use std::fmt;
use std::io::{BufRead, BufReader, BufWriter, ErrorKind, Write};
use std::net::SocketAddr;

use log::error;

use mio::net::TcpStream;
use mio::Token;

use crate::result::RudeResult;
use crate::state::*;

/// `Client` struct for storing information about a connected client, also
/// a few helper functions for communicating with the client.
#[derive(Debug)]
pub struct Client {
	/// TCP socket
	pub socket: TcpStream,

	/// Identifier token
	pub token: Token,

	/// IP information
	pub addr: SocketAddr,

	/// Client's play state
	pub state: State,
}

impl fmt::Display for Client {
	/// Only need the ip and port to be printed.
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
		write!(f, "{}:{}", self.addr.ip(), self.addr.port())
	}
}

impl Into<String> for Client {
	/// Convert the ip and port into a string.
	fn into(self) -> String {
		format!("{}:{}", self.addr.ip(), self.addr.port())
	}
}

impl Client {
	/// Read a message from the client
	pub fn read(&self) -> RudeResult<String> {
		let reader = BufReader::new(&self.socket);
		let mut buf = String::new();

		for line in reader.lines() {
			match line {
				Ok(line) => buf += &line,
				Err(e) => match e.kind() {
					ErrorKind::WouldBlock => break,
					_ => return Err(e.into()),
				},
			}
		}

		Ok(buf)
	}

	/// Send a string to the client.
	pub fn send_without_prompt<T: Into<String>>(&mut self, message: T) {
		let message = message.into();
		let mut writer = BufWriter::new(&self.socket);
		if let Err(e) = writer.write_all(message.as_bytes()) {
			error!("Unable to send message to client ({:?}): {}", self, e);
		}
	}

	/// Send a string to the client, followed by a prompt.
	pub fn send_with_prompt<T: Into<String>>(&mut self, message: T) {
		let message = message.into() + self.prompt();
		let mut writer = BufWriter::new(&self.socket);
		if let Err(e) = writer.write_all(message.as_bytes()) {
			error!("Unable to send message to client ({:?}): {}", self, e);
		}
	}

	fn prompt(&self) -> &str {
		"\n> "
	}
}