import 'package:epubx/epubx.dart';
import '../models/book.dart';
import 'dart:io';

//解析epub文件的服务类
class EpubParserService {
  Future<EpubBook> parseEpubFile(String filePath) async {
    try {
      final bytes = await File(filePath).readAsBytes();
      return await EpubReader.readBook(bytes);
    } catch (e) {
      throw Exception('EPUB解析失败: $e');
    }
  }

  Future<Book> extractBookMetadata(EpubBook epubBook, String filePath) async {
    try {
      // 基本信息
      final title = epubBook.Title ?? '未知标题';

      // 处理作者列表
      final authorList = epubBook.AuthorList?.map((author) => author.toString()).toList() ?? [];
      final primaryAuthor = authorList.isNotEmpty ? authorList.first : '未知作者';

      // 计算章节数
      final chapters = epubBook.Chapters ?? [];
      final chapterCount = chapters.isNotEmpty ? chapters.length : null;

      // 如果有章节数，使用章节数作为totalPages
      final totalPages = chapterCount ?? 0;

      return Book.create(
        title: title,
        filePath: filePath,
        format: BookFormat.epub,
        fileSize: await File(filePath).length(),
        author: primaryAuthor,
        authors: authorList,
        chapterCount: chapterCount,
        totalPages: totalPages,
      );
    } catch (e) {
      throw Exception('提取元数据失败: $e');
    }
  }

  Future<String?> saveCoverImage(EpubBook epubBook, String bookId) async {
    // 如果没有封面图片，返回null
    if (epubBook.CoverImage == null) return null;

    // TODO: 这里需要实现保存封面图片的逻辑
    // 将封面图片保存到本地存储，并返回文件路径
    return null; // 暂时返回null，后续完善
  }
}