use crate::{
  objects::{community::ApubCommunity, person::ApubPerson},
  protocol::objects::{group::Group, person::Person},
  ActorType,
};
use activitypub_federation::traits::{Actor, ApubObject};
use chrono::NaiveDateTime;
use lemmy_api_common::LemmyContext;
use lemmy_utils::error::LemmyError;
use serde::{Deserialize, Serialize};
use url::Url;

#[derive(Clone, Debug)]
pub enum UserOrCommunity {
  User(ApubPerson),
  Community(ApubCommunity),
}

#[derive(Serialize, Deserialize, Clone, Debug)]
#[serde(untagged)]
pub enum PersonOrGroup {
  Person(Person),
  Group(Group),
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
pub enum PersonOrGroupType {
  Person,
  Group,
}

#[async_trait::async_trait(?Send)]
impl ApubObject for UserOrCommunity {
  type DataType = LemmyContext;
  type ApubType = PersonOrGroup;
  type DbType = ();
  type Error = LemmyError;

  fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
    Some(match self {
      UserOrCommunity::User(p) => p.last_refreshed_at,
      UserOrCommunity::Community(p) => p.last_refreshed_at,
    })
  }

  #[tracing::instrument(skip_all)]
  async fn read_from_apub_id(
    object_id: Url,
    data: &Self::DataType,
  ) -> Result<Option<Self>, LemmyError> {
    let person = ApubPerson::read_from_apub_id(object_id.clone(), data).await?;
    Ok(match person {
      Some(o) => Some(UserOrCommunity::User(o)),
      None => ApubCommunity::read_from_apub_id(object_id, data)
        .await?
        .map(UserOrCommunity::Community),
    })
  }

  #[tracing::instrument(skip_all)]
  async fn delete(self, data: &Self::DataType) -> Result<(), LemmyError> {
    match self {
      UserOrCommunity::User(p) => p.delete(data).await,
      UserOrCommunity::Community(p) => p.delete(data).await,
    }
  }

  async fn into_apub(self, _data: &Self::DataType) -> Result<Self::ApubType, LemmyError> {
    unimplemented!()
  }

  #[tracing::instrument(skip_all)]
  async fn verify(
    apub: &Self::ApubType,
    expected_domain: &Url,
    data: &Self::DataType,
    request_counter: &mut i32,
  ) -> Result<(), LemmyError> {
    match apub {
      PersonOrGroup::Person(a) => {
        ApubPerson::verify(a, expected_domain, data, request_counter).await
      }
      PersonOrGroup::Group(a) => {
        ApubCommunity::verify(a, expected_domain, data, request_counter).await
      }
    }
  }

  #[tracing::instrument(skip_all)]
  async fn from_apub(
    apub: Self::ApubType,
    data: &Self::DataType,
    request_counter: &mut i32,
  ) -> Result<Self, LemmyError> {
    Ok(match apub {
      PersonOrGroup::Person(p) => {
        UserOrCommunity::User(ApubPerson::from_apub(p, data, request_counter).await?)
      }
      PersonOrGroup::Group(p) => {
        UserOrCommunity::Community(ApubCommunity::from_apub(p, data, request_counter).await?)
      }
    })
  }
}

impl Actor for UserOrCommunity {
  fn public_key(&self) -> &str {
    match self {
      UserOrCommunity::User(p) => p.public_key(),
      UserOrCommunity::Community(p) => p.public_key(),
    }
  }

  fn inbox(&self) -> Url {
    unimplemented!()
  }
}

impl ActorType for UserOrCommunity {
  fn actor_id(&self) -> Url {
    match self {
      UserOrCommunity::User(u) => u.actor_id(),
      UserOrCommunity::Community(c) => c.actor_id(),
    }
  }

  fn private_key(&self) -> Option<String> {
    match self {
      UserOrCommunity::User(u) => u.private_key(),
      UserOrCommunity::Community(c) => c.private_key(),
    }
  }
}