import 'package:flutter/cupertino.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:provider/provider.dart';
import 'package:yumi/shared/tools/sc_cp_relation_pair_utils.dart';
import 'package:yumi/services/audio/rtc_manager.dart';
import 'package:yumi/ui_kit/widgets/room/seat/room_mic_relation_effect.dart';

import '../../../../modules/room/seat/sc_seat_item.dart';

class RoomSeatWidget extends StatefulWidget {
  const RoomSeatWidget({super.key});

  @override
  State<RoomSeatWidget> createState() => _RoomSeatWidgetState();
}

class _RoomSeatWidgetState extends State<RoomSeatWidget> {
  static const int _defaultVoiceRoomSeatCount = 10;
  static const int _seatColumnCount = 5;
  static const double _relationEffectWidth = 108;
  static const double _relationEffectHeight = 54;
  static const double _relationEffectTop = -2;

  int _lastSeatCount = 0;

  int _normalizeSeatCount(int? seatCount) {
    switch (seatCount) {
      case 5:
      case 10:
      case 15:
      case 20:
        return seatCount ?? 0;
      default:
        return 0;
    }
  }

  int _resolvedSeatCount(_RoomSeatLayoutSnapshot snapshot) {
    final int liveSeatCount = _normalizeSeatCount(snapshot.seatCount);
    final int configuredSeatCount = _normalizeSeatCount(
      snapshot.configuredSeatCount,
    );
    final int seatCount =
        configuredSeatCount > 0 ? configuredSeatCount : liveSeatCount;
    if (!snapshot.isExitingCurrentVoiceRoomSession && seatCount > 0) {
      _lastSeatCount = seatCount;
    }
    if (snapshot.isExitingCurrentVoiceRoomSession && _lastSeatCount > 0) {
      return _lastSeatCount;
    }
    if (snapshot.hasCurrentRoom && seatCount == 0) {
      return _lastSeatCount > 0 ? _lastSeatCount : _defaultVoiceRoomSeatCount;
    }
    return seatCount;
  }

  int _seatCountFromMicIndexes(Iterable<num> micIndexes) {
    var maxIndex = -1;
    var count = 0;
    for (final micIndex in micIndexes) {
      count += 1;
      final resolvedIndex = micIndex.toInt();
      if (resolvedIndex > maxIndex) {
        maxIndex = resolvedIndex;
      }
    }
    final indexedSeatCount = _normalizeSeatCount(maxIndex + 1);
    if (indexedSeatCount > 0) {
      return indexedSeatCount;
    }
    return _normalizeSeatCount(count);
  }

  int _seatContentVersion(RtcProvider provider) {
    var version = provider.roomWheatMap.length;
    final micIndexes =
        provider.roomWheatMap.keys.toList()..sort((a, b) => a.compareTo(b));
    for (final micIndex in micIndexes) {
      final seat = provider.micAtIndexForDisplay(micIndex);
      final user = seat?.user;
      version = Object.hash(
        version,
        micIndex,
        seat?.micLock ?? false,
        seat?.micMute ?? false,
        user?.id ?? "",
        user?.userAvatar ?? "",
        user?.userNickname ?? "",
        user?.roles ?? "",
        user?.getHeaddress()?.sourceUrl ?? "",
        user?.getHeaddress()?.cover ?? "",
        user?.getVIP()?.name ?? "",
        scCpProfileRelationVersion(user),
      );
    }
    return version;
  }

  @override
  Widget build(BuildContext context) {
    return Selector<RtcProvider, _RoomSeatLayoutSnapshot>(
      selector:
          (context, provider) => _RoomSeatLayoutSnapshot(
            seatCount: _seatCountFromMicIndexes(provider.roomWheatMap.keys),
            seatContentVersion: _seatContentVersion(provider),
            showRoomVisualEffects: provider.shouldShowRoomVisualEffects,
            configuredSeatCount:
                provider.currenRoom?.roomProfile?.roomSetting?.mikeSize
                    ?.toInt() ??
                provider.previewRoomSeatCount ??
                0,
            hasCurrentRoom: provider.currenRoom != null,
            isExitingCurrentVoiceRoomSession:
                provider.isExitingCurrentVoiceRoomSession,
          ),
      builder: (context, snapshot, child) {
        final int seatCount = _resolvedSeatCount(snapshot);
        return seatCount == 5
            ? _buildSeat5()
            : (seatCount == 10
                ? _buildSeat10()
                : (seatCount == 15
                    ? _buildSeat15()
                    : (seatCount == 20
                        ? _buildSeat20()
                        : Container(height: 180.w))));
      },
    );
  }

