import path from 'node:path';
import { beforeEach, describe, expect, it } from 'vitest';

import type { FileLoaderInterface } from '../../types';
import { TextLoader } from './index';

const fixturePath = (filename: string) => path.join(__dirname, `./fixtures/${filename}`);

let loader: FileLoaderInterface;

const testFile = fixturePath('test.txt');

beforeEach(() => {
  loader = new TextLoader();
});

describe('TextLoader', () => {
  it('should load pages correctly', async () => {
    const pages = await loader.loadPages(testFile);
    expect(pages).toHaveLength(1);
    const page = pages[0];
    expect(page).toMatchSnapshot();
  });

  it('should aggregate content correctly', async () => {
    const pages = await loader.loadPages(testFile);
    const content = await loader.aggregateContent(pages);
    // Default aggregation joins with newline
    expect(content).toBe('Hello Text.\nSecond Line.\n');
  });

  it('should handle file read errors in loadPages', async () => {
    const pages = await loader.loadPages(fixturePath('nonexistent.txt'));
    expect(pages).toHaveLength(1);
    expect(pages[0].metadata.error).toContain('Failed to load text file');
    expect(pages[0].pageContent).toBe('');
  });
});