#!/bin/sh

# `nvm_get_make_jobs` sets the global `NVM_MAKE_JOBS` instead of echoing it, so
# every case runs it in this shell, with its output captured to files.

ORIG_PATH="${PATH}"
TMP_DIR="$(mktemp -d)"

# the probe shims live under `mktemp -d` rather than `.`, because this directory
# is shared with every other unit test and a leaked `getconf` would poison them
SHIMS="${TMP_DIR}/bin"
OUT="${TMP_DIR}/out"
ERR="${TMP_DIR}/err"

cleanup () {
  export PATH="${ORIG_PATH}"
  rm -rf "${TMP_DIR}"
}

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

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

mkdir -p "${SHIMS}"

shim () {
  {
    echo '#!/bin/sh'
    echo "$2"
  } > "${SHIMS}/$1"
  chmod +x "${SHIMS}/$1"
}

# a probe that behaves as if it were not installed, and whose complaint must
# never reach the user
shim_absent () {
  shim "$1" "echo 'PROBE_NOISE: $1' >&2; exit 127"
}

REAL_OS="$(nvm_get_os)"

FAKE_OS=''
nvm_get_os () {
  nvm_echo "${FAKE_OS}"
}

run () {
  FAKE_OS="$1"
  shift
  NVM_MAKE_JOBS=''
  nvm_get_make_jobs "$@" >"${OUT}" 2>"${ERR}"
}

assert_jobs () {
  [ "_${NVM_MAKE_JOBS}" = "_$1" ] \
    || die "${2}: expected NVM_MAKE_JOBS ${1}, got '${NVM_MAKE_JOBS}'"
}

assert_stdout () {
  ACTUAL="$(cat "${OUT}")"
  [ "_${ACTUAL}" = "_$1" ] \
    || die "${2}: expected stdout '${1}', got '${ACTUAL}'"
}

# deliberately narrower than "stderr is empty": ksh93 has no `local`, so every
# nvm.sh function already sprays `local: not found` here (see #574)
assert_no_probe_noise () {
  ! nvm_grep -q 'PROBE_NOISE' "${ERR}" \
    || die "${1}: a failed probe leaked to stderr: '$(cat "${ERR}")'"
}

assert_not_nagged () {
  ! nvm_grep -q 'Please report an issue on GitHub' "${ERR}" \
    || die "${1}: unexpected report-an-issue message"
}

assert_nagged () {
  nvm_grep -q 'Please report an issue on GitHub' "${ERR}" \
    || die "${1}: expected the report-an-issue message, got '$(cat "${ERR}")'"
}

export PATH="${SHIMS}:${ORIG_PATH}"

# an OS the `case` does not name still gets a real core count
shim getconf 'echo 4'
shim_absent nproc

run win
assert_jobs 3 'win'
assert_stdout 'Detected that you have 4 CPU core(s)
Running with 3 threads to speed up the build' 'win'
assert_not_nagged 'win'
assert_no_probe_noise 'win'

run ''
assert_jobs 3 'unknown OS'
assert_not_nagged 'unknown OS'

# Solaris and NetBSD spell the `getconf` variable without the leading underscore
shim getconf 'case "$1" in NPROCESSORS_ONLN) echo 4 ;; *) exit 1 ;; esac'
run win
assert_jobs 3 'unprefixed getconf name'
assert_not_nagged 'unprefixed getconf name'

# with no `getconf`, `nproc` answers
shim_absent getconf
shim nproc 'echo 4'
run win
assert_jobs 3 'nproc'
assert_not_nagged 'nproc'
assert_no_probe_noise 'nproc'

# Cygwin/MSYS/MinGW inherit `NUMBER_OF_PROCESSORS` from Windows
shim_absent nproc
NUMBER_OF_PROCESSORS=4
run win
assert_jobs 3 'NUMBER_OF_PROCESSORS'
assert_not_nagged 'NUMBER_OF_PROCESSORS'
assert_no_probe_noise 'NUMBER_OF_PROCESSORS'

# with nothing to probe, nvm still says so instead of guessing
unset NUMBER_OF_PROCESSORS
run win
assert_jobs 1 'no probes'
assert_nagged 'no probes'

# the named arms keep priority: darwin asks `sysctl`, not `getconf`
shim getconf 'echo 99'
shim sysctl 'echo 4'
run darwin
assert_jobs 3 'darwin uses sysctl'
assert_not_nagged 'darwin uses sysctl'

export PATH="${ORIG_PATH}"

# an explicit count short-circuits detection entirely
run '' 7
assert_jobs 7 'explicit jobs'
assert_stdout 'number of `make` jobs: 7' 'explicit jobs'

# on the real host, detected or not, the result is always usable
run "${REAL_OS}"
nvm_is_natural_num "${NVM_MAKE_JOBS}" \
  || die "real host: expected a natural number, got '${NVM_MAKE_JOBS}'"

cleanup