  _buildSeat5() {
    return Container(
      margin: EdgeInsets.only(top: 3.w, left: 10.w, right: 10.w),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          _buildSeatRow(const [0, 1, 2, 3, 4]),
        ],
      ),
    );
  }

  _buildSeat10() {
    return Container(
      margin: EdgeInsets.only(top: 3.w, left: 10.w, right: 10.w),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          _buildSeatRow(const [0, 1, 2, 3, 4]),
          _buildSeatRow(const [5, 6, 7, 8, 9]),
        ],
      ),
    );
  }

  _buildSeat15() {
    return Container(
      margin: EdgeInsets.only(top: 3.w, left: 10.w, right: 10.w),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          _buildSeatRow(const [0, 1, 2, 3, 4]),
          _buildSeatRow(const [5, 6, 7, 8, 9]),
          _buildSeatRow(const [10, 11, 12, 13, 14]),
        ],
      ),
    );
  }

  _buildSeat20() {
    return Container(
      margin: EdgeInsets.only(top: 3.w, left: 10.w, right: 10.w),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          _buildSeatRow(const [0, 1, 2, 3, 4]),
          _buildSeatRow(const [5, 6, 7, 8, 9]),
          _buildSeatRow(const [10, 11, 12, 13, 14]),
          _buildSeatRow(const [15, 16, 17, 18, 19]),
        ],
      ),
    );
  }

  Widget _buildSeatRow(List<int> indexes) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final rowWidth = constraints.maxWidth;
        final columnWidth = rowWidth / _seatColumnCount;
        return Stack(
          clipBehavior: Clip.none,
          children: [
            Row(
              children: [
                for (final index in indexes)
                  Expanded(flex: 1, child: SCSeatItem(index: index)),
              ],
            ),
            if (rowWidth.isFinite)
              ..._buildRelationEffectsForRow(
                context,
                indexes: indexes,
                columnWidth: columnWidth,
              ),
          ],
        );
      },
    );
  }

  List<Widget> _buildRelationEffectsForRow(
    BuildContext context, {
    required List<int> indexes,
    required double columnWidth,
  }) {
    final provider = context.read<RtcProvider>();
    if (!provider.shouldShowRoomVisualEffects) {
      return const <Widget>[];
    }
    final effects = <Widget>[];
    for (var slot = 0; slot < indexes.length - 1; slot += 1) {
      final relationInfo = _relationInfoBetweenSeats(
        provider,
        indexes[slot],
        indexes[slot + 1],
      );
      if (relationInfo == null) {
        continue;
      }
      final left = ((slot + 1) * columnWidth - (_relationEffectWidth.w / 2))
          .clamp(0.0, double.infinity);
      effects.add(
        Positioned(
          left: left,
          top: _relationEffectTop.w,
          width: _relationEffectWidth.w,
          height: _relationEffectHeight.w,
          child: IgnorePointer(
            child: RoomMicRelationEffect(
              relationType: relationInfo.relationType,
              cpLevel: relationInfo.cpLevel,
            ),
          ),
        ),
      );
    }
    return effects;
  }

  SCCpRelationPairInfo? _relationInfoBetweenSeats(
    RtcProvider provider,
    int leftIndex,
    int rightIndex,
  ) {
    final leftUser = provider.micAtIndexForDisplay(leftIndex)?.user;
    final rightUser = provider.micAtIndexForDisplay(rightIndex)?.user;
    return scCpRelationInfoBetweenProfiles(leftUser, rightUser);
  }
}

class _RoomSeatLayoutSnapshot {
  const _RoomSeatLayoutSnapshot({
    required this.seatCount,
    required this.seatContentVersion,
    required this.showRoomVisualEffects,
    required this.configuredSeatCount,
    required this.hasCurrentRoom,
    required this.isExitingCurrentVoiceRoomSession,
  });

  final int seatCount;
  final int seatContentVersion;
  final bool showRoomVisualEffects;
  final int configuredSeatCount;
  final bool hasCurrentRoom;
  final bool isExitingCurrentVoiceRoomSession;

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    return other is _RoomSeatLayoutSnapshot &&
        other.seatCount == seatCount &&
        other.seatContentVersion == seatContentVersion &&
        other.showRoomVisualEffects == showRoomVisualEffects &&
        other.configuredSeatCount == configuredSeatCount &&
        other.hasCurrentRoom == hasCurrentRoom &&
        other.isExitingCurrentVoiceRoomSession ==
            isExitingCurrentVoiceRoomSession;
  }

  @override
  int get hashCode => Object.hash(
    seatCount,
    seatContentVersion,
    showRoomVisualEffects,
    configuredSeatCount,
    hasCurrentRoom,
    isExitingCurrentVoiceRoomSession,
  );
}