#!/bin/sh -e

YEAR="${YEAR:-$(date +%Y)}"
DAY="${DAY:-$(TZ=EST date '+%d')}"
IMPL="${IMPL:-rust}"
PARTS="${AOC_PARTS:-1 2}"

ITERS="${ITERS:-10}"

cd "${YEAR}/${IMPL}/day${DAY}"
case "${IMPL}" in
  'rust')
    cargo build --release
    EXECUTABLE="../target/release/day${DAY}"
    ;;
  *)
    echo "Unknown implementation: ${IMPL}" >&2
    exit
    ;;
esac

for PART in $(echo ${PARTS})
do
  export AOC_PARTS="${PART}"
  OUT="time-${YEAR}-${IMPL}-${DAY}-${PART}.txt"

  export TIMEFMT='%uE'
  for I in $(seq "${ITERS}"); do
    zsh -c time "${EXECUTABLE}" "${@}" 2>&1 >/dev/null | tail -1
  done >"${OUT}"
  
  ALL_TIMINGS="$(cat "${OUT}" | sed 's/us/ + /' )"
  NO_OF_ITERS=$(echo "${ALL_TIMINGS}" | wc -l)
  ARITHM="$(echo "( ${ALL_TIMINGS}" | tr -d '\n'; \
      echo "0 ) / ${NO_OF_ITERS}" )"
  MEAN_TIMING=$(( $(echo ${ARITHM}) ))

  printf "${YEAR}-${IMPL}-${DAY}-${PART}: Mean: ${MEAN_TIMING}µs\n"
  printf "${YEAR}-${IMPL}-${DAY}-${PART}: Mean: ${MEAN_TIMING}µs\n" >>"${OUT}"
done