import 'dart:io';
import 'dart:convert';
import 'dart:async';

import 'package:flutter_test/flutter_test.dart';
import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
import 'package:hepan_everyday/features/school/undergraduate/session.dart';
import 'package:hepan_everyday/features/school/undergraduate/page_probe.dart';

import '../support/fake_school_web.dart';

String underEvidence(
  String url, {
  bool authenticated = true,
  String? html,
  String kind = 'timetable',
}) => jsonEncode({
  'topUrl': url,
  'authenticated': authenticated,
  'pages': [
    if (html != null) {'kind': kind, 'url': url, 'html': html},
  ],
});
void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  late FakeSchoolPlatform platform;
  late UndergraduateSession session;
  setUp(() {
    platform = FakeSchoolPlatform();
    WebViewPlatform.instance = platform;
    session = UndergraduateSession();
  });
  tearDown(() => session.dispose());
  test(
    'page-finished during an old probe is retried on the redirected portal',
    () async {
      await session.openTimetable();
      var first = true;
      platform.web.javascript = (_) async {
        if (first) {
          first = false;
          platform.web.url = 'https://eams.uestc.edu.cn/eams/home.action';
          platform.delegate.finished(platform.web.url!);
        }
        return underEvidence(platform.web.url!);
      };
      platform.delegate.finished(platform.web.url!);
      await flushSchoolEvents();
      await Future<void>.delayed(const Duration(milliseconds: 600));
      await flushSchoolEvents();
      expect(session.statusLabel, '已连接');
      expect(session.busy, isFalse);
    },
  );
  test('a redirect between page callback and probe does not permanently stop login detection', () async {
    await session.openTimetable();
    var redirect = true;
    platform.web.javascript = (_) async {
      if (redirect) {
        redirect = false;
        platform.web.url = 'https://idas.uestc.edu.cn/authserver/login';
        return underEvidence(platform.web.url!, authenticated: false);
      }
      return underEvidence(platform.web.url!);
    };
    platform.delegate.finished(platform.web.url!);
    await flushSchoolEvents();
    expect(session.message, isNot(contains('未完成')));
    platform.delegate.finished(platform.web.url!);
    await flushSchoolEvents();
    platform.web.url = 'https://eams.uestc.edu.cn/eams/';
    platform.delegate.finished(platform.web.url!);
    await flushSchoolEvents();
    expect(session.statusLabel, '已连接');
  });
  test(
    'activating a loading browser never probes the previous blank document',
    () async {
      await session.openTimetable();
      var probes = 0;
      platform.web.javascript = (_) async {
        probes++;
        return underEvidence('about:blank', authenticated: false);
      };
      session.setReadingActive(true);
      await flushSchoolEvents();
      expect(probes, 0);
      platform.web.javascript = (_) async => underEvidence(platform.web.url!);
      platform.delegate.started(platform.web.url!);
      platform.delegate.finished(platform.web.url!);
      await flushSchoolEvents();
      expect(session.busy, isFalse);
      expect(session.message, UndergraduateSession.manualMessage);
    },
  );
  test(
    'manual session is lazy and never captures until the student taps import',
    () async {
      expect(platform.controllerCreations, 0);
      await session.openTimetable();
      expect(platform.web.loads, ['https://eams.uestc.edu.cn/eams/']);
      final content = File('test/fixtures/school/undergraduate-timetable.html')
          .readAsStringSync();
      var captures = 0;
      platform.web.javascript = (s) async {
        if (s == undergraduateCaptureScript) {
          captures++;
          return underEvidence(platform.web.url!, html: content);
        }
        return underEvidence(platform.web.url!);
      };
      platform.delegate.finished(platform.web.url!);
      await flushSchoolEvents();
      expect(captures, 0);
      expect(session.pendingDraft, isNull);
      await session.readCurrentTimetable();
      expect(captures, 1);
      expect(session.pendingDraft!.courses, hasLength(18));
    },
  );
  test('closed routes reject old asynchronous capture and save', () async {
    await session.openTimetable();
    final gate = Completer<Object>();
    platform.web.javascript = (_) => gate.future;
    final read = session.readCurrentTimetable();
    await flushSchoolEvents();
    final generation = session.pageGeneration;
    session.setReadingActive(false);
    gate.complete(
      underEvidence(
        platform.web.url!,
        html: File('test/fixtures/school/undergraduate-timetable.html')
            .readAsStringSync(),
      ),
    );
    await read;
    expect(session.pendingDraft, isNull);
    expect(session.saved(generation: generation), isFalse);
  });
  test(
    'unused logout stays lazy and failed cookie clearing can be retried',
    () async {
      await session.logout();
      expect(platform.controllerCreations, 0);
      await session.openTimetable();
      platform.cookies.fail = true;
      await session.logout();
      expect(session.canLogout, isTrue);
      platform.cookies.fail = false;
      await session.logout();
      expect(session.canLogout, isFalse);
    },
  );
  test('new login waits for an outstanding cookie clear', () async {
    await session.openTimetable();
    platform.cookies.clearing = Completer<bool>();
    final closing = session.logout();
    await flushSchoolEvents();
    final reopening = session.openTimetable();
    await flushSchoolEvents();
    platform.cookies.clearing!.complete(true);
    await closing;
    await reopening;
    expect(session.hasOpened, isTrue);
    expect(platform.web.loads.last, 'https://eams.uestc.edu.cn/eams/');
  });
}