use crate::PerformCrud;
use actix_web::web::Data;
use lemmy_api_common::{blocking, community::*, get_local_user_view_from_jwt_opt};
use lemmy_apub::{get_actor_id_from_name, objects::community::ApubCommunity};
use lemmy_apub_lib::{object_id::ObjectId, webfinger::WebfingerType};
use lemmy_db_schema::{
  from_opt_str_to_opt_enum,
  traits::DeleteableOrRemoveable,
  ListingType,
  SortType,
};
use lemmy_db_views_actor::{
  community_moderator_view::CommunityModeratorView,
  community_view::{CommunityQueryBuilder, CommunityView},
};
use lemmy_utils::{ApiError, ConnectionId, LemmyError};
use lemmy_websocket::{messages::GetCommunityUsersOnline, LemmyContext};

#[async_trait::async_trait(?Send)]
impl PerformCrud for GetCommunity {
  type Response = GetCommunityResponse;

  async fn perform(
    &self,
    context: &Data<LemmyContext>,
    _websocket_id: Option<ConnectionId>,
  ) -> Result<GetCommunityResponse, LemmyError> {
    let data: &GetCommunity = self;
    let local_user_view =
      get_local_user_view_from_jwt_opt(&data.auth, context.pool(), context.secret()).await?;
    let person_id = local_user_view.map(|u| u.person.id);

    let community_id = match data.id {
      Some(id) => id,
      None => {
        let name = data.name.to_owned().unwrap_or_else(|| "main".to_string());
        let community_actor_id =
          get_actor_id_from_name(WebfingerType::Group, &name, context).await?;

        ObjectId::<ApubCommunity>::new(community_actor_id)
          .dereference(context, &mut 0)
          .await
          .map_err(|e| ApiError::err("couldnt_find_community", e))?
          .id
      }
    };

    let mut community_view = blocking(context.pool(), move |conn| {
      CommunityView::read(conn, community_id, person_id)
    })
    .await?
    .map_err(|e| ApiError::err("couldnt_find_community", e))?;

    // Blank out deleted or removed info for non-logged in users
    if person_id.is_none() && (community_view.community.deleted || community_view.community.removed)
    {
      community_view.community = community_view.community.blank_out_deleted_or_removed_info();
    }

    let moderators: Vec<CommunityModeratorView> = blocking(context.pool(), move |conn| {
      CommunityModeratorView::for_community(conn, community_id)
    })
    .await?
    .map_err(|e| ApiError::err("couldnt_find_community", e))?;

    let online = context
      .chat_server()
      .send(GetCommunityUsersOnline { community_id })
      .await
      .unwrap_or(1);

    let res = GetCommunityResponse {
      community_view,
      moderators,
      online,
    };

    // Return the jwt
    Ok(res)
  }
}

#[async_trait::async_trait(?Send)]
impl PerformCrud for ListCommunities {
  type Response = ListCommunitiesResponse;

  async fn perform(
    &self,
    context: &Data<LemmyContext>,
    _websocket_id: Option<ConnectionId>,
  ) -> Result<ListCommunitiesResponse, LemmyError> {
    let data: &ListCommunities = self;
    let local_user_view =
      get_local_user_view_from_jwt_opt(&data.auth, context.pool(), context.secret()).await?;

    let person_id = local_user_view.to_owned().map(|l| l.person.id);

    // Don't show NSFW by default
    let show_nsfw = match &local_user_view {
      Some(uv) => uv.local_user.show_nsfw,
      None => false,
    };

    let sort: Option<SortType> = from_opt_str_to_opt_enum(&data.sort);
    let listing_type: Option<ListingType> = from_opt_str_to_opt_enum(&data.type_);

    let page = data.page;
    let limit = data.limit;
    let mut communities = blocking(context.pool(), move |conn| {
      CommunityQueryBuilder::create(conn)
        .listing_type(listing_type)
        .sort(sort)
        .show_nsfw(show_nsfw)
        .my_person_id(person_id)
        .page(page)
        .limit(limit)
        .list()
    })
    .await??;

    // Blank out deleted or removed info for non-logged in users
    if person_id.is_none() {
      for cv in communities
        .iter_mut()
        .filter(|cv| cv.community.deleted || cv.community.removed)
      {
        cv.community = cv.to_owned().community.blank_out_deleted_or_removed_info();
      }
    }

    // Return the jwt
    Ok(ListCommunitiesResponse { communities })
  }
}