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import { createControllerHost } from '../core/host';
import type {
ChangeDetails,
RuntimeController,
RuntimeEventSource,
Unsubscribe,
} from '../core/types';
import { createControllableValue } from '../state/controllable';
import { listen } from '../dom/dom';
/** Toast visual/announcement lifecycle state. @public */
export type ToastStatus = 'loading' | 'success' | 'error' | 'info';
/** Toast announcement politeness. @public */
export type ToastPoliteness = 'polite' | 'assertive';
/** Causes of toast queue mutations. @public */
export type ToastChangeReason = 'programmatic' | 'timeout' | 'dismiss' | 'promise' | 'update';
/** Public Toast record rendered by consumers. @public */
export interface ToastRecord {
/** Stable deduplication ID. */
readonly id: string;
/** Human-readable announcement and visible message. */
readonly message: string;
/** Semantic lifecycle status. */
readonly status: ToastStatus;
/** Higher priorities sort before lower priorities. */
readonly priority: number;
/** Live-region politeness. */
readonly politeness: ToastPoliteness;
/** Auto-dismiss duration; `null` disables timeout. */
readonly duration: number | null;
/** Monotonic insertion sequence used as deterministic tie-breaker. */
readonly sequence: number;
/** Whether hover/focus has paused the timeout. */
readonly paused: boolean;
}
/** Input used to show or update a Toast. @public */
export interface ToastInput {
/** Optional deduplication ID; generated when omitted. */
readonly id?: string;
/** Human-readable message. */
readonly message: string;
/** Semantic status. @defaultValue `info` */
readonly status?: ToastStatus;
/** Sort priority. @defaultValue `0` */
readonly priority?: number;
/** Live-region politeness. @defaultValue `polite` */
readonly politeness?: ToastPoliteness;
/** Auto-dismiss duration in milliseconds. @defaultValue `5000` */
readonly duration?: number | null;
}
/** Toast queue snapshot. @public */
export interface ToastSnapshot {
/** Visible priority-ordered records. */
readonly visible: readonly ToastRecord[];
/** Waiting priority-ordered records. */
readonly queued: readonly ToastRecord[];
/** Complete deterministic queue. */
readonly all: readonly ToastRecord[];
/** Whether queue state is consumer-owned. */
readonly controlled: boolean;
}
/** Toast mutation event payload. @public */
export interface ToastEvent {
/** Affected record. */
readonly toast: Readonly<ToastRecord>;
/** Typed mutation cause. */
readonly details: ChangeDetails<ToastChangeReason>;
}
/** Toast queue event map. @public */
export interface ToastEvents {
/** Cancellable event emitted before insertion. */
readonly beforeShow: ToastEvent;
/** Event emitted after insertion. */
readonly show: ToastEvent;
/** Event emitted after a record update. */
readonly update: ToastEvent;
/** Event emitted after removal. */
readonly dismiss: ToastEvent;
/** Event emitted for every accepted queue mutation. */
readonly stateChange: ToastEvent;
}
/** Message mapping for promise-backed toasts. @public */
export interface ToastPromiseMessages<TValue> {
/** Message while the promise is pending. */
readonly loading: string;
/** Success message or value-aware formatter. */
readonly success: string | ((value: TValue) => string);
/** Error message or unknown-error formatter. */
readonly error: string | ((error: unknown) => string);
}
/** Toast queue ownership and capacity options. @public */
export interface ToastOptions {
/** Maximum concurrently visible records. @defaultValue `3` */
readonly maxVisible?: number;
/** Consumer-owned record reader. */
readonly getToasts?: () => readonly ToastRecord[];
/** Receives queue mutation requests in controlled mode. */
readonly onToastsChange?: (
toasts: readonly ToastRecord[],
details: ChangeDetails<ToastChangeReason>,
) => void;
/** Subscribes to consumer-owned queue changes. */
readonly subscribeToasts?: (listener: () => void) => Unsubscribe;
}
/** Headless Toast queue controller. @public */
export interface ToastController
extends RuntimeController<ToastSnapshot>, RuntimeEventSource<ToastEvents> {
/** Inserts or updates by ID and returns its stable ID; destroyed controllers return no new ID. */
show(input: ToastInput): string;
/** Partially updates an existing record. */
update(id: string, input: Partial<Omit<ToastInput, 'id'>>): void;
/** Removes a record immediately. */
dismiss(id: string, details?: ChangeDetails<ToastChangeReason>): void;
/** Pauses an auto-dismiss timeout while preserving remaining duration. */
pause(id: string): void;
