mize/src/core/instance/mod.rs

use async_trait::async_trait;
use colored::Colorize;
use core::fmt;
use flume::{bounded, unbounded, Receiver, Sender};
use interner::shared::{StringPool, VecStringPool};
use mize_macros::mize_part;
use std::any::Any;
use std::collections::HashMap;
use std::fs::create_dir;
use std::fs::File;
use std::ops::{Deref, DerefMut};
use std::path::{Path, PathBuf};
use std::sync::{Arc, Mutex};
use std::thread::panicking;
use std::{thread, vec};
use tracing::{debug, error, info, trace, warn, Instrument};
use uuid::Uuid;

use crate::config::ConfigOptNameAndMize;
use crate::config::{gather_config, ConfigOpt};
use crate::error::{IntoMizeResult, MizeError, MizeResult, MizeResultTrait};
use crate::id::{IntoMizeId, MizeId, Namespace};
use crate::instance::store::Store;
use crate::instance::subscription::Subscription;
use crate::instance::updater::Operation;
use crate::instance::updater::{updater_thread, updater_thread_async};
use crate::item::{Item, ItemData};
use crate::memstore::MemStore;
use crate::mize_err;
use crate::proto::MizeMessage;

use self::connection::{ConnListener, Connection};
use self::updater::handle_operation;

#[cfg(feature = "async")]
use tokio::runtime::Handle;
#[cfg(feature = "async")]
use tokio::runtime::Runtime;

use core::future::Future;
use std::thread::JoinHandle;

pub mod connection;
pub mod msg_thread;
pub mod store;
pub mod subscription;
pub mod updater;

#[cfg(test)]
mod tests;

static MSG_CHANNEL_SIZE: usize = 200;

static BUILD_TIME_CONFIG: &str = include_str!(std::env!("MIZE_BUILD_CONFIG"));

/// The Instance type is the heart of the mize system
#[derive(Clone)]
pub struct Mize {
    // a bit a lot of Mutexes isn't it???
    pub(crate) store: Arc<Mutex<Box<dyn Store>>>,
    connections: Arc<Mutex<Vec<Connection>>>,
    next_con_id: Arc<Mutex<u64>>,
    subs: Arc<Mutex<HashMap<MizeId, Vec<Subscription>>>>,
    pub(crate) id_pool: Arc<Mutex<VecStringPool>>,
    pub(crate) namespace_pool: Arc<Mutex<StringPool>>,

    pub(crate) listeners: Arc<
        Mutex<HashMap<String, Arc<dyn Fn(MizeMessage, &mut Mize) -> MizeResult<()> + Send + Sync>>>,
    >,

    pub parts: Arc<Mutex<HashMap<&'static str, Option<Box<dyn MizePart + Sync + Send>>>>>,
    //pub(crate) platform: Arc<Mutex<Box<dyn MizePlatform>>>, // should we do that instead of all the #cfg(faturs=targt-smth) in lib.rs
    part_names: Arc<Mutex<Vec<&'static str>>>, // exists, so that we know the ordering in which parts were loaded

    pub(crate) config_opts: Arc<Mutex<HashMap<String, ConfigOpt>>>,

    // the namespace the instance operates in
    pub(crate) namespace: Arc<Mutex<Namespace>>,

    // the namespace of the instance itself
    // TODO: set to a random uuid
    pub(crate) self_namespace: Arc<Mutex<Namespace>>,
    pub(crate) op_tx: Sender<Operation>,
    threads: Arc<Mutex<Vec<(u32, String, Option<JoinHandle<MizeResult<()>>>)>>>,
    next_thread_id: Arc<Mutex<u32>>,
    give_msg_wait: Arc<Mutex<HashMap<MizeId, Vec<Sender<ItemData>>>>>,
    create_msg_wait: Arc<Mutex<Option<Sender<MizeId>>>>,

