import 'package:fintracker_api/fintracker_api.dart';
import 'package:fintracker_app/features/home/providers.dart';
import 'package:flutter_test/flutter_test.dart';

MetricsStatusOut _status({required bool refreshing, bool consistent = true}) =>
    MetricsStatusOut(
      lastRefresh: null,
      consistent: consistent,
      refreshing: refreshing,
    );

void main() {
  const fast = Duration(milliseconds: 1);

  test('polls until the server stops reporting a rebuild', () async {
    final answers = [
      _status(refreshing: true),
      _status(refreshing: true),
      _status(refreshing: false),
    ];
    var calls = 0;

    final done = await waitForMetricsRefresh(
      () async => answers[calls++],
      interval: fast,
    );

    expect(calls, 3);
    expect(done?.refreshing, isFalse);
  });

  test('returns straight away when nothing is queued', () async {
    var calls = 0;
    final done = await waitForMetricsRefresh(() async {
      calls++;
      return _status(refreshing: false);
    }, interval: fast);

    expect(calls, 1);
    expect(done, isNotNull);
  });

  test('a failed rebuild is handed back so the caller can say so', () async {
    final done = await waitForMetricsRefresh(
      () async => _status(refreshing: false, consistent: false),
      interval: fast,
    );

    expect(done?.consistent, isFalse);
  });

  test('gives up with null when the rebuild never finishes', () async {
    final done = await waitForMetricsRefresh(
      () async => _status(refreshing: true),
      interval: fast,
      timeout: const Duration(milliseconds: 20),
    );

    expect(done, isNull);
  });
}