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use r2d2;
use std::cell::RefCell;

use crate::cluster::{GetCompressor, GetConnection};
use crate::error;
use crate::frame::{Frame, IntoBytes};
use crate::transport::CDRSTransport;
use crate::types::CBytesShort;

use super::utils::{prepare_flags, send_frame};

pub type PreparedQuery = CBytesShort;

pub trait PrepareExecutor<
  T: CDRSTransport + 'static,
  M: r2d2::ManageConnection<Connection = RefCell<T>, Error = error::Error> + Sized,
>: GetConnection<T, M> + GetCompressor<'static>
{
  /// It prepares a query for execution, along with query itself
  /// the method takes `with_tracing` and `with_warnings` flags
  /// to get tracing information and warnings.
  fn prepare_tw<Q: ToString>(
    &self,
    query: Q,
    with_tracing: bool,
    with_warnings: bool,
  ) -> error::Result<PreparedQuery>
  where
    Self: Sized,
  {
    let flags = prepare_flags(with_tracing, with_warnings);

    let query_frame = Frame::new_req_prepare(query.to_string(), flags).into_cbytes();

    send_frame(self, query_frame)
      .and_then(|response| response.get_body())
      .and_then(|body| {
        Ok(
          body
            .into_prepared()
            .expect("CDRS BUG: cannot convert frame into prepared")
            .id,
        )
      })
  }

  /// It prepares query without additional tracing information and warnings.
  fn prepare<Q: ToString>(&self, query: Q) -> error::Result<PreparedQuery>
  where
    Self: Sized,
  {
    self.prepare_tw(query, false, false)
  }
}