import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:jiu_client/core/models/page_result.dart';
import 'package:jiu_client/models/partner.dart';
import 'package:jiu_client/providers/partner_provider.dart';
import 'package:jiu_client/screens/partners/partners_screen.dart';

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

class _FakePartnerNotifier extends PartnerListNotifier {
  final AsyncValue<PageResult<Partner>> _fixed;

  _FakePartnerNotifier(String type, this._fixed) : super(type: type);

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

  @override
  void reload() {}

  @override
  void setKeyword(String keyword) {}

  @override
  void setPage(int page) {}

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

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

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

/// A notifier that stays permanently in loading state (build never completes).
class _FakeLoadingPartnerNotifier extends PartnerListNotifier {
  _FakeLoadingPartnerNotifier(String type) : super(type: type);

  @override
  Future<PageResult<Partner>> build() {
    // Never completes — keeps the widget in CircularProgressIndicator state.
    return Completer<PageResult<Partner>>().future;
  }

  @override
  void reload() {}

  @override
  void setKeyword(String keyword) {}

  @override
  void setPage(int page) {}

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

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

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

Widget _buildApp({
  AsyncValue<PageResult<Partner>> supplierState =
      const AsyncValue.data(PageResult(data: [], total: 0, page: 1, pageSize: 20)),
  AsyncValue<PageResult<Partner>> customerState =
      const AsyncValue.data(PageResult(data: [], total: 0, page: 1, pageSize: 20)),
}) {
  return ProviderScope(
    overrides: [
      supplierListProvider.overrideWith(
        () => _FakePartnerNotifier('supplier', supplierState),
      ),
      customerListProvider.overrideWith(
        () => _FakePartnerNotifier('customer', customerState),
      ),
    ],
    child: const MaterialApp(home: Scaffold(body: PartnersScreen())),
  );
}

Widget _buildLoadingApp() {
  return ProviderScope(
    overrides: [
      supplierListProvider.overrideWith(
        () => _FakeLoadingPartnerNotifier('supplier'),
      ),
      customerListProvider.overrideWith(
        () => _FakeLoadingPartnerNotifier('customer'),
      ),
    ],
    child: const MaterialApp(home: Scaffold(body: PartnersScreen())),
  );
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------
void main() {
  group('PartnersScreen - Supplier tab', () {
    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 on failure', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      await tester.pumpWidget(
        _buildApp(
          supplierState: AsyncValue.error('网络错误', 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 暂无供应商 when supplier list is empty', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

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

      expect(find.text('暂无供应商'), findsOneWidget);
    });

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

      const partners = [
        Partner(
          id: 1,
          code: 'S001',
          name: '张家酒水供应商',
          type: 'supplier',
          contact: '张三',
          phone: '13800138000',
        ),
      ];

      await tester.pumpWidget(_buildApp(
        supplierState: AsyncValue.data(
          const PageResult(data: partners, total: 1, page: 1, pageSize: 20),
        ),
      ));
      await tester.pump();

      expect(find.text('张家酒水供应商'), findsOneWidget);
      expect(find.text('张三'), findsOneWidget);
    });

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

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

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

    testWidgets('tapping 新建 opens 新建供应商 dialog', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

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

      await tester.tap(find.text('新建'));
      await tester.pumpAndSettle();

      expect(find.text('新建供应商'), findsOneWidget);
      expect(find.text('供应商名称'), findsAtLeastNWidgets(1));
    });

    testWidgets('supplier form shows 不能为空 when saving with empty name',
        (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

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

      await tester.tap(find.text('新建'));
      await tester.pumpAndSettle();

      await tester.tap(find.text('保存'));
      await tester.pump();

      expect(find.text('不能为空'), findsAtLeastNWidgets(1));
    });

    testWidgets('shows delete confirmation when delete button tapped', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const partners = [
        Partner(id: 1, name: '张家酒水供应商', type: 'supplier'),
      ];

      await tester.pumpWidget(_buildApp(
        supplierState: AsyncValue.data(
          const PageResult(data: partners, total: 1, page: 1, pageSize: 20),
        ),
      ));
      await tester.pump();

      await tester.tap(find.byKey(const Key('btn_delete_1')));
      await tester.pumpAndSettle();

      expect(find.text('确认删除'), findsOneWidget);
      expect(find.textContaining('张家酒水供应商'), findsAtLeastNWidgets(1));
      expect(find.text('取消'), findsOneWidget);
      // 删除 appears in both the list row action button and the dialog confirm button.
      expect(find.text('删除'), findsAtLeastNWidgets(1));
    });

    testWidgets('tapping edit button opens prefilled edit dialog', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const partners = [
        Partner(
          id: 1,
          code: 'S001',
          name: '张家酒水供应商',
          type: 'supplier',
          contact: '张三',
        ),
      ];

      await tester.pumpWidget(_buildApp(
        supplierState: AsyncValue.data(
          const PageResult(data: partners, total: 1, page: 1, pageSize: 20),
        ),
      ));
      await tester.pump();

      await tester.tap(find.byKey(const Key('btn_edit_1')));
      await tester.pumpAndSettle();

      expect(find.text('编辑供应商'), findsOneWidget);
      expect(find.widgetWithText(TextFormField, '张家酒水供应商'), findsOneWidget);
    });
  });

  group('PartnersScreen - Customer tab', () {
    testWidgets('shows 暂无客户 when customer list is empty', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

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

      // Switch to 客户 tab
      await tester.tap(find.text('客户'));
      await tester.pumpAndSettle();

      expect(find.text('暂无客户'), findsOneWidget);
    });

    testWidgets('shows customer names in list', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

      const customers = [
        Partner(id: 10, name: '王记饭店', type: 'customer', phone: '13900139000'),
      ];

      await tester.pumpWidget(_buildApp(
        customerState: AsyncValue.data(
          const PageResult(data: customers, total: 1, page: 1, pageSize: 20),
        ),
      ));
      await tester.pump();

      // Switch to customer tab
      await tester.tap(find.text('客户'));
      await tester.pumpAndSettle();

      expect(find.text('王记饭店'), findsOneWidget);
    });

    testWidgets('opens 新建客户 dialog from customer tab', (tester) async {
      tester.view.physicalSize = const Size(1280, 800);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);

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

      await tester.tap(find.text('客户'));
      await tester.pumpAndSettle();

      await tester.tap(find.text('新建'));
      await tester.pumpAndSettle();

      expect(find.text('新建客户'), findsOneWidget);
      expect(find.text('客户名称'), findsAtLeastNWidgets(1));
    });
  });
}