import { assert } from '@open-wc/testing';

import { filenameFromResponse } from './filename.js';

describe('filenameFromResponse', () => {
  it('parses filename* with charset and percent-encoding from a Response', () => {
    const res = new Response(null, {
      headers: { 'content-disposition': "attachment; filename*=UTF-8''photo%20new.jpg" },
    });

    assert.equal(filenameFromResponse(res), 'photo new.jpg');
  });

  it('parses quoted filename from a Response', () => {
    const res = new Response(null, { headers: { 'content-disposition': 'attachment; filename="photo.jpg"' } });
    assert.equal(filenameFromResponse(res), 'photo.jpg');
  });

  it('parses unquoted filename from a Response', () => {
    const res = new Response(null, { headers: { 'content-disposition': 'attachment; filename=photo.jpg' } });
    assert.equal(filenameFromResponse(res), 'photo.jpg');
  });

  it('returns fallback when no filename present in Response', () => {
    const res = new Response(null, { headers: { 'content-disposition': 'attachment; foo=bar' } });
    assert.equal(filenameFromResponse(res), 'downloaded-file');
  });

  it('correctly decodes URI-encoded filenames with special characters', () => {
    const res = new Response(null, {
      headers: { 'content-disposition': "attachment; filename*=UTF-8''report%20final%20(v2).pdf" },
    });

    assert.equal(filenameFromResponse(res), 'report final (v2).pdf');
  });

  it('correctly decodes URI-encoded simple quoted filename', () => {
    const res = new Response(null, {
      headers: { 'content-disposition': 'attachment; filename="document%20(final).pdf"' },
    });

    assert.equal(filenameFromResponse(res), 'document (final).pdf');
  });

  it('correctly decodes URI-encoded simple unquoted filename', () => {
    const res = new Response(null, {
      headers: { 'content-disposition': 'attachment; filename=data%20file.csv' },
    });

    assert.equal(filenameFromResponse(res), 'data file.csv');
  });
});