from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field


# Category schemas
class CategoryBase(BaseModel):
    name: str
    description: Optional[str] = None


class CategoryCreate(CategoryBase):
    pass


class CategoryUpdate(CategoryBase):
    name: Optional[str] = None


class CategoryInDBBase(CategoryBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


class Category(CategoryInDBBase):
    pass


# Product schemas
class ProductBase(BaseModel):
    name: str
    description: Optional[str] = None
    price: float = Field(..., gt=0)
    stock: int = Field(0, ge=0)
    image_url: Optional[str] = None
    is_active: bool = True
    category_id: Optional[int] = None


class ProductCreate(ProductBase):
    pass


class ProductUpdate(ProductBase):
    name: Optional[str] = None
    price: Optional[float] = Field(None, gt=0)
    stock: Optional[int] = Field(None, ge=0)
    category_id: Optional[int] = None


class ProductInDBBase(ProductBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


class Product(ProductInDBBase):
    category: Optional[Category] = None


# Product search and filtering
class ProductFilterParams(BaseModel):
    name: Optional[str] = None
    category_id: Optional[int] = None
    min_price: Optional[float] = None
    max_price: Optional[float] = None
    in_stock: Optional[bool] = None