#!/usr/bin/env bash
set -o errexit

main() {
  if [[ "${DEBUG}" ]]; then
    set -o xtrace
  fi

  if [[ "${*}" =~ -h|--help|help|wat ]]; then
    __usage "${@}"
    exit 0
  fi

  : "${TMPDIR:=/var/tmp}"

  local tmpout="${TMPDIR}/find-wherewhen-$(date +%s).tmp"
  local calendar_id="${1}"
  shift || true

  : "${START_TIME:=$(date --date='1 years ago' -Iseconds)}"
  : "${END_TIME:=$(date -Iseconds)}"

  if [[ ! "${calendar_id}" ]]; then
    echo Missing \<calendar id\> positional argument
    exit 1
  fi

  if [[ ! "${GOOGLE_API_TOKEN}" ]]; then
    echo Missing \$GOOGLE_API_TOKEN
    exit 1
  fi

  local url='https://www.googleapis.com/calendar/v3/calendars'
  url="${url}/${calendar_id}/events"
  local qs="${qs}maxResults=2500&orderBy=startTime&singleEvents=true"
  qs="${qs}&timeMax=$(__qsval "${END_TIME}")"
  qs="${qs}&timeMin=$(__qsval "${START_TIME}")"
  qs="${qs}&fields=items(summary%2Cend%2FdateTime%2Clocation%2Cstart%2FdateTime)"
  qs="${qs}&key=${GOOGLE_API_TOKEN}"

  echo "GET ${url}?${qs}"
  curl -X GET -s "${url}?${qs}" | jq . >"${tmpout}"
  echo "${tmpout}"
}


__qsval() {
  jq -r '.|@uri' <<<"\"${1}\""
}

__usage() {
  cat <<EOF
Usage: $(basename "${0}") <calendar-id> [-s|--start-time|-e|--end-time]

Find where and when in a given time range (default past 1y).
EOF
}

main "${@}"