import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:result_monad/result_monad.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../models/auth/profile.dart';
import '../models/exec_error.dart';
import '../models/networking/paging_data.dart';
import '../models/search_results.dart';
import '../models/search_types.dart';
import 'networking/friendica_search_client_services.dart';

part 'search_result_services.g.dart';

@Riverpod(keepAlive: true)
SharedPreferences sharedPreferences(Ref ref) => throw UnimplementedError();

@riverpod
class SearchResultsManager extends _$SearchResultsManager {
  var nextPage = const PagingData();
  var searchResult = SearchResults.empty();

  @override
  Future<Result<SearchResults, ExecError>> build(
    Profile profile,
    SearchTypes searchType,
    String searchText, {
    int limit = 50,
  }) async {
    if (searchText.isEmpty) {
      return Result.ok(searchResult);
    }
    final result = await updateSearchResults(reset: true);
    return result;
  }

  Future<Result<SearchResults, ExecError>> updateSearchResults(
      {bool reset = true}) async {
    if (reset) {
      nextPage = PagingData(limit: limit);
      searchResult = SearchResults.empty();
    }

    final result = await ref.watch(
        searchResultsProvider(profile, searchType, searchText, nextPage)
            .future);
    return result
        .withResult((result) {
          searchResult = reset ? result.data : searchResult.merge(result.data);
          nextPage = result.next ?? genNextPageData();
        })
        .transform((_) => searchResult)
        .execErrorCast();
  }

  PagingData genNextPageData() {
    int offset = switch (searchType) {
      SearchTypes.account => searchResult.accounts.length,
      SearchTypes.statusesText => searchResult.statuses.length,
      SearchTypes.directLink => 0,
      SearchTypes.hashTag => searchResult.hashtags.length,
    };

    return PagingData(limit: limit, offset: offset);
  }
}