fix：对比原型增加功能交互

lib/data/api/report_data_source.dart

@@ -3,8 +3,10 @@ import 'dart:convert';
 import 'package:http/http.dart' as http;
 
 import '../models/models.dart';
+import '../repositories/report_repository.dart';
+import '../state/report_query.dart';
 
-abstract class ReportDataSource {
+abstract class ReportDataSource extends ReportRepository {
   Future<List<ReportCardModel>> recommended();
   Future<List<ReportCardModel>> reports();
   Future<List<Institution>> institutions();
@@ -12,9 +14,66 @@ abstract class ReportDataSource {
   Future<List<AudioItem>> listen();
   Future<ReportDetail> reportDetail(String reportId);
   Future<ModuleDetail> moduleDetail(String reportId, String moduleId);
+
+  @override
+  Future<List<ReportCardModel>> getRecommended({String? topic}) async {
+    final items = await recommended();
+    if (topic == null || topic == '全部') return items;
+    return items.where((item) => item.topics.contains(topic)).toList();
+  }
+
+  @override
+  Future<List<ReportCardModel>> getReports(ReportQuery query) async {
+    final currentSearch = query.search.trim().toLowerCase();
+    final items = await reports();
+    final filtered = items.where((item) {
+      final haystack =
+          '${item.titleCn} ${item.subtitleCn} ${item.oneLiner} '
+                  '${item.institution.nameCn} ${item.institution.nameEn} '
+                  '${item.topics.join(' ')}'
+              .toLowerCase();
+      if (currentSearch.isNotEmpty && !haystack.contains(currentSearch)) {
+        return false;
+      }
+      if (query.topic != null && !item.topics.contains(query.topic)) {
+        return false;
+      }
+      if (query.institutionId != null &&
+          item.institution.id != query.institutionId) {
+        return false;
+      }
+      if (query.hasAudio && !item.hasAudio) {
+        return false;
+      }
+      return true;
+    }).toList();
+    filtered.sort((a, b) {
+      final result = (b.releasedAt ?? '').compareTo(a.releasedAt ?? '');
+      return query.sort == ReportSort.oldest ? -result : result;
+    });
+    return filtered;
+  }
+
+  @override
+  Future<ReportDetail> getReportDetail(String reportId) =>
+      reportDetail(reportId);
+
+  @override
+  Future<List<Institution>> getInstitutions() => institutions();
+
+  @override
+  Future<Institution> getInstitutionDetail(String institutionId) =>
+      institutionDetail(institutionId);
+
+  @override
+  Future<List<AudioItem>> getListenItems() => listen();
+
+  @override
+  Future<ModuleDetail> getModuleDetail(String reportId, String moduleId) =>
+      moduleDetail(reportId, moduleId);
 }
 
-class RnbApiDataSource implements ReportDataSource {
+class RnbApiDataSource extends ReportDataSource {
   RnbApiDataSource({
     http.Client? client,
     this.baseUrl = const String.fromEnvironment('RNB_API_BASE'),
@@ -72,6 +131,8 @@ class RnbApiDataSource implements ReportDataSource {
 
   @override
   Future<ModuleDetail> moduleDetail(String reportId, String moduleId) async {
-    return ModuleDetail.fromJson(await _get('/reports/$reportId/modules/$moduleId'));
+    return ModuleDetail.fromJson(
+      await _get('/reports/$reportId/modules/$moduleId'),
+    );
   }
 }