use crate::{
  check_apub_id_valid_with_strictness,
  fetch_local_site_data,
  generate_outbox_url,
  objects::{instance::fetch_instance_actor_for_object, read_from_string_or_source_opt},
  protocol::{
    objects::{
      person::{Person, UserTypes},
      Endpoints,
    },
    ImageObject,
    Source,
  },
  ActorType,
};
use activitypub_federation::{
  core::object_id::ObjectId,
  traits::{Actor, ApubObject},
  utils::verify_domains_match,
};
use chrono::NaiveDateTime;
use lemmy_api_common::utils::local_site_opt_to_slur_regex;
use lemmy_db_schema::{
  source::{
    instance::Instance,
    person::{Person as DbPerson, PersonInsertForm, PersonUpdateForm},
  },
  traits::{ApubActor, Crud},
  utils::naive_now,
};
use lemmy_utils::{
  error::LemmyError,
  utils::{check_slurs, check_slurs_opt, convert_datetime, markdown_to_html},
};
use lemmy_websocket::LemmyContext;
use std::ops::Deref;
use url::Url;

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ApubPerson(pub(crate) DbPerson);

impl Deref for ApubPerson {
  type Target = DbPerson;
  fn deref(&self) -> &Self::Target {
    &self.0
  }
}

impl From<DbPerson> for ApubPerson {
  fn from(p: DbPerson) -> Self {
    ApubPerson(p)
  }
}

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

  fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
    Some(self.last_refreshed_at)
  }

  #[tracing::instrument(skip_all)]
  async fn read_from_apub_id(
    object_id: Url,
    context: &LemmyContext,
  ) -> Result<Option<Self>, LemmyError> {
    Ok(
      DbPerson::read_from_apub_id(context.pool(), &object_id.into())
        .await?
        .map(Into::into),
    )
  }

  #[tracing::instrument(skip_all)]
  async fn delete(self, context: &LemmyContext) -> Result<(), LemmyError> {
    let form = PersonUpdateForm::builder().deleted(Some(true)).build();
    DbPerson::update(context.pool(), self.id, &form).await?;
    Ok(())
  }

  #[tracing::instrument(skip_all)]
  async fn into_apub(self, _pool: &LemmyContext) -> Result<Person, LemmyError> {
    let kind = if self.bot_account {
      UserTypes::Service
    } else {
      UserTypes::Person
    };

    let person = Person {
      kind,
      id: ObjectId::new(self.actor_id.clone()),
      preferred_username: self.name.clone(),
      name: self.display_name.clone(),
      summary: self.bio.as_ref().map(|b| markdown_to_html(b)),
      source: self.bio.clone().map(Source::new),
      icon: self.avatar.clone().map(ImageObject::new),
      image: self.banner.clone().map(ImageObject::new),
      matrix_user_id: self.matrix_user_id.clone(),
      published: Some(convert_datetime(self.published)),
      outbox: generate_outbox_url(&self.actor_id)?.into(),
      endpoints: self.shared_inbox_url.clone().map(|s| Endpoints {
        shared_inbox: s.into(),
      }),
      public_key: self.get_public_key(),
      updated: self.updated.map(convert_datetime),
      inbox: self.inbox_url.clone().into(),
    };
    Ok(person)
  }

  #[tracing::instrument(skip_all)]
  async fn verify(
    person: &Person,
    expected_domain: &Url,
    context: &LemmyContext,
    _request_counter: &mut i32,
  ) -> Result<(), LemmyError> {
    let local_site_data = fetch_local_site_data(context.pool()).await?;
    let slur_regex = &local_site_opt_to_slur_regex(&local_site_data.local_site);

    check_slurs(&person.preferred_username, slur_regex)?;
    check_slurs_opt(&person.name, slur_regex)?;

    verify_domains_match(person.id.inner(), expected_domain)?;
    check_apub_id_valid_with_strictness(
      person.id.inner(),
      false,
      &local_site_data,
      context.settings(),
    )?;

    let bio = read_from_string_or_source_opt(&person.summary, &None, &person.source);
    check_slurs_opt(&bio, slur_regex)?;
    Ok(())
  }

