#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

function usage {
    echo "USAGE:"
    echo "  $0 [options]"
    echo ""
    echo "SUMMARY:"
    echo "  Run the solution for the specified Advent of Code challenge"
    echo ""
    echo "OPTIONS:"
    echo "  -h, --help:"
    echo "    print this help message"
    echo ""
    echo "  -y, --year:"
    echo "    specify the year"
    echo ""
    echo "  -d, --day:"
    echo "    specify the day of the advent calendar"
}

while [[ $# -gt 0 ]]; do
    arg="$1"
    case $arg in
        -h|--help)
            usage
            exit 0
            ;;
        -y|--year)
            YEAR=$2
            shift
            shift
            ;;
        -d|--day)
            DAY=$2
            shift
            shift
            ;;
        *)
            shift
            ;;
    esac
done

if [[ -z "${YEAR+x}" ]]; then
    echo "ERROR: please specify the year."
    echo ""
    usage
    exit 1
fi

if [[ -z "${DAY+x}" ]]; then
    echo "ERROR: please specify the day."
    echo ""
    usage
    exit 1
fi

go run "./${YEAR}/day-${DAY}"