/** Resumes an auto-dismiss timeout from its preserved remaining duration. */
resume(id: string): void;
/** Pauses on hover/focus and resumes when interaction leaves the rendered toast. */
bindPause(id: string, element: HTMLElement): () => void;
/** Tracks a promise while preserving its original fulfillment or rejection. */
promise<TValue>(
promise: Promise<TValue>,
messages: ToastPromiseMessages<TValue>,
input?: Omit<ToastInput, 'message' | 'status'>,
): Promise<TValue>;
}
/** Creates a priority queue with deterministic ordering, pausable timers, and promise lifecycle. @public */
export function createToast(options: ToastOptions = {}): ToastController {
const maxVisible = Math.max(1, options.maxVisible ?? 3);
const initialRecords = options.getToasts?.() ?? [];
let sequence = initialRecords.reduce((highest, record) => Math.max(highest, record.sequence), 0);
const timers = new Map<
string,
{
readonly timer?: ReturnType<typeof setTimeout>;
readonly started: number;
readonly remaining: number;
}
>();
const sort = (records: readonly ToastRecord[]): readonly ToastRecord[] =>
Object.freeze([...records].sort((a, b) => b.priority - a.priority || a.sequence - b.sequence));
const build = (records: readonly ToastRecord[], controlled: boolean): ToastSnapshot => {
const all = sort(records);
return { visible: all.slice(0, maxVisible), queued: all.slice(maxVisible), all, controlled };
};
const host = createControllerHost<ToastSnapshot, ToastEvents>(
build(initialRecords, options.getToasts !== undefined),
);
let reconcileTimers = (): void => undefined;
const sync = (): void => {
host.update(build(state.get(), state.controlled));
reconcileTimers();
};
let pendingMutation:
| {
readonly type: 'show' | 'update' | 'dismiss';
readonly payload: ToastEvent;
readonly onCommit?: () => void;
}
| undefined;
const commit = (
_records: readonly ToastRecord[],
changeDetails?: ChangeDetails<ToastChangeReason>,
): void => {
if (changeDetails && pendingMutation) pendingMutation.onCommit?.();
sync();
if (!changeDetails || !pendingMutation) return;
const { type, payload } = pendingMutation;
pendingMutation = undefined;
host.emit(type, { ...payload, details: changeDetails });
host.emit('stateChange', { ...payload, details: changeDetails });
};
const state = createControllableValue<readonly ToastRecord[], ToastChangeReason>(
{
defaultValue: [],
...(options.getToasts ? { getValue: options.getToasts } : {}),
...(options.onToastsChange ? { onValueChange: options.onToastsChange } : {}),
...(options.subscribeToasts ? { subscribeValue: options.subscribeToasts } : {}),
},
commit,
);
const clearTimer = (id: string): void => {
const active = timers.get(id);
if (active?.timer) clearTimeout(active.timer);
timers.delete(id);
};
const dismiss = (
id: string,
changeDetails: ChangeDetails<ToastChangeReason> = { reason: 'dismiss' },
): void => {
if (!host.alive()) return;
const record = state.get().find((toast) => toast.id === id);
if (!record) return;
const payload = { toast: record, details: changeDetails };
pendingMutation = { type: 'dismiss', payload, onCommit: () => clearTimer(id) };
const next = state.get().filter((toast) => toast.id !== id);
Eif (state.set(next, changeDetails)) commit(next, changeDetails);
};
const startTimer = (record: ToastRecord, remaining = record.duration): void => {
clearTimer(record.id);
if (remaining === null || remaining <= 0 || record.paused) return;
const started = Date.now();
const timer = setTimeout(() => dismiss(record.id, { reason: 'timeout' }), remaining);
timers.set(record.id, { timer, started, remaining });
};
const stopTimer = (id: string): number | null | undefined => {
const active = timers.get(id);
Iif (!active) return undefined;
if (active.timer) clearTimeout(active.timer);
const remaining = Math.max(0, active.remaining - (Date.now() - active.started));
timers.set(id, { started: Date.now(), remaining });
return remaining;
};
reconcileTimers = (): void => {
Iif (!host.alive()) return;
const records = state.get();
const byId = new Map(records.map((record) => [record.id, record]));
for (const id of [...timers.keys()]) {
const record = byId.get(id);
if (!record) clearTimer(id);
else if (record.paused) stopTimer(id);
}
for (const record of records) {
if (record.paused) continue;
const active = timers.get(record.id);
if (!active?.timer) startTimer(record, active?.remaining ?? record.duration);
}
};
const show = (input: ToastInput): string => {
if (!host.alive()) return input.id ?? '';
const existing = input.id ? state.get().find((toast) => toast.id === input.id) : undefined;
