from fastapi import APIRouter, status, Path, Depends, HTTPException
from sqlmodel import select, Session

from src import database
from src.models.models import Record, RecordRead, RecordCreate

router = APIRouter(prefix="/records", tags=["Records"])


@router.get("/", response_model=list[RecordRead], summary="Get a list of all records")
async def all_records(
        *,
        session: Session = Depends(database.get_session)
) -> list[Record]:
    """Returns a list of all records."""

    records = session.exec(select(Record)).all()
    return records


@router.post("/", status_code=status.HTTP_201_CREATED)
async def add_record(
        *,
        record: RecordCreate,
        session: Session = Depends(database.get_session)
):
    """Start a record."""

    db_record = Record.from_orm(record)
    session.add(db_record)
    session.commit()
    session.refresh(db_record)
    return db_record


@router.get("/{id}", response_model=RecordRead)
async def get_record(
        *,
        id: str = Path(..., title="ID of the record"),
        session: Session = Depends(database.get_session)
) -> Record:
    """Fetch a record by id."""

    record = session.get(Record, id)
    if not record:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
    return record


@router.delete("/{id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_record(
        *,
        id: str = Path(..., title="ID of the record"),
        session: Session = Depends(database.get_session)
):
    """Delete a record specified by id."""

    record = session.get(Record, id)
    if not record:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
    session.delete(record)
    session.commit()
    # TODO: This method implicitly returns None, which will be converted to null by FastAPI, which triggers a
    #  warning, because the method returns with header HTTP_204_NO_CONTENT, but has content


@router.patch("/{id}", summary="Apply partial updates to a record by id")
async def patch_record(
        *,
        record: RecordCreate,
        id: str = Path(..., title="ID of the record"),
        session: Session = Depends(database.get_session)
):
    """Apply partial updates to a record."""

    # Fetch record by id from database
    db_record = session.get(Record, id)
    if not db_record:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)

    # Set all provided arguments in the database record
    for key, value in record.dict(exclude_unset=True).items():
        setattr(db_record, key, value)

    # Write modified record to database
    session.add(db_record)
    session.commit()
    session.refresh(db_record)
    return db_record