//! `gatewayd serve --config <path>`: the Mattermost channel. It loads its configuration and its
//! token, prepares its directory, then serves until it must stop (exit 1).

use std::os::unix::fs::DirBuilderExt;
use std::path::Path;
use std::process::ExitCode;
use std::sync::Arc;
use std::sync::atomic::AtomicBool;

use gatewayd::config::{Config, MATTERMOST_TOKEN};
use gatewayd::secrets;
use gatewayd::serve::{START_FAILED, Tuning, run};

fn main() -> ExitCode {
    // `args_os`: the config path need not be UTF-8, and `args` would panic on one that is not.
    let args: Vec<std::ffi::OsString> = std::env::args_os().skip(1).collect();
    let words: Vec<Option<&str>> = args.iter().map(|a| a.to_str()).collect();
    match (words.as_slice(), args.get(2)) {
        ([Some("serve"), Some("--config"), _], Some(path)) => serve(Path::new(path)),
        _ => {
            eprintln!("usage: gatewayd serve --config <path>");
            ExitCode::from(2)
        }
    }
}

fn serve(path: &Path) -> ExitCode {
    // Each failure prints one line (plus its pointer) and returns ExitCode::from(1):
    // 1. `Config::load`: "gatewayd: <error>\n<START_FAILED>". 2. `token_source`: "gatewayd: <path>:
    //    <why>\n<START_FAILED>".
    // 3. `secrets::load(MATTERMOST_TOKEN, &source, &|k| std::env::var_os(k))`: "gatewayd: <error>"
    //    (it carries its pointer). Print the warning, if any, as it is. 4. Create the state file
    //    directory, recursive, 0700: "gatewayd: cannot prepare <dir>: <e>\n<START_FAILED>". 5.
    //    `run` with Tuning::default(), a log that prints each line to standard error, and a stop
    //    flag that is never set; print the Stop it returns.
    todo!()
}