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use crate::interface::WebScriptInterface; use core::{ ecs::World, state::{State, StateChange}, }; use js_sys::{Function, JsString, Reflect}; use wasm_bindgen::{JsCast, JsValue}; pub trait WebScriptStateScripted { fn on_enter(&mut self, _world: &mut World) {} fn on_exit(&mut self, _world: &mut World) {} fn on_process(&mut self, _world: &mut World) -> Option<String> { None } } pub struct WebScriptBootState { initial_state_name: String, } impl WebScriptBootState { pub fn new(initial_state_name: &str) -> Self { Self { initial_state_name: initial_state_name.to_owned(), } } } impl State for WebScriptBootState { fn on_process(&mut self, _: &mut World) -> StateChange { if WebScriptInterface::is_ready() { return if let Some(result) = WebScriptInterface::build_state(&self.initial_state_name) { StateChange::Swap(Box::new(WebScriptState::new(result))) } else if let Some(result) = WebScriptInterface::build_state_scripted(&self.initial_state_name) { StateChange::Swap(Box::new(WebScriptStateWrapped::new(result))) } else { StateChange::Pop }; } StateChange::None } } pub(crate) struct WebScriptStateWrapped { inner: Box<dyn WebScriptStateScripted>, } impl WebScriptStateWrapped { pub fn new(inner: Box<dyn WebScriptStateScripted>) -> Self { Self { inner } } } impl State for WebScriptStateWrapped { fn on_enter(&mut self, world: &mut World) { WebScriptInterface::set_world(world); self.inner.on_enter(world); } fn on_process(&mut self, world: &mut World) -> StateChange { WebScriptInterface::set_world(world); WebScriptInterface::run_systems(); WebScriptInterface::maintain_entities(world); if let Some(name) = self.inner.on_process(world) { if let Some(result) = WebScriptInterface::build_state(&name) { return StateChange::Swap(Box::new(WebScriptState::new(result))); } else if let Some(result) = WebScriptInterface::build_state_scripted(&name) { return StateChange::Swap(Box::new(WebScriptStateWrapped::new(result))); } } StateChange::None } fn on_exit(&mut self, world: &mut World) { self.inner.on_exit(world); WebScriptInterface::unset_world(); } } pub(crate) struct WebScriptState { context: JsValue, on_enter: Option<Function>, on_process: Option<Function>, on_exit: Option<Function>, } impl WebScriptState { pub fn new(context: JsValue) -> Self { let on_enter = if let Ok(m) = Reflect::get(&context, &JsValue::from_str("onEnter")) { m.dyn_ref::<Function>().cloned() } else { None }; let on_process = if let Ok(m) = Reflect::get(&context, &JsValue::from_str("onProcess")) { m.dyn_ref::<Function>().cloned() } else { None }; let on_exit = if let Ok(m) = Reflect::get(&context, &JsValue::from_str("onExit")) { m.dyn_ref::<Function>().cloned() } else { None }; Self { context, on_enter, on_process, on_exit, } } } impl State for WebScriptState { fn on_enter(&mut self, world: &mut World) { WebScriptInterface::set_world(world); if let Some(on_enter) = &self.on_enter { drop(on_enter.call0(&self.context)); } } fn on_process(&mut self, world: &mut World) -> StateChange { WebScriptInterface::set_world(world); WebScriptInterface::run_systems(); WebScriptInterface::maintain_entities(world); if let Some(on_process) = &self.on_process { if let Ok(result) = on_process.call0(&self.context) { if let Some(result) = result.dyn_ref::<JsString>() { let name = String::from(result); if let Some(result) = WebScriptInterface::build_state(&name) { return StateChange::Swap(Box::new(WebScriptState::new(result))); } else if let Some(result) = WebScriptInterface::build_state_scripted(&name) { return StateChange::Swap(Box::new(WebScriptStateWrapped::new(result))); } } } } StateChange::None } fn on_exit(&mut self, _: &mut World) { if let Some(on_exit) = &self.on_exit { drop(on_exit.call0(&self.context)); } WebScriptInterface::unset_world(); } }