#!/usr/bin/env bash
set -euo pipefail
if [ "${1:-}" = "--help" ] || [ "${1:-}" = "-h" ]; then
  cat <<'USAGE'
Purpose: Validate performance-regression-estimator 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

if grep -qE '^Performance Hazards: none detected\.$' <<<"$body"; then
  printf 'ok\n'; exit 0
fi

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

grep -qE '^## Performance Hazards' <<<"$body" || say 'missing "## Performance Hazards"'
grep -qE '^### Hazard Map' <<<"$body" || say 'missing "### Hazard Map"'
grep -qE '^\| # \| Hazard \| Path \| On hot path\? \| Severity \| Remediation \|' <<<"$body" \
  || say 'Hazard Map missing canonical 6-column header'
grep -qE '^### Recommended Pre-Merge Actions' <<<"$body" || say 'missing "### Recommended Pre-Merge Actions"'

sev=$(printf '%s\n' "$body" | awk -F'|' '/^\|/ && $6 != "" && $6 !~ /Severity/ && $6 !~ /---/ {gsub(/[[:space:]]/,"",$6); print $6}')
while IFS= read -r s; do
  [ -z "$s" ] && continue
  case "$s" in
    high|medium|low) ;;
    *) say "unknown severity: $s" ;;
  esac
done <<EOF
$sev
EOF

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