#!/usr/bin/env bash
# Deterministic transport-only contract tests; no live pane or model access.
set -euo pipefail
HERE=$(cd -- "$(dirname -- "$0")" && pwd)
TMP=$(mktemp -d)
trap 'rm -rf "$TMP"' EXIT
mkdir "$TMP/bin"
cat > "$TMP/bin/tmux" <<'FAKE'
#!/usr/bin/env bash
[ "${1:-}" != -L ] || shift 2
printf '%s\n' "$1" >> "$CALLS"
case "$1" in
 display-message) [ "$FAIL_OP" != target ] || exit 1; printf '%%7\n' ;;
 load-buffer) cat > "$PAYLOAD"; [ "$FAIL_OP" != load ] || exit 1 ;;
 paste-buffer) [ "$FAIL_OP" != paste ] || exit 1 ;;
 send-keys) [ "$FAIL_OP" != key ] || exit 1 ;;
 capture-pane) echo 'ERROR: transport must not inspect application display' >&2; exit 99 ;;
esac
FAKE
chmod +x "$TMP/bin/tmux"
body=$'你好 transport\nsecond line'
for mode in none target load paste key; do
 : > "$TMP/calls"
 set +e
 PATH="$TMP/bin:$PATH" CALLS="$TMP/calls" PAYLOAD="$TMP/payload" FAIL_OP="$mode" \
 bash "$HERE/send-message.sh" -L isolated -t '=fixture' -r 999 -v -m "$body" > "$TMP/out" 2> "$TMP/err"
 rc=$?
 set -e
 expected=2; [ "$mode" != none ] || expected=0; [ "$mode" != target ] || expected=1
 [ "$rc" -eq "$expected" ]
 ! grep -q capture-pane "$TMP/calls"
 keys=$(grep -c '^send-keys$' "$TMP/calls" || true)
 pastes=$(grep -c '^paste-buffer$' "$TMP/calls" || true)
 [ "$keys" -le 1 ] && [ "$pastes" -le 1 ]
 if [ "$mode" = none ]; then
  grep -qx 'transport dispatched; application acceptance unknown' "$TMP/out"
  [ "$keys" -eq 1 ] && [ "$pastes" -eq 1 ]
  [ "$(<"$TMP/payload")" = "$body" ]
 else
  ! grep -q 'transport dispatched' "$TMP/out"
 fi
 echo "PASS transport $mode exit=$rc paste=$pastes keys=$keys"
done