from pydantic import BaseModel, Field, ConfigDict
from datetime import datetime,date
from typing import Optional, List


class ClassCreate(BaseModel):
    class_name: str = Field(..., max_length=20, description="班级名称，唯一")
    head_teacher_id: int = Field(..., ge=1, description="班主任id")
    counselor_id: Optional[int] = Field(None, description="顾问id")
    create_time: Optional[datetime] = Field(None, description="开课时间，不传默认当前时间")
    teacher_ids: Optional[List[int]] = Field(None, description="绑定授课老师id列表")


class ClassUpdateBase(BaseModel):
    class_name: Optional[str] = Field(None, max_length=20, description="班级名称")
    create_time: Optional[date] = Field(None, description="开课时间，格式 YYYY-MM-DD，不传默认当前日期")
    counselor_id: Optional[int] = Field(None, description="顾问id")


class ClassHeadTeacherUpdate(BaseModel):
    head_teacher_id: int = Field(..., ge=1, description="新的班主任id")


class ClassTeachersUpdate(BaseModel):
    teacher_ids: List[int] = Field(..., description="新老师id列表")


class ClassDelete(BaseModel):
    class_ids: List[int] = Field(..., min_length=1, description="班级id列表")
    deleted: bool = Field(..., description="True 逻辑删除，False 恢复")


class TeacherSimple(BaseModel):
    model_config = ConfigDict(from_attributes=True)
    t_id: int
    t_name: str

class ClassDetail(BaseModel):
    model_config = ConfigDict(from_attributes=True)
    class_id: int
    class_name: str
    head_teacher_id: int
    counselor_id: Optional[int] = None
    create_time: Optional[datetime] = None
    class_delete: bool = False
    teachers: List[TeacherSimple] = []


class ClassPageResult(BaseModel):
    total: int
    items: List[ClassDetail]


class BatchDeleteResult(BaseModel):
    affected_count: int