#!/usr/bin/env bash

set -euo pipefail

sumNumbers() {
    local sum
    sum=0
    while IFS= read -r num || [[ -n "$num" ]]; do
        sum=$(( "$sum" + "$num" ))
    done
    echo "$sum"
}

gameIds () {
    sed 's|Game \(.*\): .*|\1|'
}

maxColour() {
    local colour counts
    colour=$1
    counts=$(echo "0 $colour"
             sed 's|Game .*: ||;
                  s|, |\n|g;
                  s|; |\n|g' |
                 grep "$colour")
    sort --general-numeric-sort <<< "$counts" |
        tail -1 |
        sed "s| $colour||"
}

gamesWhichFitTheLimit() {
    local maxReds maxGreens maxBlues
    while IFS= read -r line || [[ -n "$line" ]]; do
        maxReds=$(maxColour "red" <<< "$line")
        maxGreens=$(maxColour "green" <<< "$line")
        maxBlues=$(maxColour "blue" <<< "$line")
        if [[ "$maxReds" -le 12 ]] && [[ "$maxGreens" -le 13 ]] && [[ "$maxBlues" -le 14 ]]; then
            echo "$line"
        fi
    done
}

powers () {
    local maxReds maxGreens maxBlues
    while IFS= read -r line || [[ -n "$line" ]]; do
        maxReds=$(maxColour "red" <<< "$line")
        maxGreens=$(maxColour "green" <<< "$line")
        maxBlues=$(maxColour "blue" <<< "$line")
        echo "$(( "$maxReds" * "$maxGreens" * "$maxBlues"))"
    done
}

main () {
    local input
    input=$(cat)
    echo "Part 1 Answer: $(<<<"$input" gamesWhichFitTheLimit | gameIds | sumNumbers)"
    echo "Part 2 Answer: $(<<<"$input" powers | sumNumbers)"
}

main