//! # peach-menu
//!
//! `peach_menu` is a collection of utilities and data structures for running
//! a menu state machine. I/O takes place using JSON-RPC 2.0 over websockets,
//! with `peach-buttons` providing GPIO input data and `peach-oled` receiving
//! output data for display.
//!
pub mod buttons;
pub mod state_machine;
mod states;
mod structs;

use std::env;

use crossbeam_channel::unbounded;
use log::{debug, info};
use ws::connect;

use crate::buttons::*;
use crate::state_machine::*;

/// Configures channels for message passing, launches the state machine
/// changer thread and connects to the `peach-buttons` JSON-RPC pubsub
/// service over websockets.
///
/// A Receiver is passed into `state_changer` and the corresponding Sender
/// is passed into the websockets client. This allows the `button_code` to
/// be extracted from the received websocket message and passed to the
/// state machine.
///
pub fn run() -> std::result::Result<(), Box<dyn std::error::Error>> {
    info!("Starting up.");

    debug!("Creating unbounded channel for message passing.");
    let (s, r) = unbounded();

    debug!("Spawning state-machine thread.");
    state_changer(r);

    let ws_addr = env::var("PEACH_BUTTONS_SERVER").unwrap_or_else(|_| "127.0.0.1:5111".to_string());

    let ws_server = format!("ws://{}", ws_addr);

    connect(ws_server, |out| Client { out, s: &s })?;

    Ok(())
}