use crate::{objects::check_object_domain, ActorType, FromApub, PersonExt, ToApub};
use activitystreams::{
  actor::{ApActor, Endpoints, Person},
  object::{Image, Tombstone},
  prelude::*,
};
use activitystreams_ext::Ext1;
use anyhow::Context;
use lemmy_db::{
  naive_now,
  user::{UserForm, User_},
  DbPool,
};
use lemmy_utils::{
  location_info,
  utils::{check_slurs, check_slurs_opt, convert_datetime},
  LemmyError,
};
use lemmy_websocket::LemmyContext;
use url::Url;

#[async_trait::async_trait(?Send)]
impl ToApub for User_ {
  type Response = PersonExt;

  // Turn a Lemmy Community into an ActivityPub group that can be sent out over the network.
  async fn to_apub(&self, _pool: &DbPool) -> Result<PersonExt, LemmyError> {
    // TODO go through all these to_string and to_owned()
    let mut person = Person::new();
    person
      .set_context(activitystreams::context())
      .set_id(Url::parse(&self.actor_id)?)
      .set_name(self.name.to_owned())
      .set_published(convert_datetime(self.published));

    if let Some(u) = self.updated {
      person.set_updated(convert_datetime(u));
    }

    if let Some(avatar_url) = &self.avatar {
      let mut image = Image::new();
      image.set_url(Url::parse(avatar_url)?);
      person.set_icon(image.into_any_base()?);
    }

    if let Some(banner_url) = &self.banner {
      let mut image = Image::new();
      image.set_url(Url::parse(banner_url)?);
      person.set_image(image.into_any_base()?);
    }

    if let Some(bio) = &self.bio {
      person.set_summary(bio.to_owned());
    }

    let mut ap_actor = ApActor::new(self.get_inbox_url()?, person);
    ap_actor.set_endpoints(Endpoints {
      shared_inbox: Some(self.get_shared_inbox_url()?),
      ..Default::default()
    });

    if let Some(i) = &self.preferred_username {
      ap_actor.set_preferred_username(i.to_owned());
    }

    Ok(Ext1::new(ap_actor, self.get_public_key_ext()?))
  }
  fn to_tombstone(&self) -> Result<Tombstone, LemmyError> {
    unimplemented!()
  }
}

#[async_trait::async_trait(?Send)]
impl FromApub for UserForm {
  type ApubType = PersonExt;
  /// Parse an ActivityPub person received from another instance into a Lemmy user.
  async fn from_apub(
    person: &PersonExt,
    _context: &LemmyContext,
    expected_domain: Option<Url>,
  ) -> Result<Self, LemmyError> {
    let avatar = match person.icon() {
      Some(any_image) => Some(
        Image::from_any_base(any_image.as_one().context(location_info!())?.clone())?
          .context(location_info!())?
          .url()
          .context(location_info!())?
          .as_single_xsd_any_uri()
          .map(|u| u.to_string()),
      ),
      None => None,
    };

    let banner = match person.image() {
      Some(any_image) => Some(
        Image::from_any_base(any_image.as_one().context(location_info!())?.clone())
          .context(location_info!())?
          .context(location_info!())?
          .url()
          .context(location_info!())?
          .as_single_xsd_any_uri()
          .map(|u| u.to_string()),
      ),
      None => None,
    };

    let name = person
      .name()
      .context(location_info!())?
      .one()
      .context(location_info!())?
      .as_xsd_string()
      .context(location_info!())?
      .to_string();
    let preferred_username = person.inner.preferred_username().map(|u| u.to_string());

    // TODO a limit check (like the API does) might need to be done
    // here when we federate to other platforms. Same for preferred_username
    let bio = person
      .inner
      .summary()
      .map(|s| s.as_single_xsd_string())
      .flatten()
      .map(|s| s.to_string());
    check_slurs(&name)?;
    check_slurs_opt(&preferred_username)?;
    check_slurs_opt(&bio)?;

    Ok(UserForm {
      name,
      preferred_username: Some(preferred_username),
      password_encrypted: "".to_string(),
      admin: false,
      banned: false,
      email: None,
      avatar,
      banner,
      published: person.inner.published().map(|u| u.to_owned().naive_local()),
      updated: person.updated().map(|u| u.to_owned().naive_local()),
      show_nsfw: false,
      theme: "".to_string(),
      default_sort_type: 0,
      default_listing_type: 0,
      lang: "".to_string(),
      show_avatars: false,
      send_notifications_to_email: false,
      matrix_user_id: None,
      actor_id: Some(check_object_domain(person, expected_domain)?),
      bio: Some(bio),
      local: false,
      private_key: None,
      public_key: Some(person.ext_one.public_key.to_owned().public_key_pem),
      last_refreshed_at: Some(naive_now()),
    })
  }
}