#!/bin/sh

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

cleanup() {
  unset -f install_nvm_from_git install_nvm_as_script nvm_detect_profile nvm_has
  unset -f nvm_check_global_modules nvm_install_node
  unset -f setup cleanup die assert_nvm_dir_line
  unset NVM_ENV METHOD PROFILE
  rm -rf "${TMPDIR_FOR_TEST-}" 2>/dev/null
}

setup() {
  NVM_ENV=testing \. ../../install.sh

  # Mock installation functions to do nothing
  install_nvm_from_git() { :; }
  install_nvm_as_script() { :; }
  nvm_check_global_modules() { :; }
  nvm_install_node() { :; }

  # Mock nvm_has to return true for git
  nvm_has() {
    case "$1" in
      git) return 0 ;;
      xcode-select) return 1 ;;
      *) return 1 ;;
    esac
  }

  # no profile found, so the lines to add are printed
  nvm_detect_profile() {
    echo ""
  }
}

TMPDIR_FOR_TEST="$(mktemp -d)"
TEST_HOME="${TMPDIR_FOR_TEST}/home"
mkdir -p "${TEST_HOME}/.nvm" "${TEST_HOME}2/nvm" "${TMPDIR_FOR_TEST}/a.b/.nvm" "${TMPDIR_FOR_TEST}/axb/.nvm" "${TMPDIR_FOR_TEST}/c:d/.nvm"

# `nvm_do_install` unsets every `nvm_` function when it finishes, so each run sources the installer and mocks afresh.
assert_nvm_dir_line() {
  setup
  OUTPUT="$(HOME="$1" PROFILE='' METHOD='' NVM_DIR="$2" nvm_do_install 2>/dev/null)"
  EXPECTED="export NVM_DIR=\"$3\""
  echo "${OUTPUT}" | command grep -qxF "${EXPECTED}" || die "HOME=$1 NVM_DIR=$2: expected line >${EXPECTED}<; got >${OUTPUT}<"
}

# inside $HOME: written relative to $HOME
assert_nvm_dir_line "${TEST_HOME}" "${TEST_HOME}/.nvm" '$HOME/.nvm'

# a sibling directory whose name starts with $HOME is not inside $HOME
assert_nvm_dir_line "${TEST_HOME}" "${TEST_HOME}2/nvm" "${TEST_HOME}2/nvm"

# with HOME=/, every absolute path starts with $HOME
assert_nvm_dir_line '/' "${TEST_HOME}2/nvm" "${TEST_HOME}2/nvm"

# $HOME is matched literally, not as a regex
assert_nvm_dir_line "${TMPDIR_FOR_TEST}/a.b" "${TMPDIR_FOR_TEST}/axb/.nvm" "${TMPDIR_FOR_TEST}/axb/.nvm"
assert_nvm_dir_line "${TMPDIR_FOR_TEST}/c:d" "${TMPDIR_FOR_TEST}/c:d/.nvm" '$HOME/.nvm'

# with an empty HOME, no path is inside it
assert_nvm_dir_line '' "${TEST_HOME}/.nvm" "${TEST_HOME}/.nvm"

cleanup