#!/usr/bin/env python3
"""Actor stuff."""
import typing
from urllib.parse import urlparse
from sqlalchemy import select
from loguru import logger

import app.activitypub as ap
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 ap.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_object["publicKey"]["publicKeyPem"]
    return public_key