#!/bin/bash

function default_dates()
{
  case "${OSTYPE}" in
    darwin*)
      date "+%Y-%m-%d"
      ;;
    *)
      date --rfc-3339=date
      ;;
  esac
}

function default_minutes()
{
  case "${OSTYPE}" in
    darwin*)
      echo "0$( jot -r 1 0 59 )" | sed -E "s|.+(..)|\1|g"
      ;;
    *)
      echo "0$( rand -M 60 )" | sed "s|.\+\(..\)\$|\1|g"
      ;;
  esac
}

function default_hours()
{
  seq -w 0 23
}

if ! command -v faketime >/dev/null 2>&1 ; then
  echo "timemachine requires libfaketime to be installed!"
  exit 1
fi

# parse options/arguments
until [[ -z "${1}" ]] ; do
  case "${1}" in
    --minute)
      shift
      minutes="${minutes} ${1}"
      ;;
    --hour)
      shift
      hours="${hours} ${1}"
      ;;
    --date)
      shift
      dates="${dates} ${1}"
      ;;
    --fail-at-end)
      fail_at_end=1
      ;;
    -*)
      echo "Unknown option '${1}'"
      exit 1
      ;;
    *)
      tests="${tests} ${1}"
      ;;
  esac
  shift
done

for date in ${dates-$( default_dates )} ; do
  for minute in ${minutes-$( default_minutes )} ; do
    for hour in ${hours-$( default_hours )} ; do
      date_time="${date}T${hour}:${minute}"
      for single_test in ${tests} ; do
        echo "Running test ${single_test} at ${date_time}"
        faketime "${date_time}" "${single_test}"
        if [[ $? -ne 0 ]] ; then
          echo "Test ${single_test} broke at ${date_time}!"
          [[ ${fail_at_end-0} -ne 0 ]] || break 2
        fi
      done
    done
  done
done