  #[tracing::instrument(skip_all)]
  async fn from_apub(
    person: Person,
    context: &LemmyContext,
    request_counter: &mut i32,
  ) -> Result<ApubPerson, LemmyError> {
    let apub_id = person.id.inner().clone();
    let instance = Instance::create_from_actor_id(context.pool(), &apub_id).await?;

    let person_form = PersonInsertForm {
      name: person.preferred_username,
      display_name: person.name,
      banned: None,
      ban_expires: None,
      deleted: Some(false),
      avatar: person.icon.map(|i| i.url.into()),
      banner: person.image.map(|i| i.url.into()),
      published: person.published.map(|u| u.naive_local()),
      updated: person.updated.map(|u| u.naive_local()),
      actor_id: Some(person.id.into()),
      bio: read_from_string_or_source_opt(&person.summary, &None, &person.source),
      local: Some(false),
      admin: Some(false),
      bot_account: Some(person.kind == UserTypes::Service),
      private_key: None,
      public_key: person.public_key.public_key_pem,
      last_refreshed_at: Some(naive_now()),
      inbox_url: Some(person.inbox.into()),
      shared_inbox_url: person.endpoints.map(|e| e.shared_inbox.into()),
      matrix_user_id: person.matrix_user_id,
      instance_id: instance.id,
    };
    let person = DbPerson::create(context.pool(), &person_form).await?;

    let actor_id = person.actor_id.clone().into();
    fetch_instance_actor_for_object(actor_id, context, request_counter).await;

    Ok(person.into())
  }
}

impl ActorType for ApubPerson {
  fn actor_id(&self) -> Url {
    self.actor_id.clone().into()
  }

  fn private_key(&self) -> Option<String> {
    self.private_key.clone()
  }
}

impl Actor for ApubPerson {
  fn public_key(&self) -> &str {
    &self.public_key
  }

  fn inbox(&self) -> Url {
    self.inbox_url.clone().into()
  }

  fn shared_inbox(&self) -> Option<Url> {
    self.shared_inbox_url.clone().map(Into::into)
  }
}

#[cfg(test)]
pub(crate) mod tests {
  use super::*;
  use crate::{
    objects::{
      instance::{tests::parse_lemmy_instance, ApubSite},
      tests::init_context,
    },
    protocol::{objects::instance::Instance, tests::file_to_json_object},
  };
  use lemmy_db_schema::{source::site::Site, traits::Crud};
  use serial_test::serial;

  pub(crate) async fn parse_lemmy_person(context: &LemmyContext) -> (ApubPerson, ApubSite) {
    let site = parse_lemmy_instance(context).await;
    let json = file_to_json_object("assets/lemmy/objects/person.json").unwrap();
    let url = Url::parse("https://enterprise.lemmy.ml/u/picard").unwrap();
    let mut request_counter = 0;
    ApubPerson::verify(&json, &url, context, &mut request_counter)
      .await
      .unwrap();
    let person = ApubPerson::from_apub(json, context, &mut request_counter)
      .await
      .unwrap();
    assert_eq!(request_counter, 0);
    (person, site)
  }

  #[actix_rt::test]
  #[serial]
  async fn test_parse_lemmy_person() {
    let context = init_context().await;
    let (person, site) = parse_lemmy_person(&context).await;

    assert_eq!(person.display_name, Some("Jean-Luc Picard".to_string()));
    assert!(!person.local);
    assert_eq!(person.bio.as_ref().unwrap().len(), 39);

    cleanup((person, site), &context).await;
  }

  #[actix_rt::test]
  #[serial]
  async fn test_parse_pleroma_person() {
    let context = init_context().await;

    // create and parse a fake pleroma instance actor, to avoid network request during test
    let mut json: Instance = file_to_json_object("assets/lemmy/objects/instance.json").unwrap();
    let id = Url::parse("https://queer.hacktivis.me/").unwrap();
    json.id = ObjectId::new(id);
    let mut request_counter = 0;
    let site = ApubSite::from_apub(json, &context, &mut request_counter)
      .await
      .unwrap();

    let json = file_to_json_object("assets/pleroma/objects/person.json").unwrap();
    let url = Url::parse("https://queer.hacktivis.me/users/lanodan").unwrap();
    let mut request_counter = 0;
    ApubPerson::verify(&json, &url, &context, &mut request_counter)
      .await
      .unwrap();
    let person = ApubPerson::from_apub(json, &context, &mut request_counter)
      .await
      .unwrap();

    assert_eq!(person.actor_id, url.into());
    assert_eq!(person.name, "lanodan");
    assert!(!person.local);
    assert_eq!(request_counter, 0);
    assert_eq!(person.bio.as_ref().unwrap().len(), 873);

    cleanup((person, site), &context).await;
  }

  async fn cleanup(data: (ApubPerson, ApubSite), context: &LemmyContext) {
    DbPerson::delete(context.pool(), data.0.id).await.unwrap();
    Site::delete(context.pool(), data.1.id).await.unwrap();
  }
}