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import { type EventObject, on, type RemoveListener, send, size } from "../event";
import { writable } from "../readable";
import { type ReadableProvider, type OwnedWritable, type Readable } from "../typings";
import { onDisposeValue, type OnDisposeValue } from "./utils";
export interface ReactiveSetChanged<V> {
readonly upsert: readonly V[];
readonly delete: readonly V[];
}
interface OnChanged<V> extends BatchTask<EventObject<ReactiveSetChanged<V>>> {
readonly upsert_: Set<V>;
readonly delete_: Set<V>;
}
export class OwnedReactiveSet<V> extends Set<V> implements ReadableProvider<ReadonlyReactiveSet<V>> {
/**
* A Readable that emits the set itself whenever it changes.
*/
public get $(): Readable<ReadonlyReactiveSet<V>> {
return (this._$ ??= writable(this, { equal: false }));
}
/**
* Subscribe to changes in the set.
*
* @param fn - The function to call when the set is changed.
* @returns A disposer function to unsubscribe from the event.
*/
public onChanged(fn: (changed: ReactiveSetChanged<V>) => void): RemoveListener {
return on(
(this._onChanged_ ??= {
delete_: new Set<V>(),
upsert_: new Set<V>(),
task_: () => {
if (this._onChanged_ && size(this._onChanged_)) {
const { upsert_, delete_ } = this._onChanged_;
if (upsert_.size > 0 || delete_.size > 0) {
const changedData = {
upsert: [...upsert_],
delete: [...delete_],
};
upsert_.clear();
delete_.clear();
send(this._onChanged_, changedData);
}
} else {
this._onChanged_ = null;
}
},
}),
fn,
);
}
/**
* Subscribe to events when a value is needed to be disposed.
*
* A value is considered for disposal when:
* - it is deleted from the set.
* - it is replaced by another value (the old value is removed).
* - it is cleared from the set.
* - the set is disposed.
*
* @param fn - The function to call when a value is needed to be disposed.
* @returns A disposer function to unsubscribe from the event.
*/
public readonly onDisposeValue = onDisposeValue;
public constructor(values?: Iterable<V> | null) {
super();
if (values) {
for (const value of values) {
super.add(value);
}
}
}
public dispose(): void {
if (this._disposed_) return;
if (process.env.NODE_ENV !== "production") {
this._disposed_ = new Error("[embra] ReactiveSet disposed at:");
} else {
this._disposed_ = true;
}
if (this.onDisposeValue_) {
const { delete_ } = this.onDisposeValue_;
for (const value of this.values()) {
delete_.add(value);
}
if (delete_.size) {
const isBatchTop = batchStart();
tasks.add(this.onDisposeValue_);
isBatchTop && batchFlush();
}
}
this._$ = this._onChanged_ = this.onDisposeValue_ = null;
}
public override add(value: V): this {
if (!this.has(value)) {
const isBatchTop = batchStart();
this.onDisposeValue_?.delete_.delete(value);
if (this._onChanged_) {
this._onChanged_.upsert_.add(value);
this._onChanged_.delete_.delete(value);
tasks.add(this._onChanged_);
}
super.add(value);
this._notify_();
isBatchTop && batchFlush();
}
return this;
}
public override delete(value: V): boolean {
if (this.has(value)) {
const isBatchTop = batchStart();
if (this.onDisposeValue_) {
this.onDisposeValue_.delete_.add(value);
tasks.add(this.onDisposeValue_);
}
if (this._onChanged_) {
this._onChanged_.delete_.add(value);
this._onChanged_.upsert_.delete(value);
tasks.add(this._onChanged_);
}
this._notify_();
isBatchTop && batchFlush();
}
return super.delete(value);
}
public override clear(): void {
if (this.size) {
const isBatchTop = batchStart();
if (this.onDisposeValue_ || this._onChanged_) {
for (const value of this) {
if (this.onDisposeValue_) {
this.onDisposeValue_.delete_.add(value);
tasks.add(this.onDisposeValue_);
}
if (this._onChanged_) {
this._onChanged_.delete_.add(value);
this._onChanged_.upsert_.delete(value);
tasks.add(this._onChanged_);
}
}
}
super.clear();
this._notify_();
isBatchTop && batchFlush();
}
}
/** @internal */
private _disposed_?: Error | true;
/** @internal */
private _$?: OwnedWritable<this> | null;
/** @internal */
private _onChanged_?: null | OnChanged<V>;
/** @internal */
public onDisposeValue_?: null | OnDisposeValue<V>;
/** @internal */
private _notify_() {
if (this._disposed_) {
console.error(new Error("disposed"));
if (process.env.NODE_ENV !== "production") {
console.error(this._disposed_);
}
}
this._$?.set(this);
}
}
export type ReactiveSet<V> = Omit<OwnedReactiveSet<V>, "dispose">;
export interface ReadonlyReactiveSet<V> extends ReadonlySet<V> {
readonly $: Readable<ReadonlySet<V>>;
/**
* Subscribe to changes in the set.
*
* @param fn - The function to call when the set is changed.
* @returns A disposer function to unsubscribe from the event.
*/
onChanged(fn: (changed: ReactiveSetChanged<V>) => void): RemoveListener;
/**
* Subscribe to events when a value is needed to be disposed.
*
* A value is considered for disposal when:
* - it is deleted from the set.
* - it is replaced by another value (the old value is removed).
* - it is cleared from the set.
* - the set is disposed.
*
* @param fn - The function to call when a value is needed to be disposed.
* @returns A disposer function to unsubscribe from the event.
*/
onDisposeValue(fn: (value: V) => void): RemoveListener;
}
export const reactiveSet = <V>(values?: Iterable<V> | null): OwnedReactiveSet<V> => new OwnedReactiveSet(values);
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