88 lines
2.8 KiB
Dart
88 lines
2.8 KiB
Dart
 
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import '../models/article.dart';
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import '../models/briefing.dart';
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import '../models/news_source.dart';
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class SummarizerException implements Exception {
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SummarizerException(this.message);
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final String message;
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@override
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String toString() => message;
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}
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/// Something that can turn articles into summaries. Implemented by the
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/// direct Claude API client and by the n8n webhook bridge.
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abstract class Summarizer {
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String get name;
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Future<String> summarizeArticle(Article article, String text, SourceLanguage language);
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Future<DailyBriefing> createBriefing(List<Article> articles, SourceLanguage language);
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}
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/// Shared prompt material and response mapping for all summarizers.
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class BriefingInput {
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BriefingInput(List<Article> articles)
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: byId = {for (var i = 0; i < articles.length; i++) 'a${i + 1}': articles[i]};
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/// Short ids keep the prompt compact and are easy for the model to cite.
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final Map<String, Article> byId;
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static const excerptChars = 220;
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String toPromptList() {
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final buffer = StringBuffer();
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byId.forEach((id, a) {
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final excerpt = a.excerpt.length > excerptChars
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? '${a.excerpt.substring(0, excerptChars)}…'
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: a.excerpt;
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buffer.writeln('[$id] (${a.source.name}) ${a.title}'
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'${excerpt.isEmpty ? '' : ' — $excerpt'}');
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});
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return buffer.toString();
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}
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List<Map<String, dynamic>> toJsonList() => [
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for (final e in byId.entries)
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{
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'id': e.key,
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'title': e.value.title,
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'url': e.value.link,
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'source': e.value.source.name,
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'language': e.value.source.language.name,
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'published': e.value.published?.toIso8601String(),
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'excerpt': e.value.excerpt,
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}
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];
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/// Maps `{intro, topics: [{title, summary, article_ids}]}` onto a briefing.
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DailyBriefing toBriefing(Map<String, dynamic> json, String generatedBy) {
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final topics = (json['topics'] as List? ?? []).map((t) {
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final topic = t as Map<String, dynamic>;
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final ids = (topic['article_ids'] as List? ?? []).cast<String>();
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return BriefingTopic(
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title: topic['title'] as String? ?? '',
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summary: topic['summary'] as String? ?? '',
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sources: [
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for (final id in ids)
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if (byId[id] != null)
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ArticleRef(
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title: byId[id]!.title,
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url: byId[id]!.link,
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sourceName: byId[id]!.source.name,
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),
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],
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);
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}).toList();
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return DailyBriefing(
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createdAt: DateTime.now(),
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intro: json['intro'] as String? ?? '',
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topics: topics,
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generatedBy: generatedBy,
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);
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}
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}
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String languageName(SourceLanguage language) =>
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language == SourceLanguage.de ? 'German' : 'English';
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