extern crate chess;
extern crate chess_uci;

use chess::ChessMove;
use chess_uci::*;
use chess_uci::uci_command::EngineCommand;

use std::process::{Command, Stdio};
use std::str::FromStr;

pub fn main(){
    env_logger::init();

    println!("Launching hardcoded stockfish program (should be in PATH)");

    // launch chess program
    let process = match Command::new("stockfish")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .spawn() {
            Err(why) => panic!("couldn't spawn stockfish: {}", why),
            Ok(process) => process,
        };

    let (sf_in,sf_out) = (process.stdin.expect("Program stdin"), process.stdout.expect("Program stdout"));
    let mut uci = UciEngine::new(Some(sf_out), Some(sf_in));
    uci.game_option(GameOption::WhitePlayer { value: Player::Human { elo: None } });
    uci.game_option(GameOption::BlackPlayer { value: Player::Machine { elo: Some(1500) } });
    uci.init();

    println!("Engine: {} \nby: {}",
             if let Some(name) = uci.name() {name} else {"Not defined".to_string()},
             if let Some(author) = uci.author() {author} else {"Not defined".to_string()});
    uci.push(uci_command::GuiCommand::SetOption { option:  uci_command::Opt::SlowMover { value: 11 }});

    uci.new_game();
    uci.push_raw("d\n");

    uci.human_play(ChessMove::from_str("e2e4").expect("error converting e2e4")).expect("can not make human move");

    uci.push_raw("d\n");

    uci.go().expect("can not make engine move");
    
    loop {
        match uci.pull() {
            Some(EngineCommand::BestMove { best_move, .. }) => {
                uci.make_move(best_move);
                break
            },
            Some(EngineCommand::Info { .. }) => continue,
            _ => continue,
        }
    }

    uci.push_raw("d\n");

    uci.push_raw("quit\n");
    while uci.pull_raw().is_some() {}
}