import { Observable } from "@noya-app/observable";
import { Task } from "./tasks";

export class TaskManager {
  constructor(public options: { maxTasks?: number } = {}) {}

  tasks$ = new Observable<Task[]>([]);

  setTasks(tasks: Task[]) {
    const old = this.tasks$.get();

    const newIds = new Set(tasks.map((t) => t.id));

    // merge old and new tasks, preferring new tasks
    const unchanged = old.filter((t) => !newIds.has(t.id));

    const merged = [...unchanged, ...tasks];

    this.tasks$.set(merged.slice(0, this.options.maxTasks ?? 20));
  }

  getTasks() {
    return this.tasks$.get();
  }
}