"""FastAPI CRUD — kaksi endpoint-settiä, Author ja Post."""

from fastapi import FastAPI, Depends, HTTPException
from sqlalchemy.orm import Session

from models import SessionLocal, Author, Post
from schemas import AuthorCreate, AuthorResponse, PostCreate, PostResponse

app = FastAPI()


def get_db():
    """Tietokantasessio per pyyntö."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


# --- Author ---


@app.post("/authors/", response_model=AuthorResponse, status_code=201)
def create_author(item: AuthorCreate, db: Session = Depends(get_db)):
    db_item = Author(**item.model_dump())
    db.add(db_item)
    db.commit()
    db.refresh(db_item)
    return db_item


@app.get("/authors/", response_model=list[AuthorResponse])
def list_authors(db: Session = Depends(get_db)):
    return db.query(Author).all()


@app.get("/authors/{item_id}", response_model=AuthorResponse)
def get_author(item_id: int, db: Session = Depends(get_db)):
    item = db.query(Author).filter(Author.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Author not found")
    return item


@app.put("/authors/{item_id}", response_model=AuthorResponse)
def update_author(item_id: int, item: AuthorCreate, db: Session = Depends(get_db)):
    db_item = db.query(Author).filter(Author.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Author not found")
    for key, value in item.model_dump().items():
        setattr(db_item, key, value)
    db.commit()
    db.refresh(db_item)
    return db_item


@app.delete("/authors/{item_id}", status_code=204)
def delete_author(item_id: int, db: Session = Depends(get_db)):
    db_item = db.query(Author).filter(Author.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Author not found")
    db.delete(db_item)
    db.commit()


# --- Post ---


@app.post("/posts/", response_model=PostResponse, status_code=201)
def create_post(item: PostCreate, db: Session = Depends(get_db)):
    db_item = Post(**item.model_dump())
    db.add(db_item)
    db.commit()
    db.refresh(db_item)
    return db_item


@app.get("/posts/", response_model=list[PostResponse])
def list_posts(db: Session = Depends(get_db)):
    return db.query(Post).all()


@app.get("/posts/{item_id}", response_model=PostResponse)
def get_post(item_id: int, db: Session = Depends(get_db)):
    item = db.query(Post).filter(Post.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Post not found")
    return item


@app.put("/posts/{item_id}", response_model=PostResponse)
def update_post(item_id: int, item: PostCreate, db: Session = Depends(get_db)):
    db_item = db.query(Post).filter(Post.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Post not found")
    for key, value in item.model_dump().items():
        setattr(db_item, key, value)
    db.commit()
    db.refresh(db_item)
    return db_item


@app.delete("/posts/{item_id}", status_code=204)
def delete_post(item_id: int, db: Session = Depends(get_db)):
    db_item = db.query(Post).filter(Post.id == item_id).first()
    if not db_item:
        raise HTTPException(status_code=404, detail="Post not found")
    db.delete(db_item)
    db.commit()