use std::any::TypeId;

use mlua::{AnyUserData, ExternalError, Function, Lua};
use tokio::process::{ChildStderr, ChildStdin, ChildStdout};
use yazi_binding::{Id, Permit, PermitRef, deprecate};
use yazi_proxy::{AppProxy, HIDER};

use super::Utils;

impl Utils {
	pub(super) fn id(lua: &Lua) -> mlua::Result<Function> {
		lua.create_function(|_, r#type: mlua::String| {
			Ok(Id(match r#type.as_bytes().as_ref() {
				b"app" => *yazi_dds::ID,
				b"ft" => yazi_fs::FILES_TICKET.next(),
				_ => Err("Invalid id type".into_lua_err())?,
			}))
		})
	}

	pub(super) fn drop(lua: &Lua) -> mlua::Result<Function> {
		lua.create_function(|_, ud: AnyUserData| {
			match ud.type_id() {
				Some(t) if t == TypeId::of::<ChildStdin>() => {}
				Some(t) if t == TypeId::of::<ChildStdout>() => {}
				Some(t) if t == TypeId::of::<ChildStderr>() => {}
				Some(t) => Err(format!("Cannot drop userdata of type {t:?}").into_lua_err())?,
				None => Err("Cannot drop scoped userdata".into_lua_err())?,
			};
			ud.destroy()
		})
	}

	pub(super) fn hide(lua: &Lua) -> mlua::Result<Function> {
		lua.create_async_function(|lua, ()| async move {
			deprecate!(lua, "`ya.hide()` is deprecated, use `ui.hide()` instead, in your {}\nSee #2939 for more details: https://github.com/sxyazi/yazi/pull/2939");

			if lua.named_registry_value::<PermitRef<fn()>>("HIDE_PERMIT").is_ok_and(|h| h.is_some()) {
				return Err("Cannot hide while already hidden".into_lua_err());
			}

			let permit = HIDER.acquire().await.unwrap();
			AppProxy::stop().await;

			lua.set_named_registry_value("HIDE_PERMIT", Permit::new(permit, AppProxy::resume as fn()))?;
			lua.named_registry_value::<AnyUserData>("HIDE_PERMIT")
		})
	}
}