import 'dart:async';
import 'dart:collection';

import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
import 'package:yumi/shared/data_sources/sources/local/floating_screen_manager.dart';

class SCRoomTopLayerGuard {
  static const int _maxDeferredActions = 16;
  static const String _redPacketOpenDialogTag = 'showRoomRedPacketOpenDialog';
  static const String _roomRocketRewardDialogTag = 'showRoomRocketRewardDialog';
  static const String _roomRocketPagLaunchDialogTag =
      'showRoomRocketPagLaunchDialog';

  static final SCRoomTopLayerGuard _instance = SCRoomTopLayerGuard._internal();

  factory SCRoomTopLayerGuard() => _instance;

  SCRoomTopLayerGuard._internal();

  final Queue<VoidCallback> _deferredActions = Queue<VoidCallback>();
  final ValueNotifier<bool> _activeListenable = ValueNotifier<bool>(false);
  int _activeCount = 0;

  bool get isActive => _activeCount > 0;

  ValueListenable<bool> get activeListenable => _activeListenable;

  SCRoomTopLayerGuardLease acquire({
    required String reason,
    Set<String> keepDialogTags = const <String>{},
  }) {
    _begin(reason, keepDialogTags: keepDialogTags);
    return SCRoomTopLayerGuardLease._(this, reason);
  }

  void runWhenInactive(VoidCallback action) {
    if (!isActive) {
      action();
      return;
    }
    while (_deferredActions.length >= _maxDeferredActions) {
      _deferredActions.removeFirst();
    }
    _deferredActions.add(action);
  }

  void _begin(String reason, {Set<String> keepDialogTags = const <String>{}}) {
    _activeCount += 1;
    if (_activeCount != 1) {
      return;
    }
    _activeListenable.value = true;
    OverlayManager().beginSuppressFloatingScreens(reason: reason);
    if (!keepDialogTags.contains(_redPacketOpenDialogTag)) {
      unawaited(SmartDialog.dismiss(tag: _redPacketOpenDialogTag));
    }
    if (!keepDialogTags.contains(_roomRocketRewardDialogTag)) {
      unawaited(SmartDialog.dismiss(tag: _roomRocketRewardDialogTag));
    }
    if (!keepDialogTags.contains(_roomRocketPagLaunchDialogTag)) {
      unawaited(SmartDialog.dismiss(tag: _roomRocketPagLaunchDialogTag));
    }
  }

  void _release(String reason) {
    if (_activeCount <= 0) {
      return;
    }
    _activeCount -= 1;
    if (_activeCount != 0) {
      return;
    }
    OverlayManager().endSuppressFloatingScreens(reason: reason);
    _activeListenable.value = false;
    _drainDeferredActions();
  }

  void _drainDeferredActions() {
    if (_deferredActions.isEmpty) {
      return;
    }
    final actions = List<VoidCallback>.from(_deferredActions);
    _deferredActions.clear();
    scheduleMicrotask(() {
      for (final action in actions) {
        if (isActive) {
          runWhenInactive(action);
          continue;
        }
        action();
      }
    });
  }
}

class SCRoomTopLayerSuppressor extends StatefulWidget {
  const SCRoomTopLayerSuppressor({
    super.key,
    required this.reason,
    required this.child,
    this.keepDialogTags = const <String>{},
  });

  final String reason;
  final Widget child;
  final Set<String> keepDialogTags;

  @override
  State<SCRoomTopLayerSuppressor> createState() =>
      _SCRoomTopLayerSuppressorState();
}

class _SCRoomTopLayerSuppressorState extends State<SCRoomTopLayerSuppressor> {
  SCRoomTopLayerGuardLease? _lease;

  @override
  void initState() {
    super.initState();
    _acquire();
  }

  @override
  void didUpdateWidget(covariant SCRoomTopLayerSuppressor oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.reason == widget.reason &&
        setEquals(oldWidget.keepDialogTags, widget.keepDialogTags)) {
      return;
    }
    _release();
    _acquire();
  }

  @override
  void dispose() {
    _release();
    super.dispose();
  }

  void _acquire() {
    _lease = SCRoomTopLayerGuard().acquire(
      reason: widget.reason,
      keepDialogTags: widget.keepDialogTags,
    );
  }

  void _release() {
    _lease?.release();
    _lease = null;
  }

  @override
  Widget build(BuildContext context) {
    return widget.child;
  }
}

class SCRoomTopLayerGuardLease {
  SCRoomTopLayerGuardLease._(this._guard, this.reason);

  final SCRoomTopLayerGuard _guard;
  final String reason;
  bool _released = false;

  void release() {
    if (_released) {
      return;
    }
    _released = true;
    _guard._release(reason);
  }
}