    #[cfg(feature = "async")]
    pub(crate) runtime: Arc<Mutex<Runtime>>,
}

// the public Mize API

pub struct InstanceRef {
    inner: Arc<Mutex<Mize>>,
}

pub struct InstanceAsync {
    inner: Arc<Mutex<Mize>>,
}

pub struct DynMizePartGuard {
    pub mize: Mize,
    pub part: Option<Box<dyn MizePart + Send + Sync>>,
}

pub struct MizePartGuard<T: MizePart + Send + Sync + 'static> {
    pub mize: Mize,
    pub part: Option<T>,
}

impl<T: MizePart + Send + Sync> Deref for MizePartGuard<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &*self.part.as_ref().unwrap()
    }
}

impl<T: MizePart + Send + Sync> DerefMut for MizePartGuard<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut *self.part.as_mut().unwrap()
    }
}

impl<T: MizePart + Send + Sync> Drop for MizePartGuard<T> {
    fn drop(&mut self) {
        if self.part.is_none() {
            return;
        }
        let part = self.part.take().unwrap();
        self.mize.give_back_part(Box::new(part));
    }
}

impl Deref for DynMizePartGuard {
    type Target = dyn MizePart + Send + Sync;

    fn deref(&self) -> &Self::Target {
        &*self.part.as_deref().unwrap()
    }
}

impl DerefMut for DynMizePartGuard {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut *self.part.as_deref_mut().unwrap()
    }
}

impl Drop for DynMizePartGuard {
    fn drop(&mut self) {
        if self.part.is_none() {
            return;
        }
        self.mize.give_back_part(self.part.take().unwrap());
    }
}

pub trait MizePartCreateGenerated: Sized {
    fn create_generated(mize: Mize) -> Self;
}
pub trait MizePartGenerated {
    fn name_generated(&self) -> &'static str;
    fn get_mize_generated(&mut self) -> &mut Mize;
    fn as_any_generated(&self) -> &dyn Any;
    fn as_any_mut_generated(&mut self) -> &mut dyn Any;
    fn into_any_generated(self: Box<Self>) -> Box<dyn Any>;
}

pub trait MizePartCreate: MizePartCreateGenerated + MizePart + 'static {
    fn create(mize: &mut Mize) -> MizeResult<Box<dyn MizePart>> {
        Ok(Box::new(Self::create_generated(mize.clone())))
    }
}

pub trait MizePartCreateThisSucks: MizePartCreate + MizePart + 'static {
    fn create_this_sucks(mize: &mut Mize) -> MizeResult<Box<dyn MizePart>> {
        Self::create(mize)
    }
}

pub struct EmptyPart {
    pub(crate) mize: Mize,
}
impl MizePartGenerated for EmptyPart {
    fn name_generated(&self) -> &'static str {
        "empty"
    }
    fn get_mize_generated(&mut self) -> &mut Mize {
        &mut self.mize
    }
    fn as_any_generated(&self) -> &dyn Any {
        self
    }
    fn as_any_mut_generated(&mut self) -> &mut dyn Any {
        self
    }
    fn into_any_generated(self: Box<Self>) -> Box<dyn Any> {
        self
    }
}

impl MizePart for EmptyPart {}

#[async_trait]
pub trait MizePart: MizePartGenerated {
    fn name(&self) -> &'static str {
        self.name_generated()
    }
    fn get_mize(&mut self) -> &mut Mize {
        self.get_mize_generated()
    }
    fn as_any(&self) -> &dyn Any {
        self.as_any_generated()
    }
    fn as_any_mut(&mut self) -> &mut dyn Any {
        self.as_any_mut_generated()
    }
    fn into_any(self: Box<Self>) -> Box<dyn Any> {
        self.into_any_generated()
    }
    fn init(&mut self, mize: &mut Mize) -> MizeResult<()> {
        Ok(())
    }
    fn run(&mut self, mize: &mut Mize) -> MizeResult<()> {
        Ok(())
    }
    fn deps(&self) -> &'static [&'static str] {
        &[]
    }
    fn opts(&self, mize: &mut Mize) {
        ()
    }
    async fn async_run(&mut self, mize: &mut Mize) -> MizeResult<()> {
        Ok(())
    }
    async fn async_init(&mut self, mize: &mut Mize) -> MizeResult<()> {
        Ok(())
    }
}

