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

# CASAN Plan-16 SEC-08 (M-06) — pii-mask fails CLOSED.
#
# Previously a missing rules file, an unreadable file, or a broken rule regex made
# pii-mask emit the RAW stdin — silently leaking the very PII a mask rule was meant
# to hide. Now any such condition emits NOTHING and exits non-zero. Normal masking
# with valid rules is unchanged.
#
# Deterministic; hermetic; no model/network.

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
PROJECT_ROOT="$CASAN_APP_ROOT"
PM="$CASAN_HARNESS_ROOT/scripts/bash/pii-mask.py"
RULES="$CASAN_HARNESS_ROOT/security/pii-rules.yaml"
WORK="$(mktemp -d)"
trap 'rm -rf "$WORK"' EXIT

PASS=0; FAIL=0
pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }

echo "===== Plan-16 SEC-08: pii-mask fail-closed ====="

# 1) Valid rules still mask (regression).
OUT="$(printf 'contact bob@example.com now' | python3 "$PM" "$RULES" 2>/dev/null)"
if [[ "$OUT" == *"MASKED"* && "$OUT" != *"bob@example.com"* ]]; then
  pass "valid rules mask the email (no leak)"
else
  fail "valid masking broken (out='$OUT')"
fi

# 2) Missing rules file → no output, non-zero, and NO raw email leaks.
set +e
OUT="$(printf 'secret bob@example.com' | python3 "$PM" "$WORK/nope.yaml" 2>/dev/null)"; RC=$?
set -e 2>/dev/null || true
if [[ "$RC" -ne 0 && -z "$OUT" ]]; then
  pass "missing rules file → empty output, non-zero (fail-closed)"
else
  fail "missing rules leaked (rc=$RC out='$OUT')"
fi

# 3) Broken regex → no output, non-zero (that PII type would otherwise leak).
printf -- '- id: email\n  type: "email"\n  regex: "([unterminated"\n  action: mask\n' > "$WORK/bad.yaml"
set +e
OUT="$(printf 'secret bob@example.com' | python3 "$PM" "$WORK/bad.yaml" 2>/dev/null)"; RC=$?
set -e 2>/dev/null || true
if [[ "$RC" -ne 0 && -z "$OUT" ]]; then
  pass "broken rule regex → empty output, non-zero (fail-closed)"
else
  fail "broken regex leaked (rc=$RC out='$OUT')"
fi

# 4) No rules argument at all → fail-closed.
set +e
OUT="$(printf 'secret bob@example.com' | python3 "$PM" 2>/dev/null)"; RC=$?
set -e 2>/dev/null || true
if [[ "$RC" -ne 0 && -z "$OUT" ]]; then
  pass "no rules argument → empty output, non-zero (fail-closed)"
else
  fail "no-arg leaked (rc=$RC out='$OUT')"
fi

echo ""
echo "===== SEC-08 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
[[ "$FAIL" -eq 0 ]] || exit 1