from sqlalchemy.orm import Session
from app.models.product import Product
from app.models.stock_movement import StockMovement, MovementType
from app.schemas.stock_movement import StockMoveRequest


def register_movement(db: Session, data: StockMoveRequest) -> tuple[StockMovement | None, str]:
    prod = db.query(Product).filter(Product.id == data.product_id).first()
    if not prod:
        return None, "Producto no encontrado"

    movement_type = MovementType(data.type)

    # Validate stock for OUT movements
    if movement_type == MovementType.OUT and prod.current_stock < data.quantity:
        return None, "Stock insuficiente"

    # Update product stock
    if movement_type == MovementType.IN:
        prod.current_stock += data.quantity
    elif movement_type == MovementType.OUT:
        prod.current_stock -= data.quantity
    else:  # ADJUST
        prod.current_stock = data.quantity

    # Record movement
    movement = StockMovement(
        product_id=data.product_id,
        type=movement_type,
        quantity=data.quantity,
        reason=data.reason,
    )
    db.add(movement)
    db.commit()
    db.refresh(movement)
    return movement, ""


def get_product_history(db: Session, product_id: str):
    return db.query(StockMovement).filter(StockMovement.product_id == product_id).all()


def get_stock_summary(db: Session):
    products = db.query(Product).all()
    return [
        {
            "product_id": p.id,
            "product_name": p.name,
            "current_stock": p.current_stock,
            "min_stock": p.min_stock,
            "is_low_stock": p.current_stock < p.min_stock,
        }
        for p in products
    ]