import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/foundation.dart';
import '../map/map_provider_interface.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);
}

/// Filter for the community social feed stream.
enum FeedFilter {
  allActivity,
  forYou,
  nearbyPacks,
  clubOnly,
  following;

  String get displayName {
    switch (this) {
      case FeedFilter.allActivity:
        return 'All Activity';
      case FeedFilter.forYou:
        return 'For You';
      case FeedFilter.nearbyPacks:
        return 'Nearby Packs';
      case FeedFilter.clubOnly:
        return 'Club Only';
      case FeedFilter.following:
        return 'Following';
    }
  }
}

/// Motorcycle riding discipline / style categorization.
enum RidingDiscipline {
  all,
  canyonSport,
  advDualSport,
  touring,
  trackDay,
  cruiser;

  String get displayName {
    switch (this) {
      case RidingDiscipline.all:
        return 'All Styles';
      case RidingDiscipline.canyonSport:
        return '⚡ Canyon / Sport';
      case RidingDiscipline.advDualSport:
        return '🌲 ADV & Dirt';
      case RidingDiscipline.touring:
        return '🛣️ Touring';
      case RidingDiscipline.trackDay:
        return '🏁 Track Day';
      case RidingDiscipline.cruiser:
        return '🏍️ Cruiser';
    }
  }

  String get shortTag {
    switch (this) {
      case RidingDiscipline.all:
        return 'ALL';
      case RidingDiscipline.canyonSport:
        return 'CANYON';
      case RidingDiscipline.advDualSport:
        return 'ADV';
      case RidingDiscipline.touring:
        return 'TOURING';
      case RidingDiscipline.trackDay:
        return 'TRACK';
      case RidingDiscipline.cruiser:
        return 'CRUISE';
    }
  }
}

/// A comment on a community social feed post.
@immutable
class FeedPostComment {
  final String id;
  final String authorUid;
  final String authorDisplayName;
  final String? authorHandle;
  final String? authorAvatarPreset;
  final String content;
  final DateTime createdAt;

  const FeedPostComment({
    required this.id,
    required this.authorUid,
    required this.authorDisplayName,
    this.authorHandle,
    this.authorAvatarPreset,
    required this.content,
    required this.createdAt,
  });

  Map<String, dynamic> toJson() => {
        'id': id,
        'authorUid': authorUid,
        'authorDisplayName': authorDisplayName,
        if (authorHandle != null) 'authorHandle': authorHandle,
        if (authorAvatarPreset != null) 'authorAvatarPreset': authorAvatarPreset,
        'content': content,
        'createdAt': _dateTimeToFirestore(createdAt),
      };

  factory FeedPostComment.fromJson(Map<String, dynamic> json) {
    return FeedPostComment(
      id: json['id'] as String? ?? '',
      authorUid: json['authorUid'] as String? ?? '',
      authorDisplayName: json['authorDisplayName'] as String? ?? 'Rider',
      authorHandle: json['authorHandle'] as String?,
      authorAvatarPreset: json['authorAvatarPreset'] as String?,
      content: json['content'] as String? ?? '',
      createdAt: _parseDateTime(json['createdAt']) ?? DateTime.now(),
    );
  }
}

/// Visual snapshot type for a feed item.
enum FeedSnapshotType {
  routeTrack,
  scenicPhoto,
}

/// A community social feed item (Stitch SOC-01).
@immutable
class SocialFeedItem {
  final String id;
  final String authorUid;
  final String authorDisplayName;
  final String authorHandle;
  final String? authorAvatarPreset;
  final String? authorBadge; // e.g. 'PRO', 'ROAD CAPTAIN', 'FOUNDER'
  final String? clubName; // e.g. 'Bay Area Twisties Club'
  final String locationName; // e.g. "Alice's Restaurant", "Mulholland Hwy"
  final DateTime timestamp;
  final String rideTitle; // e.g. "Sunday Skyline & Pescadero Carve"
  final String bikeModel; // e.g. "2024 Ducati Streetfighter V4"

  // Inset Telemetry Metrics
  final double distanceMiles;
  final int durationSeconds;
  final double maxLeanAngleDeg;
  final String maxLeanSide; // 'RIGHT', 'LEFT', 'PEAK'
  final String paceFactor; // e.g. '1.32x Spirited'
  final int hazardCount; // e.g. 0
  final int elevationFt; // e.g. +2140

  // Quality & Discipline Scoping
  final RidingDiscipline discipline;
  final String? regionName;
  final bool isFeatured;

