/*
  74HC165 Shift register input example

  https://wokwi.com/arduino/projects/306031380875182657

  (C) 2021, Uri Shaked
*/

// register pins:
const int dataPin = 2;   /* Q7 */
const int clockPin = 3;  /* CP */
const int latchPin = 4;  /* PL */

const int numOfRegisters = 2;
const int numBits = 8 * numOfRegisters;   /* Set to 8 * number of shift registers */

// pins for joystick:
const int SW_pin = 5; // digital pin connected to switch output
const int X_pin = A1; // analog pin connected to X output
const int Y_pin = A0; // analog pin connected to Y output
const String jsValues[] = {"up", "down", "left", "right"};
String jsPosition;

void setup() {
  Serial.begin(115200);
  pinMode(dataPin, INPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);

  pinMode(SW_pin, INPUT);
  digitalWrite(SW_pin, HIGH);
  String jsPosition = "Standing by...";
}

void loop() {
  // Step 1: Sample
  digitalWrite(latchPin, LOW);
  digitalWrite(latchPin, HIGH);

  // Step 2: Shift
  Serial.print("Bits: ");
  for (int i = 0; i < numBits; i++) {
    int bit = digitalRead(dataPin);
    if (bit == HIGH) {
      Serial.print("1");
    } else {
      Serial.print("0");
    }
    digitalWrite(clockPin, HIGH); // Shift out the next bit
    digitalWrite(clockPin, LOW);
  }

  Serial.println();
  char buffer[30];
  int xval = pseudolog(analogRead(X_pin));
  int yval = pseudolog(analogRead(Y_pin));
  sprintf(buffer, "Switch: %d (%d,%d)\n", digitalRead(SW_pin), xval, yval);
  Serial.println(buffer);
  joystickPosition(xval, yval);
  Serial.print("direction of joystick: ");
  Serial.println(jsPosition);
  delay(1000);
}

int pseudolog(int val) {
  if (val < 1023 / 2) {
    return map(val, 0, 1023 / 10, 0, 1023 / 2);
  } else {
    return map(val, 1023 / 10, 1023, 1023 / 2, 1023);
  }
}

String joystickPosition(int x, int y){
  if(x == 738 && y == 738){
    //do nothing;
  }
  else if(x == 738 && y == 1023){
    jsPosition = jsValues[0];
  }
  else if(x == 738 && y == 0){
    jsPosition = jsValues[1];
  }
  else if(x == 1023 && y == 738){
    jsPosition = jsValues[2];
  }
  else {
    jsPosition = jsValues[3];
  }

}