//! Sends registry requests with current credentials and at most one retry after a 401.
//! Transport failures and other HTTP errors are never replayed here.
//! A deadline before the first transport send remains a retryable unsent request.

use codex_http_client::HttpResponse;
use codex_http_client::Request;
use http::HeaderValue;
use http::StatusCode;
use tokio::time::Instant;
use tokio::time::timeout_at;

use super::EnvironmentRegistryClient;
use super::RegistryAuthMode;
use super::current_trace_context_headers;
use crate::ExecServerError;

pub(super) fn registry_auth_error(error: codex_api::AuthError) -> ExecServerError {
    match error {
        codex_api::AuthError::Transient(_) => ExecServerError::RequestNotSent(
            "environment registry credential resolution is temporarily unavailable".to_string(),
        ),
        error => super::direct::direct_auth_error(error),
    }
}

impl EnvironmentRegistryClient {
    pub(super) async fn send_authenticated(
        &self,
        request: Request,
        deadline: Option<Instant>,
    ) -> Result<(HttpResponse, Option<HeaderValue>), ExecServerError> {
        let request = request
            .into_prepared()
            .map_err(ExecServerError::EnvironmentRegistryConfig)?;
        let mut sent = false;
        let send = async {
            let mut retried = false;
            loop {
                let (authenticated, credential) = if self.auth_mode != RegistryAuthMode::Legacy {
                    let (headers, credential) = self.resolve_auth().await?;
                    let mut authenticated = request.clone();
                    authenticated.headers.extend(headers);
                    (authenticated, credential)
                } else {
                    (
                        self.auth_provider
                            .apply_auth(request.clone())
                            .await
                            .map_err(registry_auth_error)?,
                        None,
                    )
                };
                let prepared = authenticated
                    .prepare_body_for_send()
                    .map_err(ExecServerError::EnvironmentRegistryConfig)?;
                let rejected_headers = prepared.headers.clone();
                let mut outgoing = self
                    .http_for_auth()
                    .request(authenticated.method, authenticated.url)
                    .headers(prepared.headers)
                    .headers(current_trace_context_headers())
                    .body(prepared.body.unwrap_or_default());
                if let Some(timeout) = authenticated.timeout {
                    outgoing = outgoing.timeout(timeout);
                }
                sent = true;
                let response = outgoing.send().await?;
                if !retried
                    && response.status() == StatusCode::UNAUTHORIZED
                    && self
                        .auth_provider
                        .refresh_after_unauthorized(rejected_headers)
                        .await
                {
                    retried = true;
                    continue;
                }
                return Ok((response, credential));
            }
        };
        if let Some(deadline) = deadline {
            match timeout_at(deadline, send).await {
                Ok(result) => result,
                Err(_) if !sent => Err(ExecServerError::RequestNotSent(
                    "environment registry credential resolution timed out".to_string(),
                )),
                Err(_) => Err(ExecServerError::EnvironmentRegistryRequest(
                    codex_http_client::RouteAwareRequestError::Timeout,
                )),
            }
        } else {
            send.await
        }
    }
}

#[cfg(test)]
#[path = "auth_tests.rs"]
mod tests;