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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use deno_core::futures::channel::mpsc;use deno_runtime::deno_napi::*;use std::mem::forget;use std::sync::mpsc::channel;
pub struct TsFn {  pub env: *mut Env,  pub maybe_func: Option<v8::Global<v8::Function>>,  pub maybe_call_js_cb: Option<napi_threadsafe_function_call_js>,  pub context: *mut c_void,  pub thread_counter: usize,  sender: mpsc::UnboundedSender<PendingNapiAsyncWork>,  tsfn_sender: mpsc::UnboundedSender<ThreadSafeFunctionStatus>,}
impl TsFn {  pub fn acquire(&mut self) -> Result {    self.thread_counter += 1;    Ok(())  }
  pub fn release(mut self) -> Result {    self.thread_counter -= 1;    if self.thread_counter == 0 {      self        .tsfn_sender        .unbounded_send(ThreadSafeFunctionStatus::Dead)        .map_err(|_| Error::GenericFailure)?;      drop(self);    } else {      forget(self);    }    Ok(())  }
  pub fn call(&self, data: *mut c_void, is_blocking: bool) {    let js_func = self.maybe_func.clone();    let (tx, rx) = channel();
    if let Some(call_js_cb) = self.maybe_call_js_cb {      let context = self.context;      let env = self.env;      let call = Box::new(move || {        let scope = &mut unsafe { (*env).scope() };        match js_func {          Some(func) => {            let func: v8::Local<v8::Value> =              func.open(scope).to_object(scope).unwrap().into();            unsafe {              call_js_cb(env as *mut c_void, func.into(), context, data)            };          }          None => {            unsafe {              call_js_cb(env as *mut c_void, std::mem::zeroed(), context, data)            };          }        }
        // Receiver might have been already dropped        let _ = tx.send(());      });      // This call should never fail      self.sender.unbounded_send(call).unwrap();    } else if let Some(_js_func) = js_func {      let call = Box::new(move || {        // TODO: func.call        // let func = js_func.open(scope);        // Receiver might have been already dropped        let _ = tx.send(());      });      // This call should never fail      self.sender.unbounded_send(call).unwrap();    }
    if is_blocking {      rx.recv().unwrap();    }  }}
#[napi_sym::napi_sym]fn napi_create_threadsafe_function(  env: *mut Env,  func: napi_value,  _async_resource: napi_value,  _async_resource_name: napi_value,  _max_queue_size: usize,  initial_thread_count: usize,  _thread_finialize_data: *mut c_void,  _thread_finalize_cb: napi_finalize,  context: *mut c_void,  maybe_call_js_cb: Option<napi_threadsafe_function_call_js>,  result: *mut napi_threadsafe_function,) -> Result {  let env_ref = env.as_mut().ok_or(Error::GenericFailure)?;  if initial_thread_count == 0 {    return Err(Error::InvalidArg);  }  let maybe_func = func    .map(|value| {      let func = v8::Local::<v8::Function>::try_from(value)        .map_err(|_| Error::FunctionExpected)?;      Ok(v8::Global::new(&mut env_ref.scope(), func))    })    .transpose()?;
  let tsfn = TsFn {    maybe_func,    maybe_call_js_cb,    context,    thread_counter: initial_thread_count,    sender: env_ref.async_work_sender.clone(),    tsfn_sender: env_ref.threadsafe_function_sender.clone(),    env,  };
  env_ref    .threadsafe_function_sender    .unbounded_send(ThreadSafeFunctionStatus::Alive)    .map_err(|_| Error::GenericFailure)?;  *result = transmute::<Box<TsFn>, _>(Box::new(tsfn));
  Ok(())}
#[napi_sym::napi_sym]fn napi_acquire_threadsafe_function(  tsfn: napi_threadsafe_function,  _mode: napi_threadsafe_function_release_mode,) -> Result {  let tsfn: &mut TsFn = &mut *(tsfn as *mut TsFn);  tsfn.acquire()?;
  Ok(())}
#[napi_sym::napi_sym]fn napi_unref_threadsafe_function(  _env: &mut Env,  tsfn: napi_threadsafe_function,) -> Result {  let _tsfn: &TsFn = &*(tsfn as *const TsFn);
  Ok(())}
/// Maybe called from any thread.#[napi_sym::napi_sym]pub fn napi_get_threadsafe_function_context(  func: napi_threadsafe_function,  result: *mut *const c_void,) -> Result {  let tsfn: &TsFn = &*(func as *const TsFn);  *result = tsfn.context;  Ok(())}
#[napi_sym::napi_sym]fn napi_call_threadsafe_function(  func: napi_threadsafe_function,  data: *mut c_void,  is_blocking: napi_threadsafe_function_call_mode,) -> Result {  let tsfn: &TsFn = &*(func as *const TsFn);  tsfn.call(data, is_blocking != 0);  Ok(())}
#[napi_sym::napi_sym]fn napi_ref_threadsafe_function() -> Result {  // TODO  Ok(())}
#[napi_sym::napi_sym]fn napi_release_threadsafe_function(  tsfn: napi_threadsafe_function,  _mode: napi_threadsafe_function_release_mode,) -> Result {  let tsfn: Box<TsFn> = Box::from_raw(tsfn as *mut TsFn);  tsfn.release()?;
  Ok(())}