// 搜索 BLoC — 标签+心情筛选日记
//
// 状态机: SearchInitial → SearchLoading → SearchLoaded/SearchError
// Phase 1 使用简单的标签+心情筛选，后续可扩展全文搜索。

import 'package:flutter_bloc/flutter_bloc.dart';

import '../../../data/models/journal_entry.dart';
import '../../../data/repositories/journal_repository.dart';

part 'search_event.dart';
part 'search_state.dart';

/// 搜索 BLoC — 处理标签和心情筛选日记的状态转换
class SearchBloc extends Bloc<SearchEvent, SearchState> {
  final JournalRepository _journalRepo;

  SearchBloc({required JournalRepository journalRepository})
      : _journalRepo = journalRepository,
        super(const SearchInitial()) {
    on<SearchByMood>(_onSearchByMood);
    on<SearchByTag>(_onSearchByTag);
    on<SearchClear>(_onSearchClear);
  }

  /// 按心情筛选日记
  Future<void> _onSearchByMood(
    SearchByMood event,
    Emitter<SearchState> emit,
  ) async {
    emit(const SearchLoading());
    try {
      if (event.mood == null) {
        emit(const SearchLoaded());
        return;
      }
      final results = await _journalRepo.getJournals(
        mood: event.mood!.value,
        page: 1,
        pageSize: 50,
      );
      emit(SearchLoaded(
        results: results,
        activeMood: event.mood!.value,
      ));
    } catch (e) {
      emit(const SearchError('搜索失败，请重试'));
    }
  }

  /// 按标签筛选日记
  Future<void> _onSearchByTag(
    SearchByTag event,
    Emitter<SearchState> emit,
  ) async {
    emit(const SearchLoading());
    try {
      final results = await _journalRepo.getJournals(
        tag: event.tag,
        page: 1,
        pageSize: 50,
      );
      emit(SearchLoaded(
        results: results,
        activeTag: event.tag,
      ));
    } catch (e) {
      emit(const SearchError('搜索失败，请重试'));
    }
  }

  /// 清除搜索结果
  void _onSearchClear(
    SearchClear event,
    Emitter<SearchState> emit,
  ) {
    emit(const SearchLoaded());
  }
}