import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

import '../../../common/theme/theme.dart';
import '../../../sample/community_sample_data.dart';

/// Palet lembut khusus EnakCommunity.
class CommunityColor {
  static const Color background = Color(0xFFFAF7F5);
  static const Color blush = Color(0xFFFFEEEC);
  static const Color blushDeep = Color(0xFFFFDCD7);
  static const Color divider = Color(0xFFF1ECE9);
  static const Color muted = Color(0xFF9A918D);

  /// Pasangan (latar, aksen) untuk komunitas & avatar.
  static const List<(Color, Color)> tints = [
    (Color(0xFFFFF1E6), Color(0xFFE07A3F)), // peach
    (Color(0xFFF1ECE4), Color(0xFF8A6A4F)), // latte
    (Color(0xFFEAF3FC), Color(0xFF4A86C5)), // sky
    (Color(0xFFFFEEEC), Color(0xFFD14B4B)), // blush
    (Color(0xFFE9F7EF), Color(0xFF3F9A67)), // mint
    (Color(0xFFF1EDFB), Color(0xFF7D63C9)), // lavender
  ];

  static (Color, Color) tintOf(int index) => tints[index % tints.length];
}

/// Komunitas yang diikuti, dibagi antar layar. Sementara di memori sampai
/// API komunitas tersedia.
final ValueNotifier<Set<String>> joinedCommunityIds = ValueNotifier({
  for (final group in communityGroups)
    if (group.isJoined) group.id,
});

void toggleJoinCommunity(String groupId) {
  final ids = {...joinedCommunityIds.value};
  if (!ids.remove(groupId)) ids.add(groupId);
  joinedCommunityIds.value = ids;
}

/// Bayangan tipis agar kartu tampak "mengambang" tanpa garis tepi.
const List<BoxShadow> communitySoftShadow = [
  BoxShadow(color: Color(0x0D3B2A24), blurRadius: 24, offset: Offset(0, 8)),
];

BoxDecoration communityCardDecoration({double radius = 20}) => BoxDecoration(
  color: AppColor.white,
  borderRadius: BorderRadius.circular(radius),
  boxShadow: communitySoftShadow,
);

/// "Baru saja", "5 mnt", "3 jam", "2 hari", lalu tanggal pendek.
String formatTimeAgo(DateTime time) {
  final diff = DateTime.now().difference(time);
  if (diff.inMinutes < 1) return 'Baru saja';
  if (diff.inHours < 1) return '${diff.inMinutes} mnt';
  if (diff.inDays < 1) return '${diff.inHours} jam';
  if (diff.inDays < 7) return '${diff.inDays} hari';
  return DateFormat('d MMM', 'id_ID').format(time);
}

/// 950 → "950", 12480 → "12,4rb".
String formatCompact(int value) {
  if (value < 1000) return '$value';
  if (value < 1000000) {
    return '${NumberFormat('0.#', 'id_ID').format(value / 1000)}rb';
  }
  return '${NumberFormat('0.#', 'id_ID').format(value / 1000000)}jt';
}

/// Avatar inisial dengan warna lembut yang konsisten per anggota.
class CommunityAvatar extends StatelessWidget {
  const CommunityAvatar({super.key, required this.member, this.size = 40});

  final CommunityMember member;
  final double size;

  @override
  Widget build(BuildContext context) {
    final (background, accent) = CommunityColor.tintOf(
      member.id.codeUnits.fold(0, (sum, c) => sum + c),
    );

    return Container(
      width: size,
      height: size,
      alignment: Alignment.center,
      decoration: BoxDecoration(color: background, shape: BoxShape.circle),
      child: Text(
        member.initials,
        style: AppStyle.md.copyWith(
          fontSize: size * 0.36,
          color: accent,
          fontWeight: FontWeight.w700,
        ),
      ),
    );
  }
}

/// Deretan avatar bertumpuk, mis. peserta event.
class CommunityAvatarStack extends StatelessWidget {
  const CommunityAvatarStack({
    super.key,
    required this.members,
    this.size = 26,
    this.max = 3,
  });

  final List<CommunityMember> members;
  final double size;
  final int max;

  @override
  Widget build(BuildContext context) {
    final shown = members.take(max).toList();
    final overlap = size * 0.65;

    return SizedBox(
      width: size + overlap * (shown.length - 1),
      height: size,
      child: Stack(
        children: [
          for (var i = 0; i < shown.length; i++)
            Positioned(
              left: overlap * i,
              child: Container(
                padding: const EdgeInsets.all(1.5),
                decoration: const BoxDecoration(
                  color: AppColor.white,
                  shape: BoxShape.circle,
                ),
                child: CommunityAvatar(member: shown[i], size: size - 3),
              ),
            ),
        ],
      ),
    );
  }
}

/// Emoji komunitas di atas kotak berwarna lembut.
class CommunityEmojiBadge extends StatelessWidget {
  const CommunityEmojiBadge({super.key, required this.group, this.size = 44});

  final CommunityGroup group;
  final double size;

  @override
  Widget build(BuildContext context) {
    final (background, _) = CommunityColor.tintOf(group.tint);

    return Container(
      width: size,
      height: size,
      alignment: Alignment.center,
      decoration: BoxDecoration(
        color: background,
        borderRadius: BorderRadius.circular(size * 0.32),
      ),
      child: Text(group.emoji, style: TextStyle(fontSize: size * 0.48)),
    );
  }
}

/// Tombol pil "Gabung" / "Tergabung".
class CommunityJoinButton extends StatelessWidget {
  const CommunityJoinButton({
    super.key,
    required this.isJoined,
    required this.onPressed,
    this.compact = false,
  });

  final bool isJoined;
  final VoidCallback onPressed;
  final bool compact;

  @override
  Widget build(BuildContext context) {
    return AnimatedContainer(
      duration: const Duration(milliseconds: 200),
      decoration: BoxDecoration(
        color: isJoined ? CommunityColor.blush : AppColor.primary,
        borderRadius: BorderRadius.circular(999),
      ),
      child: Material(
        type: MaterialType.transparency,
        child: InkWell(
          borderRadius: BorderRadius.circular(999),
          onTap: onPressed,
          child: Padding(
            padding: EdgeInsets.symmetric(
              horizontal: compact ? 12 : 16,
              vertical: compact ? 6 : 8,
            ),
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                Icon(
                  isJoined ? Icons.check_rounded : Icons.add_rounded,
                  size: compact ? 14 : 16,
                  color: isJoined ? AppColor.primary : AppColor.white,
                ),
                const SizedBox(width: 4),
                Text(
                  isJoined ? 'Tergabung' : 'Gabung',
                  style: (compact ? AppStyle.xs : AppStyle.sm).copyWith(
                    color: isJoined ? AppColor.primary : AppColor.white,
                    fontWeight: FontWeight.w700,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

/// Judul seksi dengan aksi opsional di kanan.
class CommunitySectionTitle extends StatelessWidget {
  const CommunitySectionTitle({
    super.key,
    required this.title,
    this.actionLabel,
    this.onAction,
  });

  final String title;
  final String? actionLabel;
  final VoidCallback? onAction;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(20, 20, 12, 10),
      child: Row(
        children: [
          Expanded(
            child: Text(
              title,
              style: AppStyle.lg.copyWith(fontWeight: FontWeight.w700),
            ),
          ),
          if (actionLabel != null)
            TextButton(
              onPressed: onAction,
              child: Text(
                actionLabel!,
                style: AppStyle.sm.copyWith(
                  color: AppColor.primary,
                  fontWeight: FontWeight.w700,
                ),
              ),
            ),
        ],
      ),
    );
  }
}