part of '../chat_screen.dart';

class _DateSeparatorItem {
  final DateTime date;
  final GlobalKey key;
  _DateSeparatorItem(this.date, this.key);
}

class _MessageItem {
  final CachedMessage message;
  final int index;
  const _MessageItem(this.message, this.index);
}

class _UnreadSeparatorItem {
  const _UnreadSeparatorItem();
}

class _FrostedPanel extends StatelessWidget {
  final Color tint;
  final Border? border;
  final double sigma;
  final BackdropKey? backdropKey;
  final Widget child;

  const _FrostedPanel({
    required this.tint,
    this.border,
    this.sigma = AppFrost.panelSigma,
    this.backdropKey,
    required this.child,
  });

  @override
  Widget build(BuildContext context) {
    return Stack(
      fit: StackFit.passthrough,
      clipBehavior: Clip.none,
      children: [
        Positioned.fill(
          child: GlassSurface(
            frostTint: tint,
            frostSigma: sigma,
            border: border,
            backdropKey: backdropKey,
            child: const SizedBox.expand(),
          ),
        ),
        child,
      ],
    );
  }
}

class _MeasureSize extends StatefulWidget {
  final Widget child;
  final ValueChanged<double> onHeight;

  const _MeasureSize({required this.onHeight, required this.child});

  @override
  State<_MeasureSize> createState() => _MeasureSizeState();
}

class _MeasureSizeState extends State<_MeasureSize> {
  final GlobalKey _key = GlobalKey();
  double _last = -1;

  void _report() {
    if (!mounted) return;
    final height = _key.currentContext?.size?.height;
    if (height == null) return;
    if ((height - _last).abs() > 0.5) {
      _last = height;
      widget.onHeight(height);
    }
  }

  void _scheduleReport() {
    WidgetsBinding.instance.addPostFrameCallback((_) => _report());
  }

  @override
  Widget build(BuildContext context) {
    _scheduleReport();
    return NotificationListener<SizeChangedLayoutNotification>(
      onNotification: (_) {
        _scheduleReport();
        return true;
      },
      child: SizeChangedLayoutNotifier(
        child: SizedBox(key: _key, child: widget.child),
      ),
    );
  }
}

class ForwardRequest {
  final int sourceChatId;
  final String sourceChatName;
  final String sourceChatIconUrl;
  final String sourceChatType;
  final List<CachedMessage> messages;

  ForwardRequest({
    required this.sourceChatId,
    required this.sourceChatName,
    required this.sourceChatIconUrl,
    required this.sourceChatType,
    required List<CachedMessage> messages,
  }) : messages = List.unmodifiable(messages);

  ForwardRequest withMessages(List<CachedMessage> value) => ForwardRequest(
    sourceChatId: sourceChatId,
    sourceChatName: sourceChatName,
    sourceChatIconUrl: sourceChatIconUrl,
    sourceChatType: sourceChatType,
    messages: value,
  );
}

class ReplyRequest {
  final int sourceChatId;
  final CachedMessage message;

  const ReplyRequest({required this.sourceChatId, required this.message});
}