impl Mize {
    pub fn empty() -> MizeResult<Mize> {
        let id_pool = Arc::new(Mutex::new(VecStringPool::default()));
        let namespace_pool_raw = StringPool::default();
        let connections = Arc::new(Mutex::new(Vec::new()));
        let subs = Arc::new(Mutex::new(HashMap::new()));
        let (op_tx, op_rx) = unbounded();
        let give_msg_wait = Arc::new(Mutex::new(HashMap::new()));
        let create_msg_wait = Arc::new(Mutex::new(None));
        let namespace = Arc::new(Mutex::new(Namespace(
            namespace_pool_raw.get("mize.default.namespace"),
        )));
        let self_namespace = Arc::new(Mutex::new(Namespace(
            namespace_pool_raw.get("mize.default.namespace"),
        )));

        let mut instance = Mize {
            store: Arc::new(Mutex::new(Box::new(MemStore::new()))),
            parts: Arc::new(Mutex::new(HashMap::new())),
            part_names: Arc::new(Mutex::new(Vec::new())),
            config_opts: Arc::new(Mutex::new(HashMap::new())),
            listeners: Arc::new(Mutex::new(HashMap::new())),
            connections,
            subs,
            id_pool,
            namespace,
            self_namespace,
            op_tx,
            namespace_pool: Arc::new(Mutex::new(namespace_pool_raw)),
            threads: Arc::new(Mutex::new(Vec::new())),
            next_thread_id: Arc::new(Mutex::new(0)),
            next_con_id: Arc::new(Mutex::new(1)),
            give_msg_wait,
            create_msg_wait,

            #[cfg(feature = "async")]
            #[cfg(not(feature = "target-js"))]
            runtime: Arc::new(Mutex::new(
                Runtime::new().mres_msg("Could not create async runtime")?,
            )),
        };

        #[cfg(feature = "target-os")]
        {
            let instance_clone = instance.clone();
            let op_rx_clone = op_rx.clone();
            let closure = move || updater_thread(op_rx_clone, &instance_clone);
            instance.spawn_background("updater_thread", closure)?;

            let instance_clone_two = instance.clone();
            let closure_two = move || updater_thread(op_rx, &instance_clone_two);
            instance.spawn_background("updater_thread", closure_two)?;
        }

        // set up async update "threads" when using wasm
        #[cfg(feature = "target-wasm ")]
        {
            let instance_clone = instance.clone();
            let op_rx_clone = op_rx.clone();
            wasm_bindgen_futures::spawn_local(updater_thread_async(op_rx_clone, instance_clone));

            let instance_clone_two = instance.clone();
            wasm_bindgen_futures::spawn_local(updater_thread_async(op_rx, instance_clone_two));
        }

        // will move the msg stuff into it's own thread
        // like this it can deadlock.... if a msg waits on an operation to complete
        //let msg_instance_clone = instance.clone();
        //let msg_closure = move || msg_thread(op_rx, instance_clone);
        //instance.spawn("msg_thread", closure)?;

        #[cfg(feature = "target-wasm ")]
        console_log!("before loading build time config");

        // load the config from build time
        let config = ItemData::from_toml(BUILD_TIME_CONFIG)?;
        instance.set_blocking("0", config);

        #[cfg(feature = "target-wasm ")]
        console_log!("after loading build time config");

        return Ok(instance);
    }

    pub fn new() -> MizeResult<Mize> {
        trace!("[ {} ] Instance::new()", "CALL".yellow());

        let mut instance = Mize::empty()?;

        instance.init()?;

        debug!(
            "instance inited with config: {}",
            instance.get("0/config")?.as_data_full()?
        );

        return Ok(instance);
    }

    pub fn get_part(&mut self, name: &str) -> MizeResult<DynMizePartGuard> {
        match self.parts.lock().unwrap().get_mut(name) {
            Some(part) => Ok(DynMizePartGuard {
                part: Some(part.take().unwrap()),
                mize: self.clone(),
            }),
            None => Err(mize_err!("Part '{name}' not found or currently taken")),
        }
    }
    pub fn has_part(&mut self, name: &str) -> bool {
        self.parts.lock().unwrap().contains_key(name)
    }
    pub fn add_part(&mut self, part: Box<dyn MizePart + Send + Sync>) -> MizeResult<()> {
        self.part_names.lock().unwrap().push(part.name());
        self.parts.lock().unwrap().insert(part.name(), Some(part));
        Ok(())
    }
    pub fn register_part(&mut self, part: Box<dyn MizePart + Send + Sync>) -> MizeResult<()> {
        self.part_names.lock().unwrap().push(part.name());
        self.parts.lock().unwrap().insert(part.name(), Some(part));
        Ok(())
    }
    pub fn add_listener(
        &mut self,
        name: &str,
        handler: Box<dyn Fn(MizeMessage, &mut Mize) -> MizeResult<()> + Send + Sync>,
    ) -> MizeResult<()> {
        println!("adding listener: {}", name);
        let name = name.to_owned();
        let mut listeners = self.listeners.lock().unwrap();
        listeners.insert(name, Arc::new(handler));

