ccdi/lsfx-mock-server/services/statement_service.py

from typing import Dict, List, Union
import logging
import random
import uuid
from datetime import datetime, timedelta

from services.statement_rule_samples import (
    IDENTITY_CARD_POOL,
    build_large_transaction_seed_statements,
)

# 配置日志
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


class StatementService:
    """流水数据服务"""

    def __init__(self, file_service=None):
        # 缓存：logId -> (statements_list, total_count)
        self._cache: Dict[int, tuple] = {}
        self.file_service = file_service
        logger.info("StatementService initialized with empty cache")

    def _resolve_primary_binding(self, log_id: int) -> tuple:
        """优先从 FileService 读取真实主绑定，不存在时再走 deterministic fallback。"""
        if self.file_service is not None:
            record = self.file_service.get_file_record(log_id)
            if record is not None:
                return record.primary_enterprise_name, record.primary_account_no

        rng = random.Random(f"binding:{log_id}")
        return "张传伟", f"{rng.randint(100000000000000, 999999999999999)}"

    def _generate_random_statement(
        self,
        group_id: int,
        log_id: int,
        primary_enterprise_name: str,
        primary_account_no: str,
        rng: random.Random,
    ) -> Dict:
        """生成单条随机噪声流水记录。"""
        reference_now = datetime(2026, 3, 18, 9, 0, 0)
        days_ago = rng.randint(0, 365)
        trx_datetime = reference_now - timedelta(days=days_ago, minutes=rng.randint(0, 1439))
        trans_amount = round(rng.uniform(10, 10000), 2)

        if rng.random() > 0.5:
            dr_amount = trans_amount
            cr_amount = 0.0
            trans_flag = "P"
        else:
            cr_amount = trans_amount
            dr_amount = 0.0
            trans_flag = "R"

        customer_name = rng.choice(
            ["小店", "支付宝", "微信支付", "财付通", "美团", "京东", "淘宝", "银行转账"]
        )
        user_memo = rng.choice(
            [
                f"消费_{customer_name}",
                f"转账_{customer_name}",
                f"收款_{customer_name}",
                f"支付_{customer_name}",
                f"退款_{customer_name}",
            ]
        )

        return {
            "accountId": 0,
            "accountMaskNo": primary_account_no,
            "accountingDate": trx_datetime.strftime("%Y-%m-%d"),
            "accountingDateId": int(trx_datetime.strftime("%Y%m%d")),
            "archivingFlag": 0,
            "attachments": 0,
            "balanceAmount": round(rng.uniform(1000, 50000), 2),
            "bank": "ZJRCU",
            "bankComments": "",
            "bankStatementId": 0,
            "bankTrxNumber": "",
            "batchId": log_id,
            "cashType": "1",
            "commentsNum": 0,
            "crAmount": cr_amount,
            "createDate": reference_now.strftime("%Y-%m-%d %H:%M:%S"),
            "createdBy": "902001",
            "cretNo": rng.choice(IDENTITY_CARD_POOL),
            "currency": "CNY",
            "customerAccountMaskNo": str(rng.randint(100000000, 999999999)),
            "customerBank": "",
            "customerId": -1,
            "customerName": customer_name,
            "customerReference": "",
            "downPaymentFlag": 0,
            "drAmount": dr_amount,
            "exceptionType": "",
            "groupId": group_id,
            "internalFlag": 0,
            "leId": 16308,
            "leName": primary_enterprise_name,
            "overrideBsId": 0,
            "paymentMethod": "",
            "sourceCatalogId": 0,
            "split": 0,
            "subBankstatementId": 0,
            "toDoFlag": 0,
            "transAmount": trans_amount,
            "transFlag": trans_flag,
            "transTypeId": 0,
            "transformAmount": 0,
            "transformCrAmount": 0,
            "transformDrAmount": 0,
            "transfromBalanceAmount": 0,
            "trxBalance": 0,
            "trxDate": trx_datetime.strftime("%Y-%m-%d %H:%M:%S"),
            "uploadSequnceNumber": 0,
            "userMemo": user_memo,
        }

    def _assign_statement_ids(self, statements: List[Dict], group_id: int, log_id: int) -> List[Dict]:
        """为样本与噪声流水统一补齐稳定的流水标识。"""
        assigned: List[Dict] = []
        base_id = log_id * 100000
        for index, statement in enumerate(statements, start=1):
            item = dict(statement)
            item["groupId"] = group_id
            item["batchId"] = log_id
            item["bankStatementId"] = base_id + index
            item["bankTrxNumber"] = uuid.uuid5(
                uuid.NAMESPACE_DNS, f"lsfx-mock-{log_id}-{index}"
            ).hex
            item["uploadSequnceNumber"] = index
            item["transAmount"] = round(item.get("drAmount", 0) + item.get("crAmount", 0), 2)
            assigned.append(item)
        return assigned

    def _generate_statements(self, group_id: int, log_id: int, count: int) -> List[Dict]:
        """生成指定数量的流水记录。"""
        primary_enterprise_name, primary_account_no = self._resolve_primary_binding(log_id)
        rng = random.Random(f"statement:{log_id}")
        seeded_statements = build_large_transaction_seed_statements(
            group_id=group_id,
            log_id=log_id,
            primary_enterprise_name=primary_enterprise_name,
            primary_account_no=primary_account_no,
        )

        total_count = max(count, len(seeded_statements))
        statements = list(seeded_statements)
        for _ in range(total_count - len(seeded_statements)):
            statements.append(
                self._generate_random_statement(
                    group_id,
                    log_id,
                    primary_enterprise_name,
                    primary_account_no,
                    rng,
                )
            )

        statements = self._assign_statement_ids(statements, group_id, log_id)
        rng.shuffle(statements)
        return statements

    def _apply_primary_binding(
        self,
        statements: List[Dict],
        primary_enterprise_name: str,
        primary_account_no: str,
    ) -> None:
        """将解析出的主绑定统一回填到已有流水记录。"""
        for statement in statements:
            statement["leName"] = primary_enterprise_name
            statement["accountMaskNo"] = primary_account_no

    def get_bank_statement(self, request: Union[Dict, object]) -> Dict:
        """获取银行流水列表。"""
        if isinstance(request, dict):
            group_id = request.get("groupId", 1000)
            log_id = request.get("logId", 10000)
            page_now = request.get("pageNow", 1)
            page_size = request.get("pageSize", 10)
        else:
            group_id = request.groupId
            log_id = request.logId
            page_now = request.pageNow
            page_size = request.pageSize

        if log_id not in self._cache:
            total_rng = random.Random(f"total:{log_id}")
            total_count = total_rng.randint(1200, 1500)
            all_statements = self._generate_statements(group_id, log_id, total_count)
            self._cache[log_id] = (all_statements, total_count)

        all_statements, total_count = self._cache[log_id]
        primary_enterprise_name, primary_account_no = self._resolve_primary_binding(log_id)
        self._apply_primary_binding(all_statements, primary_enterprise_name, primary_account_no)

        start = (page_now - 1) * page_size
        end = start + page_size
        page_data = all_statements[start:end]

        return {
            "code": "200",
            "data": {"bankStatementList": page_data, "totalCount": total_count},
            "status": "200",
            "successResponse": True,
        }