#!/usr/bin/env bash
set -e;

cd "$(dirname "$0")";

run_comp() {
    IFS="," read -r -a ops < ./input;

    i=0;
    ops[1]=$1;
    ops[2]=$2;

    while true; do
        op="${ops[i]}";
        case "$op" in
            1|2)
                inputa="${ops[i+1]}";
                inputb="${ops[i+2]}";
                output="${ops[i+3]}";
                i=$((i + 4));
                a="${ops[inputa]}"
                b="${ops[inputb]}"
                if [ "$op" -eq "1" ]; then
                    x=$((a + b));
                else
                    x=$((a * b));
                fi
                ops[output]=$x;
                ;;
            99)
                break;
                ;;
            *)
                echo "Invalid op: $op";
                exit 1;
                ;;
        esac
    done
    echo "${ops[0]}";
}

echo "part 1: ";
run_comp 12 2;
echo;
echo "part 2: ";
for noun in $(seq 1 99); do
    for verb in $(seq 1 99); do
        if [ "$(run_comp $noun $verb)" -eq 19690720 ]; then
            echo "$((100 * noun + verb))";
            exit;
        fi
    done;
done;