"""学生模块出入参（需求 2.1）。"""

from __future__ import annotations

from datetime import date
from typing import Any

from pydantic import BaseModel, Field, field_validator, model_validator

from app.model.constants import Education
from app.schema.common import GENDER_VALIDATOR, ORMBase, STRIP_VALIDATOR


class _StudentBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=30, description="姓名")
    gender: int = Field(1, description="性别 1=男 2=女（也接受 男/女）")

    birth_date: str | None = Field(None, description="出生日期 YYYY-MM-DD")
    age: int | None = Field(
        None, ge=10, le=80,
        description="年龄。只在拿不到生日时用：填了 age 没填 birth_date，系统按当年推算一个占位生日",
    )

    native_place: str | None = Field(None, max_length=60, description="籍贯")
    graduate_school: str | None = Field(None, max_length=80, description="毕业院校")
    major: str | None = Field(None, max_length=60, description="专业")
    education: str | None = Field(None, max_length=20, description="学历，如 大专/本科", examples=[Education.BACHELOR.value])

    enroll_date: str | None = Field(None, description="入学时间 YYYY-MM-DD")
    graduate_date: str | None = Field(None, description="毕业时间 YYYY-MM-DD")

    phone: str | None = Field(None, max_length=20, description="联系电话")
    id_card: str | None = Field(None, max_length=30, description="身份证号")

    class_id: int | None = Field(None, description="所属班级ID")
    advisor_id: int | None = Field(None, description="顾问ID")

    remark: str | None = Field(None, description="备注")

    _v_gender = GENDER_VALIDATOR
    _v_strip = STRIP_VALIDATOR

    @field_validator("birth_date", "enroll_date", "graduate_date", mode="before")
    @classmethod
    def _date_like(cls, v):  # noqa: ANN001, ANN201
        """把 date/datetime 统一成 str，真正的解析放在 API 层用 parse_date。"""
        if v is None or isinstance(v, str):
            return v
        if isinstance(v, date):
            return v.isoformat()
        return v


class StudentCreate(_StudentBase):
    stu_no: str | None = Field(None, max_length=30, description="学号。不传则按规则自动生成")
    status: int | None = Field(None, ge=1, le=3, description="状态 1=在读 2=进入就业 3=已就业，默认在读")

    @model_validator(mode="after")
    def _check_age_source(self):
        if self.birth_date is None and self.age is None:
            raise ValueError("birth_date 和 age 至少要填一个（用于年龄统计）")
        return self


class StudentUpdate(BaseModel):
    """全部字段可选，只更新传了的字段。"""

    name: str | None = Field(None, min_length=1, max_length=30, description="姓名")
    gender: int | None = Field(None, description="性别 1=男 2=女")
    birth_date: str | None = Field(None, description="出生日期 YYYY-MM-DD")
    age: int | None = Field(None, description="年龄（会折算成占位生日）")

    native_place: str | None = Field(None, max_length=60, description="籍贯")
    graduate_school: str | None = Field(None, max_length=80, description="毕业院校")
    major: str | None = Field(None, max_length=60, description="专业")
    education: str | None = Field(None, max_length=20, description="学历")

    enroll_date: str | None = Field(None, description="入学时间 YYYY-MM-DD")
    graduate_date: str | None = Field(None, description="毕业时间 YYYY-MM-DD")

    phone: str | None = Field(None, max_length=20, description="联系电话")
    id_card: str | None = Field(None, max_length=30, description="身份证号")

    class_id: int | None = Field(None, description="所属班级ID（转班会同步就业表的冗余班级）")
    advisor_id: int | None = Field(None, description="顾问ID")

    remark: str | None = Field(None, description="备注")

    _v_gender = GENDER_VALIDATOR
    _v_strip = STRIP_VALIDATOR


class StudentBrief(ORMBase):
    id: int
    stu_no: str
    name: str
    gender_text: str | None = None
    class_name: str | None = None
    status_text: str


class StudentOut(ORMBase):
    id: int
    stu_no: str = Field(..., description="学号")
    name: str
    gender: int
    gender_text: str | None = Field(None, description="性别文案")
    age: int | None = Field(None, description="年龄（按出生日期实时计算）")
    birth_date: date | None = None
    birth_date_estimated: int = Field(0, description="生日是否为推算值 1=是")

    native_place: str | None = None
    graduate_school: str | None = None
    major: str | None = None
    education: str | None = None

    enroll_date: date | None = None
    graduate_date: date | None = None

    phone: str | None = None
    id_card: str | None = None

    class_id: int | None = None
    class_no: str | None = Field(None, description="班级编号")
    class_name: str | None = Field(None, description="班级名称（JOIN 得出）")
    advisor_id: int | None = None
    advisor_name: str | None = None

    status: int
    status_text: str
    remark: str | None = None

    score_count: int = Field(0, description="已录入的考核次数")
    avg_score: float | None = Field(None, description="平均分")
    fail_count: int = Field(0, description="低于红线的次数")


class StudentImportResult(BaseModel):
    total: int = Field(0, description="文件里的数据行数")
    success: int = Field(0, description="成功导入")
    failed: int = Field(0, description="失败行数")
    errors: list[dict[str, Any]] = Field(default_factory=list, description="失败明细：行号 + 原因")