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import { z } from "zod";
import type { TaskItem, TaskStatus, ToolDefinition } from "../types/index.js";
export class TaskList {
private tasks: TaskItem[] = [];
private counter = 0;
private listeners: Array<(tasks: TaskItem[]) => void> = [];
private notify(): void {
const snapshot = this.getTasks();
for (const listener of this.listeners) {
listener(snapshot);
}
}
getTasks(): TaskItem[] {
return [...this.tasks];
}
getTask(id: string): TaskItem | undefined {
return this.tasks.find((t) => t.id === id);
}
addTask(title: string, description: string): TaskItem {
this.counter++;
const task: TaskItem = {
id: `task-${this.counter}`,
title,
description,
status: "pending",
};
this.tasks.push(task);
this.notify();
return task;
}
updateTask(id: string, status: TaskStatus): TaskItem | undefined {
const task = this.tasks.find((t) => t.id === id);
if (!task) return undefined;
task.status = status;
this.notify();
return { ...task };
}
removeTask(id: string): boolean {
const index = this.tasks.findIndex((t) => t.id === id);
if (index === -1) return false;
this.tasks.splice(index, 1);
this.notify();
return true;
}
onChange(callback: (tasks: TaskItem[]) => void): () => void {
this.listeners.push(callback);
return () => {
this.listeners = this.listeners.filter((l) => l !== callback);
};
}
}
export function createTaskListTool(taskList: TaskList): ToolDefinition {
return {
name: "todo",
description:
"Manage a todo list for planning and tracking work. Add items, update their status, list all items, or get details on a specific item.",
parameters: z.object({
action: z.enum(["add", "update", "list", "get", "remove"]).describe("The action to perform"),
title: z.string().optional().describe("Task title (required for 'add')"),
description: z
.string()
.optional()
.describe("Task description (for 'add', defaults to empty)"),
task_id: z.string().optional().describe("Task ID (required for 'update', 'get', 'remove')"),
status: z
.enum(["pending", "in_progress", "done"])
.optional()
.describe("New status (required for 'update')"),
}),
execute: async (args: Record<string, unknown>): Promise<string> => {
const action = args.action as string;
if (action === "add") {
const title = args.title as string | undefined;
if (!title) {
return "Error: 'title' is required for the 'add' action.";
}
const description = (args.description as string | undefined) ?? "";
const task = taskList.addTask(title, description);
return JSON.stringify(task);
}
if (action === "update") {
const task_id = args.task_id as string | undefined;
const status = args.status as TaskStatus | undefined;
if (!task_id) {
return "Error: 'task_id' is required for the 'update' action.";
}
if (!status) {
return "Error: 'status' is required for the 'update' action.";
}
const updated = taskList.updateTask(task_id, status);
if (!updated) {
return `Error: Task with ID '${task_id}' not found.`;
}
return JSON.stringify(updated);
}
if (action === "get") {
const task_id = args.task_id as string | undefined;
if (!task_id) {
return "Error: 'task_id' is required for the 'get' action.";
}
const task = taskList.getTask(task_id);
if (!task) {
return `Error: Task with ID '${task_id}' not found.`;
}
return JSON.stringify(task);
}
if (action === "list") {
const tasks = taskList.getTasks();
if (tasks.length === 0) {
return "No tasks.";
}
return JSON.stringify(tasks);
}
if (action === "remove") {
const task_id = args.task_id as string | undefined;
if (!task_id) {
return "Error: 'task_id' is required for the 'remove' action.";
}
const removed = taskList.removeTask(task_id);
if (!removed) {
return `Error: Task with ID '${task_id}' not found.`;
}
return `Task '${task_id}' removed successfully.`;
}
return `Error: Unknown action '${action}'.`;
},
};
}
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