"""customer_relation 客户-投顾关系仓储：数据权限根（仅本人名下客户）+ 客户列表 + AUM 聚合。"""
from __future__ import annotations

from decimal import Decimal

from sqlalchemy import func, or_, select

from model.customer_relation import CustomerRelation
from model.fin_customer_profile import FinCustomerProfile
from model.fin_holdings import FinHoldings
from model.sys_user import SysUser
from repositories.base import BaseRepository

# 持仓中状态：仅统计「持有中」市值，与 service/holdings.py 口径一致（DDL 注释，未入 common_const）
_HOLDING_STATUS = "持有中"


class CustomerRelationRepo(BaseRepository):
    model = CustomerRelation

    async def get_by_customer_advisor(
        self, customer_id: int, advisor_id: int
    ) -> CustomerRelation | None:
        """取指定客户与投顾的关系（数据权限判断用）。"""
        return await self.db.scalar(
            select(CustomerRelation).where(
                CustomerRelation.customer_id == customer_id,
                CustomerRelation.advisor_id == advisor_id,
            )
        )

    async def get_current_by_customer(self, customer_id: int) -> CustomerRelation | None:
        """取客户当前有效关系（历史重分配可能多行，取最近一条，按 id 倒序）。"""
        return await self.db.scalar(
            select(CustomerRelation)
            .where(CustomerRelation.customer_id == customer_id)
            .order_by(CustomerRelation.id.desc())
            .limit(1)
        )

    async def list_by_status(self, status: str) -> list[CustomerRelation]:
        """按状态取全部关系（定时调度遍历 signed 客户用，跨投顾）。"""
        return list(
            (
                await self.db.scalars(
                    select(CustomerRelation).where(CustomerRelation.status == status)
                )
            ).all()
        )

    async def list_by_advisor(
        self, advisor_id: int, status: str | None = None
    ) -> list[CustomerRelation]:
        """名下客户关系列表（status=None 不过滤）。"""
        stmt = select(CustomerRelation).where(CustomerRelation.advisor_id == advisor_id)
        if status:
            stmt = stmt.where(CustomerRelation.status == status)
        return list((await self.db.scalars(stmt)).all())

    async def list_customer_rows(
        self,
        *,
        advisor_id: int,
        status: str | None = None,
        keyword: str | None = None,
        limit: int = 100,
        offset: int = 0,
    ) -> list[tuple[CustomerRelation, SysUser, FinCustomerProfile | None]]:
        """客户列表：关系 + 客户账号 + 画像（左连），返回三元组供 service 拼装响应。"""
        conds = [CustomerRelation.advisor_id == advisor_id]
        if status:
            conds.append(CustomerRelation.status == status)
        if keyword:
            like = f"%{keyword}%"
            conds.append(or_(SysUser.real_name.like(like), SysUser.phone.like(like)))
        stmt = (
            select(CustomerRelation, SysUser, FinCustomerProfile)
            .join(SysUser, SysUser.id == CustomerRelation.customer_id)
            .outerjoin(
                FinCustomerProfile,
                FinCustomerProfile.customer_id == CustomerRelation.customer_id,
            )
            .where(*conds)
            .order_by(CustomerRelation.id.desc())
            .limit(limit)
            .offset(offset)
        )
        return list((await self.db.execute(stmt)).all())

    async def count_customer_rows(
        self,
        *,
        advisor_id: int,
        status: str | None = None,
        keyword: str | None = None,
    ) -> int:
        conds = [CustomerRelation.advisor_id == advisor_id]
        if status:
            conds.append(CustomerRelation.status == status)
        if keyword:
            like = f"%{keyword}%"
            conds.append(or_(SysUser.real_name.like(like), SysUser.phone.like(like)))
        stmt = (
            select(func.count())
            .select_from(CustomerRelation)
            .join(SysUser, SysUser.id == CustomerRelation.customer_id)
            .where(*conds)
        )
        return (await self.db.scalar(stmt)) or 0

    async def risk_level_distribution(
        self, advisor_id: int
    ) -> list[tuple[str | None, int]]:
        """名下客户风险等级分布（C1-C5 各档人数），供驾驶舱客户分层。"""
        stmt = (
            select(FinCustomerProfile.risk_level, func.count())
            .select_from(CustomerRelation)
            .join(
                FinCustomerProfile,
                FinCustomerProfile.customer_id == CustomerRelation.customer_id,
            )
            .where(CustomerRelation.advisor_id == advisor_id)
            .group_by(FinCustomerProfile.risk_level)
        )
        return list((await self.db.execute(stmt)).all())

    async def sum_holdings_value(
        self, advisor_id: int, relation_status: str | None = None
    ) -> Decimal:
        """AUM：名下客户「持有中」持仓当前市值之和（relation_status 过滤，如 signed）。"""
        stmt = (
            select(func.coalesce(func.sum(FinHoldings.current_value), 0))
            .select_from(CustomerRelation)
            .join(FinHoldings, FinHoldings.customer_id == CustomerRelation.customer_id)
            .where(
                CustomerRelation.advisor_id == advisor_id,
                FinHoldings.status == _HOLDING_STATUS,
            )
        )
        if relation_status:
            stmt = stmt.where(CustomerRelation.status == relation_status)
        return await self.db.scalar(stmt)