import 'dart:async';

import 'package:flutter/widgets.dart';

import 'dart:convert';

import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';

class FakeSchoolPlatform extends WebViewPlatform {
  @override
  PlatformWebViewWidget createPlatformWebViewWidget(
    PlatformWebViewWidgetCreationParams params,
  ) => FakeSchoolWidget(params);
  int controllerCreations = 0;
  late FakeSchoolWeb web;
  late FakeSchoolDelegate delegate;
  final cookies = FakeSchoolCookies();
  @override
  PlatformWebViewController createPlatformWebViewController(
    PlatformWebViewControllerCreationParams params,
  ) {
    controllerCreations++;
    return web = FakeSchoolWeb(params);
  }

  @override
  PlatformNavigationDelegate createPlatformNavigationDelegate(
    PlatformNavigationDelegateCreationParams params,
  ) => delegate = FakeSchoolDelegate(params);
  @override
  PlatformWebViewCookieManager createPlatformCookieManager(
    PlatformWebViewCookieManagerCreationParams params,
  ) => cookies;
}

class FakeSchoolWidget extends PlatformWebViewWidget {
  FakeSchoolWidget(super.params) : super.implementation();
  @override
  Widget build(BuildContext context) =>
      const SizedBox.expand(key: Key('fake-school-browser'));
}

class FakeSchoolWeb extends PlatformWebViewController {
  FakeSchoolWeb(super.params) : super.implementation();
  final loads = <String>[];
  String? url;
  String? documentUrl;
  Future<Object> Function(String)? javascript;
  Future<void> Function(Uri)? request;
  Future<String?> Function()? readCurrentUrl;
  @override
  Future<void> setJavaScriptMode(JavaScriptMode mode) async {}
  @override
  Future<void> setPlatformNavigationDelegate(
    PlatformNavigationDelegate handler,
  ) async {}
  @override
  Future<void> loadRequest(LoadRequestParams params) async {
    url = params.uri.toString();
    loads.add(url!);
    await request?.call(params.uri);
  }

  @override
  Future<String?> currentUrl() => readCurrentUrl?.call() ?? Future.value(url);
  @override
  Future<Object> runJavaScriptReturningResult(String script) =>
      script == 'location.href'
      ? Future.value(documentUrl ?? url ?? 'about:blank')
      : javascript?.call(script) ?? Future.value(false);
  @override
  Future<void> clearCache() async {}
  @override
  Future<void> clearLocalStorage() async {}
  @override
  Future<void> loadHtmlString(String html, {String? baseUrl}) async {
    url = 'about:blank';
    loads.add('about:blank');
  }
}

class FakeSchoolDelegate extends PlatformNavigationDelegate {
  FakeSchoolDelegate(super.params) : super.implementation();
  late PageEventCallback started, finished;
  late WebResourceErrorCallback resourceError;
  late NavigationRequestCallback navigation;
  @override
  Future<void> setOnNavigationRequest(
    NavigationRequestCallback callback,
  ) async {
    navigation = callback;
  }

  @override
  Future<void> setOnPageStarted(PageEventCallback callback) async {
    started = callback;
  }

  @override
  Future<void> setOnPageFinished(PageEventCallback callback) async {
    finished = callback;
  }

  @override
  Future<void> setOnWebResourceError(WebResourceErrorCallback callback) async {
    resourceError = callback;
  }

  @override
  Future<void> setOnHttpError(HttpResponseErrorCallback callback) async {}
}

class FakeSchoolCookies extends PlatformWebViewCookieManager {
  FakeSchoolCookies()
    : super.implementation(const PlatformWebViewCookieManagerCreationParams());
  Completer<bool>? clearing;
  bool fail = false;
  @override
  Future<bool> clearCookies() => fail
      ? Future.error(StateError('native cookies'))
      : clearing?.future ?? Future.value(true);
}

Future<void> flushSchoolEvents() async {
  for (var i = 0; i < 12; i++) {
    await Future<void>.delayed(Duration.zero);
  }
}

String schoolPageEvidence({
  required String topUrl,
  bool authenticated = false,
  String? html,
  String? documentUrl,
  String kind = 'timetable',
}) => jsonEncode({
  'topUrl': topUrl,
  'authenticated': authenticated,
  'pages': [
    if (html != null)
      {'kind': kind, 'url': documentUrl ?? topUrl, 'html': html},
  ],
});