class ReportService:
    # 报表服务先保留演示统计结果，后续可替换为真实聚合查询。
    def performance_report(self) -> dict:
        return {
            "stat_type": "month",
            "list": [
                {
                    "stat_period": "2026-05",
                    "order_count": 10,
                    "order_amount": 10000,
                    "category_amounts": [{"category_id": 1, "category_name": "工业品", "amount": 6000}],
                    "commission_amount": 500,
                }
            ],
        }

    def export_performance_report(self) -> dict:
        return {
            "file_url": "https://oss.example.com/export/performance.xlsx",
            "file_name": "performance.xlsx",
        }


report_service = ReportService()