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use std::sync::Arc;

use futures::stream::FuturesOrdered;
use futures::StreamExt;
use tokio::select;
use tracing::debug;
use tracing::instrument;

use htsget_config::types::{JsonResponse, Request, Response};
use htsget_search::htsget::HtsGet;

use crate::HtsGetError::InvalidInput;
use crate::{
  convert_to_query, match_format, merge_responses, Endpoint, HtsGetError, PostRequest, Result,
};

/// Gets a JSON response for a GET request. The GET request parameters must
/// be in a HashMap. The "id" field is the only mandatory one. The rest can be
/// consulted [here](https://samtools.github.io/hts-specs/htsget.html)
#[instrument(level = "debug", skip_all, ret)]
pub async fn get(
  searcher: Arc<impl HtsGet + Send + Sync + 'static>,
  request: Request,
  endpoint: Endpoint,
) -> Result<JsonResponse> {
  let format = match_format(&endpoint, request.query().get("format"))?;
  let query = convert_to_query(request, format)?;

  debug!(endpoint = ?endpoint, query = ?query, "getting GET response");

  searcher
    .search(query)
    .await
    .map_err(Into::into)
    .map(JsonResponse::from)
}

/// Gets a response in JSON for a POST request.
/// The parameters can be consulted [here](https://samtools.github.io/hts-specs/htsget.html)
#[instrument(level = "debug", skip_all, ret)]
pub async fn post(
  searcher: Arc<impl HtsGet + Send + Sync + 'static>,
  body: PostRequest,
  request: Request,
  endpoint: Endpoint,
) -> Result<JsonResponse> {
  if !request.query().is_empty() {
    return Err(InvalidInput(
      "query parameters should be empty for a POST request".to_string(),
    ));
  }

  let queries = body.get_queries(request, &endpoint)?;

  debug!(endpoint = ?endpoint, queries = ?queries, "getting POST response");

  let mut futures = FuturesOrdered::new();
  for query in queries {
    let owned_searcher = searcher.clone();
    futures.push_back(tokio::spawn(
      async move { owned_searcher.search(query).await },
    ));
  }
  let mut responses: Vec<Response> = Vec::new();
  loop {
    select! {
      Some(next) = futures.next() => responses.push(next.map_err(|err| HtsGetError::InternalError(err.to_string()))?.map_err(HtsGetError::from)?),
      else => break
    }
  }

  Ok(JsonResponse::from(
    merge_responses(responses).expect("expected at least one response"),
  ))
}