#!/usr/bin/env python3
"""Actor stuff."""
import typing
import hy

from urllib.parse import urlparse
from sqlalchemy import select
from loguru import logger

from app.hyap import fetch # type: ignore
from app import models
from app.database import AsyncSession


if typing.TYPE_CHECKING:
    from app.models import Actor as ActorModel


async def fetch_actor(
        db_session: AsyncSession,
        actor_id: str,
) -> "ActorModel":
    """Fetch actor on db, if not exist will be grabed and stored
    in db."""
    exist_actor = (
        await db_session.scalars(
            select(models.Actor).where(
                models.Actor.ap_id == actor_id
            )
        )
    ).one_or_none()

    if exist_actor:
        return exist_actor

    ap_object = await fetch(actor_id)
    exist_actor = await save_actor(ap_object, db_session)
    return exist_actor


async def save_actor(
        ap_object: dict,
        db_session: AsyncSession
) -> "ActorModel":
    """Save actor to db."""
    logger.info("save actor " + ap_object["id"])
    actor = models.Actor(
        ap_id=ap_object["id"],
        ap_actor=ap_object,
        ap_type=ap_object["type"],
        handle=_handle(ap_object),
    )

    db_session.add(actor)
    await db_session.flush()
    await db_session.refresh(actor)
    return actor


def _handle(
        ap_object: dict,
) -> str:
    ap_id = urlparse(ap_object["id"])
    if not ap_id.hostname:
        raise ValueError(f"Invalid actor ID {ap_id}")

    handle = '@' + ap_object["preferredUsername"] + '@' + ap_id.hostname

    return handle


async def get_public_key(
        db_session: AsyncSession,
        key_id: str
) -> str:
    """Give key id and reutrn public key."""
    existing_actor = (
        await db_session.scalars(
            select(models.Actor).where(
                models.Actor.ap_id == key_id.split("#")[0])
        )
    ).one_or_none()
    public_key = existing_actor.ap_actor["publicKey"]["publicKeyPem"]
    return public_key