mod config;
mod front;
mod weather;
mod xsetroot;

use anyhow::{Result};
use chrono::prelude::*;
use log::*;
use std::{
    fmt,
    io::{prelude::*, BufReader},
    net::Shutdown,
    os::unix::net::{UnixListener, UnixStream},
    sync::{Arc, Mutex},
    thread, time,
};
use xsetroot::XSetRoot;

// Name your user agent after your app?
pub static APP_USER_AGENT: &str = concat!(
    env!("CARGO_PKG_NAME"),
    "/",
    env!("CARGO_PKG_VERSION"),
    " +https://tulpa.dev/cadey/cabytcini",
);

pub(crate) type MTState = Arc<Mutex<State>>;

fn handle_client(stream: UnixStream, st: MTState) {
    let mut rdr = BufReader::new(&stream);
    let mut msg = String::new();
    let _ = rdr.read_line(&mut msg);
    let _ = write!(&stream, "OK");

    let mut data = st.lock().unwrap();
    data.msg = msg.trim().to_string();
    info!("new message: {}", data.msg);
    stream.shutdown(Shutdown::Both).expect("socket to close");
}

const UPDATE_FREQUENCY: u64 = 1000;

fn update_every_so_often(st: MTState) {
    loop {
        let so_often = time::Duration::from_millis(UPDATE_FREQUENCY);
        thread::sleep(so_often);

        {
            let data = st.lock().unwrap();
            data.show();
        }
    }
}

fn main() -> Result<()> {
    let st: State = State::init();
    st.show();
    let mtst = Arc::new(Mutex::new(st));
    env_logger::init();
    let cfg = config::load()?;

    // start update thread
    {
        let mtst = mtst.clone();
        thread::spawn(move || update_every_so_often(mtst));
    }

    // start front thread
    {
        let mtst = mtst.clone();
        let cfg = cfg.clone();
        thread::spawn(move || front::update(mtst, cfg));
    }

    // start weather thread
    {
        let mtst = mtst.clone();
        let cfg = cfg.clone();
        thread::spawn(move || weather::update(mtst, cfg));
    }

    let _ = std::fs::remove_file("/home/cadey/tmp/cabytcini.sock")?;
    let listener = UnixListener::bind("/home/cadey/tmp/cabytcini.sock")?;
    for stream in listener.incoming() {
        match stream {
            Ok(stream) => {
                let mtst = mtst.clone();
                thread::spawn(move || handle_client(stream, mtst));
            }
            Err(err) => {
                return Err(err.into());
            }
        }
    }

    Ok(())
}

pub(crate) struct State {
    msg: String,
    front: String,
    weather: Option<weather::Root>,
}

impl fmt::Display for State {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.msg)
    }
}

impl State {
    fn init() -> State {
        State {
            msg: "".to_string(),
            front: "".to_string(),
            weather: None,
        }
    }

    pub(crate) fn show(&self) {
        let now = Local::now().format("%H:%M M%m %-d %a");
        let xsr = XSetRoot::init().expect("xsetroot to initialize");

        let mut msg = String::new();

        if self.msg != "" {
            msg.push_str(format!("{} | ", self.msg).as_str());
        }

        if self.front != "" {
            msg.push_str(format!("{} | ", self.front).as_str());
        }

        match &self.weather {
            Some(datni) => msg.push_str(
                format!(
                    "{} {} / {} {} | ",
                    datni.currently.temperature,
                    datni.currently.summary,
                    datni.daily.data[0].temperature_high,
                    datni.daily.data[0].temperature_low
                )
                .as_str(),
            ),
            None => {}
        };

        msg.push_str(format!("{}", now).as_str());

        if let Err(why) = xsr.render(msg) {
            error!("error setting root window title: {:?}", why);
        }
    }
}