        Ok(())
    }
    fn part_names(&mut self) -> Vec<&'static str> {
        self.part_names.lock().unwrap().clone()
    }

    pub(crate) fn give_back_part(&mut self, part: Box<dyn MizePart + Send + Sync>) {
        self.parts.lock().unwrap().insert(part.name(), Some(part));
    }

    pub fn init(&mut self) -> MizeResult<()> {
        // gather config options from all parts
        gather_config(self)?;

        // platform specific init code
        crate::platform::any::instance_init(self)?;

        // end of platform specific init code

        // load the modules, as specified in the parts config
        match self
            .get_config("parts")
            .unwrap_or(ItemData::new())
            .value_string()
        {
            Ok(parts_to_load) => {
                for part_name in parts_to_load.split(" ") {
                    if part_name.trim().is_empty() {
                        continue;
                    }
                    self.load_part(part_name)?;
                }
            }
            Err(err) => {
                // no parts to load
            }
        }

        debug!("MIZE INIT DONE");
        Ok(())
    }

    pub fn with_config(config: ItemData) -> MizeResult<Mize> {
        trace!("[ {} ] Instance::with_config()", "CALL".yellow());
        trace!("config: {}", config);
        println!("here ....");

        let mut mize = Mize::empty()?;

        let mut opts = mize.config_opts.lock().unwrap();
        let mut config = config.clone();
        for mut path in config.get_paths_recursive()? {
            if path.starts_with("/") {
                path.remove(0);
            }
            let path_split = path
                .split("/")
                .map(|s| s.to_owned())
                .collect::<Vec<String>>();
            let path_string = path_split.join(".");
            if let Ok(val) = config.get_path(path_split) {
                let opt = ConfigOpt {
                    name: path.clone(),
                    val: Some(val),
                    thunk: None,
                };
                opts.insert(path_string, opt);
            }
        }
        drop(opts);

        mize.init()?;

        Ok(mize)
    }

    pub fn migrate_to_store(&self, new_store: Box<dyn Store>) -> MizeResult<()> {
        info!("MIGRATING");
        let mut old_store = self.store.lock()?;

        let id = self.id_from_string("0".to_owned())?;
        let inst_data = old_store.get_value_data_full(id.clone())?;
        new_store.set(id, inst_data.to_owned())?;

        for id in old_store.id_iter()? {
            let data = old_store.get_value_data_full(self.id_from_string(id?)?)?;

            let id_of_new_store = new_store.new_id()?;
            new_store.set(self.id_from_string(id_of_new_store)?, data.to_owned())?;
        }

        *old_store = new_store;

        Ok(())
    }

    pub fn new_item(&self) -> MizeResult<Item> {
        if self.get_namespace()? != self.get_self_namespace()? {
            // need to send create msg and wait for it
            let mut connection = self.get_connection_by_ns(self.get_namespace()?)?;

            let msg = MizeMessage::new_create(connection.id);

            connection.send(msg)?;

            let (tx, rx) = bounded::<MizeId>(1);

            let mut msg_wait_inner = self.create_msg_wait.lock()?;
            *msg_wait_inner = Some(tx);
            drop(msg_wait_inner);

            let id = rx.recv()?;
            println!("new_item namespace: {:?}", id.namespace());

            return Ok(Item::new(id, self));
        }

        let store_inner = self.store.lock()?;
        let id = self.id_from_string(store_inner.new_id()?)?;
        return Ok(Item::new(id, self));
    }

    pub fn get<I: IntoMizeId>(&self, id: I) -> MizeResult<Item> {
        let id = id.to_mize_id(self)?;
        return Ok(Item::new(id, &self));
    }

    pub fn set<I: IntoMizeId, V: Into<ItemData>>(&self, id: I, value: V) -> MizeResult<()> {
        let id = id.to_mize_id(self)?;
        self.op_tx.send(Operation::Set(id, value.into(), None));
        Ok(())
    }

