// Program for integrating brake lights and turn signals into bike handlebars.

int ledB1 = 5, ledG1 = 6, ledR1 = 3, ledB2 = 10, ledG2 = 11, ledR2 = 9;
int lButton = 2, rButton = 4, lButtonState = 0, rButtonState = 0;
int brakeTime = 4000;
int turnTime = 400, turnCount = 8;
int checkCount = 0, limit = 2;
int wait = 20, longWait = 40, shortWait = 20, lightMax = 255;
int off = 255, on = 0;
int upperBound = 140, lowerBound = 60;

void setup()
{
  pinMode(ledB1, OUTPUT);
  pinMode(ledG1, OUTPUT);
  pinMode(ledR1, OUTPUT);
  pinMode(ledB2, OUTPUT);
  pinMode(ledG2, OUTPUT);
  pinMode(ledR2, OUTPUT);
  pinMode(lButton, INPUT);
  pinMode(rButton, INPUT);
}

void loop()
{
  randColor();
}

void check()
{
  lButtonState = digitalRead(lButton);
  rButtonState = digitalRead(rButton);
  if(lButtonState == HIGH || rButtonState == HIGH)
  {
    if(lButtonState == HIGH && rButtonState == HIGH)
    {
      brake();
    }
    else if(lButtonState == HIGH)
    {
      lTurn();
    }
    else
    {
      rTurn();
    }
  }
}

void updateCheck()
{
  checkCount++;
  if(checkCount > limit)
  {
    checkCount = 0;
    check();
  }
}

void randColor()
{
  // red, green fade in
  for(int i = 190; i < lightMax; i++)
  {
    updateCheck();
    if(i > lowerBound && i < 255)
    {
      wait = longWait;
    }
    else
    {
      wait = shortWait;
    }
    analogWrite(ledB2, off);
    analogWrite(ledG2, off - i);
    analogWrite(ledR2, on);
    analogWrite(ledB1, off);
    analogWrite(ledG1, off - i);
    analogWrite(ledR1, on);
    delay(wait);
  }
  // red fade out, green
  for(int i = 0; i < lightMax; i++)
  {
    updateCheck();
    if(i > 0 && i < upperBound)
    {
      wait = longWait;
    }
    else
    {
      wait = shortWait;
    }
    analogWrite(ledB2, off);
    analogWrite(ledG2, on);
    analogWrite(ledR2, on + i);
    analogWrite(ledB1, off);
    analogWrite(ledG1, on);
    analogWrite(ledR1, on + i);
    delay(wait);
  }
  // green, blue fade in
  for(int i = 0; i < lightMax; i++)
  {
    updateCheck();
    if(i > lowerBound && i < upperBound)
    {
      wait = longWait;
    }
    else
    {
      wait = shortWait;
    }
    analogWrite(ledB2, off - i);
    analogWrite(ledG2, on);
    analogWrite(ledR2, off);
    analogWrite(ledB1, off - i);
    analogWrite(ledG1, on);
    analogWrite(ledR1, off);
    delay(wait);
  }
  // green fade out, blue
  for(int i = 0; i < lightMax; i++)
  {
    updateCheck();
    if(i > lowerBound && i < upperBound)
    {
      wait = longWait;
    }
    else
    {
      wait = shortWait;
    }
    analogWrite(ledB2, on);
    analogWrite(ledG2, on + i);
    analogWrite(ledR2, off);
    analogWrite(ledB1, on);
    analogWrite(ledG1, on + i);
    analogWrite(ledR1, off);
    delay(wait);
  }
  // blue, red fade in
  for(int i = 0; i < lightMax; i++)
  {
    updateCheck();
    if(i > lowerBound && i < upperBound)
    {
      wait = longWait;
    }
    else
    {
      wait = shortWait;
    }
    analogWrite(ledB2, on);
    analogWrite(ledG2, off);
    analogWrite(ledR2, off - i);
    analogWrite(ledB1, on);
    analogWrite(ledG1, off);
    analogWrite(ledR1, off - i);
    delay(wait);
  }
  // blue fade out, red
  for(int i = 0; i < 120; i++)
  {
    updateCheck();
    if(i > lowerBound && i < upperBound)
    {
      wait = longWait;
    }
    else
    {
      wait = shortWait;
    }
    analogWrite(ledB2, on + i);
    analogWrite(ledG2, off);
    analogWrite(ledR2, on);
    analogWrite(ledB1, on + i);
    analogWrite(ledG1, off);
    analogWrite(ledR1, on);
    delay(wait);
  }
}

void brake()
{
  red();
  delay(brakeTime);
}

void lTurn()
{
  for(int i = 0; i < turnCount; i++)
  {
    lRed();
    delay(turnTime);
    allOff();
    delay(turnTime);
  }
}

void rTurn()
{
  for(int i = 0; i < turnCount; i++)
  {
    rRed();
    delay(turnTime);
    allOff();
    delay(turnTime);
  }
}

void lRed()
{
  allOff();
  digitalWrite(ledG1, HIGH);
  digitalWrite(ledR1, LOW);
  digitalWrite(ledB1, HIGH);
}

void rRed()
{
  allOff();
  digitalWrite(ledG2, HIGH);
  digitalWrite(ledR2, LOW);
  digitalWrite(ledB2, HIGH);
}

void red()
{
  allOff();
  digitalWrite(ledG2, HIGH);
  digitalWrite(ledR2, LOW);
  digitalWrite(ledB2, HIGH);
  digitalWrite(ledG1, HIGH);
  digitalWrite(ledR1, LOW);
  digitalWrite(ledB1, HIGH);
}

void allOff()
{
  digitalWrite(ledG1, HIGH);
  digitalWrite(ledR1, HIGH);
  digitalWrite(ledB1, HIGH);
  digitalWrite(ledG2, HIGH);
  digitalWrite(ledR2, HIGH);
  digitalWrite(ledB2, HIGH);
}