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

# CASAN Plan-14 — RBAC decision audit into an H5-style oversight log.
#
# Every RBAC allow/deny decision is recorded (opt-in via CASAN_RBAC_AUDIT_LOG) so a
# reviewer / RAI report / Control Plane can see who was allowed or denied what and
# why. Proves:
#   * an ALLOW decision is logged with verdict + role + action,
#   * a DENY decision is appended (append-only) with its reason,
#   * a cross-tenant DENY records the tenant-boundary reason,
#   * with no audit-log env set, nothing is written (backward compatible).
#
# Deterministic; hermetic; no model/network.

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
RBAC="$CASAN_HARNESS_ROOT/scripts/bash/rbac-check.py"
WORK="$(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-14: RBAC decision audit (oversight log) ====="

LOG="$WORK/rbac-audit.jsonl"

# 1) ALLOW decision is logged
CASAN_RBAC_AUDIT_LOG="$LOG" python3 "$RBAC" check --role org-admin --resource settings --action write >/dev/null 2>&1
{ [[ -f "$LOG" ]] && grep -q '"verdict": "ALLOW"' "$LOG" && grep -q '"role": "org-admin"' "$LOG"; } \
  && pass "ALLOW decision recorded with verdict + role" || fail "ALLOW not audited"

# 2) DENY decision appended (append-only)
CASAN_RBAC_AUDIT_LOG="$LOG" python3 "$RBAC" check --role viewer --resource settings --action write >/dev/null 2>&1 || true
lines="$(grep -c . "$LOG")"
[[ "$lines" -eq 2 ]] && pass "DENY appended (append-only, 2 records)" || fail "audit not append-only (lines=$lines)"
grep -q '"verdict": "DENY"' "$LOG" && grep -q 'ACTION_NOT_ALLOWED' "$LOG" \
  && pass "DENY recorded with reason" || fail "DENY reason not audited"

# 3) cross-tenant DENY records the tenant-boundary reason
CASAN_RBAC_AUDIT_LOG="$LOG" python3 "$RBAC" check --role org-admin --resource settings --action write \
  --role-tenant alpha --target-tenant beta >/dev/null 2>&1 || true
grep -q 'CROSS_TENANT_DENY' "$LOG" \
  && pass "cross-tenant DENY records the tenant-boundary reason" || fail "cross-tenant reason not audited"

# 4) no env set -> nothing written (backward compatible)
NOLOG="$WORK/should-not-exist.jsonl"
python3 "$RBAC" check --role org-admin --resource settings --action write >/dev/null 2>&1
[[ ! -f "$NOLOG" ]] && pass "no audit-log env -> no write (backward compatible)" || fail "wrote audit without env"

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