part of '../channels_page.dart';

class _ChannelTile extends ConsumerWidget {
  final Channel channel;
  final bool isUnread;
  final bool isMuted;
  final String? currentPubkey;
  final VoidCallback onTap;

  /// Called when the user requests to mark this channel read (from long-press
  /// actions menu). Null for channels in built-in sections.
  final VoidCallback? onMarkRead;

  /// The user-defined section this channel currently belongs to, or null.
  final String? sectionId;

  const _ChannelTile({
    required this.channel,
    required this.isUnread,
    required this.currentPubkey,
    required this.onTap,
    this.isMuted = false,
    this.onMarkRead,
    this.sectionId,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final contentColor = isMuted
        ? navigationSecondaryForeground(context)
        : navigationPrimaryForeground(
            context,
          ).withValues(alpha: isUnread ? 1 : 0.8);

    return InkWell(
      borderRadius: BorderRadius.circular(Radii.md),
      onTap: onTap,
      onLongPress: () => _showChannelActions(context, ref),
      child: Padding(
        padding: const EdgeInsets.only(
          left: _kChannelSectionInset,
          right: _kChannelSectionInset,
          top: _kChannelRowVerticalPadding,
          bottom: _kChannelRowVerticalPadding,
        ),
        child: Row(
          children: [
            SizedBox(
              width: _kChannelLeadingWidth,
              child: Align(
                alignment: Alignment.centerLeft,
                child: channel.isDm
                    ? _DmAvatar(channel: channel, currentPubkey: currentPubkey)
                    : Icon(
                        channelIcon(channel),
                        key: ValueKey('channel-icon-${channel.id}'),
                        size: _kChannelIconSize,
                        color: contentColor,
                      ),
              ),
            ),
            const SizedBox(width: _kChannelLabelGap),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    resolveDmChannelDisplayLabel(
                      channel,
                      currentPubkey: currentPubkey,
                    ),
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    style: contentListTitleTextStyle.copyWith(
                      color: contentColor,
                      fontWeight: isUnread ? FontWeight.w700 : FontWeight.w400,
                    ),
                  ),
                ],
              ),
            ),
            if (channel.isEphemeral) ...[
              const SizedBox(width: Grid.xxs),
              _EphemeralBadge(channel: channel),
            ],
            if (isMuted) ...[
              const SizedBox(width: Grid.xxs),
              Icon(
                LucideIcons.bellOff,
                size: 12,
                color: context.colors.onSurface.withValues(alpha: 0.4),
              ),
            ],
            if (!channel.isMember && !channel.isDm)
              Padding(
                padding: const EdgeInsets.only(right: Grid.xxs),
                child: Container(
                  padding: const EdgeInsets.symmetric(
                    horizontal: Grid.half + 2,
                    vertical: 3,
                  ),
                  decoration: BoxDecoration(
                    color: context.colors.primary.withValues(alpha: 0.1),
                    borderRadius: BorderRadius.circular(Radii.sm),
                  ),
                  child: Text(
                    context.l10n.openChannel,
                    style: context.textTheme.labelSmall?.copyWith(
                      color: context.colors.primary,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ),
              ),
          ],
        ),
      ),
    );
  }

  void _showChannelActions(BuildContext context, WidgetRef ref) {
    showChannelActionsSheet(
      context: context,
      channel: channel,
      isUnread: isUnread,
      onMarkRead: onMarkRead,
      sectionId: sectionId,
    );
  }
}

class _DmAvatar extends ConsumerWidget {
  final Channel channel;
  final String? currentPubkey;

  const _DmAvatar({required this.channel, required this.currentPubkey});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final profiles = ref.watch(userCacheProvider);
    final presenceMap = ref.watch(presenceCacheProvider);
    final normalizedCurrent = currentPubkey?.toLowerCase();
    final otherPubkeys = [
      for (final pk in channel.participantPubkeys)
        if (pk.toLowerCase() != normalizedCurrent) pk.toLowerCase(),
    ];
    final visiblePubkeys = otherPubkeys.isNotEmpty
        ? otherPubkeys
        : channel.participantPubkeys.map((pk) => pk.toLowerCase()).toList();

    if (visiblePubkeys.length > 1) {
      return Container(
        width: _kDmAvatarSize,
        height: _kDmAvatarSize,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          color: context.colors.surfaceContainerHighest,
          shape: BoxShape.circle,
          border: Border.all(color: context.colors.outlineVariant),
        ),
        child: Text(
          '${visiblePubkeys.length}',
          style: context.textTheme.labelSmall?.copyWith(
            fontSize: 9,
            color: context.colors.onSurface,
            fontWeight: FontWeight.w600,
            height: 1,
          ),
        ),
      );
    }

    final otherPubkey = visiblePubkeys.isNotEmpty ? visiblePubkeys.first : null;
    final profile = otherPubkey != null ? profiles[otherPubkey] : null;

    // Trigger fetches if not cached yet.
    if (otherPubkey != null) {
      if (profile == null) {
        ref.read(userCacheProvider.notifier).preload([otherPubkey]);
      }
      ref.read(presenceCacheProvider.notifier).track([otherPubkey]);
    }

    final avatarUrl = profile?.avatarUrl;
    final initial =
        profile?.initial ??
        (channel.participants.isNotEmpty
            ? channel.participants.first[0].toUpperCase()
            : '?');
    final presence = otherPubkey != null
        ? (presenceMap[otherPubkey] ?? 'offline')
        : 'offline';

    return SizedBox(
      width: _kDmAvatarSize,
      height: _kDmAvatarSize,
      child: Stack(
        clipBehavior: Clip.none,
        children: [
          AvatarImage(
            imageUrl: avatarUrl,
            radius: _kDmAvatarSize / 2,
            backgroundColor: context.colors.primaryContainer,
            fallback: Text(
              initial,
              style: context.textTheme.labelSmall?.copyWith(
                fontSize: 9,
                color: context.colors.onPrimaryContainer,
                fontWeight: FontWeight.w600,
              ),
            ),
          ),
          Positioned(
            right: -1,
            bottom: -1,
            child: Container(
              width: 8,
              height: 8,
              decoration: BoxDecoration(
                color: _presenceColor(context, presence),
                shape: BoxShape.circle,
                border: Border.all(
                  color: context.theme.scaffoldBackgroundColor,
                  width: 1.5,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Color _presenceColor(BuildContext context, String presence) {
    return switch (presence) {
      'online' => context.appColors.success,
      'away' => context.appColors.warning,
      _ => context.colors.outline,
    };
  }
}