#!/bin/sh

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

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

nvm_version_greater 0.10.0 0.2.12 || die '"nvm_version_greater 0.10.0 0.2.12" did not return true'
nvm_version_greater 0.20.12 0.10.0 || die '"nvm_version_greater 0.20.12 0.10.0" did not return true'
nvm_version_greater v18.20.0 v18.19.9 || die '"nvm_version_greater v18.20.0 v18.19.9" did not return true'

if nvm_version_greater 0.10.0 0.20.12; then
  die '"nvm_version_greater 0.10.0 0.20.12" returned true'
fi

if nvm_version_greater 0.10.0 0.10.0; then
  die '"nvm_version_greater" returned false for the same two versions'
fi

if nvm_version_greater v18.20.0 v18.20.0; then
  die '"nvm_version_greater v18.20.0 v18.20.0" returned true for the same two versions'
fi

if nvm_version_greater v18.19.9 v18.20.0; then
  die '"nvm_version_greater v18.19.9 v18.20.0" returned true'
fi

# a partial version is not a plain `x.y.z`, so it keeps the awk comparison
nvm_version_greater 0.10 0.2.12 || die '"nvm_version_greater 0.10 0.2.12" did not return true'

# the comparison must not write anything to stdout (zsh's `typeset` prints a
# local variable when it is redeclared)
OUTPUT="$(nvm_version_greater 0.10.0 0.2.12 2>&1)"
[ -z "${OUTPUT}" ] || die "nvm_version_greater 0.10.0 0.2.12 wrote output: '${OUTPUT}'"

# `nvm_version_greater` must not fork a command for a plain `x.y.z` pair:
# mock `awk`, which the comparison used, and fail if it runs
TEST_DIR="$(pwd)/nvm_version_greater_tmp"
[ ! -e "${TEST_DIR}" ] && mkdir "${TEST_DIR}"
MOCK_BIN="${TEST_DIR}/bin"
mkdir -p "${MOCK_BIN}"
{
  echo '#!/bin/sh'
  echo 'echo "awk was called" >&2'
  echo 'exit 1'
} > "${MOCK_BIN}/awk"
chmod +x "${MOCK_BIN}/awk"

PATH="${MOCK_BIN}:${PATH}" nvm_version_greater 0.10.0 0.2.12 \
  || die 'nvm_version_greater 0.10.0 0.2.12 forked a command'

PATH="${MOCK_BIN}:${PATH}" nvm_version_greater v18.20.0 v18.19.9 \
  || die 'nvm_version_greater v18.20.0 v18.19.9 forked a command'

rm -rf "${TEST_DIR}"