use search::apply_move;
use std::io::{self, BufRead};
use std::sync::mpsc::{Receiver, Sender};

use std::process::exit;

use engine::{EngineMsg, InterfaceMsg, SearchInfo};
use game::{Game};

use std::thread::sleep_ms;
use log::info;


pub fn run(r: Receiver<InterfaceMsg>, s: Sender<EngineMsg>) {
    //unsafe { debug_log = Box::new(File::open("debug.log").unwrap()); }
    //unsafe { debug_log = Arc::new(Some(Mutex::new(File::create("~/debug.log").unwrap()))) };
    let stdin = io::stdin();
    for line_m in stdin.lock().lines() {
        let line = line_m.unwrap();

        info!("received line: {}", line);

        let split = line.split_whitespace().collect::<Vec<&str>>();
        run_command(split, &r, &s);
    }
}

fn run_command(mut cmd: Vec<&str>, r: &Receiver<InterfaceMsg>, s: &Sender<EngineMsg>) {
    if cmd.len() > 0 {
        let command = cmd[0];
        cmd.drain(0..1);
        match command {
            "uci" => cmd_uci(cmd),
            "isready" => cmd_isready(cmd),
            "position" => cmd_position(cmd, r, s),
            "go" => cmd_go(cmd, r, s),
            "stop" => cmd_stop(cmd, r, s),
            "ucinewgame" => cmd_newgame(cmd, r, s),
            "quit" | "exit" => cmd_quit(cmd, r, s),
            cmd => { println!("unknown command: {}", cmd); }
        }
    }
}

fn cmd_uci(_args: Vec<&str>) {
    println!("id name bishop 1.0");
    println!("id author Geile Siech");
    println!("uciok");
}

fn cmd_isready(_args: Vec<&str>) {
    println!("readyok");
}

fn cmd_position(mut args: Vec<&str>, r: &Receiver<InterfaceMsg>, s: &Sender<EngineMsg>) {
    let position = args[0];
    args.drain(0..1);

    let mut game = Game::default();
    if position == "startpos" {
    }
    else if position == "fen" {
        let fen_parts: Vec<&str> = Vec::from(&args[0..6]).into_iter().collect::<Vec<&str>>();
        let moves = &args[6..];

        game = Game::from_fen(fen_parts.as_slice()).unwrap();

        for mov in moves {
            let m = game.parse_move(mov);
            if let Ok(mm) = m {
                game = apply_move(&game, mm);
            }
            else {
                println!("error");
            }
        }
    }
    s.send(EngineMsg::SetBoard(game)).unwrap();
}

fn cmd_go(args: Vec<&str>, _r: &Receiver<InterfaceMsg>, s: &Sender<EngineMsg>) {
    s.send(EngineMsg::Search(SearchInfo::Movetime(1000))).unwrap();
}

fn cmd_stop(_args: Vec<&str>, _r: &Receiver<InterfaceMsg>, s: &Sender<EngineMsg>) {
    s.send(EngineMsg::Stop).unwrap();
}

fn cmd_newgame(_args: Vec<&str>, _r: &Receiver<InterfaceMsg>, s: &Sender<EngineMsg>) {
    s.send(EngineMsg::NewGame).unwrap();
}

fn cmd_quit(_args: Vec<&str>, _r: &Receiver<InterfaceMsg>, _s: &Sender<EngineMsg>) {
    exit(0);
}