# stock.py - Remove business logic validation constraints
from datetime import datetime
from typing import List, Optional
from pydantic import BaseModel, ConfigDict, Field

class StockBase(BaseModel):
    gtin: str = Field(..., description="GTIN identifier")
    location: str = Field(..., description="Storage location")

class StockCreate(StockBase):
    quantity: int = Field(..., description="Initial stock quantity")
    # Removed: ge=0 constraint - let service handle negative validation

class StockAdd(StockBase):
    quantity: int = Field(..., description="Quantity to add/remove")
    # Removed: gt=0 constraint - let service handle zero/negative validation

class StockUpdate(BaseModel):
    quantity: int = Field(..., description="New stock quantity")
    # Removed: ge=0 constraint - let service handle negative validation

class StockResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)
    id: int
    gtin: str
    location: str
    quantity: int
    created_at: datetime
    updated_at: datetime

class StockLocationResponse(BaseModel):
    location: str
    quantity: int

class StockSummaryResponse(BaseModel):
    gtin: str
    total_quantity: int
    locations: List[StockLocationResponse]
    product_title: Optional[str] = None