if (existing) {
updateRecord(existing.id, input, { reason: 'update' });
return existing.id;
}
sequence += 1;
const record: ToastRecord = Object.freeze({
id: input.id ?? createRuntimeId('toast'),
message: input.message,
status: input.status ?? 'info',
priority: input.priority ?? 0,
politeness: input.politeness ?? 'polite',
duration: input.duration === undefined ? 5000 : input.duration,
sequence,
paused: false,
});
const payload = { toast: record, details: { reason: 'programmatic' as const } };
if (!host.emit('beforeShow', payload)) return record.id;
pendingMutation = { type: 'show', payload };
const next = [...state.get(), record];
if (state.set(next, payload.details)) commit(next, payload.details);
return record.id;
};
const updateRecord = (
id: string,
input: Partial<Omit<ToastInput, 'id'>>,
changeDetails: ChangeDetails<ToastChangeReason>,
): void => {
if (!host.alive()) return;
const previous = state.get().find((toast) => toast.id === id);
if (!previous) return;
const record: ToastRecord = Object.freeze({
...previous,
...input,
duration: input.duration === undefined ? previous.duration : input.duration,
});
const payload = { toast: record, details: changeDetails };
pendingMutation = { type: 'update', payload, onCommit: () => clearTimer(id) };
const next = state.get().map((toast) => (toast.id === id ? record : toast));
if (state.set(next, changeDetails)) commit(next, changeDetails);
};
const pause = (id: string): void => {
if (!host.alive()) return;
const record = state.get().find((toast) => toast.id === id);
if (!record || record.paused) return;
const active = timers.get(id);
const remaining = active
? Math.max(0, active.remaining - (Date.now() - active.started))
: record.duration;
const paused = Object.freeze({ ...record, paused: true });
const payload = { toast: paused, details: { reason: 'update' as const } };
pendingMutation = {
type: 'update',
payload,
onCommit: () => {
clearTimer(id);
if (remaining !== null) timers.set(id, { started: Date.now(), remaining });
},
};
const next = state.get().map((toast) => (toast.id === id ? paused : toast));
if (state.set(next, payload.details)) commit(next, payload.details);
};
const resume = (id: string): void => {
if (!host.alive()) return;
const record = state.get().find((toast) => toast.id === id);
if (!record?.paused) return;
const remaining = timers.get(id)?.remaining ?? record.duration;
const resumed = Object.freeze({ ...record, paused: false });
const payload = { toast: resumed, details: { reason: 'update' as const } };
pendingMutation = {
type: 'update',
payload,
onCommit: () => {
clearTimer(id);
if (remaining !== null) timers.set(id, { started: Date.now(), remaining });
},
};
const next = state.get().map((toast) => (toast.id === id ? resumed : toast));
if (state.set(next, payload.details)) commit(next, payload.details);
};
host.resources.add(() => state.destroy());
host.resources.add(() => [...timers.keys()].forEach(clearTimer));
sync();
return {
getSnapshot: host.getSnapshot,
subscribe: host.subscribe,
on: host.on,
off: host.off,
once: host.once,
show,
update: (id, input) => updateRecord(id, input, { reason: 'update' }),
dismiss,
pause,
resume,
bindPause(id, element) {
if (!host.alive()) return () => undefined;
const cleanups = [
listen<PointerEvent>(element, 'pointerenter', () => pause(id)),
listen<PointerEvent>(element, 'pointerleave', () => resume(id)),
listen<FocusEvent>(element, 'focusin', () => pause(id)),
listen<FocusEvent>(element, 'focusout', (event) => {
const related = event.relatedTarget;
if (
related &&
typeof related === 'object' &&
'nodeType' in related &&
element.contains(related as Node)
)
return;
resume(id);
}),
];
return host.resources.add(() => cleanups.splice(0).forEach((cleanup) => cleanup()));
},
async promise<TValue>(
promise: Promise<TValue>,
messages: ToastPromiseMessages<TValue>,
input: Omit<ToastInput, 'message' | 'status'> = {},
) {
const id = show({ ...input, message: messages.loading, status: 'loading', duration: null });
try {
const value = await promise;
updateRecord(
id,
{
message:
typeof messages.success === 'function' ? messages.success(value) : messages.success,
status: 'success',
duration: input.duration === undefined ? 5000 : input.duration,
},
{ reason: 'promise' },
);
return value;
} catch (error) {
updateRecord(
id,
{
message: typeof messages.error === 'function' ? messages.error(error) : messages.error,
status: 'error',
politeness: 'assertive',
duration: input.duration === undefined ? 5000 : input.duration,
},
{ reason: 'promise' },
);
throw error;
}
},
destroy: host.destroy,
};
}
|