import { logger } from '../utils/logger.js';
import fs from 'fs-extra';
import path from 'path';

const TASKS_FILE = 'data/tasks.json';

export class TaskUpdateTool {
  constructor() {
    this.name = 'task_update';
    this.description = 'Update task status (pending/in_progress/completed/cancelled)';
  }

  async execute(args) {
    const { task_id, status } = args;
    const validStatuses = ['pending', 'in_progress', 'completed', 'cancelled'];
    if (!validStatuses.includes(status)) {
      return `❌ Invalid status. Use: ${validStatuses.join(', ')}`;
    }

    try {
      const tasks = await this._loadTasks();
      const task = tasks.find(t => t.id === task_id);
      if (!task) return `❌ Task not found: #${task_id}`;

      task.status = status;
      task.updated = new Date().toISOString();
      await this._saveTasks(tasks);
      return `✅ Task #${task_id} → ${status}`;
    } catch (e) {
      return `❌ ${e.message}`;
    }
  }

  async _loadTasks() {
    try { return await fs.readJson(TASKS_FILE); } catch { return []; }
  }

  async _saveTasks(tasks) {
    await fs.ensureDir(path.dirname(TASKS_FILE));
    await fs.writeJson(TASKS_FILE, tasks, { spaces: 2 });
  }
}