import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:go_router/go_router.dart';
import 'package:jiu_client/core/models/page_result.dart';
import 'package:jiu_client/models/stock_in.dart';
import 'package:jiu_client/providers/stock_in_provider.dart';
import 'package:jiu_client/screens/stock_in/stock_in_list_screen.dart';

// ---------------------------------------------------------------------------
// Fake notifier
// ---------------------------------------------------------------------------

class _FakeStockInNotifier extends StockInListNotifier {
  final AsyncValue<PageResult<StockInOrder>> _fixed;

  _FakeStockInNotifier(this._fixed);

  @override
  Future<PageResult<StockInOrder>> build() async {
    state = _fixed;
    return state.value ??
        const PageResult(data: [], total: 0, page: 1, pageSize: 20);
  }

  @override
  void reload() {}

  @override
  void setPage(int page) {}

  @override
  void setStatus(String status) {}

  @override
  void setDateRange(String? startDate, String? endDate) {}

  @override
  Future<void> createOrder(Map<String, dynamic> data) async {}

  @override
  Future<void> submitOrder(int id) async {}

  @override
  Future<void> approveOrder(int id) async {}

  @override
  Future<void> rejectOrder(int id) async {}
}

/// A notifier that stays permanently in loading state (build never completes).
class _FakeLoadingStockInNotifier extends StockInListNotifier {
  @override
  Future<PageResult<StockInOrder>> build() {
    // Never completes — keeps the widget in CircularProgressIndicator state.
    return Completer<PageResult<StockInOrder>>().future;
  }

  @override
  void reload() {}

  @override
  void setPage(int page) {}

  @override
  void setStatus(String status) {}

  @override
  void setDateRange(String? startDate, String? endDate) {}

  @override
  Future<void> createOrder(Map<String, dynamic> data) async {}

  @override
  Future<void> submitOrder(int id) async {}

  @override
  Future<void> approveOrder(int id) async {}

  @override
  Future<void> rejectOrder(int id) async {}
}

/// Build a testable app. GoRouter is needed because the screen uses
/// `context.go('/stock-in/new')`.
Widget _buildApp(AsyncValue<PageResult<StockInOrder>> state) {
  final router = GoRouter(
    initialLocation: '/stock-in',
    routes: [
      GoRoute(
        path: '/stock-in',
        builder: (_, __) => const Scaffold(body: StockInListScreen()),
      ),
      GoRoute(
        path: '/stock-in/new',
        builder: (_, __) => const Scaffold(body: Text('new order form')),
      ),
    ],
  );

  return ProviderScope(
    overrides: [
      stockInListProvider.overrideWith(() => _FakeStockInNotifier(state)),
    ],
    child: MaterialApp.router(routerConfig: router),
  );
}

Widget _buildLoadingApp() {
  final router = GoRouter(
    initialLocation: '/stock-in',
    routes: [
      GoRoute(
        path: '/stock-in',
        builder: (_, __) => const Scaffold(body: StockInListScreen()),
      ),
      GoRoute(
        path: '/stock-in/new',
        builder: (_, __) => const Scaffold(body: Text('new order form')),
      ),
    ],
  );

  return ProviderScope(
    overrides: [
      stockInListProvider.overrideWith(() => _FakeLoadingStockInNotifier()),
    ],
    child: MaterialApp.router(routerConfig: router),
  );
}

StockInOrder _makeOrder({
  int id = 1,
  String orderNo = 'SI2024010001',
  String status = 'draft',
  String? partnerName = '张家酒水',
  String? warehouseName = '主仓库',
}) =>
    StockInOrder(
      id: id,
      orderNo: orderNo,
      warehouseId: 1,
      warehouseName: warehouseName,
      partnerName: partnerName,
      status: status,
      totalAmount: 1000.0,
      orderDate: '2024-01-10',
    );

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------
void main() {
  group('StockInListScreen', () {
    testWidgets('shows CircularProgressIndicator while loading', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      await tester.pumpWidget(_buildLoadingApp());
      await tester.pump();

      expect(find.byType(CircularProgressIndicator), findsOneWidget);
    });

    testWidgets('shows error message and retry button on failure', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      await tester.pumpWidget(
        _buildApp(AsyncValue.error('连接超时', StackTrace.empty)),
      );
      await tester.pump();

      expect(find.text('暂无数据，网络不可用'), findsOneWidget);
      expect(find.text('重试'), findsOneWidget);
    });

    testWidgets('shows 暂无入库单 when list is empty', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const empty =
          PageResult<StockInOrder>(data: [], total: 0, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(const AsyncValue.data(empty)));
      await tester.pump();

