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import { BACKGROUND_TASK_TYPES, TASK_QUEUE, TASK_STATUS } from "./types";
export type TaskChangeListener = () => void;
const RATE_SAMPLE_FLOOR_MS = 500;
export const FLASH_WINDOW_MS = 2000;
export class TaskQueue {
private tasks: Map<string, TaskEntry> = new Map();
private queues: Map<TaskType, string[]> = new Map();
private activeIds: Map<TaskType, string | null> = new Map();
private aborts: Map<string, AbortController> = new Map();
private history: TaskEntry[] = [];
private listeners: TaskChangeListener[] = [];
private flashTimers: Set<number> = new Set();
static readonly MAX_HISTORY = 50;
/** Clear pending flash-clear timers — call from plugin unload to avoid zombie notifies. */
dispose(): void {
for (const handle of this.flashTimers) window.clearTimeout(handle);
this.flashTimers.clear();
}
registerAbort(id: string, controller: AbortController): void {
const task = this.tasks.get(id);
if (!task) return;
this.aborts.set(id, controller);
task.canCancel = true;
this.notify();
}
onChange(listener: TaskChangeListener): () => void {
this.listeners.push(listener);
return () => {
const idx = this.listeners.indexOf(listener);
if (idx >= 0) this.listeners.splice(idx, 1);
};
}
private notify(): void {
for (const listener of this.listeners) {
listener();
}
}
private typeQueue(type: TaskType): string[] {
let q = this.queues.get(type);
if (!q) {
q = [];
this.queues.set(type, q);
}
return q;
}
enqueue(name: string, type: TaskType, retry?: () => void | Promise<void>): string | null {
if (this.typeQueue(type).length >= TASK_QUEUE.MAX_QUEUED_PER_TYPE) {
return null;
}
const id = `${type}-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`;
const task: TaskEntry = {
id,
name,
type,
status: TASK_STATUS.QUEUED,
progress: 0,
detail: "",
startedAt: Date.now(),
completedAt: null,
error: null,
canCancel: true,
retry,
};
this.tasks.set(id, task);
this.typeQueue(type).push(id);
this.processType(type);
return id;
}
private backgroundActiveCount(): number {
let count = 0;
for (const [type, id] of this.activeIds) {
if (id && BACKGROUND_TASK_TYPES.has(type)) count++;
}
return count;
}
private processType(type: TaskType): void {
if (this.activeIds.get(type)) return;
const q = this.queues.get(type);
if (!q || q.length === 0) return;
if (BACKGROUND_TASK_TYPES.has(type) && this.backgroundActiveCount() >= TASK_QUEUE.MAX_CONCURRENT_BACKGROUND) {
return;
}
const nextId = q.shift()!;
this.activate(nextId);
}
private processAll(): void {
for (const type of this.queues.keys()) {
this.processType(type);
}
}
activate(id: string): void {
const task = this.tasks.get(id);
if (!task) return;
if (task.status !== TASK_STATUS.QUEUED) return;
task.status = TASK_STATUS.ACTIVE;
task.canCancel = this.aborts.has(id);
this.activeIds.set(task.type, id);
this.notify();
}
update(id: string, progress: number, detail?: string, bytes?: { current?: number; total?: number }): void {
const task = this.tasks.get(id);
if (!task) return;
task.progress = progress;
if (detail !== undefined) task.detail = detail;
if (bytes) {
if (bytes.total !== undefined) task.bytesTotal = bytes.total;
if (bytes.current !== undefined) {
const now = Date.now();
const prevBytes = task.bytesCurrent;
const prevAt = task.lastRateAt;
task.bytesCurrent = bytes.current;
if (prevBytes !== undefined && prevAt !== undefined) {
const elapsedMs = now - prevAt;
if (elapsedMs >= RATE_SAMPLE_FLOOR_MS) {
const deltaBytes = bytes.current - prevBytes;
const rate = (deltaBytes / elapsedMs) * 1000;
task.rateBps = rate > 0 ? rate : 0;
task.lastRateAt = now;
}
} else {
task.lastRateAt = now;
}
}
}
this.notify();
}
complete(id: string): void {
const task = this.tasks.get(id);
if (!task) return;
task.status = TASK_STATUS.DONE;
task.progress = 100;
task.completedAt = Date.now();
this.moveToHistory(id);
}
fail(id: string, error?: string): void {
const task = this.tasks.get(id);
if (!task) return;
task.status = TASK_STATUS.FAILED;
task.error = error ?? null;
task.completedAt = Date.now();
this.moveToHistory(id);
}
/**
* Neutral terminal state: the server told us it is already handling this work
* (e.g. a concurrent /api/add for the same source). The task isn't done — the
* original request is still running — and it isn't failed either, so Retry
* would just collide again. Park it in history with a `waiting` status and
* no retry affordance.
