import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { mkdtempSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';
import { appendTaskLog, readTaskLog } from '../src/core/services/taskLogService.js';

describe('taskLogService', () => {
  let cwd: string;

  beforeEach(() => {
    cwd = mkdtempSync(join(tmpdir(), 'ah-log-'));
  });
  afterEach(() => {
    rmSync(cwd, { recursive: true, force: true });
  });

  it('returns an empty log for a task with no output yet', () => {
    expect(readTaskLog(cwd, 'TSK-0001')).toEqual([]);
  });

  it('appends lines and reads them back in order', () => {
    appendTaskLog(cwd, 'TSK-0001', { text: 'cloning repo', agent: 'backyard' });
    appendTaskLog(cwd, 'TSK-0001', { text: 'running build', agent: 'backyard', level: 'info' });
    const log = readTaskLog(cwd, 'TSK-0001');
    expect(log).toHaveLength(2);
    expect(log[0].text).toBe('cloning repo');
    expect(log[0].agent).toBe('backyard');
    expect(log[1].text).toBe('running build');
    expect(log[0].ts).toBeTruthy();
  });

  it('keeps each task log isolated', () => {
    appendTaskLog(cwd, 'TSK-0001', { text: 'a' });
    appendTaskLog(cwd, 'TSK-0002', { text: 'b' });
    expect(readTaskLog(cwd, 'TSK-0001')).toHaveLength(1);
    expect(readTaskLog(cwd, 'TSK-0002')[0].text).toBe('b');
  });

  it('rejects empty log text', () => {
    expect(() => appendTaskLog(cwd, 'TSK-0001', { text: '   ' })).toThrow();
  });
});