package AoC;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Day1 {
  public static void partA(Scanner fileScanner) {

    int startValue = 50;
    int password = 0;
    while (fileScanner.hasNext()) {
      String line = fileScanner.nextLine();
      char direction = line.charAt(0);
      int rot = Integer.parseInt(line.substring(1));
      switch (direction) {
      case 'R':
        startValue += rot;
        startValue %= 100;
        break;
      case 'L':
        startValue -= rot;
        startValue %= 100;
        break;
      default:
        break;
      }

      if (startValue == 0)
        password += 1;
    }
    System.out.println(password);
  }
  static int countRotations(int start, int rot) {
    int newVal = start + rot;
    if (newVal >= 100) {
      return (start != 0 ? 1 : 0) + (rot - start) / 100;
    } else if (newVal <= 0) {
      return (start != 0 ? 1 : 0) + (- rot - start) / 100;
    } else {
      return 0;
    }
  }

  public static void partB(Scanner fileScanner) {
    int startValue = 50;
    int n_rotations = 0;
    while (fileScanner.hasNext()) {
      String line = fileScanner.nextLine();
      int commentStart = line.indexOf('#');
      int rotationsOnTurn = 0;
      if (commentStart != -1) {
        line = line.substring(0, commentStart).trim();
      }
      char direction = line.charAt(0);
      int rot = Integer.parseInt(line.substring(1));
      switch (direction) {
      case 'R':
        rotationsOnTurn = countRotations(startValue, rot);
        startValue += rot;
        break;
      case 'L':
        rotationsOnTurn = countRotations(startValue, -rot);
        startValue -= rot;
        break;
      default:
        break;
      }
      if (startValue < 0)
        startValue = (startValue % 100 + 100) % 100;
      else
        startValue = startValue % 100;
      n_rotations += rotationsOnTurn;
      System.out.println("Action: " + line + String.format(" : +%d, (%d), %d", rotationsOnTurn, startValue, n_rotations));
    }
    System.out.println(n_rotations);
  }

  public static void main(String[] args) {
    File file = new File("inputs/day1.txt");
    Scanner fileScanner = null;
    try {
      fileScanner = new Scanner(file);
    } catch (FileNotFoundException e) {
      System.out.println("File not found: " + e.getMessage());
      System.exit(1);
    }
    partB(fileScanner);
  }
}