*/
markWaiting(id: string, detail?: string): void {
const task = this.tasks.get(id);
if (!task) return;
task.status = TASK_STATUS.WAITING;
if (detail !== undefined) task.detail = detail;
task.completedAt = Date.now();
task.retry = undefined;
this.moveToHistory(id);
}
cancel(id: string): void {
const task = this.tasks.get(id);
if (!task) return;
if (task.status === TASK_STATUS.QUEUED) {
const q = this.queues.get(task.type);
/* v8 ignore next -- a queued task always has its type queue, created on enqueue */
if (q) {
const idx = q.indexOf(id);
/* v8 ignore next -- a queued task is always present in its own queue */
if (idx >= 0) q.splice(idx, 1);
}
this.tasks.delete(id);
this.aborts.delete(id);
this.notify();
return;
}
/* v8 ignore next -- a live task is either QUEUED (handled above) or ACTIVE; terminal states are removed from tasks */
if (task.status === TASK_STATUS.ACTIVE) {
this.aborts.get(id)?.abort();
task.status = TASK_STATUS.CANCELLED;
task.completedAt = Date.now();
this.moveToHistory(id);
}
}
private moveToHistory(id: string): void {
const task = this.tasks.get(id)!;
if (this.activeIds.get(task.type) === id) {
this.activeIds.set(task.type, null);
}
this.aborts.delete(id);
this.history.unshift(task);
if (this.history.length > TaskQueue.MAX_HISTORY) {
this.history.pop();
}
this.tasks.delete(id);
this.notify();
this.scheduleFlashClear();
this.processAll();
}
private scheduleFlashClear(): void {
const handle = window.setTimeout(() => {
this.flashTimers.delete(handle);
this.notify();
}, FLASH_WINDOW_MS);
this.flashTimers.add(handle);
}
get active(): TaskEntry | null {
for (const id of this.activeIds.values()) {
if (id) {
const task = this.tasks.get(id);
/* v8 ignore next -- a non-null active id always has a backing task entry */
if (task) return task;
}
}
return null;
}
/** Returns all currently active tasks across all types. */
/** Returns true if a task of the given type is active or queued. */
hasPending(type: TaskType): boolean {
if (this.activeIds.get(type)) return true;
const q = this.queues.get(type);
return q !== undefined && q.length > 0;
}
get activeAll(): TaskEntry[] {
const result: TaskEntry[] = [];
for (const id of this.activeIds.values()) {
if (id) {
const task = this.tasks.get(id);
/* v8 ignore next -- a non-null active id always has a backing task entry */
if (task) result.push(task);
}
}
return result;
}
get queued(): TaskEntry[] {
const result: TaskEntry[] = [];
for (const q of this.queues.values()) {
for (const id of q) {
const task = this.tasks.get(id);
/* v8 ignore next -- queued ids always have a backing task entry */
if (task) result.push(task);
}
}
return result;
}
get completed(): TaskEntry[] {
return [...this.history];
}
clearHistory(): void {
this.history = [];
this.notify();
}
toJSON(): { history: TaskEntry[] } {
return { history: [...this.history] };
}
loadFromJSON(data: { history?: TaskEntry[] } | undefined): void {
if (!data || !Array.isArray(data.history)) return;
this.history = data.history.slice(0, TaskQueue.MAX_HISTORY);
this.notify();
}
}
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