    pub fn set_blocking<I: IntoMizeId, V: Into<ItemData>>(
        &self,
        id: I,
        value: V,
    ) -> MizeResult<()> {
        handle_operation(
            &mut Operation::Set(id.to_mize_id(self)?, value.into(), None),
            self,
        )?;
        Ok(())
    }

    pub fn sub<I: IntoMizeId>(&self, id: I, sub: Subscription) -> MizeResult<()> {
        let mut subs_inner = self.subs.lock()?;
        let id = id.to_mize_id(self)?;
        match subs_inner.get_mut(&id) {
            Some(vec) => {
                vec.push(sub);
            }
            None => {
                subs_inner.insert(id.clone(), vec![sub]);
            }
        }

        // if we are not the owner of this item, send a sub msg to them
        if !self.we_are_namespace()? {
            let con = self.get_connection_by_ns(id.namespace())?;
            let msg = MizeMessage::new_sub(id, con.id);
            con.send(msg)?;
        }

        Ok(())
    }

    pub fn new_id<T: IntoMizeId>(&self, value: T) -> MizeResult<MizeId> {
        value.to_mize_id(self)
    }

    pub fn id_from_string(&self, string: String) -> MizeResult<MizeId> {
        let vec_string: Vec<String> = string
            .split("/")
            .map(|v| v.to_owned())
            .filter(|el| el.as_str() != "")
            .collect();
        self.id_from_vec_string(vec_string)
    }

    pub fn id_from_vec_string(&self, mut vec_string: Vec<String>) -> MizeResult<MizeId> {
        let id_pool_inner = self.id_pool.lock()?;
        let namespace_inner = self.namespace.lock()?;
        let first_el = vec_string
            .first_mut()
            .ok_or(mize_err!("MizeId was empty"))?;

        let id = if first_el.contains(":") {
            // first el is a namespace + store_part
            let new_first_el = first_el.clone();
            let vec: Vec<&str> = new_first_el.split(":").collect();
            let ns_part = vec
                .iter()
                .nth(0)
                .ok_or(mize_err!("should really not happen"))?;
            let store_part = vec.iter().nth(1).ok_or(mize_err!(
                "mizeid was like 'namespace:/hi', why are you doing that"
            ))?;
            *first_el = store_part.to_owned().to_owned();

            MizeId {
                path: id_pool_inner.get(vec_string),
                namespace: self.namespace_from_string(ns_part.to_owned().to_owned())?,
            }
        } else {
            MizeId {
                path: id_pool_inner.get(vec_string),
                namespace: namespace_inner.clone(),
            }
        };
        trace!("new MizeId made: {:?}", id);

        Ok(id)
    }

    pub fn load_part(&mut self, name: &str) -> MizeResult<()> {
        if let Ok(path) = self
            .get_config(&format!("part_dir.{}", name))?
            .value_string()
        {
            crate::platform::any::load_part(self, name, Some(path))
        } else {
            crate::platform::any::load_part(self, name, None)
        }
    }

    pub fn fetch_part(&mut self, name: &str) -> MizeResult<String> {
        // platform specific way to fetch a module
        crate::platform::any::fetch_part(self, name)
    }

    pub fn load_part_at(&mut self, name: &str, path: String) -> MizeResult<()> {
        // platform specific init code
        crate::platform::any::load_part(self, name, Some(path))
    }

    pub fn namespace_from_string(&self, ns_str: String) -> MizeResult<Namespace> {
        let namespace_pool_inner = self.namespace_pool.lock()?;
        let namespace = Namespace(namespace_pool_inner.get(ns_str));
        Ok(namespace)
    }

    pub fn set_namespace(&self, ns: Namespace) -> MizeResult<()> {
        let mut namespace_inner = self.namespace.lock()?;
        *namespace_inner = ns;

