#![warn(missing_docs)]
//! Automattermostatus main components and helper functions:
//! - `config`: allow to configure the application from file and command line,
//! - `mattermost`:  updating custom status on a mattermost instance,
//! - `state`: persistent application state (essentially the location),
//! - `wifiscan`: wifi scanning for linux, macos and windows
//! - `offtime`: management of time when no custom status shall be send
//!
use anyhow::{bail, Context, Result};
use std::path::PathBuf;
use std::thread::sleep;
use std::{collections::HashMap, time};
use tracing::{debug, info, warn};
use tracing_subscriber::prelude::*;
use tracing_subscriber::{fmt, layer::SubscriberExt, EnvFilter};

pub mod config;
pub mod mattermost;
pub mod offtime;
pub mod state;
pub mod utils;
pub mod wifiscan;
pub use config::{Args, WifiStatusConfig};
pub use mattermost::MMStatus;
use offtime::Off;
pub use state::{Cache, Location, State};
pub use wifiscan::{WiFi, WifiInterface};

/// Setup logging to stdout
/// (Tracing is a bit more involving to set up but will provide much more feature if needed)
pub fn setup_tracing(args: &Args) -> Result<()> {
    let fmt_layer = fmt::layer().with_target(false);
    let filter_layer = EnvFilter::try_new(args.verbose.get_level_filter().to_string()).unwrap();

    tracing_subscriber::registry()
        .with(filter_layer)
        .with(fmt_layer)
        .init();
    Ok(())
}

/// Return a `Cache` used to persist state.
pub fn get_cache(dir: Option<PathBuf>) -> Result<Cache> {
    let mut state_file_name: PathBuf;
    if let Some(ref state_dir) = dir {
        state_file_name = PathBuf::from(state_dir);
    } else {
        bail!("Internal Error, no `state_dir` configured");
    }

    state_file_name.push("automattermostatus.state");
    Ok(Cache::new(state_file_name))
}

/// Prepare a dictionnary of `Status` ready to be send to mattermost
/// server depending upon the location being found.
pub fn prepare_status(args: &Args) -> Result<HashMap<Location, MMStatus>> {
    let mut res = HashMap::new();
    for s in &args.status {
        let sc: WifiStatusConfig = s.parse().with_context(|| format!("Parsing {}", s))?;
        debug!("Adding : {:?}", sc);
        res.insert(
            Location::Known(sc.wifi_string),
            MMStatus::new(
                sc.text,
                sc.emoji,
                args.mm_url
                    .as_ref()
                    .expect("Mattermost URL is not defined")
                    .clone(),
                args.mm_token
                    .clone()
                    .expect("Mattermost private access token is not defined"),
            ),
        );
    }
    Ok(res)
}

/// Main application loop, looking for a known SSID and updating
/// mattermost custom status accordingly.
pub fn get_wifi_and_update_status_loop(
    args: Args,
    mut status_dict: HashMap<Location, MMStatus>,
) -> Result<()> {
    let cache = get_cache(args.state_dir.to_owned()).context("Reading cached state")?;
    let mut state = State::new(&cache).context("Creating cache")?;
    let delay_duration = time::Duration::new(
        args.delay
            .expect("Internal error: args.delay shouldn't be None")
            .into(),
        0,
    );
    let wifi = WiFi::new(
        &args
            .interface_name
            .clone()
            .expect("Internal error: args.interface_name shouldn't be None"),
    );
    if !wifi
        .is_wifi_enabled()
        .context("Checking if wifi is enabled")?
    {
        bail!("wifi is disabled");
    } else {
        info!("Wifi is enabled");
    }
    loop {
        if !&args.is_off_time() {
            let ssids = wifi.visible_ssid().context("Getting visible SSIDs")?;
            debug!("Visible SSIDs {:#?}", ssids);
            let mut found_ssid = false;
            // Search for known wifi in visible ssids
            for (l, mmstatus) in status_dict.iter_mut() {
                if let Location::Known(wifi_substring) = l {
                    if ssids.iter().any(|x| x.contains(wifi_substring)) {
                        if wifi_substring.is_empty() {
                            debug!("We do not match against empty SSID reserved for off time");
                            break;
                        }
                        debug!("known wifi '{}' detected", wifi_substring);
                        found_ssid = true;
                        let mmstatus = mmstatus.clone().expires_at(&args.expires_at);
                        state
                            .update_status(l.clone(), Some(&mmstatus), &cache)
                            .context("Updating status")?;
                        break;
                    }
                }
            }
            if !found_ssid {
                debug!("Unknown wifi");
                state
                    .update_status(Location::Unknown, None, &cache)
                    .context("Updating status")?;
            }
        } else {
            // Send status for Off time (the one with empty wifi_substring).
            debug!("{:?}", status_dict);
            let off_location = Location::Known("".to_string());
            if let Some(offstatus) = status_dict.get_mut(&off_location) {
                debug!("Setting state for Offtime");
                state
                    .update_status(off_location, Some(offstatus), &cache)
                    .context("Updating status")?;
            }
        }
        if let Some(0) = args.delay {
            break;
        } else {
            sleep(delay_duration);
        }
    }
    Ok(())
}