//! Low level PostgreSQL protocol. Defines the encoding and decoding of the messages communicated
//! to and from the database server.

// Many protocol types are implemented but unused (currently). The hope is to eventually
// work them all into the (raw) connection type.
#![allow(unused)]

use std::{io, str};

mod bind;
mod cancel_request;
mod close;
mod copy_data;
mod copy_done;
mod copy_fail;
mod describe;
mod encode;
mod execute;
mod flush;
mod parse;
mod password_message;
mod query;
mod startup_message;
mod sync;
mod terminate;

// TODO: mod gss_enc_request;
// TODO: mod gss_response;
// TODO: mod sasl_initial_response;
// TODO: mod sasl_response;
// TODO: mod ssl_request;

pub use self::{
    bind::Bind,
    cancel_request::CancelRequest,
    close::Close,
    copy_data::CopyData,
    copy_done::CopyDone,
    copy_fail::CopyFail,
    describe::{Describe, DescribeKind},
    encode::Encode,
    execute::Execute,
    flush::Flush,
    parse::Parse,
    password_message::PasswordMessage,
    query::Query,
    startup_message::StartupMessage,
    sync::Sync,
    terminate::Terminate,
};

mod authentication;
mod backend_key_data;
mod command_complete;
mod data_row;
mod decode;
mod notification_response;
mod parameter_description;
mod parameter_status;
mod ready_for_query;
mod response;
mod row_description;

// TODO: Audit backend protocol

mod message;

pub use self::{
    authentication::Authentication,
    backend_key_data::BackendKeyData,
    command_complete::CommandComplete,
    data_row::DataRow,
    decode::Decode,
    message::Message,
    notification_response::NotificationResponse,
    parameter_description::ParameterDescription,
    parameter_status::ParameterStatus,
    ready_for_query::ReadyForQuery,
    response::Response,
    row_description::{RowDescription, RowField},
};

fn read_string(buf: &mut &[u8]) -> io::Result<String> {
    let str_len = memchr::memchr(0u8, buf)
        .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "unterminated string"))?;

    let string = str::from_utf8(&buf[..str_len])
        .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;

    *buf = &buf[str_len + 1..];

    Ok(string.to_owned())
}