part of '../message_group.dart';

// Sprechblasen-Darstellung (Einstellung „Nachrichten: Sprechblasen“, auf dem
// Handy Standard – Bernds Entscheidung 2026-10-07). Eigene Nachrichten rechts
// in Akzentfarbe, andere links; in Gruppenräumen mit Name + Avatar, in
// Direktnachrichten ohne. Bilder/Videos ohne Blase, dafür in voller Größe.
// Inhalt (Text, Antwort-Zitat, Medien), Reaktionen, Auswahl, Hover-Aktionen
// und Wischen-zum-Antworten kommen aus denselben Bausteinen wie die Liste.

const _kBubbleMaxWidthFactor = 0.82;
const _kBubbleAvatarSize = 30.0;
const _kBubbleAvatarGap = 8.0;

extension _BubbleBuilder on _MessageGroupState {
  Widget _buildBubbles(BuildContext context, PyramidTheme pt) {
    final firstEvent = widget.events.first;
    final isOwn = firstEvent.senderId == widget.currentUserId;
    final isDm = widget.room?.isDirectChat ?? false;
    // Name + Avatar nur bei fremden Nachrichten in Gruppenräumen.
    final showSender = !isOwn && !isDm;
    final sender = firstEvent.senderFromMemoryOrFallback;
    final name = sender.calcDisplayname();
    final initial = name.isNotEmpty ? name[0].toUpperCase() : '?';
    final color = _colorFromId(firstEvent.senderId);

    return LayoutBuilder(builder: (context, constraints) {
      final rowWidth = constraints.maxWidth - 24; // 12 px Rand links/rechts
      final senderSpace =
          showSender ? _kBubbleAvatarSize + _kBubbleAvatarGap : 0.0;
      final maxBubbleWidth =
          ((rowWidth - senderSpace) * _kBubbleMaxWidthFactor).clamp(120.0, 560.0);

      final rows = <Widget>[];
      for (var j = 0; j < widget.events.length; j++) {
        final event = widget.events[j];
        final isFirst = j == 0;
        final isLast = j == widget.events.length - 1;

        final bubbleColumn = Column(
          crossAxisAlignment:
              isOwn ? CrossAxisAlignment.end : CrossAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            _Bubble(
              event: event,
              pt: pt,
              isOwn: isOwn,
              isFirst: isFirst,
              isLast: isLast,
              senderName: showSender && isFirst ? name : null,
              senderColor: color,
              maxWidth: maxBubbleWidth,
              timeline: widget.timeline,
            ),
            if (widget.timeline != null)
              _ReactionsRow(
                event: event,
                timeline: widget.timeline!,
                room: widget.room,
                currentUserId: widget.currentUserId,
                pt: pt,
              ),
          ],
        );

        final line = Row(
          mainAxisAlignment:
              isOwn ? MainAxisAlignment.end : MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (showSender) ...[
              SizedBox(
                width: _kBubbleAvatarSize,
                child: isFirst
                    ? _Avatar(
                        initial: initial,
                        color: color,
                        pt: pt,
                        size: _kBubbleAvatarSize,
                        avatarUri: sender.avatarUrl,
                      )
                    : null,
              ),
              const SizedBox(width: _kBubbleAvatarGap),
            ],
            Flexible(child: bubbleColumn),
          ],
        );

        rows.add(_selectableRow(
          event,
          pt,
          Padding(
            padding: EdgeInsets.only(
              top: isFirst ? pt.msgGap / 2 : 3,
              left: 12,
              right: 12,
            ),
            child: line,
          ),
        ));
        if (widget.readEventIds.contains(event.eventId)) {
          rows.add(_ReadMarker(pt: pt));
        }
        if (widget.fullyReadId == event.eventId && !isLast) {
          rows.add(_InlineUnreadDivider(key: widget.unreadDividerKey, pt: pt, fading: widget.unreadFading));
        }
      }

      if (widget.showStatusIndicator &&
          isOwn &&
          widget.room != null &&
          !widget.readEventIds.contains(widget.events.last.eventId)) {
        rows.add(Padding(
          padding: const EdgeInsets.only(right: 16, bottom: 1),
          child: Align(
            alignment: Alignment.centerRight,
            child: _MessageStatus(lastEvent: widget.events.last, pt: pt),
          ),
        ));
      }
      rows.add(const SizedBox(height: 2));

      return Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: rows,
      );
    });
  }
}

