import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/foundation.dart';
import 'club_models.dart';

DateTime? _parseDateTime(dynamic value) {
  if (value == null) return null;
  if (value is Timestamp) return value.toDate();
  if (value is DateTime) return value;
  if (value is String) return DateTime.tryParse(value);
  if (value is int) return DateTime.fromMillisecondsSinceEpoch(value);
  return null;
}

dynamic _dateTimeToFirestore(DateTime? dt) {
  if (dt == null) return null;
  return Timestamp.fromDate(dt);
}

/// Comment on a Club Wall post.
@immutable
class ClubWallComment {
  final String id;
  final String postId;
  final String authorUid;
  final String authorDisplayName;
  final String? authorHandle;
  final String? authorAvatarUrl;
  final String? authorDisplayRank;
  final ClubRole authorRole;
  final String content;
  final DateTime createdAt;

  const ClubWallComment({
    required this.id,
    required this.postId,
    required this.authorUid,
    required this.authorDisplayName,
    this.authorHandle,
    this.authorAvatarUrl,
    this.authorDisplayRank,
    this.authorRole = ClubRole.member,
    required this.content,
    required this.createdAt,
  });

  Map<String, dynamic> toJson() => {
        'id': id,
        'postId': postId,
        'authorUid': authorUid,
        'authorDisplayName': authorDisplayName,
        if (authorHandle != null) 'authorHandle': authorHandle,
        if (authorAvatarUrl != null) 'authorAvatarUrl': authorAvatarUrl,
        if (authorDisplayRank != null) 'authorDisplayRank': authorDisplayRank,
        'authorRole': authorRole.name,
        'content': content,
        'createdAt': createdAt.toIso8601String(),
      };

  factory ClubWallComment.fromJson(Map<String, dynamic> json) {
    return ClubWallComment(
      id: json['id'] as String? ?? '',
      postId: json['postId'] as String? ?? '',
      authorUid: json['authorUid'] as String? ?? '',
      authorDisplayName: json['authorDisplayName'] as String? ?? 'Rider',
      authorHandle: json['authorHandle'] as String?,
      authorAvatarUrl: json['authorAvatarUrl'] as String?,
      authorDisplayRank: json['authorDisplayRank'] as String?,
      authorRole: ClubRole.fromString(json['authorRole'] as String?),
      content: json['content'] as String? ?? '',
      createdAt: _parseDateTime(json['createdAt']) ?? DateTime.now(),
    );
  }
}

/// Post on a Club Wall discussion board.
@immutable
class ClubWallPost {
  final String id;
  final String clubId;
  final String authorUid;
  final String authorDisplayName;
  final String? authorHandle;
  final String? authorAvatarUrl;
  final String? authorDisplayRank;
  final ClubRole authorRole;
  final String content;
  final DateTime createdAt;
  final bool isPinned;
  final int fistBumpCount;
  final List<String> fistBumpUserIds;
  final List<ClubWallComment> comments;

  const ClubWallPost({
    required this.id,
    required this.clubId,
    required this.authorUid,
    required this.authorDisplayName,
    this.authorHandle,
    this.authorAvatarUrl,
    this.authorDisplayRank,
    this.authorRole = ClubRole.member,
    required this.content,
    required this.createdAt,
    this.isPinned = false,
    this.fistBumpCount = 0,
    this.fistBumpUserIds = const [],
    this.comments = const [],
  });

  bool isFistBumpedBy(String? uid) {
    if (uid == null) return false;
    return fistBumpUserIds.contains(uid);
  }

  ClubWallPost copyWith({
    String? id,
    String? clubId,
    String? authorUid,
    String? authorDisplayName,
    String? authorHandle,
    String? authorAvatarUrl,
    String? authorDisplayRank,
    ClubRole? authorRole,
    String? content,
    DateTime? createdAt,
    bool? isPinned,
    int? fistBumpCount,
    List<String>? fistBumpUserIds,
    List<ClubWallComment>? comments,
  }) {
    return ClubWallPost(
      id: id ?? this.id,
      clubId: clubId ?? this.clubId,
      authorUid: authorUid ?? this.authorUid,
      authorDisplayName: authorDisplayName ?? this.authorDisplayName,
      authorHandle: authorHandle ?? this.authorHandle,
      authorAvatarUrl: authorAvatarUrl ?? this.authorAvatarUrl,
      authorDisplayRank: authorDisplayRank ?? this.authorDisplayRank,
      authorRole: authorRole ?? this.authorRole,
      content: content ?? this.content,
      createdAt: createdAt ?? this.createdAt,
      isPinned: isPinned ?? this.isPinned,
      fistBumpCount: fistBumpCount ?? this.fistBumpCount,
      fistBumpUserIds: fistBumpUserIds ?? this.fistBumpUserIds,
      comments: comments ?? this.comments,
    );
  }

