import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../core/api/api_client.dart';
import '../core/auth/auth_state.dart';
import '../core/config/app_constants.dart';
import '../core/models/page_result.dart';
import '../models/partner.dart';
import '../repositories/partner_repository.dart';
import 'connectivity_provider.dart';

final partnerRepositoryProvider = Provider<PartnerRepository>((ref) {
  return PartnerRepository(ref.watch(apiClientProvider));
});

// Supplier list provider for dropdowns
final supplierListProvider =
    AsyncNotifierProvider<PartnerListNotifier, PageResult<Partner>>(
  () => PartnerListNotifier(type: 'supplier'),
);

// Customer list provider
final customerListProvider =
    AsyncNotifierProvider<PartnerListNotifier, PageResult<Partner>>(
  () => PartnerListNotifier(type: 'customer'),
);

/// 工具栏/详细搜索的往来单位下拉专用：不分 supplier/customer、一次取全部。
/// 说明：历史 partner 的 type 多为默认 'supplier'（customer 常为空），
/// 按 type 过滤会漏项甚至空列表；下拉按「全部往来单位」呈现最稳。
final allPartnersProvider =
    AsyncNotifierProvider<PartnerListNotifier, PageResult<Partner>>(
  () => PartnerListNotifier(type: null, pageSize: 1000),
);

class PartnerListNotifier extends AsyncNotifier<PageResult<Partner>> {
  final String? type;
  int _page = 1;
  int _pageSize;
  String _keyword = '';
  PageResult<Partner>? _cache;

  PartnerListNotifier({this.type, int pageSize = AppConstants.defaultPageSize})
      : _pageSize = pageSize;

  @override
  Future<PageResult<Partner>> build() async {
    ref.watch(authStateProvider.select((s) => s.user?.shopId));
    ref.watch(networkRecoveryCountProvider);
    try {
      final result = await _fetch();
      _cache = result;
      return result;
    } catch (_) {
      if (_cache != null) return _cache!;
      rethrow;
    }
  }

  Future<PageResult<Partner>> _fetch() {
    return ref.read(partnerRepositoryProvider).list(
          type: type,
          keyword: _keyword.isEmpty ? null : _keyword,
          page: _page,
          pageSize: _pageSize,
        );
  }

  void setPage(int page) {
    _page = page;
    reload();
  }

  void setPageSize(int pageSize) {
    _pageSize = pageSize;
    _page = 1;
    reload();
  }

  void setKeyword(String keyword) {
    _keyword = keyword;
    _page = 1;
    reload();
  }

  void reload() {
    state = const AsyncValue.loading();
    _fetch().then((result) {
      _cache = result;
      state = AsyncValue.data(result);
    }, onError: (e, st) {
      if (_cache != null) {
        state = AsyncValue.data(_cache!);
      } else {
        state = AsyncValue.error(e, st);
      }
    });
  }

  Future<void> createPartner(Map<String, dynamic> data) async {
    await ref.read(partnerRepositoryProvider).create(data);
    reload();
  }

  Future<void> updatePartner(int id, Map<String, dynamic> data) async {
    await ref.read(partnerRepositoryProvider).update(id, data);
    reload();
  }

  Future<void> deletePartner(int id) async {
    await ref.read(partnerRepositoryProvider).delete(id);
    reload();
  }
}