        Ok(())
    }

    pub fn get_namespace(&self) -> MizeResult<Namespace> {
        let mut namespace_inner = self.namespace.lock()?;
        return Ok(namespace_inner.clone());
    }

    pub fn get_self_namespace(&self) -> MizeResult<Namespace> {
        let mut self_namespace_inner = self.self_namespace.lock()?;
        return Ok(self_namespace_inner.clone());
    }

    pub fn we_are_namespace(&self) -> MizeResult<bool> {
        Ok(self.get_namespace()? == self.get_self_namespace()?)
    }

    pub fn add_conn_listener<T: ConnListener + 'static>(&mut self, listener: T) -> MizeResult<()> {
        let mut instance_clone = self.clone();
        self.spawn_background("some_listener", move || listener.listen(instance_clone));
        Ok(())
    }

    pub fn new_connection(&self, tx: Sender<MizeMessage>) -> MizeResult<u64> {
        let mut conn_inner = self.connections.lock()?;
        let mut next_con_id = self.next_con_id.lock()?;
        let old_next_con_id = *next_con_id;

        let connection = Connection {
            id: next_con_id.to_owned(),
            tx,
            ns: None,
        };
        conn_inner.push(connection);
        *next_con_id += 1;
        Ok(old_next_con_id)
    }

    pub fn new_connection_join_namespace(&self, tx: Sender<MizeMessage>) -> MizeResult<u64> {
        let conn_id = self.new_connection(tx)?;

        let ns_of_peer_str = self
            .get(format!(
                "inst/con_by_id/{}/peer/self/config/namespace",
                conn_id
            ))?
            .value_string()?;
        let ns_of_peer = self.namespace_from_string(ns_of_peer_str)?;

        self.connection_set_namespace(conn_id, ns_of_peer.clone());
        self.set_namespace(ns_of_peer);

        Ok(conn_id)
    }

    pub fn connection_set_namespace(&self, conn_id: u64, namespace: Namespace) -> MizeResult<()> {
        let mut connection = self.get_connection(conn_id)?;
        connection.ns = Some(namespace);
        self.set_connection(conn_id, connection);
        Ok(())
    }

    pub fn got_msg(&self, msg: MizeMessage) -> MizeResult<()> {
        Ok(self.op_tx.send(Operation::Msg(msg))?)
    }

    pub fn report_err(&self, err: MizeError) {
      #[cfg(feature = "target-js")] unsafe {
        use wasm_bindgen::prelude::wasm_bindgen;
        #[wasm_bindgen]
        extern "C" {
            #[wasm_bindgen(js_namespace = console)]
            fn log(s: &str);
        }
        
        macro_rules! console_log {
            // Note that this is using the `log` function imported above during
            // `bare_bones`
            ($($t:tt)*) => ({ log(&format_args!($($t)*).to_string())})
        }
        console_log!("reported_err: {:?}", err);
      }
        err.log();
    }

    fn set_connection(&self, conn_id: u64, new_connection: Connection) -> MizeResult<()> {
        let mut conn_inner = self.connections.lock()?;

        for connection in conn_inner.iter_mut() {
            if connection.id == conn_id {
                *connection = new_connection;
                return Ok(());
            }
        }

        return Err(mize_err!(
            "Connection with id {} not known to instance",
            conn_id
        ));
        Ok(())
    }

    pub fn get_connection(&self, conn_id: u64) -> MizeResult<Connection> {
        let mut conn_inner = self.connections.lock()?;

        for connection in conn_inner.iter() {
            if connection.id == conn_id {
                return Ok(connection.clone());
            }
        }

        return Err(mize_err!(
            "Connection with id {} not known to instance",
            conn_id
        ));
    }

    pub fn get_connection_by_ns(&self, ns: Namespace) -> MizeResult<Connection> {
        let mut conn_inner = self.connections.lock()?;

        for connection in conn_inner.iter() {
            if connection.ns == Some(ns.clone()) {
                return Ok(connection.clone());
            }
        }

        return Err(mize_err!(
            "Connection with namespace {} not known to instance",
            ns.as_string()
        ));
    }

    pub fn spawn_and_wait(
        &mut self,
        name: &str,
        func: impl FnOnce() -> MizeResult<()> + Send + 'static,
    ) -> MizeResult<()> {
        let mize_clone = self.clone();
        let mut threads_inner = self.threads.lock()?;
        let mut next_thread_id = self.next_thread_id.lock()?;

        let my_thread_id_no_mutex_guard = *next_thread_id;
        let thread_mutex = self.threads.clone();
        let name_to_move = name.to_owned();
        let to_spawn = move || -> MizeResult<()> {
            debug!("spawning thread: {}", name_to_move);
            let my_thread_id = my_thread_id_no_mutex_guard;

            if let Err(err) = func() {
                mize_clone.report_err(err);
            }