  // Visual Snapshot Module
  final FeedSnapshotType snapshotType;
  final List<AppLatLng> routePoints;
  final String? photoUrl;
  final String? photoCaption;
  final bool isGpsVerified;
  final bool isDemo;

  // Kudos & Reactions
  final int fistBumpCount;
  final List<String> fistBumpUserIds;
  final List<FeedPostComment> comments;

  const SocialFeedItem({
    required this.id,
    required this.authorUid,
    required this.authorDisplayName,
    required this.authorHandle,
    this.authorAvatarPreset,
    this.authorBadge,
    this.clubName,
    required this.locationName,
    required this.timestamp,
    required this.rideTitle,
    required this.bikeModel,
    required this.distanceMiles,
    required this.durationSeconds,
    required this.maxLeanAngleDeg,
    this.maxLeanSide = 'RIGHT',
    this.paceFactor = '1.2x Spirited',
    this.hazardCount = 0,
    this.elevationFt = 1200,
    this.discipline = RidingDiscipline.canyonSport,
    this.regionName,
    this.isFeatured = false,
    this.snapshotType = FeedSnapshotType.routeTrack,
    this.routePoints = const [],
    this.photoUrl,
    this.photoCaption,
    this.isGpsVerified = true,
    this.isDemo = false,
    this.fistBumpCount = 0,
    this.fistBumpUserIds = const [],
    this.comments = const [],
  });

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

  SocialFeedItem copyWith({
    String? id,
    String? authorUid,
    String? authorDisplayName,
    String? authorHandle,
    String? authorAvatarPreset,
    String? authorBadge,
    String? clubName,
    String? locationName,
    DateTime? timestamp,
    String? rideTitle,
    String? bikeModel,
    double? distanceMiles,
    int? durationSeconds,
    double? maxLeanAngleDeg,
    String? maxLeanSide,
    String? paceFactor,
    int? hazardCount,
    int? elevationFt,
    RidingDiscipline? discipline,
    String? regionName,
    bool? isFeatured,
    FeedSnapshotType? snapshotType,
    List<AppLatLng>? routePoints,
    String? photoUrl,
    String? photoCaption,
    bool? isGpsVerified,
    bool? isDemo,
    int? fistBumpCount,
    List<String>? fistBumpUserIds,
    List<FeedPostComment>? comments,
  }) {
    return SocialFeedItem(
      id: id ?? this.id,
      authorUid: authorUid ?? this.authorUid,
      authorDisplayName: authorDisplayName ?? this.authorDisplayName,
      authorHandle: authorHandle ?? this.authorHandle,
      authorAvatarPreset: authorAvatarPreset ?? this.authorAvatarPreset,
      authorBadge: authorBadge ?? this.authorBadge,
      clubName: clubName ?? this.clubName,
      locationName: locationName ?? this.locationName,
      timestamp: timestamp ?? this.timestamp,
      rideTitle: rideTitle ?? this.rideTitle,
      bikeModel: bikeModel ?? this.bikeModel,
      distanceMiles: distanceMiles ?? this.distanceMiles,
      durationSeconds: durationSeconds ?? this.durationSeconds,
      maxLeanAngleDeg: maxLeanAngleDeg ?? this.maxLeanAngleDeg,
      maxLeanSide: maxLeanSide ?? this.maxLeanSide,
      paceFactor: paceFactor ?? this.paceFactor,
      hazardCount: hazardCount ?? this.hazardCount,
      elevationFt: elevationFt ?? this.elevationFt,
      discipline: discipline ?? this.discipline,
      regionName: regionName ?? this.regionName,
      isFeatured: isFeatured ?? this.isFeatured,
      snapshotType: snapshotType ?? this.snapshotType,
      routePoints: routePoints ?? this.routePoints,
      photoUrl: photoUrl ?? this.photoUrl,
      photoCaption: photoCaption ?? this.photoCaption,
      isGpsVerified: isGpsVerified ?? this.isGpsVerified,
      isDemo: isDemo ?? this.isDemo,
      fistBumpCount: fistBumpCount ?? this.fistBumpCount,
      fistBumpUserIds: fistBumpUserIds ?? this.fistBumpUserIds,
      comments: comments ?? this.comments,
    );
  }

