#!/usr/bin/env bash
set -euo pipefail

# Live CI supply-chain gate. Unlike the deterministic local denylist gate, this
# obtains current advisory data and scans the built images. Missing scanners are
# an error in strict CI; no "scanner unavailable => green" path exists.
#
# Usage: live-supply-chain-scan.sh <report-dir> [image-ref ...]
# Required tools: npm, osv-scanner, trivy (when CASAN_REQUIRE_LIVE_SCANNERS=1)

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/casan-paths.sh"
ROOT="$CASAN_APP_ROOT"
OUT="${1:-}"; shift || true
[[ -n "$OUT" ]] || { echo "LIVE_SCAN_USAGE report-dir [image-ref ...]" >&2; exit 64; }
mkdir -p "$OUT"

fail() { echo "LIVE_SUPPLY_CHAIN_FAIL $*" >&2; exit 1; }
require() { command -v "$1" >/dev/null 2>&1 || fail "tool_missing name=$1"; }
require npm
if [[ "${CASAN_REQUIRE_LIVE_SCANNERS:-1}" == "1" ]]; then
  require osv-scanner
  require trivy
fi

[[ -f "$ROOT/package-lock.json" ]] || fail "package_lock_missing"
cd "$ROOT"

# npm audit exits non-zero for findings at/above the requested level. Preserve
# JSON evidence even on failure without converting a failed scan into success.
set +e
npm audit --omit=dev --audit-level=high --json > "$OUT/npm-audit.json" 2> "$OUT/npm-audit.stderr"
audit_rc=$?
set -e
[[ "$audit_rc" -eq 0 ]] || fail "npm_audit_high_or_critical rc=$audit_rc report=$OUT/npm-audit.json"

npm sbom --sbom-format cyclonedx --package-lock-only --omit=dev > "$OUT/npm.cyclonedx.json" \
  || fail "npm_sbom_failed"
python3 - "$OUT/npm.cyclonedx.json" <<'PY' || exit 1
import json, sys
d = json.load(open(sys.argv[1]))
assert d.get("bomFormat") == "CycloneDX", d
PY

if command -v osv-scanner >/dev/null 2>&1; then
  osv-scanner scan source --recursive --format json --output-file "$OUT/osv-source.json" "$ROOT" \
    || fail "osv_source_findings_or_scan_error report=$OUT/osv-source.json"
fi
if command -v trivy >/dev/null 2>&1; then
  trivy fs --scanners vuln,secret,misconfig --severity HIGH,CRITICAL --exit-code 1 --format json --output "$OUT/trivy-source.json" "$ROOT" \
    || fail "trivy_source_findings_or_scan_error report=$OUT/trivy-source.json"
fi

for image in "$@"; do
  safe="$(printf '%s' "$image" | tr '/:@' '___')"
  if command -v osv-scanner >/dev/null 2>&1; then
    osv-scanner scan image --format json --output-file "$OUT/osv-image-${safe}.json" "$image" \
      || fail "osv_image_findings_or_scan_error image=$image"
  fi
  if command -v trivy >/dev/null 2>&1; then
    trivy image --severity HIGH,CRITICAL --exit-code 1 --format json --output "$OUT/trivy-image-${safe}.json" "$image" \
      || fail "trivy_image_findings_or_scan_error image=$image"
  fi
done

echo "LIVE_SUPPLY_CHAIN_PASS sbom=$OUT/npm.cyclonedx.json images=$#"