import 'dart:io' as io;
import 'dart:ui' show Size;

import 'package:flutter_test/flutter_test.dart';
import 'package:ux/testing.dart';
import 'package:ux/ux.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  late FakeXVideoPlayerBackend fake;

  setUp(() {
    fake = FakeXVideoPlayerBackend(
      size: const Size(720, 1280),
      duration: const Duration(seconds: 30),
    );
    XVideoPlayerBackend.instance = fake;
  });

  tearDown(() {
    XVideoPlayerBackend.instance = MethodChannelXVideoPlayerBackend();
  });

  test('initialize creates the native instance, subscribes to events, '
      'and populates size + duration', () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);

    expect(ctrl.value.isInitialized, isFalse);
    expect(ctrl.value.size, Size.zero);

    await ctrl.initialize();

    expect(fake.createCalls.single, 'file:///tmp/fake.mp4');
    expect(fake.initializeCalls.single, 1);
    expect(ctrl.handle, 1);
    expect(ctrl.textureId, 101);
    expect(ctrl.value.isInitialized, isTrue);
    expect(ctrl.value.size, const Size(720, 1280));
    expect(ctrl.value.duration, const Duration(seconds: 30));
    expect(ctrl.value.aspectRatio, 720.0 / 1280.0);
  });

  test('play / pause flip isPlaying and forward to the backend', () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    await ctrl.play();
    expect(fake.playCalls.single, 1);
    expect(ctrl.value.isPlaying, isTrue);

    await ctrl.pause();
    expect(fake.pauseCalls.single, 1);
    expect(ctrl.value.isPlaying, isFalse);
  });

  test('seekTo clamps to [0, duration] and forwards the clamped value',
      () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    await ctrl.seekTo(const Duration(seconds: -5));
    expect(fake.seekToCalls.last.position, Duration.zero);
    expect(ctrl.value.position, Duration.zero);

    await ctrl.seekTo(const Duration(minutes: 99));
    expect(fake.seekToCalls.last.position, const Duration(seconds: 30));
    expect(ctrl.value.position, const Duration(seconds: 30));

    await ctrl.seekTo(const Duration(seconds: 10));
    expect(fake.seekToCalls.last.position, const Duration(seconds: 10));
  });

  test('setLooping / setVolume / setPlaybackSpeed clamp and forward',
      () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    await ctrl.setLooping(true);
    expect(fake.setLoopingCalls.single, (handle: 1, loop: true));
    expect(ctrl.value.isLooping, isTrue);

    await ctrl.setVolume(1.5);
    expect(fake.setVolumeCalls.single.volume, 1.0);
    expect(ctrl.value.volume, 1.0);

    await ctrl.setVolume(-1.0);
    expect(fake.setVolumeCalls.last.volume, 0.0);
    expect(ctrl.value.volume, 0.0);

    await ctrl.setPlaybackSpeed(0.0);
    expect(fake.setPlaybackSpeedCalls.last.rate, 0.25);
    expect(ctrl.value.playbackSpeed, 0.25);

    await ctrl.setPlaybackSpeed(10.0);
    expect(fake.setPlaybackSpeedCalls.last.rate, 4.0);
    expect(ctrl.value.playbackSpeed, 4.0);
  });

  test('stateChanged events flow into value (position, buffered, isPlaying)',
      () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    fake.emitState(
      1,
      isPlaying: true,
      position: const Duration(seconds: 5),
      buffered: [
        XDurationRange(Duration.zero, const Duration(seconds: 20)),
      ],
    );
    await Future<void>.delayed(Duration.zero);

    expect(ctrl.value.isPlaying, isTrue);
    expect(ctrl.value.position, const Duration(seconds: 5));
    expect(ctrl.value.buffered, hasLength(1));
    expect(ctrl.value.buffered.single.end, const Duration(seconds: 20));
  });

  test('sizeChanged events update value.size', () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    fake.emitSizeChanged(1, const Size(1280, 720));
    await Future<void>.delayed(Duration.zero);

    expect(ctrl.value.size, const Size(1280, 720));
    expect(ctrl.value.aspectRatio, 1280.0 / 720.0);
  });

  test('error events set hasError and stop further state mutations', () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    fake.emitError(1, 'decode_failed', 'codec init failure');
    await Future<void>.delayed(Duration.zero);

    expect(ctrl.value.hasError, isTrue);
    expect(ctrl.value.errorDescription, 'codec init failure');
  });

  test('completed event with looping=false flips isPlaying off; '
      'with looping=true it stays on (native loop is silent)', () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);
    await ctrl.initialize();

    await ctrl.play();
    expect(ctrl.value.isPlaying, isTrue);

    fake.emitCompleted(1);
    await Future<void>.delayed(Duration.zero);
    expect(ctrl.value.isPlaying, isFalse);

    await ctrl.play();
    await ctrl.setLooping(true);
    fake.emitCompleted(1);
    await Future<void>.delayed(Duration.zero);
    // Looping mode: completion is a no-op on the value; native handles
    // the rewind. value.isPlaying remains true.
    expect(ctrl.value.isPlaying, isTrue);
  });

  test('dispose is idempotent and prevents further operations', () async {
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    await ctrl.initialize();
    await ctrl.dispose();
    await ctrl.dispose(); // second dispose is a no-op
    expect(fake.disposeCalls, [1]);
    expect(
      () => ctrl.play(),
      throwsA(isA<XVideoPlayerException>()),
    );
  });

  test('initialize failure tears down the native instance so a retry '
      'is not blocked by a leaked claim', () async {
    fake.initializeError = const XVideoPlayerException('decode_failed');
    final ctrl = XVideoPlayerController.file(io.File('/tmp/fake.mp4'));
    addTearDown(ctrl.dispose);

    await expectLater(
      ctrl.initialize(),
      throwsA(isA<XVideoPlayerException>()),
    );

    // The controller has a handle from `create` even though `initialize`
    // threw; dispose must have been called to release it.
    expect(fake.disposeCalls.single, 1);
  });
}