from typing import Any, List, Optional

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from app import crud, schemas
from app.db.session import get_db

router = APIRouter()


@router.get("/", response_model=List[schemas.Supplier])
def read_suppliers(
    db: Session = Depends(get_db),
    skip: int = 0,
    limit: int = 100,
    name: Optional[str] = None,
) -> Any:
    """
    Retrieve suppliers with optional filtering by name.
    """
    suppliers = crud.supplier.get_multi(db, skip=skip, limit=limit, name=name)
    return suppliers


@router.post("/", response_model=schemas.Supplier, status_code=status.HTTP_201_CREATED)
def create_supplier(
    *,
    db: Session = Depends(get_db),
    supplier_in: schemas.SupplierCreate,
) -> Any:
    """
    Create new supplier.
    """
    supplier = crud.supplier.create(db, obj_in=supplier_in)
    return supplier


@router.get("/{supplier_id}", response_model=schemas.Supplier)
def read_supplier(
    *,
    db: Session = Depends(get_db),
    supplier_id: str,
) -> Any:
    """
    Get supplier by ID.
    """
    supplier = crud.supplier.get(db, supplier_id=supplier_id)
    if not supplier:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Supplier not found",
        )
    return supplier


@router.put("/{supplier_id}", response_model=schemas.Supplier)
def update_supplier(
    *,
    db: Session = Depends(get_db),
    supplier_id: str,
    supplier_in: schemas.SupplierUpdate,
) -> Any:
    """
    Update a supplier.
    """
    supplier = crud.supplier.get(db, supplier_id=supplier_id)
    if not supplier:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Supplier not found",
        )

    supplier = crud.supplier.update(db, db_obj=supplier, obj_in=supplier_in)
    return supplier


@router.delete("/{supplier_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
def delete_supplier(
    *,
    db: Session = Depends(get_db),
    supplier_id: str,
) -> Any:
    """
    Delete a supplier.
    """
    supplier = crud.supplier.get(db, supplier_id=supplier_id)
    if not supplier:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Supplier not found",
        )

    # Check if supplier has products before deleting
    if supplier.products and len(supplier.products) > 0:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Cannot delete supplier with products. Remove or reassign products first.",
        )

    crud.supplier.remove(db, supplier_id=supplier_id)
    return None