/// Eine einzelne Sprechblase (bzw. bei Bildern/Videos: das Medium ohne Blase).
class _Bubble extends StatelessWidget {
  final Event event;
  final PyramidTheme pt;
  final bool isOwn;
  final bool isFirst;
  final bool isLast;
  final String? senderName;
  final Color senderColor;
  final double maxWidth;
  final Timeline? timeline;

  const _Bubble({
    required this.event,
    required this.pt,
    required this.isOwn,
    required this.isFirst,
    required this.isLast,
    required this.senderName,
    required this.senderColor,
    required this.maxWidth,
    this.timeline,
  });

  Event get _displayEvent =>
      timeline != null ? event.getDisplayEvent(timeline!) : event;

  bool get _isVisualMedia {
    final e = _displayEvent;
    if (e.type == EventTypes.Sticker) return true;
    return e.type == EventTypes.Message &&
        (e.messageType == MessageTypes.Image ||
            e.messageType == MessageTypes.Video);
  }

  /// Eigene Blase: Akzentfarbe, mit der Fläche verrechnet (bleibt lesbar).
  static Color ownColor(PyramidTheme pt) => Color.alphaBlend(
        pt.accent.withValues(alpha: pt.isDark ? 0.30 : 0.24),
        pt.bg1,
      );

  BorderRadius get _radius {
    const big = Radius.circular(18);
    const small = Radius.circular(6);
    // Aufeinanderfolgende Blasen „kleben“ auf der Absenderseite zusammen.
    final topSide = isFirst ? big : small;
    final bottomSide = isLast ? big : small;
    return isOwn
        ? BorderRadius.only(
            topLeft: big, bottomLeft: big, topRight: topSide, bottomRight: bottomSide)
        : BorderRadius.only(
            topRight: big, bottomRight: big, topLeft: topSide, bottomLeft: bottomSide);
  }

  @override
  Widget build(BuildContext context) {
    final time = Text(
      _formatMessageTime(event.originServerTs),
      style: TextStyle(color: pt.fgDim, fontSize: 11),
    );
    final failed = event.status.isError
        ? _SendFailedRow(event: event, pt: pt)
        : null;

    if (_isVisualMedia) {
      // Ohne Blase: Bilder/Videos sollen so groß wie möglich sein.
      final box = _reservedImageSize(
        _displayEvent,
        maxW: maxWidth.clamp(80.0, 420.0),
        maxH: inlineMediaMaxHeight(context),
      );
      return Column(
        crossAxisAlignment:
            isOwn ? CrossAxisAlignment.end : CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: [
          if (senderName != null) _senderLabel(),
          SizedBox(
            width: box?.width ?? maxWidth,
            child: _MessageContent(event: event, pt: pt, timeline: timeline),
          ),
          ?failed,
          Padding(padding: const EdgeInsets.only(top: 2), child: time),
        ],
      );
    }

    return ConstrainedBox(
      constraints: BoxConstraints(maxWidth: maxWidth),
      child: Container(
        padding: const EdgeInsets.fromLTRB(12, 7, 12, 6),
        decoration: BoxDecoration(
          color: isOwn ? ownColor(pt) : pt.bg3,
          borderRadius: _radius,
        ),
        // Außen „end“: Inhalt (breitestes Kind) füllt die Blase, die Uhrzeit
        // sitzt unten rechts – ohne die Blase auf volle Breite zu ziehen.
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.end,
          mainAxisSize: MainAxisSize.min,
          children: [
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                if (senderName != null) _senderLabel(),
                _MessageContent(event: event, pt: pt, timeline: timeline),
                ?failed,
              ],
            ),
            const SizedBox(height: 2),
            time,
          ],
        ),
      ),
    );
  }

  Widget _senderLabel() => Padding(
        padding: const EdgeInsets.only(bottom: 2),
        child: Text(
          senderName!,
          style: TextStyle(
            color: senderColor,
            fontSize: 13,
            fontWeight: FontWeight.w600,
          ),
        ),
      );
}