from pydantic import BaseModel
from datetime import datetime
from typing import Optional

class UserBase(BaseModel):
    username: str
    email: str

class UserCreate(UserBase):
    password: str

class User(UserBase):
    id: int
    is_active: bool
    created_at: datetime

    class Config:
        from_attributes = True

class APIKeyBase(BaseModel):
    name: str

class APIKeyCreate(APIKeyBase):
    user_id: int

class APIKey(APIKeyBase):
    id: int
    key: str
    user_id: int
    is_active: bool
    created_at: datetime

    class Config:
        from_attributes = True

class QuotaBase(BaseModel):
    daily_tokens: Optional[int] = None
    monthly_tokens: Optional[int] = None
    daily_requests: Optional[int] = None
    monthly_requests: Optional[int] = None

class QuotaCreate(QuotaBase):
    user_id: int

class Quota(QuotaBase):
    id: int
    user_id: int
    reset_at: Optional[datetime] = None

    class Config:
        from_attributes = True

class UsageStats(BaseModel):
    tokens_used: int = 0
    requests_count: int = 0
    last_reset: Optional[datetime] = None

    class Config:
        from_attributes = True