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//! Adds async IO support to redis.
use crate::cmd::{cmd, Cmd};
use crate::connection::RedisConnectionInfo;
use crate::types::{ErrorKind, RedisFuture, RedisResult, Value};
use ::tokio::io::{AsyncRead, AsyncWrite};
use async_trait::async_trait;
use futures_util::Future;
use std::net::SocketAddr;
#[cfg(unix)]
use std::path::Path;
use std::pin::Pin;

/// Enables the async_std compatibility
#[cfg(feature = "async-std-comp")]
#[cfg_attr(docsrs, doc(cfg(feature = "async-std-comp")))]
pub mod async_std;

#[cfg(feature = "tls-rustls")]
use crate::tls::TlsConnParams;

#[cfg(all(feature = "tls-native-tls", not(feature = "tls-rustls")))]
use crate::connection::TlsConnParams;

/// Enables the tokio compatibility
#[cfg(feature = "tokio-comp")]
#[cfg_attr(docsrs, doc(cfg(feature = "tokio-comp")))]
pub mod tokio;

/// Represents the ability of connecting via TCP or via Unix socket
#[async_trait]
pub(crate) trait RedisRuntime: AsyncStream + Send + Sync + Sized + 'static {
    /// Performs a TCP connection
    async fn connect_tcp(socket_addr: SocketAddr) -> RedisResult<Self>;

    // Performs a TCP TLS connection
    #[cfg(any(feature = "tls-native-tls", feature = "tls-rustls"))]
    async fn connect_tcp_tls(
        hostname: &str,
        socket_addr: SocketAddr,
        insecure: bool,
        tls_params: &Option<TlsConnParams>,
    ) -> RedisResult<Self>;

    /// Performs a UNIX connection
    #[cfg(unix)]
    async fn connect_unix(path: &Path) -> RedisResult<Self>;

    fn spawn(f: impl Future<Output = ()> + Send + 'static);

    fn boxed(self) -> Pin<Box<dyn AsyncStream + Send + Sync>> {
        Box::pin(self)
    }
}

/// Trait for objects that implements `AsyncRead` and `AsyncWrite`
pub trait AsyncStream: AsyncRead + AsyncWrite {}
impl<S> AsyncStream for S where S: AsyncRead + AsyncWrite {}

/// An async abstraction over connections.
pub trait ConnectionLike {
    /// Sends an already encoded (packed) command into the TCP socket and
    /// reads the single response from it.
    fn req_packed_command<'a>(&'a mut self, cmd: &'a Cmd) -> RedisFuture<'a, Value>;

    /// Sends multiple already encoded (packed) command into the TCP socket
    /// and reads `count` responses from it.  This is used to implement
    /// pipelining.
    /// Important - this function is meant for internal usage, since it's
    /// easy to pass incorrect `offset` & `count` parameters, which might
    /// cause the connection to enter an erroneous state. Users shouldn't
    /// call it, instead using the Pipeline::query_async function.
    #[doc(hidden)]
    fn req_packed_commands<'a>(
        &'a mut self,
        cmd: &'a crate::Pipeline,
        offset: usize,
        count: usize,
    ) -> RedisFuture<'a, Vec<Value>>;

    /// Returns the database this connection is bound to.  Note that this
    /// information might be unreliable because it's initially cached and
    /// also might be incorrect if the connection like object is not
    /// actually connected.
    fn get_db(&self) -> i64;
}

// Initial setup for every connection.
async fn setup_connection<C>(connection_info: &RedisConnectionInfo, con: &mut C) -> RedisResult<()>
where
    C: ConnectionLike,
{
    if let Some(password) = &connection_info.password {
        let mut command = cmd("AUTH");
        if let Some(username) = &connection_info.username {
            command.arg(username);
        }
        match command.arg(password).query_async(con).await {
            Ok(Value::Okay) => (),
            Err(e) => {
                let err_msg = e.detail().ok_or((
                    ErrorKind::AuthenticationFailed,
                    "Password authentication failed",
                ))?;

                if !err_msg.contains("wrong number of arguments for 'auth' command") {
                    fail!((
                        ErrorKind::AuthenticationFailed,
                        "Password authentication failed",
                    ));
                }

                let mut command = cmd("AUTH");
                match command.arg(password).query_async(con).await {
                    Ok(Value::Okay) => (),
                    _ => {
                        fail!((
                            ErrorKind::AuthenticationFailed,
                            "Password authentication failed"
                        ));
                    }
                }
            }
            _ => {
                fail!((
                    ErrorKind::AuthenticationFailed,
                    "Password authentication failed"
                ));
            }
        }
    }

    if connection_info.db != 0 {
        match cmd("SELECT").arg(connection_info.db).query_async(con).await {
            Ok(Value::Okay) => (),
            _ => fail!((
                ErrorKind::ResponseError,
                "Redis server refused to switch database"
            )),
        }
    }

    // result is ignored, as per the command's instructions.
    // https://redis.io/commands/client-setinfo/
    #[cfg(not(feature = "disable-client-setinfo"))]
    let _: RedisResult<()> = crate::connection::client_set_info_pipeline()
        .query_async(con)
        .await;

    Ok(())
}

mod connection;
pub use connection::*;
mod multiplexed_connection;
pub use multiplexed_connection::*;
#[cfg(feature = "connection-manager")]
mod connection_manager;
#[cfg(feature = "connection-manager")]
#[cfg_attr(docsrs, doc(cfg(feature = "connection-manager")))]
pub use connection_manager::*;
mod runtime;
pub(super) use runtime::*;