package Advent2019;

import util.AdventOfCode;

import java.util.List;

public class Day2 extends AdventOfCode {
    int[] register;

    public Day2(List<String> input) {
        super(input);
        title = "";
        part1Description = "";
        part2Description = "";
    }

    void runProgram(int noun, int verb) {
        int pos = 0;
        register[1] = noun;
        register[2] = verb;
        while (register[pos] != 99) {
            if (register[pos] == 1) {
                register[register[pos + 3]] = register[register[pos + 1]] + register[register[pos + 2]];
            } else {
                register[register[pos + 3]] = register[register[pos + 1]] * register[register[pos + 2]];
            }
            pos += 4;
        }
    }

    @Override
    public Object part1() {
        runProgram(12, 2);
        return register[0];
    }

    @Override
    public Object part2() {

        // brute force, why not
        for (int i = 0; i < 100; i++) {
            for (int j = 0; j < 100; j++) {
                parse();
                runProgram(i, j);
                if (register[0] == 19690720) return 100 * register[1] + register[2];
            }
        }
        return 0;
    }

    @Override
    public void parse() {
        String[] inp = input.get(0).split(",");
        //String inp[] = { "2", "4", "4", "5", "99", "0"};
        register = new int[inp.length];
        for (int i = 0; i < inp.length; i++) {
            register[i] = Integer.parseInt(inp[i]);
        }
    }

}