#!/usr/bin/env bash
# Fixture coverage for the isolated-HOME observed-run wrapper.
set -euo pipefail
cd "$(dirname "$0")/.." || exit 1

tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT

# A fake "real" HOME holding a precious save at the platform data-dir path.
fake_home="$tmp/home"
case "$(uname -s)" in
  Darwin) data_dir="$fake_home/Library/Application Support/misaligned" ;;
  *) data_dir="$fake_home/.local/share/misaligned" ;;
esac
mkdir -p "$data_dir"
printf 'precious playthrough\n' > "$data_dir/misaligned_save.txt"

run() {
  HOME="$fake_home" XDG_DATA_HOME="" bash tools/observed-run.sh "$@"
}

# 1. A child that writes a save into its own HOME lands in the sandbox and
#    leaves the real save untouched.
log="$tmp/sandboxed.log"
run sh -c '
  case "$(uname -s)" in
    Darwin) dir="$HOME/Library/Application Support/misaligned" ;;
    *) dir="${XDG_DATA_HOME:-$HOME/.local/share}/misaligned" ;;
  esac
  mkdir -p "$dir"
  printf "sandbox save\n" > "$dir/misaligned_save.txt"
' 2> "$log"
grep -q "real save directory untouched" "$log" || {
  echo "FAIL: observed-run did not report the real save untouched" >&2
  exit 1
}
sandbox=$(sed -n 's/^observed-run: sandbox HOME: //p' "$log")
found=$(find "$sandbox" -name misaligned_save.txt | head -1)
if [ -z "$found" ] || ! grep -q "sandbox save" "$found"; then
  echo "FAIL: the child write did not land in the sandbox HOME" >&2
  exit 1
fi
rm -rf "$sandbox"
[ "$(cat "$data_dir/misaligned_save.txt")" = "precious playthrough" ] || {
  echo "FAIL: the real save changed under a clean sandboxed run" >&2
  exit 1
}

# 2. A child that reaches the real save directory anyway must fail the run.
log="$tmp/breakout.log"
if run sh -c "echo junk >> '$data_dir/misaligned_save.txt'" 2> "$log"; then
  echo "FAIL: observed-run accepted a run that modified the real save" >&2
  exit 1
fi
grep -q "real save directory changed" "$log" || {
  echo "FAIL: observed-run failed without naming the real save change" >&2
  exit 1
}
sandbox=$(sed -n 's/^observed-run: sandbox HOME: //p' "$log")
rm -rf "$sandbox"
printf 'precious playthrough\n' > "$data_dir/misaligned_save.txt"

# 3. The child's exit status propagates when the real save is untouched.
log="$tmp/status.log"
status=0
run sh -c 'exit 3' 2> "$log" || status=$?
[ "$status" -eq 3 ] || {
  echo "FAIL: observed-run rewrote the child exit status ($status != 3)" >&2
  exit 1
}
grep -q "real save directory untouched" "$log" || {
  echo "FAIL: a failing child still needs the untouched verdict" >&2
  exit 1
}
sandbox=$(sed -n 's/^observed-run: sandbox HOME: //p' "$log")
rm -rf "$sandbox"

echo "observed-run fixtures: OK"