/// 相册创建/编辑表单 widget 测试（UI-03 §4 页面 09-10 重设计后）。
///
/// 覆盖：创建两分组结构（Event details / Description & languages）与默认
/// 语言必选、无 Access 页签；校验矩阵（默认语言标题缺失/未选开始时间/
/// endAt 早于 startAt）；创建 POST 载荷形状；编辑 Details/Access 页签共享
/// 草稿（切页签不丢输入）、四开关与说明、原图下载受总下载约束（禁用 +
/// PATCH 联动关断）、PATCH 最小化、endAt 显式清除、标题修改仅发全量
/// translations；未保存退出确认；保存失败保留输入。
library;

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:photo_live/core/api_client.dart';
import 'package:photo_live/core/error_codes.dart';
import 'package:photo_live/features/albums/album_form.dart';
import 'package:photo_live/features/albums/models.dart';
import 'package:photo_live/l10n/app_localizations.dart';
import 'package:photo_live/pages/album_form_page.dart';

import '../helpers/fakes.dart';

void main() {
  late FakeSessionStore store;

  setUp(() {
    store = FakeSessionStore();
  });

  ApiClient clientOf(FakeAdapter adapter) => ApiClient(
        sessionStore: store,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

  Future<void> pumpForm(
    WidgetTester tester,
    ApiClient client, {
    Album? existing,
    AlbumFormDraft? initialDraft,
  }) async {
    await tester.pumpWidget(
      ProviderScope(
        overrides: [apiClientProvider.overrideWith((ref) => client)],
        child: MaterialApp(
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: AlbumFormPage(existing: existing, initialDraft: initialDraft),
        ),
      ),
    );
    await tester.pumpAndSettle();
  }

  /// 创建模式合法草稿（测试注入开始/结束时间，避开平台日期选择器）。
  AlbumFormDraft createDraft({
    String zhTitle = '开幕晚宴',
    String enTitle = 'Opening Gala',
    String defaultLocale = 'zh-CN',
    DateTime? startAt,
    DateTime? endAt,
    bool downloadEnabled = true,
    bool originalDownloadEnabled = false,
  }) =>
      AlbumFormDraft(
        zh: AlbumTranslationDraft(locale: 'zh-CN', title: zhTitle),
        en: AlbumTranslationDraft(locale: 'en', title: enTitle),
        defaultLocale: defaultLocale,
        timezone: 'Asia/Shanghai',
        startAt: startAt ?? DateTime.utc(2026, 9, 18, 6, 30),
        endAt: endAt,
        downloadEnabled: downloadEnabled,
        originalDownloadEnabled: originalDownloadEnabled,
      );

  /// 表单长于测试视口（800x600）：按钮常在折叠线下，tap 前先滚动可见。
  Future<void> tapVisible(WidgetTester tester, Finder finder) async {
    await tester.ensureVisible(finder);
    await tester.pumpAndSettle();
    await tester.tap(finder);
  }

  /// 切到 Access 页签（编辑模式顶栏 TabBar）。
  Future<void> openAccessTab(WidgetTester tester) async {
    await tester.tap(find.text('Access'));
    await tester.pumpAndSettle();
  }

  testWidgets('页面 09 创建：两分组 + 默认语言必选 + 双语 tab + 无 Access 页签',
      (tester) async {
    final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
    await pumpForm(tester, clientOf(adapter));

