use comm;
use comm::Channel;
use config::Config;
use std::io;

pub fn external(tx: &Channel, _cfg: &Config) {
    let mut line = String::new();
    loop {
        line.clear();
        io::stdin().read_line(&mut line).ok().expect("Failed to read line");
        let kind = line.remove(0);
        let line = line.trim();

        match kind {
            'M' => comm::send(tx, "cmus", &format!("%{{A:cmus:}}{}%{{A}}", line)),
            'W' => comm::send(tx, "desktops", &parse_bspwm(line)),
            _ => ()
        }
    }
}

fn parse_bspwm(line: &str) -> String {
    let mut out = String::new();
    let mut monitor_count = 0;
    let mut monitor_selected = false;

    let elems = line.split(':');
    for elem in elems {
        let mut chars = elem.chars();
        let kind = chars.next().unwrap();
        let name = chars.collect::<String>();

        if kind == 'M' || kind == 'm' {
            out = format!("{}%{{S{num}}}", out, num = monitor_count);
            monitor_count += 1;
            monitor_selected = kind.is_uppercase();
        }
        else if kind == 'L' {
        }
        else if kind == 'G' {
        }
        else if kind == 'T' {
        }
        else {
            let desktop = format!("%{{A:w{name}:}} {name} %{{A}}", name = name);
            if kind.is_uppercase() {
                if monitor_selected {
                    out = format!("{}%{{B#66CC66}}{}%{{B-}}", out, desktop);
                }
                else {
                    out = format!("{}%{{B#666666}}{}%{{B-}}", out, desktop);
                }
            }
            else if kind == 'U' || kind == 'u' {
                out = format!("{}%{{B#CC0033}}{}%{{B-}}", out, desktop);
            }
            else if kind == 'O' || kind == 'o' {
                out = format!("{}{}", out, desktop);
            }
        }
    }
    out
}