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import { ElementNotFound, NotABrowser } from "./lustre.mjs";
import {
Dispatch,
Shutdown,
Debug,
ForceModel,
} from "./lustre/internals/runtime.mjs";
import { morph } from "./vdom.ffi.mjs";
import { Ok, Error, isEqual } from "./gleam.mjs";
export class LustreClientApplication {
#root = null;
#queue = [];
#effects = [];
#didUpdate = false;
#isComponent = false;
#model = null;
#update = null;
#view = null;
static start(flags, selector, init, update, view) {
if (!is_browser()) return new Error(new NotABrowser());
const root =
selector instanceof HTMLElement
? selector
: document.querySelector(selector);
if (!root) return new Error(new ElementNotFound(selector));
const app = new LustreClientApplication(init(flags), update, view, root);
return new Ok((msg) => app.send(msg));
}
constructor(
[model, effects],
update,
view,
root = document.body,
isComponent = false,
) {
this.#model = model;
this.#update = update;
this.#view = view;
this.#root = root;
this.#effects = effects.all.toArray();
this.#didUpdate = true;
this.#isComponent = isComponent;
window.requestAnimationFrame(() => this.#tick());
}
send(action) {
switch (true) {
case action instanceof Dispatch: {
this.#queue.push(action[0]);
this.#tick();
return;
}
case action instanceof Shutdown: {
this.#shutdown();
return;
}
case action instanceof Debug: {
this.#debug(action[0]);
return;
}
default:
return;
}
}
emit(event, data) {
this.#root.dispatchEvent(
new CustomEvent(event, {
bubbles: true,
detail: data,
composed: true,
}),
);
}
#tick() {
this.#flush_queue();
const vdom = this.#view(this.#model);
const dispatch = (handler) => (e) => {
const result = handler(e);
if (result instanceof Ok) {
this.send(new Dispatch(result[0]));
}
};
this.#didUpdate = false;
this.#root = morph(this.#root, vdom, dispatch, this.#isComponent);
}
#flush_queue(iterations = 0) {
while (this.#queue.length) {
const [next, effects] = this.#update(this.#model, this.#queue.shift());
this.#didUpdate ||= !isEqual(this.#model, next);
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());
}
}
}
#debug(action) {
switch (true) {
case action instanceof ForceModel: {
const vdom = this.#view(action[0]);
const dispatch = (handler) => (e) => {
const result = handler(e);
if (result instanceof Ok) {
this.send(new Dispatch(result[0]));
}
};
this.#queue = [];
this.#effects = [];
this.#didUpdate = false;
this.#root = morph(this.#root, vdom, dispatch, this.#isComponent);
}
}
}
#shutdown() {
this.#root.remove();
this.#root = null;
this.#model = null;
this.#queue = [];
this.#effects = [];
this.#didUpdate = false;
this.#update = () => {};
this.#view = () => {};
}
}
export const start = (app, selector, flags) =>
LustreClientApplication.start(
flags,
selector,
app.init,
app.update,
app.view,
);
// UTILS -----------------------------------------------------------------------
export const is_browser = () => globalThis.window && window.document;
export const is_registered = (name) =>
is_browser() && !!window.customElements.get(name);
export const prevent_default = (event) => event.preventDefault();
export const stop_propagation = (event) => event.stopPropagation();
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