import re
from datetime import datetime
from typing import List, Optional

from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator


# Stock Models
class StockBase(BaseModel):
    gtin: str = Field(..., min_length=1, description="GTIN is required")
    location: str = Field(..., min_length=1, description="Location is required")


class StockCreate(StockBase):
    quantity: int = Field(ge=0, description="Quantity must be non-negative")


class StockAdd(StockBase):
    quantity: int = Field(gt=0, description="Quantity to add must be positive")


class StockUpdate(BaseModel):
    quantity: int = Field(ge=0, description="Quantity must be non-negative")


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