use std::sync::mpsc::{Receiver, TryRecvError};
use log::{error, info};
use trifid_pki::ed25519_dalek::{SecretKey, SigningKey};
use trifid_pki::rand_core::OsRng;
use trifid_pki::x25519_dalek::StaticSecret;
use crate::config::{load_cdata, save_cdata, TFClientConfig};
use crate::daemon::ThreadMessageSender;

pub enum APIWorkerMessage {
    Shutdown
}

pub fn apiworker_main(config: TFClientConfig, instance: String, _transmitters: ThreadMessageSender, rx: Receiver<APIWorkerMessage>) {
    // Generate dhPubkey and edPubkey if it doesn't exist
    // Load vardata
    let mut vdata = match load_cdata(&instance) {
        Ok(d) => d,
        Err(e) => {
            error!("Error loading vdata: {}", e);
            error!("APIWorker exiting with error");
            return;
        }
    };

    if vdata.ed_privkey.is_none() {
        info!("Generating ed25519 key");
        let mut csprng = OsRng;
        let key = SigningKey::generate(&mut csprng);
        let ed_key_bytes = key.to_bytes().to_vec();
        vdata.ed_privkey = Some(ed_key_bytes.try_into().unwrap());
    }
    if vdata.dh_privkey.is_none() {
        info!("Generating ecdh key");
        let mut csprng = OsRng;
        let key = StaticSecret::new(&mut csprng);
        let dh_key_bytes = key.to_bytes();
        vdata.dh_privkey = Some(dh_key_bytes);
    }

    info!("Loading keys");
    let ed_key = SigningKey::from_bytes(&SecretKey::from(vdata.ed_privkey.unwrap()));
    let dh_key = StaticSecret::from(vdata.dh_privkey.unwrap());
    info!("Keys loaded successfully");

    // Save vardata
    match save_cdata(&instance, vdata) {
        Ok(_) => (),
        Err(e) => {
            error!("Error saving vdata: {}", e);
            error!("APIWorker exiting with error");
            return;
        }
    }
    loop {
        match rx.try_recv() {
            Ok(msg) => {
                match msg {
                    APIWorkerMessage::Shutdown => {
                        info!("recv on command socket: shutdown, stopping");
                        break;
                    }
                }
            },
            Err(e) => {
                match e {
                    TryRecvError::Empty => {}
                    TryRecvError::Disconnected => {
                        error!("apiworker command socket disconnected, shutting down to prevent orphaning");
                        break;
                    }
                }
            }
        }
    }
}