/**
 * Shared host-E2E helpers (native-surfaces migration, Task 2). NEW suites use
 * these; existing suites keep their own local copies (out of scope to
 * refactor them onto this shared file — see the Task 2 brief).
 */
import * as assert from "node:assert";
import * as vscode from "vscode";
import type { CowritingApi } from "../../../src/extension";

/** Activate the extension and return its exported API (asserts it is real). */
export async function activateApi(): Promise<CowritingApi> {
  const ext = vscode.extensions.getExtension("benstull.vscode-cowriting-plugin")!;
  const api = (await ext.activate()) as CowritingApi;
  assert.ok(api?.diffViewController, "extension exports diffViewController");
  return api;
}

/** A short fixed settle, for state that updates synchronously-ish after a command. */
export function settle(): Promise<void> {
  return new Promise((r) => setTimeout(r, 150));
}

/** Poll `predicate` every 100ms until it is true, or fail after `timeoutMs`. */
export async function settleUntil(predicate: () => boolean, timeoutMs = 5000): Promise<void> {
  const start = Date.now();
  while (!predicate()) {
    if (Date.now() - start > timeoutMs) {
      assert.fail(`settleUntil: predicate did not become true within ${timeoutMs}ms`);
    }
    await new Promise((r) => setTimeout(r, 100));
  }
}