    expect(find.text('Create album'), findsNWidgets(2), reason: '标题与底部按钮');
    // 两个分组标题（SectionHeader）。
    expect(find.text('Event details'), findsOneWidget);
    expect(find.text('Description & languages'), findsOneWidget);
    // 默认语言选择器（必选标记）+ 语言 tab（创建模式仅一个 TabBar）。
    expect(find.text('Default language *'), findsOneWidget);
    expect(find.byType(TabBar), findsOneWidget);
    expect(find.descendant(of: find.byType(TabBar), matching: find.text('中文')),
        findsOneWidget);
    expect(
        find.descendant(of: find.byType(TabBar), matching: find.text('English')),
        findsOneWidget);
    expect(find.byType(SegmentedButton<String>), findsOneWidget);
    // 创建模式：无 Access 页签、无开关（契约缺省）。
    expect(find.text('Access'), findsNothing);
    expect(find.byType(SwitchListTile), findsNothing);
    // 默认时区显式可见（不静默取设备时区）。
    expect(find.text('Asia/Shanghai'), findsOneWidget);
  });

  testWidgets('页面 09 创建：空表单提交 → 汇总错误（默认语言标题/开始时间），不发请求',
      (tester) async {
    final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
    await pumpForm(tester, clientOf(adapter));

    await tapVisible(tester, find.widgetWithText(FilledButton, 'Create album'));
    await tester.pump();

    expect(find.text('Default locale must have a title'), findsOneWidget);
    // 开始时间行占位与汇总错误复用同一文案 → 2 处。
    expect(find.text('Pick a start time'), findsNWidgets(2));
    expect(adapter.requests, isEmpty);
  });

  testWidgets('页面 09 创建：defaultLocale=en 而 en 标题空 → 默认语言覆盖错误',
      (tester) async {
    final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
    await pumpForm(
      tester,
      clientOf(adapter),
      initialDraft: createDraft(defaultLocale: 'en', enTitle: ''),
    );

    await tapVisible(tester, find.widgetWithText(FilledButton, 'Create album'));
    await tester.pump();

    expect(find.text('Default locale must have a title'), findsOneWidget);
    expect(adapter.requests, isEmpty);
  });

  testWidgets('页面 09 创建：endAt 早于 startAt → 时间序错误', (tester) async {
    final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
    await pumpForm(
      tester,
      clientOf(adapter),
      initialDraft: createDraft(
        endAt: DateTime.utc(2026, 9, 18, 5, 0),
      ),
    );

    await tapVisible(tester, find.widgetWithText(FilledButton, 'Create album'));
    await tester.pump();

    expect(find.text('End time must be after start time'), findsOneWidget);
    expect(adapter.requests, isEmpty);
  });

  testWidgets('页面 09 创建：合法提交 → POST 载荷形状（双语 translations/UTC 时间）',
      (tester) async {
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/albums'
          ? (201, albumJson())
          : throw StateError('unexpected ${o.path}'),
    );
    await pumpForm(
      tester,
      clientOf(adapter),
      initialDraft: createDraft(
        endAt: DateTime.utc(2026, 9, 19, 10, 0),
      ),
    );

    await tapVisible(tester, find.widgetWithText(FilledButton, 'Create album'));
    await tester.pumpAndSettle();

    final request = adapter.requests.single;
    expect(request.method, 'POST');
    expect(request.path, '/v1/albums');
    expect(request.body, <String, dynamic>{
      'translations': <Map<String, dynamic>>[
        <String, dynamic>{
          'locale': 'zh-CN',
          'title': '开幕晚宴',
          'description': null,
          'venue': null,
          'address': null,
        },
        <String, dynamic>{
          'locale': 'en',
          'title': 'Opening Gala',
          'description': null,
          'venue': null,
          'address': null,
        },
      ],
      'defaultLocale': 'zh-CN',
      'startAt': '2026-09-18T06:30:00.000Z',
      'endAt': '2026-09-19T10:00:00.000Z',
      'timezone': 'Asia/Shanghai',
      // 创建无 Access 页签：download/original 走契约缺省。
      'downloadEnabled': true,
      'originalDownloadEnabled': false,
    });
  });

  testWidgets('页面 09 创建：保存失败 → 提示并保留输入（不弹回）', (tester) async {
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/albums'
          ? (500, errorBody(ErrorCodes.internalError))
          : throw StateError('unexpected ${o.path}'),
    );
    await pumpForm(tester, clientOf(adapter), initialDraft: createDraft());

