#!/usr/bin/env bash
set -euo pipefail
if [ "${1:-}" = "--help" ] || [ "${1:-}" = "-h" ]; then
  cat <<'USAGE'
Purpose: Validate documentation-sync-engine output.
Usage:   bash scripts/lint-output.sh <file>   (or stdin)
Exits:   0 clean | 1 issues | 2 usage error
USAGE
  exit 0
fi
if [ "${1:-}" = "" ] || [ "${1:-}" = "-" ]; then body=$(cat)
elif [ -f "$1" ]; then body=$(cat "$1")
else printf 'error: file not found: %s\n' "$1" >&2; exit 2
fi

issues=0
say() { printf '%s\n' "$1" >&2; issues=$((issues+1)); }

if grep -qE '^Documentation Sync: no canonical docs require update\.$' <<<"$body"; then
  printf 'ok\n'; exit 0
fi

grep -qE '^## Documentation Sync' <<<"$body" || say 'missing "## Documentation Sync"'
grep -qE '^Stale Doc Set: Detected: [0-9]+ \| Routed: [0-9]+ \| Skipped \(target_domains filter\): [0-9]+' <<<"$body" \
  || say 'missing or malformed Stale Doc Set summary'
grep -qE '^Known Drift' <<<"$body" || say 'missing "Known Drift" section/line'

domains=$(printf '%s\n' "$body" | grep -E '^### ' | sed -E 's/^### //; s/[[:space:]]+$//')
while IFS= read -r d; do
  [ -z "$d" ] && continue
  case "$d" in
    api|integration|error|glossary|canonical) ;;
    *) say "unknown delegate domain: $d" ;;
  esac
done <<EOF
$domains
EOF

[ "$issues" -gt 0 ] && exit 1
printf 'ok\n'