#!/usr/bin/env bash
test_directory="$(cd "$(dirname "$0")" && pwd)"
bats_executable="${test_directory}/../test_lib/bats-core/bin/bats"

# Locate ourselves for easy reference.
export MAIN_BASH_IT_DIR="${test_directory%/*}"
export MAIN_BASH_IT_GITDIR="${MAIN_BASH_IT_DIR}/.git"

# Make sure BATS is available:
git submodule init && git submodule update

# Warn user that tests run from the current git HEAD
if ! git diff --quiet; then
	echo "${BASH_SOURCE##*/}: your worktree is dirty; uncommitted changes will *not* be tested!"
fi

# Which tests do we run?
if [[ $# -eq '0' ]]; then
	test_dirs=("${test_directory}"/{bash_it,completion,install,lib,plugins,themes})
else
	test_dirs=("$@")
fi

# Make sure that the `parallel` command is installed,
# AND that it is the GNU version of `parallel`.
# If that is the case, try to guess the number of CPU cores,
# so we can run `bats` in parallel processing mode, which is a lot faster.
if command -v parallel &> /dev/null \
	&& parallel -V &> /dev/null \
	&& { parallel -V 2> /dev/null | grep -q '^GNU\>'; }; then
	# Expect to run at least on a dual-core CPU; slightly degraded performance
	# shouldn't matter otherwise.
	declare -i -r test_jobs_default=2
	# shellcheck disable=SC2155
	declare -i -r test_jobs_effective="$(
		if [[ "${TEST_JOBS:-detect}" = "detect" ]] \
			&& command -v nproc &> /dev/null; then
			nproc
		elif [[ -n "${TEST_JOBS}" ]] \
			&& [[ "${TEST_JOBS}" != "detect" ]]; then
			echo "${TEST_JOBS}"
		else
			echo "${test_jobs_default}"
		fi
	)"
	exec "$bats_executable" "${CI:+--tap}" --jobs "${test_jobs_effective}" \
		--no-parallelize-within-files "${test_dirs[@]}"
else
	# Run `bats` in single-threaded mode.
	exec "$bats_executable" "${CI:+--tap}" "${test_dirs[@]}"
fi