      expect(find.text('暂无入库单'), findsOneWidget);
    });

    testWidgets('shows order list with order number and supplier', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [
        _makeOrder(id: 1, orderNo: 'SI2024010001', partnerName: '张家酒水'),
        _makeOrder(id: 2, orderNo: 'SI2024010002', partnerName: '李记酒行'),
      ];

      final result =
          PageResult<StockInOrder>(data: orders, total: 2, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      // draft orders only appear in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      expect(find.text('SI2024010001'), findsOneWidget);
      expect(find.text('SI2024010002'), findsOneWidget);
      expect(find.text('张家酒水'), findsOneWidget);
      expect(find.text('李记酒行'), findsOneWidget);
    });

    testWidgets('shows 新建入库单 button in toolbar', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const empty =
          PageResult<StockInOrder>(data: [], total: 0, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(const AsyncValue.data(empty)));
      await tester.pump();

      // "新建入库审核单" button only appears in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      expect(find.text('新建入库审核单'), findsOneWidget);
    });

    testWidgets('tapping 新建入库单 navigates to new order route', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const empty =
          PageResult<StockInOrder>(data: [], total: 0, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(const AsyncValue.data(empty)));
      await tester.pump();

      // button only exists in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      await tester.tap(find.text('新建入库审核单'));
      await tester.pumpAndSettle();

      expect(find.text('new order form'), findsOneWidget);
    });

    testWidgets('draft order shows 提交 button', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [_makeOrder(id: 1, status: 'draft')];
      final result =
          PageResult<StockInOrder>(data: orders, total: 1, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      // draft orders only appear in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      expect(find.text('提交'), findsOneWidget);
    });

    testWidgets('pending order shows 通过 and 拒绝 buttons', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [_makeOrder(id: 1, status: 'pending')];
      final result =
          PageResult<StockInOrder>(data: orders, total: 1, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      // pending orders only appear in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      expect(find.byKey(const Key('btn_approve_1')), findsOneWidget);
      expect(find.byKey(const Key('btn_reject_1')), findsOneWidget);
    });

    testWidgets('approved order shows no action buttons', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [_makeOrder(id: 1, status: 'approved')];
      final result =
          PageResult<StockInOrder>(data: orders, total: 1, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      expect(find.byKey(const Key('btn_approve_1')), findsNothing);
      expect(find.byKey(const Key('btn_reject_1')), findsNothing);
      expect(find.text('提交'), findsNothing);
    });

    testWidgets('tapping approve shows confirmation dialog', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [
        _makeOrder(id: 1, status: 'pending', orderNo: 'SI2024010001')
      ];
      final result =
          PageResult<StockInOrder>(data: orders, total: 1, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      // pending orders only appear in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      await tester.tap(find.byKey(const Key('btn_approve_1')));
      await tester.pumpAndSettle();

      expect(find.text('审核确认'), findsOneWidget);
      expect(find.textContaining('SI2024010001'), findsAtLeastNWidgets(1));
      expect(find.text('通过'), findsAtLeastNWidgets(1));
    });

    testWidgets('tapping reject shows confirmation dialog', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [
        _makeOrder(id: 1, status: 'pending', orderNo: 'SI2024010001')
      ];
      final result =
          PageResult<StockInOrder>(data: orders, total: 1, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      // pending orders only appear in the "入库审核" tab (index 1)
      await tester.tap(find.text('入库审核'));
      await tester.pumpAndSettle();

      await tester.tap(find.byKey(const Key('btn_reject_1')));
      await tester.pumpAndSettle();

      expect(find.text('拒绝确认'), findsOneWidget);
      expect(find.textContaining('SI2024010001'), findsAtLeastNWidgets(1));
      expect(find.text('拒绝'), findsAtLeastNWidgets(1));
    });

    testWidgets('shows status filter dropdown in first tab toolbar', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const empty =
          PageResult<StockInOrder>(data: [], total: 0, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(const AsyncValue.data(empty)));
      await tester.pump();

      await tester.tap(find.text('入库单'));
      await tester.pumpAndSettle();

      expect(find.text('全部状态'), findsOneWidget);
    });

    testWidgets('shows total record count in pagination bar', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      final orders = [_makeOrder(id: 1)];
      final result =
          PageResult<StockInOrder>(data: orders, total: 35, page: 1, pageSize: 20);

      await tester.pumpWidget(_buildApp(AsyncValue.data(result)));
      await tester.pump();

      expect(find.textContaining('共 35 条记录'), findsOneWidget);
    });
  });
}