import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:matrix/matrix.dart';
import 'package:pyramid/core/theme.dart';
import 'package:pyramid/features/chat/chat_provider.dart';

class PinnedMessagesPanel extends ConsumerWidget {
  final String roomId;
  final VoidCallback onClose;

  const PinnedMessagesPanel({
    super.key,
    required this.roomId,
    required this.onClose,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final pt = PyramidTheme.of(context);
    final room = ref.watch(roomProvider(roomId));
    final timeline = ref.watch(timelineProvider(roomId)).valueOrNull;

    if (room == null) return const SizedBox.shrink();

    final pinnedIds = List<String>.from(
      room.getState(EventTypes.RoomPinnedEvents)?.content['pinned'] as List? ?? [],
    );

    final pinned = pinnedIds
        .map((id) => timeline?.events.where((e) => e.eventId == id).firstOrNull)
        .where((e) => e != null)
        .cast<Event>()
        .toList();

    return Container(
      width: 320,
      decoration: BoxDecoration(
        color: pt.bg1,
        border: Border(left: BorderSide(color: pt.border)),
      ),
      child: Column(
        children: [
          // Header
          Container(
            height: 52,
            padding: const EdgeInsets.symmetric(horizontal: 16),
            decoration: BoxDecoration(
              border: Border(bottom: BorderSide(color: pt.border)),
            ),
            child: Row(
              children: [
                Icon(Icons.push_pin_rounded, size: 16, color: pt.fgMuted),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(
                    'Angepinnte Nachrichten',
                    style: TextStyle(
                      color: pt.fg,
                      fontSize: 15,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ),
                GestureDetector(
                  onTap: onClose,
                  child: Icon(Icons.close_rounded, size: 18, color: pt.fgDim),
                ),
              ],
            ),
          ),
          // List
          Expanded(
            child: pinnedIds.isEmpty
                ? Center(
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Icon(Icons.push_pin_outlined, size: 40, color: pt.fgDim),
                        const SizedBox(height: 12),
                        Text(
                          'Keine angepinnten Nachrichten',
                          style: TextStyle(color: pt.fgMuted, fontSize: 14),
                        ),
                      ],
                    ),
                  )
                : ListView.builder(
                    padding: const EdgeInsets.all(12),
                    itemCount: pinned.isEmpty ? pinnedIds.length : pinned.length,
                    itemBuilder: (ctx, i) {
                      if (pinned.isEmpty) {
                        return _PinnedPlaceholder(pt: pt);
                      }
                      return _PinnedMessageCard(
                        event: pinned[i],
                        room: room,
                        pt: pt,
                        onUnpin: () => _unpin(room, pinned[i].eventId),
                      );
                    },
                  ),
          ),
        ],
      ),
    );
  }

  void _unpin(Room room, String eventId) {
    final pinned = List<String>.from(
      room.getState(EventTypes.RoomPinnedEvents)?.content['pinned'] as List? ?? [],
    );
    pinned.remove(eventId);
    room.setPinnedEvents(pinned).catchError((_) => '');
  }
}

class _PinnedPlaceholder extends StatelessWidget {
  final PyramidTheme pt;
  const _PinnedPlaceholder({required this.pt});

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.only(bottom: 8),
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: pt.bg2,
        borderRadius: BorderRadius.circular(pt.rBase),
        border: Border.all(color: pt.border),
      ),
      child: Text(
        'Nachricht wird geladen…',
        style: TextStyle(color: pt.fgDim, fontSize: 13, fontStyle: FontStyle.italic),
      ),
    );
  }
}

class _PinnedMessageCard extends StatelessWidget {
  final Event event;
  final Room room;
  final PyramidTheme pt;
  final VoidCallback onUnpin;

  const _PinnedMessageCard({
    required this.event,
    required this.room,
    required this.pt,
    required this.onUnpin,
  });

  @override
  Widget build(BuildContext context) {
    final sender = event.senderFromMemoryOrFallback.calcDisplayname();
    final time = _formatTime(event.originServerTs);
    final body = event.body;

    return Container(
      margin: const EdgeInsets.only(bottom: 8),
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: pt.bg2,
        borderRadius: BorderRadius.circular(pt.rBase),
        border: Border.all(color: pt.border),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(Icons.push_pin_rounded, size: 12, color: pt.accent),
              const SizedBox(width: 6),
              Expanded(
                child: Text(
                  sender,
                  style: TextStyle(
                    color: pt.fg,
                    fontSize: 13,
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ),
              Text(time, style: TextStyle(color: pt.fgDim, fontSize: 11)),
              const SizedBox(width: 6),
              GestureDetector(
                onTap: onUnpin,
                child: Tooltip(
                  message: 'Entpinnen',
                  child: Icon(Icons.push_pin_outlined, size: 14, color: pt.fgDim),
                ),
              ),
            ],
          ),
          const SizedBox(height: 6),
          Text(
            body,
            style: TextStyle(color: pt.fgMuted, fontSize: 13),
            maxLines: 5,
            overflow: TextOverflow.ellipsis,
          ),
        ],
      ),
    );
  }

  String _formatTime(DateTime t) {
    final now = DateTime.now();
    final diff = now.difference(t);
    if (diff.inDays == 0) {
      return '${t.hour.toString().padLeft(2, '0')}:${t.minute.toString().padLeft(2, '0')}';
    }
    if (diff.inDays < 7) return 'vor ${diff.inDays}d';
    return '${t.day}.${t.month}.${t.year}';
  }
}