import 'dart:io';

import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_app/halkyon_app.dart';
import 'package:halkyon_app/testing.dart';
import 'package:path/path.dart' as p;

void main() {
  late FakeNetworkWatch network;
  late MobileDataGate gate;

  setUp(() {
    network = FakeNetworkWatch();
    gate = MobileDataGate(network: network, offered: true);
    addTearDown(gate.dispose);
  });

  test('on Wi-Fi everything goes, whatever is set', () async {
    await gate.ready;
    for (final setting in MobileData.values) {
      await gate.choose(setting);
      expect(gate.metered, isFalse);
      expect(gate.allowance, SyncAllowance.everything);
      expect(gate.filesAllowed, isTrue);
    }
  });

  test('on mobile data, asking holds back everything until answered', () async {
    network.state = FakeNetworkWatch.mobile;
    await gate.ready;

    expect(gate.metered, isTrue);
    expect(gate.allowance, SyncAllowance.nothing);
    expect(gate.filesAllowed, isFalse);

    gate.answer(SyncAllowance.rows);
    expect(gate.allowance, SyncAllowance.rows, reason: 'without files');
    expect(gate.filesAllowed, isFalse);

    gate.answer(SyncAllowance.everything);
    expect(gate.filesAllowed, isTrue);
  });

  test("set to Without files or Everything, mobile data doesn't ask", () async {
    network.state = FakeNetworkWatch.mobile;
    await gate.ready;

    await gate.choose(MobileData.withoutFiles);
    expect(gate.allowance, SyncAllowance.rows);
    await gate.choose(MobileData.everything);
    expect(gate.allowance, SyncAllowance.everything);
  });

  test('an answer holds until the connection changes: Wi-Fi come and gone, '
      'or another metered network, asks again', () async {
    network.state = FakeNetworkWatch.mobile;
    await gate.ready;
    var changes = 0;
    gate
      ..addListener(() => changes++)
      ..answer(SyncAllowance.everything);
    expect(changes, 1);

    network.moveTo(FakeNetworkWatch.mobile);
    expect(changes, 1, reason: 'the same network again changes nothing');
    expect(gate.allowance, SyncAllowance.everything);

    network
      ..moveTo(FakeNetworkWatch.wifi)
      ..moveTo(FakeNetworkWatch.mobile);
    expect(gate.allowance, SyncAllowance.nothing);

    gate.answer(SyncAllowance.everything);
    network.moveTo((id: 'hotspot', metered: true));
    expect(gate.allowance, SyncAllowance.nothing);
  });

  test('nothing is answered off a metered network', () async {
    await gate.ready;
    gate.answer(SyncAllowance.everything);
    network.moveTo(FakeNetworkWatch.mobile);
    expect(gate.allowance, SyncAllowance.nothing);
  });

  test('a desktop is never metered, and is offered no choice', () async {
    final desktop = MobileDataGate();
    addTearDown(desktop.dispose);
    await desktop.ready;
    expect(desktop.offered, isFalse);
    expect(desktop.allowance, SyncAllowance.everything);
  });

  group('kept on the device', () {
    late Directory folder;

    setUp(() async {
      folder = await Directory.systemTemp.createTemp('mobile_data');
      addTearDown(() => folder.delete(recursive: true));
    });

    test('the setting stays when the app opens again; an answer goes with '
        'the app', () async {
      final file = File(p.join(folder.path, 'mobile_data.json'));
      network.state = FakeNetworkWatch.mobile;
      final first = await MobileDataGate.open(
        file,
        network: network,
        offered: true,
      );
      addTearDown(first.dispose);
      await first.ready;
      await first.choose(MobileData.withoutFiles);

      final again = await MobileDataGate.open(
        file,
        network: network,
        offered: true,
      );
      addTearDown(again.dispose);
      await again.ready;
      expect(again.mobileData, MobileData.withoutFiles);

      await again.choose(MobileData.ask);
      again.answer(SyncAllowance.everything);
      final third = await MobileDataGate.open(
        file,
        network: network,
        offered: true,
      );
      addTearDown(third.dispose);
      await third.ready;
      expect(third.allowance, SyncAllowance.nothing);
    });

    test('a file that is no setting asks', () async {
      final file = File(p.join(folder.path, 'mobile_data.json'));
      for (final content in ['not json', '[1]', '{"mobileData": "never"}']) {
        await file.writeAsString(content);
        final gate = await MobileDataGate.open(
          file,
          network: network,
          offered: true,
        );
        addTearDown(gate.dispose);
        expect(gate.mobileData, MobileData.ask, reason: content);
      }
    });
  });
}