"""客户评级等级配置接口（需求 2.2.5）。

评级计算器的等级映射判定表：判定按 sort_order 升序取首个 min_score ≤ 总分
的等级，max_score 仅展示。区间合法（0≤min≤max≤100）与互不重叠由后端校验
—— 前端表单只是展示约束，后端校验是唯一防线。

列表不分页全量返回：等级映射是判定表，数量个位数，分页无意义。
业务数据属业务操作，登录用户即可访问（区别于系统管理模块的 AdminUser）；
写操作经 RequestMetaDep 带入请求元信息，由 service 层写入操作日志。
"""

from typing import Annotated

from fastapi import APIRouter, Depends, Path

from app.api.deps import DbSession, PayrollWriter, RequestMetaDep, get_current_user
from app.core.response import ApiResponse, ok
from app.models import User
from app.schemas.rating import RatingGradeCreateIn, RatingGradeOut, RatingGradeUpdateIn
from app.services import rating_service

CurrentUser = Annotated[User, Depends(get_current_user)]

router = APIRouter(prefix="/rating-grades", tags=["客户评级"])


@router.get("", response_model=ApiResponse[list[RatingGradeOut]], summary="评级等级列表")
def list_grades(
    session: DbSession,
    _: CurrentUser,
) -> ApiResponse[list[RatingGradeOut]]:
    """全量等级列表，按判定顺序（sort_order 升序）返回，不分页。"""
    return ok(rating_service.list_grades(session))


@router.post("", response_model=ApiResponse[RatingGradeOut], summary="新增评级等级")
def create_grade(
    session: DbSession,
    current_user: PayrollWriter,
    payload: RatingGradeCreateIn,
    meta: RequestMetaDep,
) -> ApiResponse[RatingGradeOut]:
    """新增评级等级。区间须 0≤min≤max≤100 且与既有等级不重叠。"""
    return ok(
        rating_service.create_grade(session, payload, operator=current_user, meta=meta),
        message="评级等级已创建",
    )


@router.put("/{grade_id}", response_model=ApiResponse[RatingGradeOut], summary="编辑评级等级")
def update_grade(
    session: DbSession,
    current_user: PayrollWriter,
    grade_id: Annotated[int, Path(ge=1)],
    payload: RatingGradeUpdateIn,
    meta: RequestMetaDep,
) -> ApiResponse[RatingGradeOut]:
    """编辑评级等级（全量替换）。区间须合法且与其他等级不重叠。"""
    return ok(
        rating_service.update_grade(session, grade_id, payload, operator=current_user, meta=meta),
        message="已保存",
    )


@router.delete("/{grade_id}", response_model=ApiResponse[None], summary="删除评级等级")
def delete_grade(
    session: DbSession,
    current_user: PayrollWriter,
    grade_id: Annotated[int, Path(ge=1)],
    meta: RequestMetaDep,
) -> ApiResponse[None]:
    """物理删除评级等级（等级表无下游引用，允许清空，理由见 service 说明）。"""
    rating_service.delete_grade(session, grade_id, operator=current_user, meta=meta)
    return ok(message="评级等级已删除")