    await tapVisible(tester, find.widgetWithText(FilledButton, 'Create album'));
    await tester.pumpAndSettle();

    expect(find.byType(AlbumFormPage), findsOneWidget, reason: '失败不弹回');
    expect(
      find.text('Service temporarily unavailable. Please retry later'),
      findsOneWidget,
    );
    // 输入保留。
    expect(
      tester.widget<TextFormField>(find.byType(TextFormField).at(1)).controller!
          .text,
      '开幕晚宴',
    );
  });

  testWidgets('页面 10 编辑：Details/Access 页签 + 预填 + 无变更保存禁用',
      (tester) async {
    final adapter = FakeAdapter(
      (o) => throw StateError('编辑预加载不应发起请求：${o.path}'),
    );
    final existing = Album.fromJson(
      albumJson(
        publicEnabled: false,
        originalDownloadEnabled: true,
        endAt: '2026-09-19T10:00:00Z',
      ),
    );
    await pumpForm(tester, clientOf(adapter), existing: existing);
    adapter.requests.clear();

    // 顶栏 TabBar（Details/Access）+ 内容区语言 TabBar。
    expect(find.text('Edit album'), findsOneWidget);
    expect(find.text('Details'), findsOneWidget);
    expect(find.text('Access'), findsOneWidget);
    expect(find.byType(TabBar), findsNWidgets(2));
    expect(find.text('Save changes'), findsOneWidget);
    // 字段预填（zh tab；TextFormField 顺序 = 时区 → 标题（zh tab））。
    final titleField = tester.widget<TextFormField>(
      find.byType(TextFormField).at(1),
    );
    expect(titleField.controller!.text, '开幕晚宴');
    // 时间回显按相册时区。
    expect(find.text('2026/9/18'), findsOneWidget); // UI06：日期粒度显示
    expect(find.text('2026/9/19'), findsOneWidget); // UI06：日期粒度显示
    // 无任何变更 → 保存禁用（PATCH minProperties 1）。
    expect(
      tester.widget<FilledButton>(find.byType(FilledButton)).onPressed,
      isNull,
    );
  });

  testWidgets('页面 10 编辑：切页签共享草稿（不丢输入、不丢开关）', (tester) async {
    final adapter = FakeAdapter(
      (o) => throw StateError('不应发起请求：${o.path}'),
    );
    await pumpForm(
      tester,
      clientOf(adapter),
      existing: Album.fromJson(albumJson()),
    );
    adapter.requests.clear();
    // UI06：banner 现状预检（GET /assets）已记录——清空后断言只看用户动作。
    adapter.requests.clear();

    // Details 页签输入标题。
    await tester.enterText(find.byType(TextFormField).at(1), '闭幕演出');
    await tester.pump();
    // 切 Access → 切回 Details：输入保留（共享草稿）。
    await openAccessTab(tester);
    expect(find.byType(SwitchListTile), findsNWidgets(4));
    await tester.tap(find.text('Details'));
    await tester.pumpAndSettle();
    expect(
      tester.widget<TextFormField>(find.byType(TextFormField).at(1)).controller!
          .text,
      '闭幕演出',
    );
    // 未保存 → 不发请求。
    expect(adapter.requests, isEmpty);
  });

  testWidgets('页面 10 编辑：Access 四开关各配说明', (tester) async {
    final adapter = FakeAdapter(
      (o) => throw StateError('不应发起请求：${o.path}'),
    );
    await pumpForm(
      tester,
      clientOf(adapter),
      existing: Album.fromJson(albumJson()),
    );
    adapter.requests.clear();
    // UI06：banner 现状预检（GET /assets）已记录——清空后断言只看用户动作。
    adapter.requests.clear();

    await openAccessTab(tester);

