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

use std::process::exit;

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

use std::fs::File;
use std::io::Write;
use std::cell::RefCell;


thread_local!(static debug_log: RefCell<File> = RefCell::new(File::create("debug.log").unwrap()));



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

        debug_log.with(|fc| 
            writeln!(fc.borrow_mut(), "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),
            "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<String> = Vec::from(&args[0..6]).into_iter().map(|x| x.to_owned() + " ").collect::<Vec<String>>();

        debug_log.with(|fc| 
            writeln!(fc.borrow_mut(), "fen string is: {:?}", fen_parts)
        );
        
        // "3N4/5P2/2K1P1pP/p2PNn2/1p3r2/2P4P/4k2B/8 w - - 0 1"
    }
    s.send(EngineMsg::SetBoard(game)).unwrap();
}

fn cmd_go(_args: Vec<&str>, _r: &Receiver<InterfaceMsg>, s: &Sender<EngineMsg>) {
    s.send(EngineMsg::Search(3)).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);
}