RGB turning different colors at different lightings

/*
*Divya Inaganti
*June 14, 2017
*different RGB colors
*/
const int photoPin = A0;
const int PinRed= 9;
const int PinGreen=10;
const int PinBlue= 11;
int photoValue= 0;
int lightVal= 0;
const int pinButton = 4;
int newButton = 0;
int lastButton = 0;
unsigned long timeVal;
int minimum= 1000;
int maximum= -1000;
void setup()

{
  Serial.begin (9600);
 pinMode(photoPin, INPUT);
  pinMode (PinRed, OUTPUT);
  pinMode (PinGreen, OUTPUT);
  pinMode (PinBlue, OUTPUT);
  pinMode(pinButton, INPUT);


analogWrite(PinRed, 255);
analogWrite(PinGreen, 0);
analogWrite(PinBlue,0);
delay(200);
analogWrite(PinRed, 0);
analogWrite(PinGreen, 255);
analogWrite(PinBlue,0);
delay(200);
analogWrite(PinRed, 0);
analogWrite(PinGreen, 0);
analogWrite(PinBlue,255);
delay(200);
analogWrite(PinRed, 0);
analogWrite(PinGreen, 0);
analogWrite(PinBlue,0);

}
 void calibrate()
{
  maximum = -5000;
  minimum = 5000;
  analogWrite(PinGreen, 0);
  analogWrite(PinRed, 0);
  analogWrite(PinBlue, 0);
  delay(200);
  analogWrite(PinRed, 255);
  delay(200);
  analogWrite(PinRed, 0);

 timeVal = millis();
 while(millis()- timeVal < 5000)
{
  photoValue = analogRead(photoPin);
  if(photoValue > maximum)
  {
    maximum = photoValue;
  }
  else if(photoValue < minimum)
  {
    minimum = photoValue;
  }
 }
  Serial.println(minimum);
  Serial.println(maximum);
    analogWrite(PinGreen, LOW);
    delay(200);
    analogWrite(PinRed, LOW);
}
 boolean debounce(boolean last)
 {

  boolean current = digitalRead(pinButton);
  if (last != current)
  {
    delay(5);
    current = digitalRead(pinButton);
  }
  return current;
}
void loop()
{
  newButton = debounce (lastButton);
  if (newButton == HIGH && lastButton == LOW)
  {
    calibrate();
  }
  lastButton = newButton;
  photoValue= analogRead (photoPin);
  lightVal= map(photoValue, minimum, maximum, 255, 0);
  lightVal= constrain(lightVal, 0, 255);
  if (photoValue>minimum && photoValue<(maximum-minimum)/2.5)
  {
    analogWrite(PinBlue, lightVal);
    analogWrite(PinRed, lightVal);
    analogWrite(PinGreen, 0);
  }
  {
  if (photoValue>(maximum-minimum)/2.5  && photoValue<2*(maximum-minimum)/2.5 )
      analogWrite(PinBlue, lightVal);
    analogWrite(PinRed, 0);
    analogWrite(PinGreen, lightVal);
  }
  {
  if (photoValue>2*(maximum-minimum)/2.5&&photoValue<maximum-minimum)
     analogWrite(PinBlue, 0);
    analogWrite(PinRed, lightVal);
    analogWrite(PinGreen, 0);
  }
//  analogWrite(PinBlue, lightVal);
//  analogWrite(PinRed, lightVal);

//  Serial.print ("Photoresistor value = ");
//  Serial.print(photoValue);
//  Serial.print ("lightVal = ");
//  Serial.println(lightVal);
//  analogWrite(PinRed, lightVal);
//  analogWrite(PinBlue, lightVal);
//  analogWrite(PinGreen,0);
//  delay(100);


//
//
//Read (photoPin);
//  lightVal= map(photoValue, 0, 1020, 255, 0);
//  Serial.print ("Photoresistor value = ");
//  Serial.print(photoValue);
//  Serial.print ("lightVal = ");
//  Serial.println(lightVal);
//  delay(100);
}