import 'package:flutter/foundation.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'downloaded_series.freezed.dart';
part 'downloaded_series.g.dart';

/// Status of a download operation
enum DownloadStatus {
  pending,
  downloading,
  complete,
  partial,
  failed;

  static DownloadStatus fromName(String name) {
    return DownloadStatus.values.firstWhere(
      (e) => e.name == name,
      orElse: () {
        debugPrint('Unknown DownloadStatus "$name", defaulting to pending');
        return DownloadStatus.pending;
      },
    );
  }
}

/// Content type of a downloaded chapter
enum ChapterContentType {
  epub,
  imageStream;

  static ChapterContentType fromName(String name) {
    return ChapterContentType.values.firstWhere(
      (e) => e.name == name,
      orElse: () {
        debugPrint('Unknown ChapterContentType "$name", defaulting to epub');
        return ChapterContentType.epub;
      },
    );
  }
}

/// Represents a downloaded series for offline reading
@freezed
class DownloadedSeries with _$DownloadedSeries {
  const factory DownloadedSeries({
    required String id,
    required String serverId,
    required String seriesFeedUrl,
    required String title,
    String? coverUrl,
    String? coverPath,
    String? thumbnailUrl,
    String? thumbnailPath,
    @Default(DownloadStatus.pending) DownloadStatus status,
    @Default(0) int totalChapters,
    @Default(0) int downloadedChaptersCount,
    DateTime? downloadedAt,
    required DateTime updatedAt,
  }) = _DownloadedSeries;

  const DownloadedSeries._();

  factory DownloadedSeries.fromJson(Map<String, dynamic> json) =>
      _$DownloadedSeriesFromJson(json);

  /// Create from database row
  factory DownloadedSeries.fromDatabase(Map<String, dynamic> row) {
    return DownloadedSeries(
      id: row['id'] as String,
      serverId: row['server_id'] as String,
      seriesFeedUrl: row['series_feed_url'] as String,
      title: row['title'] as String,
      coverUrl: row['cover_url'] as String?,
      coverPath: row['cover_path'] as String?,
      thumbnailUrl: row['thumbnail_url'] as String?,
      thumbnailPath: row['thumbnail_path'] as String?,
      status: DownloadStatus.fromName(row['status'] as String),
      totalChapters: row['total_chapters'] as int,
      downloadedChaptersCount: row['downloaded_chapters_count'] as int,
      downloadedAt: row['downloaded_at'] != null
          ? DateTime.fromMillisecondsSinceEpoch(row['downloaded_at'] as int)
          : null,
      updatedAt: DateTime.fromMillisecondsSinceEpoch(row['updated_at'] as int),
    );
  }

  /// Whether the download is fully complete
  bool get isComplete => status == DownloadStatus.complete;

  /// Whether the download is in progress
  bool get isDownloading => status == DownloadStatus.downloading;

  /// Progress fraction (0.0 to 1.0)
  double get progress {
    if (totalChapters == 0) return 0.0;
    return (downloadedChaptersCount / totalChapters).clamp(0.0, 1.0);
  }
}

extension DownloadedSeriesX on DownloadedSeries {
  Map<String, dynamic> toDatabase() {
    return {
      'id': id,
      'server_id': serverId,
      'series_feed_url': seriesFeedUrl,
      'title': title,
      'cover_url': coverUrl,
      'cover_path': coverPath,
      'thumbnail_url': thumbnailUrl,
      'thumbnail_path': thumbnailPath,
      'status': status.name,
      'total_chapters': totalChapters,
      'downloaded_chapters_count': downloadedChaptersCount,
      'downloaded_at': downloadedAt?.millisecondsSinceEpoch,
      'updated_at': updatedAt.millisecondsSinceEpoch,
    };
  }
}