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

# CASAN Plan-14 — RBAC decision engine (harness-owned core) tests.
# Deterministic. Proves deny-by-default, action gating, tenant isolation,
# sensitive-requires-org-admin, and Separation of Duties.

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"

PASS=0; FAIL=0
pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
allow() { python3 "$RBAC" "$@" >/dev/null 2>&1; }   # rc 0 = allow
deny()  { ! python3 "$RBAC" "$@" >/dev/null 2>&1; }  # rc!=0 = deny

echo "===== Plan-14 RBAC decision engine (harness core) ====="

# org-admin can do anything
allow check --role org-admin --resource settings --action write \
  && pass "org-admin allowed settings:write" || fail "org-admin denied"

# viewer can read but not write
allow check --role viewer --resource monitoring --action read --role-project p1 --target-project p1 \
  && pass "viewer allowed monitoring:read" || fail "viewer read denied"
deny check --role viewer --resource settings --action write --role-project p1 --target-project p1 \
  && pass "viewer denied settings:write (deny-by-default)" || fail "viewer write not denied"

# unknown role denied
deny check --role hacker --resource monitoring --action read \
  && pass "unknown role denied" || fail "unknown role not denied"

# tenant isolation: project-admin of p1 cannot touch p2
deny check --role project-admin --resource settings --action write --role-project p1 --target-project p2 \
  && pass "cross-tenant write denied" || fail "cross-tenant not denied"
allow check --role project-admin --resource settings --action write --role-project p1 --target-project p1 \
  && pass "same-tenant write allowed" || fail "same-tenant write denied"

# sensitive settings write requires org-admin
deny check --role project-admin --resource settings --action write --role-project p1 --target-project p1 --sensitive \
  && pass "sensitive write denied for project-admin" || fail "sensitive write not denied"
allow check --role org-admin --resource settings --action write --sensitive \
  && pass "sensitive write allowed for org-admin" || fail "org-admin sensitive denied"

# SoD: proposer cannot approve own request
deny check-sod --proposer alice@x --approver alice@x \
  && pass "SoD blocks self-approval" || fail "SoD did not block self-approval"
allow check-sod --proposer alice@x --approver bob@x \
  && pass "SoD allows distinct approver" || fail "SoD blocked distinct approver"

# IdP claim → RBAC role mapping (deny-by-default on unknown claim)
[[ "$(python3 "$RBAC" map-claim --claim casan-org-admin 2>/dev/null)" == "org-admin" ]] \
  && pass "known IdP claim maps to RBAC role" || fail "known claim did not map"
deny map-claim --claim casan-random-group \
  && pass "unknown IdP claim denied (deny-by-default)" || fail "unknown claim not denied"

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