  Map<String, dynamic> toFirestore() => {
        'id': id,
        'clubId': clubId,
        'authorUid': authorUid,
        'authorDisplayName': authorDisplayName,
        if (authorHandle != null) 'authorHandle': authorHandle,
        if (authorAvatarUrl != null) 'authorAvatarUrl': authorAvatarUrl,
        if (authorDisplayRank != null) 'authorDisplayRank': authorDisplayRank,
        'authorRole': authorRole.name,
        'content': content,
        'createdAt': _dateTimeToFirestore(createdAt),
        'isPinned': isPinned,
        'fistBumpCount': fistBumpCount,
        'fistBumpUserIds': fistBumpUserIds,
        'comments': comments.map((c) => c.toJson()).toList(),
      };

  Map<String, dynamic> toJson() => {
        'id': id,
        'clubId': clubId,
        'authorUid': authorUid,
        'authorDisplayName': authorDisplayName,
        if (authorHandle != null) 'authorHandle': authorHandle,
        if (authorAvatarUrl != null) 'authorAvatarUrl': authorAvatarUrl,
        if (authorDisplayRank != null) 'authorDisplayRank': authorDisplayRank,
        'authorRole': authorRole.name,
        'content': content,
        'createdAt': createdAt.toIso8601String(),
        'isPinned': isPinned,
        'fistBumpCount': fistBumpCount,
        'fistBumpUserIds': fistBumpUserIds,
        'comments': comments.map((c) => c.toJson()).toList(),
      };

  factory ClubWallPost.fromFirestore(DocumentSnapshot doc) {
    final data = doc.data() as Map<String, dynamic>? ?? {};
    return ClubWallPost.fromJson(data, idOverride: doc.id);
  }

  factory ClubWallPost.fromJson(Map<String, dynamic> json, {String? idOverride}) {
    final rawComments = json['comments'] as List<dynamic>? ?? [];
    final commentsList = rawComments
        .map((c) => ClubWallComment.fromJson(Map<String, dynamic>.from(c as Map)))
        .toList();

    final rawFistBumps = json['fistBumpUserIds'] as List<dynamic>? ?? [];
    final fistBumpList = rawFistBumps.map((e) => e.toString()).toList();

    return ClubWallPost(
      id: idOverride ?? json['id'] as String? ?? '',
      clubId: json['clubId'] as String? ?? '',
      authorUid: json['authorUid'] as String? ?? '',
      authorDisplayName: json['authorDisplayName'] as String? ?? 'Rider',
      authorHandle: json['authorHandle'] as String?,
      authorAvatarUrl: json['authorAvatarUrl'] as String?,
      authorDisplayRank: json['authorDisplayRank'] as String?,
      authorRole: ClubRole.fromString(json['authorRole'] as String?),
      content: json['content'] as String? ?? '',
      createdAt: _parseDateTime(json['createdAt']) ?? DateTime.now(),
      isPinned: json['isPinned'] as bool? ?? false,
      fistBumpCount: (json['fistBumpCount'] as num?)?.toInt() ?? fistBumpList.length,
      fistBumpUserIds: fistBumpList,
      comments: commentsList,
    );
  }

  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is ClubWallPost &&
          runtimeType == other.runtimeType &&
          id == other.id &&
          clubId == other.clubId &&
          content == other.content &&
          isPinned == other.isPinned &&
          fistBumpCount == other.fistBumpCount;

  @override
  int get hashCode =>
      id.hashCode ^
      clubId.hashCode ^
      content.hashCode ^
      isPinned.hashCode ^
      fistBumpCount.hashCode;
}