#!/data/data/com.termux/files/usr/bin/bash
# Runs the headless GDScript gameplay tests from Termux, via the Godot
# 4.7.1 Linux arm64 build installed inside the proot-distro Ubuntu container.
#
#   bash tests/run_tests.sh                 # everything
#   bash tests/run_tests.sh formation       # only tests matching a substring
#   JOBS=1 bash tests/run_tests.sh          # serial, for debugging a hang
#   VERBOSE=1 bash tests/run_tests.sh       # print passing tests' output too
#   IN_PLACE=1 bash tests/run_tests.sh      # run from the project dir itself
#
# Three things make this fast, in descending order of how much they matter
# (measured, not guessed - see tests/_profile_startup.gd):
#
# 1. It runs from a COPY on Termux's own filesystem, not from the project
#    directory. The project lives under ~/storage/shared, which is Android's
#    FUSE bridge; read through proot on top of that, `load("res://Main.tscn")`
#    alone took 8.5s per test, against ~2s from a native path. Nearly every
#    test loads Main.tscn, and none of that time is gameplay. The copy is
#    ~1.4s for the whole suite and its .godot import cache is kept between
#    runs.
# 2. Tests run JOBS at a time. Each is its own Godot process - they call
#    quit() and stamp on the GameState autoload, so they cannot share one -
#    which makes the suite a pile of independent, single-core-bound jobs on
#    an 8-core phone.
# 3. The whole run happens in ONE `proot-distro login`. Entering the
#    container costs ~0.5s, which used to be paid once per test.
#
# Output is buffered per test and printed only for failures; six interleaved
# logs are unreadable.

set -uo pipefail

PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"

# Leave headroom: Godot is memory-hungry and this is a phone, not a build
# server. Override with JOBS= if you know better.
JOBS="${JOBS:-6}"
VERBOSE="${VERBOSE:-0}"
IN_PLACE="${IN_PLACE:-0}"
WORK_DIR="${WORK_DIR:-$HOME/.cache/spaceship-tests}"

filter="${1:-}"
tests=()
for path in "$PROJECT_DIR"/tests/test_*.gd; do
	name="$(basename "$path")"
	if [[ -z "$filter" || "$name" == *"$filter"* ]]; then
		tests+=("$name")
	fi
done

if (( ${#tests[@]} == 0 )); then
	echo "no tests match '$filter'"
	exit 2
fi

start=$(date +%s)

run_dir="$PROJECT_DIR"
if [[ "$IN_PLACE" != "1" ]]; then
	run_dir="$WORK_DIR"
	mkdir -p "$run_dir"
	# Clear last run's sources but keep .godot, so imports stay warm. Without
	# the clear, a test deleted from the project would live on in the copy and
	# keep being run.
	find "$run_dir" -mindepth 1 -maxdepth 1 ! -name '.godot' -exec rm -rf {} +
	# android/ and builds/ are export artefacts no test touches, and the .apk
	# is 30MB of nothing useful here.
	tar -C "$PROJECT_DIR" \
		--exclude=./.godot --exclude=./android --exclude=./builds --exclude='*.apk' \
		-cf - . 2>/dev/null | tar -C "$run_dir" -xf -
fi

proot-distro login ubuntu -- bash "$run_dir/tests/_run_inside.sh" \
	"$run_dir" "$JOBS" "$VERBOSE" "${tests[@]}"
status=$?

echo "in $(( $(date +%s) - start ))s with JOBS=$JOBS"
exit $status