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/config/app_constants.dart';
import '../core/models/page_result.dart';
import '../models/inventory.dart';
import '../repositories/inventory_repository.dart';
import 'connectivity_provider.dart';

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

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

/// 全店库存 KPI 汇总（不随分页；换店/网络恢复自动刷新）。
final inventorySummaryProvider =
    FutureProvider.autoDispose<InventorySummary>((ref) {
  ref.watch(authStateProvider.select((s) => s.user?.shopId));
  ref.watch(networkRecoveryCountProvider);
  return ref.read(inventoryRepositoryProvider).getSummary();
});

class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
  int _page = 1;
  int _pageSize = AppConstants.defaultPageSize;
  int? _warehouseId;
  String _keyword = '';
  String _code = ''; // 商品编码独立筛选（原型 codeInput）
  String _status = ''; // 三态筛选（空=后端默认排除已售）
  List<String> _series = [];
  List<String> _spec = [];
  PageResult<Inventory>? _cache;

  @override
  Future<PageResult<Inventory>> build() async {
    ref.watch(authStateProvider.select((s) => s.user?.shopId));
    ref.watch(networkRecoveryCountProvider); // 网络恢复时自动刷新
    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,
          code: _code.isEmpty ? null : _code,
          status: _status.isEmpty ? null : _status,
          series: _series.isEmpty ? null : _series,
          spec: _spec.isEmpty ? null : _spec,
          page: _page,
          pageSize: _pageSize,
        );
  }

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

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

  void setWarehouseId(int? id) {
    _warehouseId = id;
    _page = 1;
    reload();
  }

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

  void setCode(String code) {
    _code = code;
    _page = 1;
    reload();
  }

  void setStatus(String status) {
    _status = status;
    _page = 1;
    reload();
  }

  void setSeries(List<String> series) {
    _series = series;
    _page = 1;
    reload();
  }

  void setSpec(List<String> spec) {
    _spec = spec;
    _page = 1;
    reload();
  }

  void reload() {
    // 保留上一次数据（isReloading）→ 屏幕渲染旧内容 + 半透明进度，不白屏。
    state = const AsyncValue<PageResult<Inventory>>.loading()
        .copyWithPrevious(state);
    _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;
  int _pageSize = AppConstants.defaultPageSize;
  PageResult<InventoryLog>? _cache;

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

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

  void setPageSize(int pageSize) {
    _pageSize = pageSize;
    _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);
      }
    });
  }
}