    expect(
      find.widgetWithText(SwitchListTile, 'Allow uploads'),
      findsOneWidget,
    );
    expect(
      find.text('Allow staff to upload photos to this album'),
      findsOneWidget,
    );
    expect(
      find.widgetWithText(SwitchListTile, 'Public access'),
      findsOneWidget,
    );
    expect(
      find.text('Anyone with the link can view photos'),
      findsOneWidget,
    );
    expect(
      find.widgetWithText(SwitchListTile, 'Allow downloads'),
      findsOneWidget,
    );
    expect(
      find.text('Viewers can download browse-quality photos'),
      findsOneWidget,
    );
    expect(
      find.widgetWithText(SwitchListTile, 'Original downloads'),
      findsOneWidget,
    );
    expect(
      find.text('Viewers can download original photos'),
      findsOneWidget,
    );
    // 开关初值与原相册一致。
    expect(
      tester
          .widget<SwitchListTile>(
            find.widgetWithText(SwitchListTile, 'Allow uploads'),
          )
          .value,
      true,
    );
    expect(
      tester
          .widget<SwitchListTile>(
            find.widgetWithText(SwitchListTile, 'Public access'),
          )
          .value,
      true,
    );
  });

  testWidgets('页面 10 编辑：原图下载受总下载约束（禁用 + PATCH 联动关断）',
      (tester) async {
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/albums/alb-1'
          ? (200, albumJson(downloadEnabled: false))
          : throw StateError('unexpected ${o.path}'),
    );
    // 原相册：下载开、原图开。
    final existing =
        Album.fromJson(albumJson(originalDownloadEnabled: true));
    await pumpForm(tester, clientOf(adapter), existing: existing);
    adapter.requests.clear();

    await openAccessTab(tester);

    // 关闭总下载 → 原图开关禁用且显示为关。
    await tester.tap(find.widgetWithText(SwitchListTile, 'Allow downloads'));
    await tester.pump();
    final original = find.widgetWithText(SwitchListTile, 'Original downloads');
    expect(tester.widget<SwitchListTile>(original).onChanged, isNull,
        reason: '总下载关闭 → 原图开关禁用');
    expect(tester.widget<SwitchListTile>(original).value, isFalse,
        reason: '生效值恒为 false');

    // 保存 → PATCH 联动关断原图（不允许「原图开而下载关」的矛盾态）。
    await tester.tap(find.text('Save changes'));
    await tester.pumpAndSettle();

    expect(adapter.requests.single.body, <String, dynamic>{
      'downloadEnabled': false,
      'originalDownloadEnabled': false,
    });
  });

  testWidgets('页面 10 编辑：仅拨动 originalDownloadEnabled → PATCH 单键载荷',
      (tester) async {
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/albums/alb-1'
          ? (200, albumJson(originalDownloadEnabled: true))
          : throw StateError('unexpected ${o.path}'),
    );
    final existing = Album.fromJson(albumJson());
    await pumpForm(tester, clientOf(adapter), existing: existing);
    adapter.requests.clear();

    await openAccessTab(tester);
    await tester
        .tap(find.widgetWithText(SwitchListTile, 'Original downloads'));
    await tester.pump();

    await tester.ensureVisible(find.text('Save changes'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Save changes'));
    await tester.pumpAndSettle();

    final request = adapter.requests.single;
    expect(request.method, 'PATCH');
    expect(request.path, '/v1/albums/alb-1');
    expect(request.body, <String, dynamic>{
      'originalDownloadEnabled': true,
    });
  });

  testWidgets('页面 10 编辑：清除 endAt → PATCH 序列化 "endAt": null', (tester) async {
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/albums/alb-1'
          ? (200, albumJson(endAt: null))
          : throw StateError('unexpected ${o.path}'),
    );
    final existing = Album.fromJson(
      albumJson(endAt: '2026-09-19T10:00:00Z'),
    );
    await pumpForm(tester, clientOf(adapter), existing: existing);
    adapter.requests.clear();

