#!/bin/sh

set -ex

die () { echo "$@" ; cleanup ; exit 1; }

cleanup() {
  cd "${ORIG_PWD}" 2>/dev/null || true
  [ -n "${TMP_DIR-}" ] && rm -rf "${TMP_DIR}"
}

export NVM_DIR="$(cd ../.. && pwd)"

: nvm.sh
\. ../../nvm.sh

\. ../common.sh

ORIG_PWD="$(pwd)"

# Run from a fresh, empty directory so the "no version + no .nvmrc" cases
# (install/run/which) are not masked by an ambient .nvmrc above the test dir.
TMP_DIR="$(mktemp -d)"
cd "${TMP_DIR}" || die "could not cd to temp dir"

# Asserts a subcommand emits the given focused usage line (not the full help
# dump) on stderr, and exits 127.
assert_usage() {
  local EXPECTED_LINE
  EXPECTED_LINE="$1"
  shift

  try_err "$@"

  case "${CAPTURED_STDERR}" in
    *"${EXPECTED_LINE}"*) ;;
    *) die "\`$*\` did not show focused usage >${EXPECTED_LINE}<; got >${CAPTURED_STDERR}<" ;;
  esac
  # the focused usage should NOT be the full help dump
  case "${CAPTURED_STDERR}" in
    *'Show this message'*) die "\`$*\` dumped full help instead of a focused usage" ;;
  esac
  [ "_${CAPTURED_EXIT_CODE}" = "_127" ] \
    || die "\`$*\` expected exit code 127; got ${CAPTURED_EXIT_CODE}"
}

assert_usage 'Usage: nvm cache dir'                  nvm cache bogus
assert_usage 'Usage: nvm install [<version>]'        nvm install
assert_usage 'Usage: nvm run [<version>] [<args>]'   nvm run
assert_usage 'Usage: nvm which [current | <version>]' nvm which
assert_usage 'Usage: nvm uninstall <version>'        nvm uninstall
assert_usage 'Usage: nvm uninstall <version>'        nvm uninstall a b
assert_usage 'Usage: nvm unalias <name>'             nvm unalias
assert_usage 'Usage: nvm unalias <name>'             nvm unalias a b
assert_usage 'Usage: nvm install-latest-npm'         nvm install-latest-npm extra
assert_usage 'Usage: nvm reinstall-packages <version>' nvm reinstall-packages
assert_usage 'Usage: nvm copy-packages <version>'    nvm copy-packages a b

# `nvm use` reaches its focused-usage guard only when version resolution returns
# an empty string. From the CLI that cannot happen: an omitted version is caught
# earlier (the `Please see ... nvmrc` branch), and an unresolvable non-empty
# version yields the "N/A" sentinel, never "". The branch is a defensive guard,
# so drive it directly by stubbing the resolver to return empty. Keep this last:
# the stub stays in effect for the rest of the shell.
nvm_match_version() { nvm_echo ''; }
assert_usage 'Usage: nvm use [<version>]'            nvm use foo

cleanup