jiu/client/lib/providers/inventory_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../core/api/api_client.dart';
import '../core/auth/auth_state.dart';
import '../core/models/page_result.dart';
import '../models/inventory.dart';
import '../repositories/inventory_repository.dart';

final inventoryRepositoryProvider = Provider<InventoryRepository>((ref) {
  return InventoryRepository(ref.watch(apiClientProvider));
});

final inventoryListProvider =
    AsyncNotifierProvider<InventoryListNotifier, PageResult<Inventory>>(
  InventoryListNotifier.new,
);

class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
  int _page = 1;
  int? _warehouseId;
  String _keyword = '';
  PageResult<Inventory>? _cache;

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

  Future<PageResult<Inventory>> _fetch() {
    return ref.read(inventoryRepositoryProvider).listInventory(
          warehouseId: _warehouseId,
          keyword: _keyword.isEmpty ? null : _keyword,
          page: _page,
          pageSize: 50,
        );
  }

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

  void setWarehouseId(int? id) {
    _warehouseId = id;
    _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);
      }
    });
  }
}

final inventoryLogProvider =
    AsyncNotifierProvider<InventoryLogNotifier, PageResult<InventoryLog>>(
  InventoryLogNotifier.new,
);

class InventoryLogNotifier extends AsyncNotifier<PageResult<InventoryLog>> {
  int _page = 1;
  PageResult<InventoryLog>? _cache;

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

  Future<PageResult<InventoryLog>> _fetch() {
    return ref.read(inventoryRepositoryProvider).listLogs(
          page: _page,
          pageSize: 50,
        );
  }

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