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use std::{cell::RefCell, future::Future, rc::Rc};

use ntex::codec::{AsyncRead, AsyncWrite};
use ntex::connect::{self, Address, Connect, Connector};
use ntex::framed::{ReadTask, State, WriteTask};
use ntex::service::Service;
use ntex::util::ByteString;

#[cfg(feature = "openssl")]
use ntex::connect::openssl::{OpensslConnector, SslConnector};

#[cfg(feature = "rustls")]
use ntex::connect::rustls::{ClientConfig, RustlsConnector};

use super::errors::ConnectError;
use super::{cmd, Client, SimpleClient};

/// Redis connector
pub struct RedisConnector<A, T> {
    address: A,
    connector: T,
    passwords: Vec<ByteString>,
    lw: u16,
    read_hw: u16,
    write_hw: u16,
}

impl<A> RedisConnector<A, ()>
where
    A: Address + Clone,
{
    #[allow(clippy::new_ret_no_self)]
    /// Create new redis connector
    pub fn new(address: A) -> RedisConnector<A, Connector<A>> {
        RedisConnector {
            address,
            passwords: Vec::new(),
            connector: Connector::default(),
            lw: 1024,
            read_hw: 16 * 1024,
            write_hw: 16 * 1024,
        }
    }
}

impl<A, T> RedisConnector<A, T>
where
    A: Address + Clone,
    T: Service<Request = Connect<A>, Error = connect::ConnectError>,
    T::Response: AsyncRead + AsyncWrite + Unpin + 'static,
{
    /// Add redis auth password
    pub fn password<U>(mut self, password: U) -> Self
    where
        U: AsRef<str>,
    {
        self.passwords
            .push(ByteString::from(password.as_ref().to_string()));
        self
    }

    #[inline]
    /// Set read/write buffer params
    ///
    /// By default read buffer is 16kb, write buffer is 16kb
    pub fn buffer_params(
        mut self,
        max_read_buf_size: u16,
        max_write_buf_size: u16,
        min_buf_size: u16,
    ) -> Self {
        self.read_hw = max_read_buf_size;
        self.write_hw = max_write_buf_size;
        self.lw = min_buf_size;
        self
    }

    /// Use custom connector
    pub fn connector<U>(self, connector: U) -> RedisConnector<A, U>
    where
        U: Service<Request = Connect<A>, Error = connect::ConnectError>,
        U::Response: AsyncRead + AsyncWrite + Unpin + 'static,
    {
        RedisConnector {
            connector,
            address: self.address,
            passwords: self.passwords,
            read_hw: self.read_hw,
            write_hw: self.write_hw,
            lw: self.lw,
        }
    }

    #[cfg(feature = "openssl")]
    /// Use openssl connector.
    pub fn openssl(self, connector: SslConnector) -> RedisConnector<A, OpensslConnector<A>> {
        RedisConnector {
            address: self.address,
            passwords: self.passwords,
            connector: OpensslConnector::new(connector),
            read_hw: self.read_hw,
            write_hw: self.write_hw,
            lw: self.lw,
        }
    }

    #[cfg(feature = "rustls")]
    /// Use rustls connector.
    pub fn rustls(
        self,
        config: std::sync::Arc<ClientConfig>,
    ) -> RedisConnector<A, RustlsConnector<A>> {
        RedisConnector {
            address: self.address,
            passwords: self.passwords,
            connector: RustlsConnector::new(config),
            read_hw: self.read_hw,
            write_hw: self.write_hw,
            lw: self.lw,
        }
    }

    /// Connect to redis server and create shared client
    pub fn connect(&self) -> impl Future<Output = Result<Client, ConnectError>> {
        let read_hw = self.read_hw;
        let write_hw = self.write_hw;
        let lw = self.lw;
        let passwords = self.passwords.clone();
        let fut = self.connector.call(Connect::new(self.address.clone()));

        async move {
            let io = fut.await?;

            let state = State::with_params(read_hw, write_hw, lw, 0);
            let io = Rc::new(RefCell::new(io));
            ntex::rt::spawn(ReadTask::new(io.clone(), state.clone()));
            ntex::rt::spawn(WriteTask::new(io, state.clone()));

            let client = Client::new(state);

            if passwords.is_empty() {
                Ok(client)
            } else {
                for password in passwords {
                    if client.exec(cmd::Auth(password)).await? {
                        return Ok(client);
                    }
                }
                Err(ConnectError::Unauthorized)
            }
        }
    }

    /// Connect to redis server and create simple client
    pub fn connect_simple(&self) -> impl Future<Output = Result<SimpleClient, ConnectError>> {
        let read_hw = self.read_hw;
        let write_hw = self.write_hw;
        let lw = self.lw;
        let passwords = self.passwords.clone();
        let fut = self.connector.call(Connect::new(self.address.clone()));

        async move {
            let io = fut.await?;

            let state = State::with_params(read_hw, write_hw, lw, 0);
            let io = Rc::new(RefCell::new(io));
            ntex::rt::spawn(ReadTask::new(io.clone(), state.clone()));
            ntex::rt::spawn(WriteTask::new(io, state.clone()));

            let mut client = SimpleClient::new(state);

            if passwords.is_empty() {
                Ok(client)
            } else {
                for password in passwords {
                    if client.exec(cmd::Auth(password)).await? {
                        return Ok(client);
                    }
                }
                Err(ConnectError::Unauthorized)
            }
        }
    }
}