use crate::{
  activities::{
    community::{announce::GetCommunity, send_activity_in_community},
    generate_activity_id,
    verify_activity,
    verify_is_public,
    verify_mod_action,
    verify_person_in_community,
  },
  activity_lists::AnnouncableActivities,
  objects::{community::ApubCommunity, person::ApubPerson},
  protocol::activities::community::{
    block_user::BlockUserFromCommunity,
    undo_block_user::UndoBlockUserFromCommunity,
  },
};
use activitystreams_kinds::{activity::UndoType, public};
use lemmy_api_common::blocking;
use lemmy_apub_lib::{
  data::Data,
  object_id::ObjectId,
  traits::{ActivityHandler, ActorType},
};
use lemmy_db_schema::{
  source::community::{CommunityPersonBan, CommunityPersonBanForm},
  traits::Bannable,
};
use lemmy_utils::LemmyError;
use lemmy_websocket::LemmyContext;

impl UndoBlockUserFromCommunity {
  #[tracing::instrument(skip_all)]
  pub async fn send(
    community: &ApubCommunity,
    target: &ApubPerson,
    actor: &ApubPerson,
    context: &LemmyContext,
  ) -> Result<(), LemmyError> {
    let block = BlockUserFromCommunity::new(community, target, actor, context)?;

    let id = generate_activity_id(
      UndoType::Undo,
      &context.settings().get_protocol_and_hostname(),
    )?;
    let undo = UndoBlockUserFromCommunity {
      actor: ObjectId::new(actor.actor_id()),
      to: vec![public()],
      object: block,
      cc: vec![community.actor_id()],
      kind: UndoType::Undo,
      id: id.clone(),
      unparsed: Default::default(),
    };

    let activity = AnnouncableActivities::UndoBlockUserFromCommunity(undo);
    let inboxes = vec![target.shared_inbox_or_inbox_url()];
    send_activity_in_community(activity, &id, actor, community, inboxes, context).await
  }
}

#[async_trait::async_trait(?Send)]
impl ActivityHandler for UndoBlockUserFromCommunity {
  type DataType = LemmyContext;

  #[tracing::instrument(skip_all)]
  async fn verify(
    &self,
    context: &Data<LemmyContext>,
    request_counter: &mut i32,
  ) -> Result<(), LemmyError> {
    verify_is_public(&self.to, &self.cc)?;
    verify_activity(&self.id, self.actor.inner(), &context.settings())?;
    let community = self.get_community(context, request_counter).await?;
    verify_person_in_community(&self.actor, &community, context, request_counter).await?;
    verify_mod_action(&self.actor, &community, context, request_counter).await?;
    self.object.verify(context, request_counter).await?;
    Ok(())
  }

  #[tracing::instrument(skip_all)]
  async fn receive(
    self,
    context: &Data<LemmyContext>,
    request_counter: &mut i32,
  ) -> Result<(), LemmyError> {
    let community = self.get_community(context, request_counter).await?;
    let blocked_user = self
      .object
      .object
      .dereference(context, request_counter)
      .await?;

    let community_user_ban_form = CommunityPersonBanForm {
      community_id: community.id,
      person_id: blocked_user.id,
    };

    blocking(context.pool(), move |conn: &'_ _| {
      CommunityPersonBan::unban(conn, &community_user_ban_form)
    })
    .await??;

    Ok(())
  }
}

#[async_trait::async_trait(?Send)]
impl GetCommunity for UndoBlockUserFromCommunity {
  #[tracing::instrument(skip_all)]
  async fn get_community(
    &self,
    context: &LemmyContext,
    request_counter: &mut i32,
  ) -> Result<ApubCommunity, LemmyError> {
    self.object.get_community(context, request_counter).await
  }
}