            //let mut threads_inner = thread_mutex.lock()?;
            /*
            *threads_inner = threads_inner
                .clone()
                .into_iter()
                .filter(|el| match el {
                    (my_thread_id, _) => false,
                    (_, _) => true,
                })
                .collect();
                 */
            debug!("thread '{}' stopped", name_to_move);
            Ok(())
        };

        *next_thread_id += 1;

        #[cfg(feature = "target-os")]
        let handle = thread::spawn(move || to_spawn());

        #[cfg(feature = "target-os")]
        threads_inner.push((*next_thread_id, name.to_owned(), Some(handle)));

        #[cfg(feature = "target-wasm ")]
        {
            //console_log!("in instance::spawn with wasm target")
        }
        //NOT WELL SUPPORTED
        //crate::platform::wasm::wasm_spawn(to_spawn)?;

        Ok(())
    }

    pub fn spawn_background(
        &mut self,
        name: &str,
        func: impl FnOnce() -> MizeResult<()> + Send + 'static,
    ) -> MizeResult<()> {
        let mut threads_inner = self.threads.lock()?;
        let mut next_thread_id = self.next_thread_id.lock()?;

        let my_thread_id_no_mutex_guard = *next_thread_id;
        let thread_mutex = self.threads.clone();
        let name_to_move = name.to_owned();
        let to_spawn = move || -> () {
            debug!("spawning thread: {}", name_to_move);
            let my_thread_id = my_thread_id_no_mutex_guard;

            let res = func();
            if let Err(e) = res {
                e.log();
            }

            //let mut threads_inner = thread_mutex.lock()?;
            /*
            *threads_inner = threads_inner
                .clone()
                .into_iter()
                .filter(|el| match el {
                    (my_thread_id, _) => false,
                    (_, _) => true,
                })
                .collect();
                 */
            debug!("thread '{}' stopped", name_to_move);
        };

        *next_thread_id += 1;

        #[cfg(feature = "target-os")]
        thread::spawn(move || to_spawn());

        threads_inner.push((*next_thread_id, name.to_owned(), None));

        #[cfg(feature = "target-wasm ")]
        {
            //console_log!("in instance::spawn with wasm target")
        }
        //NOT WELL SUPPORTED
        //crate::platform::wasm::wasm_spawn(to_spawn)?;

        Ok(())
    }

    pub fn give_msg_wait(&self, id: MizeId) -> MizeResult<ItemData> {
        let mut give_msg_wait_inner = self.give_msg_wait.lock()?;

        let (tx, rx) = bounded::<ItemData>(1);

        let vec = match give_msg_wait_inner.get_mut(&id) {
            Some(vec) => vec,
            None => {
                give_msg_wait_inner.insert(id.clone(), Vec::new());
                give_msg_wait_inner.get_mut(&id).unwrap()
            }
        };

        vec.push(tx);

        // so that another thread can also give_msg_wait(), while we wait in the recv() of rx
        drop(vec);
        drop(give_msg_wait_inner);

        let data = rx.recv()?;

        return Ok(data);
    }

    #[cfg(feature = "async")]
    pub fn spawn_async<F: Future<Output = impl Send + 'static> + Send + 'static>(
        &mut self,
        name: &str,
        func: F,
    ) -> MizeResult<()> {
        let mut threads_inner = self.threads.lock()?;
        let mut next_thread_id = self.next_thread_id.lock()?;

        threads_inner.push((*next_thread_id, name.to_owned(), None));
        let runtime_inner = self.runtime.lock().unwrap();
        runtime_inner.spawn(func);

        *next_thread_id += 1;

        Ok(())
    }

    #[cfg(feature = "async")]
    pub fn async_get_handle(&self) -> Handle {
        let runtime_inner = self.runtime.lock().unwrap();
        let handle = runtime_inner.handle().to_owned();
        handle
    }

