{
  "version": "2.2.0",
  "name": "Calculate Audit Statistics",
  "description": "Calculate audit log statistics (action counts, user activity)",
  "trigger": {
    "type": "http",
    "method": "GET",
    "path": "/audit-logs/stats"
  },
  "nodes": [
    {
      "id": "validate_context",
      "type": "operation",
      "op": "validate",
      "input": "{{ $context.tenantId }}",
      "validator": "required",
      "errorMessage": "tenantId is required"
    },
    {
      "id": "get_date_range",
      "type": "operation",
      "op": "transform_data",
      "output": {
        "startDate": "{{ new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString() }}",
        "endDate": "{{ new Date().toISOString() }}"
      }
    },
    {
      "id": "count_by_action",
      "type": "operation",
      "op": "database_aggregate",
      "entity": "AuditLog",
      "params": {
        "filter": {
          "tenantId": "{{ $context.tenantId }}",
          "timestamp": {
            "$gte": "{{ $steps.get_date_range.output.startDate }}",
            "$lte": "{{ $steps.get_date_range.output.endDate }}"
          }
        },
        "groupBy": "action",
        "aggregations": {
          "count": "count"
        }
      },
      "output": "actionStats"
    },
    {
      "id": "count_by_entity",
      "type": "operation",
      "op": "database_aggregate",
      "entity": "AuditLog",
      "params": {
        "filter": {
          "tenantId": "{{ $context.tenantId }}",
          "timestamp": {
            "$gte": "{{ $steps.get_date_range.output.startDate }}",
            "$lte": "{{ $steps.get_date_range.output.endDate }}"
          }
        },
        "groupBy": "entity",
        "aggregations": {
          "count": "count"
        }
      },
      "output": "entityStats"
    },
    {
      "id": "format_response",
      "type": "operation",
      "op": "transform_data",
      "output": {
        "dateRange": "{{ $steps.get_date_range.output }}",
        "actionStatistics": "{{ $steps.count_by_action.output }}",
        "entityStatistics": "{{ $steps.count_by_entity.output }}",
        "totalEntries": "{{ $steps.count_by_action.output.reduce((sum, item) => sum + item.count, 0) }}"
      }
    },
    {
      "id": "return_success",
      "type": "action",
      "action": "http_response",
      "status": 200,
      "body": "{{ $steps.format_response.output }}"
    }
  ]
}