRead(signalDetect) == HIGH) {
    lastSignalDetect = millis();
    if (digitalRead(standby) == LOW) {digitalWrite(standby, HIGH); digitalWrite(LED_BUILTIN, HIGH);}
  }

  //standby after no signal
  if (millis() - lastSignalDetect > standbyTime * 1000 ) {
    digitalWrite(standby, LOW);
    digitalWrite(LED_BUILTIN, LOW);
  }

}


void encDecode () {
    if (digitalRead(encDt) == LOW) {volume--;}
    else {volume++;}
}

void ledDisplay() {

  ledBarHeight = float(minVolume - volume) / (float(minVolume - maxVolume) / float(ledCount));

  for (XYZ = 0; XYZ < ledCount; XYZ++) {
    if (XYZ < int(ledBarHeight)) {analogWrite(ledPins[XYZ], maxBrightness);}
    else if (XYZ > int(ledBarHeight)) {analogWrite(ledPins[XYZ], minBrightness);}
    else {analogWrite(ledPins[XYZ], (ledBarHeight - XYZ) * maxBrightness);}
  }

}