import { test } from 'node:test';
import assert from 'node:assert/strict';
import { readFileSync } from 'node:fs';
import { runInNewContext } from 'node:vm';

function load() {
  let plugin;
  runInNewContext(readFileSync(new URL('./preview-download/client.js', import.meta.url), 'utf8'), {
    Uint8Array, window: { __ModuleLoader__: { load({ id, factory }) { assert.equal(id, 'dsh-preview-download'); plugin = factory(() => ({})); } } }
  });
  return plugin;
}
test('download passes exact session/path/signal to authorized complete-file RPC', async () => {
  const plugin = load();
  const data = new Uint8Array([0, 255, 10]);
  const signal = new AbortController().signal;
  const remote = { workspaceFiles: { async readBytes(...args) {
    assert.equal(args[0], 'session-A'); assert.equal(args[1], '/workspace/中文.pptx');
    assert.equal(Object.keys(args[2]).length, 0); assert.equal(args[3], signal);
    return { ok: true, value: { offset: 0, eof: true, bytes: 3, data } };
  } } };
  assert.equal(await plugin.readOriginal(remote, 'session-A', '/workspace/中文.pptx', signal), data);
  assert.equal(plugin.filename('/workspace/中文.pptx'), '中文.pptx');
  assert.equal(plugin.filename('C:' + String.fromCharCode(92) + 'folder' + String.fromCharCode(92) + 'file.docx'), 'file.docx');
});
test('denied, partial, size mismatch and cancelled reads never produce download data', async () => {
  const plugin = load();
  for (const result of [
    { ok: false, error: { code: 'gateway/forbidden' } },
    { ok: true, value: { offset: 0, eof: false, data: new Uint8Array() } },
    { ok: true, value: { offset: 0, eof: true, bytes: 5, data: new Uint8Array(2) } }
  ]) {
    await assert.rejects(plugin.readOriginal({ workspaceFiles: { readBytes: async () => result } }, 's', '/file', new AbortController().signal));
  }
  const controller = new AbortController(); controller.abort();
  await assert.rejects(plugin.readOriginal({ workspaceFiles: { readBytes: async () => ({ ok: true, value: {} }) } }, 's', '/file', controller.signal));
});
test('plugin registers only the supported preview action slot', () => {
  const plugin = load();
  let registration;
  plugin.apply({ effect: fn => fn(), locale: { register: () => () => {} }, remote: {}, slots: {
    inject(name, fn) { assert.equal(name, 'sidebar.right.tab.document.actions'); return fn(); },
    register(options, component) { registration = options; assert.equal(typeof component, 'function'); return () => {}; }
  } });
  assert.equal(registration.id, 'dsh-preview-download');
  assert.equal(typeof registration.inject('session-A').download, 'function');
});