    #[cfg(feature = "async")]
    pub fn spawn_async_blocking<
        F: Future<Output = impl Send + Sync + 'static> + Send + Sync + 'static,
    >(
        &mut self,
        name: &str,
        func: F,
    ) -> F::Output {
        let mut threads_inner = self
            .threads
            .lock()
            .expect("mutex lock failed in spawn_async_blocking");
        let mut next_thread_id = self
            .next_thread_id
            .lock()
            .expect("mutex lock failed in spawn_async_blocking");

        threads_inner.push((*next_thread_id, name.to_owned(), None));
        let runtime_inner = self.runtime.lock().unwrap();
        let handle = runtime_inner.handle().to_owned();
        *next_thread_id += 1;

        drop(runtime_inner);
        drop(threads_inner);
        drop(next_thread_id);

        let result = handle.block_on(func);

        return result;
    }

    pub fn wait(&self) {
        info!("Instance main thread waiting");
        loop {
            thread::sleep_ms(10000000)
        }
    }

    pub fn report_error(err: MizeError) {
        err.log();
    }

    pub fn get_config(&mut self, name: &str) -> MizeResult<ItemData> {
        let mut config_opts = self.config_opts.lock().unwrap();

        let opt = config_opts
            .get_mut(name)
            .ok_or_else(|| mize_err!("Config opt for {name} not in config_opts"))?;

        // get the cached value
        if let Some(val) = opt.val.clone() {
            //println!("get_config: {name} has cached value: {val}");
            return Ok(val);
        }

        // Evaluate the thunk
        let thunk = opt
            .thunk
            .take()
            .ok_or_else(|| mize_err!("ConfigOpt {name} does not have a thunk"))?;
        let result = thunk();

        // Cache the result
        opt.val = Some(result.clone());

        return Ok(result);
    }

    pub fn new_opt(&mut self, name: &str) -> ConfigOptNameAndMize {
        let mut config_opts = self.config_opts.lock().unwrap();
        match config_opts.get_mut(name) {
            Some(opt) => {}
            None => {
                let opt = ConfigOpt {
                    name: name.to_owned(),
                    val: None,
                    thunk: None,
                };
                config_opts.insert(name.to_string(), opt);
            }
        }
        ConfigOptNameAndMize {
            name: name.to_string(),
            mize: self.clone(),
        }
    }

    pub fn run(&mut self) -> MizeResult<()> {
        let part_names = self.part_names();
        for part_name in part_names {
            let mut part = self.get_part(part_name)?;
            //println!("running part {part_name}");
            part.run(&mut self.clone())?;
        }
        let mut threads_inner = self.threads.lock().unwrap();
        for (id, name, handle) in threads_inner.drain(..) {
            if let Some(handle) = handle {
                handle.join().unwrap()?;
            }
        }
        Ok(())
    }

    pub fn get_part_native<T: MizePart + Send + Sync + 'static>(
        &mut self,
        name: &str,
    ) -> MizeResult<MizePartGuard<T>> {
        let mut dyn_guard = self.get_part(name)?;
        let part = dyn_guard.part.take().unwrap();
        drop(dyn_guard);
        let concrete_part = part
            .into_any()
            .downcast::<T>()
            .map_err(|_| mize_err!("failed to downcast"))?;
        Ok(MizePartGuard {
            mize: self.clone(),
            part: Some(*concrete_part),
        })
    }
    pub fn add_name_only_part(&mut self, name: &'static str) {
        let part = NameOnlyPart {
            mize: self.clone(),
            name,
        };
        self.add_part(Box::new(part));
    }
    pub fn id_path(&self, id: &MizeId) -> MizeResult<String> {
      Ok(id.path().join("/"))
    }
}

#[derive(Default)]
struct NameOnlyPart {
    mize: Mize,
    name: &'static str,
}

impl MizePart for NameOnlyPart {}
impl MizePartGenerated for NameOnlyPart {
    fn as_any_generated(&self) -> &dyn Any {
        self.as_any()
    }
    fn as_any_mut_generated(&mut self) -> &mut dyn Any {
        self.as_any_mut()
    }
    fn get_mize_generated(&mut self) -> &mut Mize {
        &mut self.mize
    }
    fn into_any_generated(self: Box<Self>) -> Box<dyn Any> {
        self.into_any()
    }
    fn name_generated(&self) -> &'static str {
        self.name
    }
}

impl fmt::Debug for Mize {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Mize Instance with subs: {:?}", self.subs,)
    }
}

impl Default for Mize {
    fn default() -> Self {
        Self::empty().unwrap()
    }
}