#![allow(dead_code)]

/// Manage UCI messages and link into chess component
mod uci_command;

use log::warn;
use std::io::*;
use crate::uci_command::*;

pub struct UciEngine<Fi: Read, Fo: Write> {
    source: Fi,
    destination: Fo,
    uciok: bool,
    id: Id,
}

impl<Fi: Read, Fo:  Write> UciEngine<Fi, Fo> {
    pub fn new(source: Fi, destination: Fo) -> UciEngine<Fi, Fo> {
        UciEngine::<Fi, Fo>{
            source, destination,
            id: Id::new(), 
            uciok: false}
    }

    pub fn name(&self) -> Option<String> {
        self.id.name()
    }

    pub fn author(&self) -> Option<String> {
        self.id.author()
    }

    pub fn update(&mut self, id: &Id){
        if self.is_uciok() {warn!("Engine info should not be updated now (uciok)");}
        self.id.update(id);
    }
    
    pub fn update_from_str(&mut self, name: Option<&str>, author: Option<&str>){
        if self.is_uciok() {warn!("Engine info should not be updated now (uciok)");}
        self.id.update_from_str(name, author);
    }

    pub fn uciok(&mut self){
        self.uciok = true;
    }

    pub fn is_uciok(&self) -> bool {
        self.uciok
    }

    /// Parse UCI commands
    ///
    /// * id
    ///   * name *x*
    ///
    ///     this must be sent after receiving the "uci" command to identify the engine,
    ///     e.g. "id name Shredder X.Y\n"
    ///   * author *x*
    ///
    ///     this must be sent after receiving the "uci" command to identify the engine,
    ///     e.g. "id author Stefan MK\n"
    ///
    /// ```rust
    /// use chess_uci::*;
    /// use std::io;
    /// let mut engine = UciEngine::new(io::empty(), io::sink());
    ///
    /// engine.exec("id name Baptiste");
    /// assert_eq!(engine.name().expect(""), "Baptiste");
    ///
    /// engine.exec("id author   Monique       Jouve");
    /// assert_eq!(engine.author().expect(""), "Monique Jouve");
    ///
    /// ```
    ///
    /// * uciok
    ///
    ///    Must be sent after the id and optional options to tell the GUI that the engine
    ///    has sent all infos and is ready in uci mode.
    ///
    /// ```rust
    /// use chess_uci::*;
    /// use std::io;
    /// let mut engine = UciEngine::new(io::empty(), io::sink());
    /// assert_eq!(engine.is_uciok(), false);
    ///
    /// engine.exec("id name Baptiste");
    /// assert_eq!(engine.name().expect(""), "Baptiste");
    /// assert_eq!(engine.is_uciok(), false);
    ///
    /// engine.exec("id author   Monique       Jouve");
    /// assert_eq!(engine.author().expect(""), "Monique Jouve");
    /// assert_eq!(engine.is_uciok(), false);
    ///
    /// engine.exec("   uciok");
    /// assert_eq!(engine.is_uciok(), true);
    /// ```
    pub fn exec(&mut self, command: &str){
        match parse (&mut command.to_string()) {
            Ok(EngineCommand::Id{id}) => self.update(&id),
            Ok(EngineCommand::UciOk) => self.uciok(),
            Ok(_) => {unimplemented!("command not implemented")},
            Err(_) => warn!("Not a command"),
        }
    }

    pub fn next(&mut self) {
        exec(self.source.read_line());
    }
}