    await tapVisible(tester, find.byTooltip('Clear end time'));
    await tester.pump();

    await tapVisible(tester, find.text('Save changes'));
    await tester.pumpAndSettle();

    expect(adapter.requests.single.body, <String, dynamic>{'endAt': null});
  });

  testWidgets('页面 10 编辑：修改 zh 标题 → 仅发全量 translations（不含开关/时间）',
      (tester) async {
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/albums/alb-1'
          ? (200, albumJson())
          : throw StateError('unexpected ${o.path}'),
    );
    final existing = Album.fromJson(albumJson());
    await pumpForm(tester, clientOf(adapter), existing: existing);
    adapter.requests.clear();

    await tester.enterText(
      find.byType(TextFormField).at(1),
      '闭幕演出',
    );
    await tester.pump();

    await tapVisible(tester, find.text('Save changes'));
    await tester.pumpAndSettle();

    final body = adapter.requests.single.body as Map<String, dynamic>;
    expect(body.keys, <String>['translations']);
    expect(body['translations'], <Map<String, dynamic>>[
      <String, dynamic>{
        'locale': 'zh-CN',
        'title': '闭幕演出',
        'description': null,
        'venue': '大宴会厅',
        'address': null,
      },
      <String, dynamic>{
        'locale': 'en',
        'title': 'Opening Gala',
        'description': null,
        'venue': null,
        'address': null,
      },
    ]);
  });

  testWidgets('页面 10 编辑：未保存变更退出 → 放弃确认（继续编辑/放弃两路）',
      (tester) async {
    final adapter = FakeAdapter(
      (o) => throw StateError('不应发起请求：${o.path}'),
    );
    final client = clientOf(adapter);

    /// 以父路由承载（表单作为可弹出路由，AppBar 才有返回键）。
    Future<void> pumpPushedForm() async {
      await tester.pumpWidget(
        ProviderScope(
          overrides: [apiClientProvider.overrideWith((ref) => client)],
          child: MaterialApp(
            localizationsDelegates: AppLocalizations.localizationsDelegates,
            supportedLocales: AppLocalizations.supportedLocales,
            home: Scaffold(
              body: Builder(
                builder: (context) => Center(
                  child: TextButton(
                    onPressed: () => Navigator.of(context).push(
                      MaterialPageRoute<void>(
                        builder: (_) => AlbumFormPage(
                          existing: Album.fromJson(albumJson()),
                        ),
                      ),
                    ),
                    child: const Text('open form'),
                  ),
                ),
              ),
            ),
          ),
        ),
      );
      await tester.pumpAndSettle();
      await tester.tap(find.text('open form'));
      await tester.pumpAndSettle();
    }

    await pumpPushedForm();

    // 无变更：系统返回直接弹出（无确认框）。
    await tester.pageBack();
    await tester.pumpAndSettle();
    expect(find.byType(AlbumFormPage), findsNothing);

    // 重新进入并制造变更。
    await pumpPushedForm();
    await tester.enterText(find.byType(TextFormField).at(1), '闭幕演出');
    await tester.pump();

    await tester.pageBack();
    await tester.pumpAndSettle();
    expect(find.text('Discard changes?'), findsOneWidget);
    expect(
      find.text('Your edits are not saved yet. Leaving now will discard them.'),
      findsOneWidget,
    );

    // 继续编辑 → 留在页面，输入保留。
    await tester.tap(find.text('Keep editing'));
    await tester.pumpAndSettle();
    expect(find.byType(AlbumFormPage), findsOneWidget);
    expect(
      tester.widget<TextFormField>(find.byType(TextFormField).at(1)).controller!
          .text,
      '闭幕演出',
    );

    // 放弃 → 弹出页面。
    await tester.pageBack();
    await tester.pumpAndSettle();
    await tester.tap(find.text('Discard'));
    await tester.pumpAndSettle();
    expect(find.byType(AlbumFormPage), findsNothing);
  });
}