  Map<String, dynamic> toJson() => {
        'id': id,
        'authorUid': authorUid,
        'authorDisplayName': authorDisplayName,
        'authorHandle': authorHandle,
        if (authorAvatarPreset != null) 'authorAvatarPreset': authorAvatarPreset,
        if (authorBadge != null) 'authorBadge': authorBadge,
        if (clubName != null) 'clubName': clubName,
        'locationName': locationName,
        'timestamp': _dateTimeToFirestore(timestamp),
        'rideTitle': rideTitle,
        'bikeModel': bikeModel,
        'distanceMiles': distanceMiles,
        'durationSeconds': durationSeconds,
        'maxLeanAngleDeg': maxLeanAngleDeg,
        'maxLeanSide': maxLeanSide,
        'paceFactor': paceFactor,
        'hazardCount': hazardCount,
        'elevationFt': elevationFt,
        'discipline': discipline.name,
        if (regionName != null) 'regionName': regionName,
        'isFeatured': isFeatured,
        'snapshotType': snapshotType.name,
        'routePoints': routePoints.map((p) => {'lat': p.latitude, 'lng': p.longitude}).toList(),
        if (photoUrl != null) 'photoUrl': photoUrl,
        if (photoCaption != null) 'photoCaption': photoCaption,
        'isGpsVerified': isGpsVerified,
        'isDemo': isDemo,
        'fistBumpCount': fistBumpCount,
        'fistBumpUserIds': fistBumpUserIds,
        'comments': comments.map((c) => c.toJson()).toList(),
      };

  factory SocialFeedItem.fromJson(Map<String, dynamic> json) {
    final routeList = json['routePoints'] as List<dynamic>? ?? [];
    final points = <AppLatLng>[];
    for (final item in routeList) {
      if (item is Map) {
        final lat = (item['lat'] as num?)?.toDouble();
        final lng = (item['lng'] as num?)?.toDouble();
        if (lat != null && lng != null) {
          points.add(AppLatLng(lat, lng));
        }
      }
    }

    final commentList = json['comments'] as List<dynamic>? ?? [];
    final comments = commentList
        .whereType<Map<String, dynamic>>()
        .map((c) => FeedPostComment.fromJson(c))
        .toList();

    return SocialFeedItem(
      id: json['id'] as String? ?? '',
      authorUid: json['authorUid'] as String? ?? '',
      authorDisplayName: json['authorDisplayName'] as String? ?? 'Rider',
      authorHandle: json['authorHandle'] as String? ?? 'rider',
      authorAvatarPreset: json['authorAvatarPreset'] as String?,
      authorBadge: json['authorBadge'] as String?,
      clubName: json['clubName'] as String?,
      locationName: json['locationName'] as String? ?? 'Canyon Route',
      timestamp: _parseDateTime(json['timestamp']) ?? DateTime.now(),
      rideTitle: json['rideTitle'] as String? ?? 'Afternoon Carve',
      bikeModel: json['bikeModel'] as String? ?? 'Motorcycle',
      distanceMiles: (json['distanceMiles'] as num?)?.toDouble() ?? 0.0,
      durationSeconds: (json['durationSeconds'] as num?)?.toInt() ?? 0,
      maxLeanAngleDeg: (json['maxLeanAngleDeg'] as num?)?.toDouble() ?? 0.0,
      maxLeanSide: json['maxLeanSide'] as String? ?? 'RIGHT',
      paceFactor: json['paceFactor'] as String? ?? '1.0x',
      hazardCount: (json['hazardCount'] as num?)?.toInt() ?? 0,
      elevationFt: (json['elevationFt'] as num?)?.toInt() ?? 0,
      discipline: json['discipline'] != null
          ? RidingDiscipline.values.firstWhere(
              (d) => d.name == json['discipline'],
              orElse: () => RidingDiscipline.canyonSport,
            )
          : RidingDiscipline.canyonSport,
      regionName: json['regionName'] as String?,
      isFeatured: json['isFeatured'] as bool? ?? false,
      snapshotType: json['snapshotType'] == 'scenicPhoto'
          ? FeedSnapshotType.scenicPhoto
          : FeedSnapshotType.routeTrack,
      routePoints: points,
      photoUrl: json['photoUrl'] as String?,
      photoCaption: json['photoCaption'] as String?,
      isGpsVerified: json['isGpsVerified'] as bool? ?? true,
      isDemo: json['isDemo'] as bool? ?? false,
      fistBumpCount: (json['fistBumpCount'] as num?)?.toInt() ?? 0,
      fistBumpUserIds: (json['fistBumpUserIds'] as List<dynamic>?)?.cast<String>() ?? [],
      comments: comments,
    );
  }
}