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import { Ok, isEqual } from "./gleam.mjs";
import {
AddRenderer,
Dispatch,
Event,
RemoveRenderer,
Shutdown,
} from "./lustre/runtime.mjs";
export class LustreServerApplication {
#queue = [];
#effects = [];
#didUpdate = false;
#vdom = null;
#handlers = new Map();
#renderers = new Set();
#model = null;
#update = null;
#view = null;
static start(flags, init, update, view) {
const app = new LustreServerApplication(init(flags), update, view, root);
return new Ok((msg) => app.send(msg));
}
// PUBLIC METHODS ------------------------------------------------------------
constructor([model, effects], update, view) {
this.#model = model;
this.#update = update;
this.#view = view;
this.#vdom = this.#view(this.#model);
this.#effects = effects.all.toArray();
this.#didUpdate = true;
globalThis.queueMicrotask(() => this.#tick());
}
send(action) {
switch (true) {
case action instanceof AddRenderer: {
this.#renderers.add(action[0]);
return;
}
case action instanceof Dispatch: {
this.#queue.push(action[0]);
this.#tick();
return;
}
case action instanceof Event: {
const [event, data] = action;
if (this.#handlers.has(event)) {
const msg = this.#handlers.get(event)(data);
if (msg.isOk()) {
this.#queue.push(msg[0]);
this.#tick();
}
}
}
case action instanceof RemoveRenderer: {
this.#renderers.delete(action[0]);
return;
}
case action instanceof Shutdown: {
this.#shutdown();
return;
}
default:
return;
}
}
// PRIVATE METHODS -----------------------------------------------------------
#tick() {
this.#flush_queue();
if (this.#didUpdate) {
this.#vdom = this.#view(this.#model);
for (const renderer of this.#renderers) {
renderer.render(this.#vdom);
}
}
}
#flush_queue(iterations = 0) {
while (this.#queue.length) {
const [next, effects] = this.#update(this.#model, this.#queue.shift());
this.#model = next;
this.#didUpdate ||= !isEqual(this.#model, next);
this.#effects = this.#effects.concat(effects.all.toArray());
}
while (this.#effects.length) {
this.#effects.shift()(
(msg) => this.send(new Dispatch(msg)),
(event, data) => this.emit(event, data)
);
}
if (this.#queue.length) {
if (iterations < 5) {
this.#flush_queue(++iterations);
} else {
window.requestAnimationFrame(() => this.#tick());
}
}
}
#shutdown() {
this.#model = null;
this.#queue = [];
this.#effects = [];
this.#didUpdate = false;
this.#update = () => {};
this.#view = () => {};
this.#vdom = null;
this.#handlers = new Map();
this.#renderers = new Set();
}
}
export const start = (app, selector, flags) =>
LustreClientApplication.start(
flags,
selector,
app.init,
app.update,
app.view
);
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