package src;

import java.io.FileReader;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Day03 {
    public static void main(String[] args) {
        Instant start = Instant.now();
        part1();
        Instant middle = Instant.now();
        part2();
        Instant end = Instant.now();
        IO.println("part 1: " + Duration.between(start, middle).toMillis() + " ms");
        IO.println("part 2: " + Duration.between(middle, end).toMillis() + " ms");
    }

    private static void part1() {
        try (Scanner scanner = new Scanner(new FileReader("resources/inputs/03/input"))) {
            int sum = 0;
            while (scanner.hasNextLine()) {
                String raw = scanner.nextLine();
                List<String> bank = List.of(raw.split(""));
                int a = 0;
                int b = 1;
                int curr = Integer.parseInt(bank.get(a) + bank.get(b));
                for (int i = 2; i < bank.size(); i++) {
                    int candidateA = Integer.parseInt(bank.get(a) + bank.get(i));
                    int candidateB = Integer.parseInt(bank.get(b) + bank.get(i));
                    if (candidateA > curr) {
                        curr = candidateA;
                        b = i;
                    }
                    if (candidateB > curr) {
                        curr = candidateB;
                        a = b;
                        b = i;
                    }
                }
                sum += curr;
            }
            IO.println(sum);
        } catch (Exception e) {
            IO.println(e.getMessage());
        }
    }

    private static void part2() {
        try (Scanner scanner = new Scanner(new FileReader("resources/inputs/03/input"))) {
            long sum = 0L;
            while (scanner.hasNextLine()) {
                String raw = scanner.nextLine();
                List<String> bank = List.of(raw.split(""));
                // first, get the initial 12 batteries
                List<String> curr = new ArrayList<>(bank.subList(0, 12));
                for (int i = 12; i < bank.size(); i++) {
                    curr.add(bank.get(i)); // add the next battery to the end of the list
                    // find the smallest battery in the list that's ahead of a larger battery
                    int t1 = 0;
                    int t2 = 1;
                    while (t2 < curr.size() && Integer.parseInt(curr.get(t1)) >= Integer.parseInt(curr.get(t2))) {
                        t1++;
                        t2++;
                    }
                    curr.remove(t1);
                }
                sum += Long.parseLong(String.join("", curr));
            }
            IO.println(sum);
        } catch (Exception e) {
            IO.println(e.getMessage());
        }
    }
}