from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field, field_validator


class AdminUserOut(BaseModel):
    id: int
    phone: str
    name: str
    avatar: str = ""
    subject: str = ""
    school: str = ""
    grade: str = ""
    role: str = "teacher"
    is_active: bool = True
    credits: int = 0
    created_at: datetime | None = None

    @field_validator("avatar", "subject", "school", "grade", "name", "role", mode="before")
    @classmethod
    def _none_to_empty(cls, v):
        return "" if v is None else v

    model_config = {"from_attributes": True}


class AdminUserUpdate(BaseModel):
    role: Optional[str] = None
    is_active: Optional[bool] = None
    name: Optional[str] = None


class AdminGrantCredits(BaseModel):
    amount: int = Field(..., gt=0, le=10000, description="积分数量")


class AdminDashboardOut(BaseModel):
    total_users: int = 0
    active_users: int = 0
    admin_users: int = 0
    total_resources: int = 0
    public_resources: int = 0
    total_coursewares: int = 0
    total_animations: int = 0
    total_exercises: int = 0
    total_lesson_plans: int = 0
    total_exams: int = 0
    total_views: int = 0
    total_downloads: int = 0
    total_favorites: int = 0
    total_credits_used: int = 0
    new_users_today: int = 0