#!/usr/bin/env bash
set -euo pipefail
cd "$(dirname "$0")/.."

test_name="dependency-cache-test-$$"
site_directory="${UCE_TEST_SITE_DIRECTORY:-site}"
source_dir="$site_directory/$test_name"
bin_directory="${BIN_DIRECTORY:-}"
if [[ -z "$bin_directory" && -r /etc/uce/settings.cfg ]]; then
	bin_directory=$(awk -F= '/^[[:space:]]*BIN_DIRECTORY[[:space:]]*=/ {gsub(/^[[:space:]]+|[[:space:]]+$/, "", $2); print $2; exit}' /etc/uce/settings.cfg)
fi
bin_directory="${bin_directory:-/tmp/uce/work}"
cache_dir=""

cleanup() {
	rm -rf "$source_dir"
	if [[ -n "$cache_dir" ]]; then
		rm -rf "$cache_dir"
	fi
}
trap cleanup EXIT
mkdir -p "$source_dir"
cache_dir="$bin_directory$(realpath "$source_dir")"

printf '%s\n' \
	'#ifndef UCE_DEPENDENCY_CACHE_CHILD' \
	'#define UCE_DEPENDENCY_CACHE_CHILD' \
	'String dependency_cache_marker() { return("dependency-marker-a"); }' \
	'#endif' >"$source_dir/child.uce"
printf '%s\n' \
	'#load "child.uce"' \
	'CLI(Request& context) { print(dependency_cache_marker()); }' \
	'RENDER(Request& context) { print(dependency_cache_marker()); }' >"$source_dir/parent.uce"

assert_marker() {
	local path="$1"
	local expected="$2"
	local output
	output=$(scripts/uce-cli "/$test_name/$path.uce")
	if [[ "$output" != *"$expected"* ]]; then
		echo "$path returned stale module; expected $expected: $output" >&2
		exit 1
	fi
}

assert_marker parent dependency-marker-a

sed -i 's/dependency-marker-a/dependency-marker-b/' "$source_dir/child.uce"
assert_marker parent dependency-marker-b

# Warm every configured worker, then replace the artifact while retaining its
# whole-second mtime. The worker cache must notice the nanosecond/ctime change.
for _ in {1..16}; do assert_marker parent dependency-marker-b; done
sed 's/dependency-marker-b/dependency-marker-c/' "$source_dir/child.uce" >"$source_dir/alternate-child.uce"
sed 's/child.uce/alternate-child.uce/' "$source_dir/parent.uce" >"$source_dir/alternate.uce"
assert_marker alternate dependency-marker-c
parent_wasm="$cache_dir/parent.uce.wasm"
alternate_wasm="$cache_dir/alternate.uce.wasm"
parent_mtime=$(stat -c %Y "$parent_wasm")
cp "$alternate_wasm" "$parent_wasm"
touch -d "@$parent_mtime" "$parent_wasm"
rm -f "$cache_dir/parent.uce.cwasm"
for _ in {1..16}; do assert_marker parent dependency-marker-c; done

echo "dependency invalidation passed"