from typing import List

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

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

router = APIRouter()


@router.get("/", response_model=List[schemas.Item])
def read_items(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    """
    Retrieve items with pagination.
    """
    items = db.query(models.Item).offset(skip).limit(limit).all()
    return items


@router.post("/", response_model=schemas.Item, status_code=status.HTTP_201_CREATED)
def create_item(item_in: schemas.ItemCreate, db: Session = Depends(get_db)):
    """
    Create new item.
    """
    item = models.Item(**item_in.model_dump())
    db.add(item)
    db.commit()
    db.refresh(item)
    return item


@router.get("/{item_id}", response_model=schemas.Item)
def read_item(item_id: int, db: Session = Depends(get_db)):
    """
    Get item by ID.
    """
    item = db.query(models.Item).filter(models.Item.id == item_id).first()
    if item is None:
        raise HTTPException(status_code=404, detail="Item not found")
    return item


@router.put("/{item_id}", response_model=schemas.Item)
def update_item(item_id: int, item_in: schemas.ItemUpdate, db: Session = Depends(get_db)):
    """
    Update an item.
    """
    item = db.query(models.Item).filter(models.Item.id == item_id).first()
    if item is None:
        raise HTTPException(status_code=404, detail="Item not found")

    update_data = item_in.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(item, field, value)

    db.add(item)
    db.commit()
    db.refresh(item)
    return item


@router.delete("/{item_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
def delete_item(item_id: int, db: Session = Depends(get_db)):
    """
    Delete an item.
    """
    item = db.query(models.Item).filter(models.Item.id == item_id).first()
    if item is None:
        raise HTTPException(status_code=404, detail="Item not found")

    db.delete(item)
    db.commit()
    return None