#!/usr/bin/env bash
set -eo pipefail; [[ $TRACE ]] && set -x

semver-parse-into() {
  declare VERSION="$1"
  local RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)'
  local MAJOR="$(echo "$VERSION" | sed -e "s#$RE#\1#")"
  local MINOR="$(echo "$VERSION" | sed -e "s#$RE#\2#")"
  local PATCH="$(echo "$VERSION" | sed -e "s#$RE#\3#")"
  echo "${MAJOR} ${MINOR} ${PATCH}"
}

main() {
  declare MIN_VERSION="$1" CHECK_VERSION="$2"
  local IS_AT_LEAST_VERSION=false
  local MAJOR_MIN MINOR_MIN PATCH_MIN MAJOR_CHECK MINOR_CHECK PATCH_CHECK PARSED_MIN PARSED_CHECK

  PARSED_MIN="$(semver-parse-into "$MIN_VERSION")"
  PARSED_CHECK="$(semver-parse-into "$CHECK_VERSION")"
  MAJOR_MIN="$(echo "$PARSED_MIN" | cut -d' ' -f1)"
  MINOR_MIN="$(echo "$PARSED_MIN" | cut -d' ' -f2)"
  PATCH_MIN="$(echo "$PARSED_MIN" | cut -d' ' -f3)"
  MAJOR_CHECK="$(echo "$PARSED_CHECK" | cut -d' ' -f1)"
  MINOR_CHECK="$(echo "$PARSED_CHECK" | cut -d' ' -f2)"
  PATCH_CHECK="$(echo "$PARSED_CHECK" | cut -d' ' -f3)"

  if [[ "$MAJOR_CHECK" -gt "$MAJOR_MIN" ]]; then
    IS_AT_LEAST_VERSION=true
  elif [[ "$MAJOR_CHECK" -eq "$MAJOR_MIN" ]] && [[ "$MINOR_CHECK" -gt "$MINOR_MIN" ]]; then
    IS_AT_LEAST_VERSION=true
  elif [[ "$MAJOR_CHECK" -eq "$MAJOR_MIN" ]] && [[ "$MINOR_CHECK" -eq "$MINOR_MIN" ]] && [[ "$PATCH_CHECK" -ge "$PATCH_MIN" ]]; then
    IS_AT_LEAST_VERSION=true
  fi

  echo "$IS_AT_LEAST_VERSION"
}

main "$@"