import 'dart:io';

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:image/image.dart' as img;

import 'package:qiangbao_accounting/api/geo_api.dart';
import 'package:qiangbao_accounting/api/photo_api.dart';
import 'package:qiangbao_accounting/pages/watermark/watermark_camera_page.dart';
import 'package:qiangbao_accounting/pages/watermark/watermark_edit_page.dart';

/// 水印相机的页面布局回归测试。
///
/// 价值在之前抓过真 bug：记账首页顶部一行在 393 宽的常规手机上溢出 32px，
/// 光看代码看不出来。
///
/// 这里只断言「不溢出、不抛异常」，具体样式靠人眼验收。
///
/// 两个测试上的坑（踩过）：
///   1. 页面上的加载圈是**无限动画**，`pumpAndSettle` 永远等不到静止 → 超时。
///      所以编辑页只能手动 pump。
///   2. 读文件/解码图片是**真实异步 I/O**，得用 `tester.runAsync` 才跑得完。

/// 假定位：不发网络请求，直接返回一份完整快照
class _FakeGeoApi extends GeoApi {
  @override
  Future<GeoSnapshot> resolve() async => const GeoSnapshot(
        latitude: 25.041234,
        longitude: 102.712345,
        address: '云南省昆明市五华区莲花池正街某小区某栋某单元',
        weather: '晴',
        temperature: '25℃',
      );
}

/// 定位失败：页面仍应可用，只是少了地点那一行
class _FailingGeoApi extends GeoApi {
  @override
  Future<GeoSnapshot> resolve() async => const GeoSnapshot(error: '没有定位权限');
}

/// 假上传：立刻成功，避免测试里真的打网络
class _FakePhotoApi extends PhotoApi {
  _FakePhotoApi() : super(Dio());

  @override
  Future<int?> upload({
    required String filePath,
    double? latitude,
    double? longitude,
    String? address,
    String? weather,
    String? remark,
    DateTime? takenTime,
  }) async =>
      1;
}

void main() {
  const sizes = [
    ('iPhone SE 窄屏', Size(320, 568)),
    ('常见安卓机', Size(393, 873)),
    ('大屏', Size(480, 1000)),
  ];

  void useSize(WidgetTester tester, Size size) {
    tester.view.physicalSize = size * 3;
    tester.view.devicePixelRatio = 3.0;
    addTearDown(tester.view.reset);
  }

  /// 造一张真实的小图（编辑页要读它的文件头拿尺寸）
  File makePhoto(WidgetTester tester) {
    final dir = Directory.systemTemp.createTempSync('wm_layout_test');
    addTearDown(() {
      // Image.file 可能还占着文件句柄，删不掉就算了，别让清理把测试搞挂
      try {
        dir.deleteSync(recursive: true);
      } catch (_) {}
    });
    return File('${dir.path}/photo.png')
      ..writeAsBytesSync(img.encodePng(img.Image(width: 120, height: 90)));
  }

  /// 等真实 I/O 跑完再渲染一帧
  Future<void> settleIo(WidgetTester tester) async {
    await tester.runAsync(() async {
      await Future<void>.delayed(const Duration(milliseconds: 300));
    });
    await tester.pump();
    await tester.pump();
  }

  for (final (label, size) in sizes) {
    testWidgets('入口页 $label 不溢出', (tester) async {
      useSize(tester, size);
      await tester.pumpWidget(
        const ProviderScope(child: MaterialApp(home: WatermarkCameraPage())),
      );
      await tester.pumpAndSettle();

      expect(find.text('水印相机'), findsOneWidget);
      expect(find.text('拍照'), findsOneWidget);
      expect(find.text('从相册选'), findsOneWidget);
      expect(tester.takeException(), isNull);
    });

    testWidgets('编辑页 $label 不溢出', (tester) async {
      useSize(tester, size);
      final photo = makePhoto(tester);

      await tester.pumpWidget(
        ProviderScope(
          overrides: [
            geoApiProvider.overrideWithValue(_FakeGeoApi()),
            photoApiProvider.overrideWithValue(_FakePhotoApi()),
          ],
          child: MaterialApp(home: WatermarkEditPage(imagePath: photo.path)),
        ),
      );
      await settleIo(tester);

      expect(find.text('加水印'), findsOneWidget);
      expect(find.text('保存'), findsOneWidget);
      // 假定位的地址应该显示出来了（顺带验证异步链路是通的）
      expect(find.textContaining('昆明市'), findsOneWidget);
      expect(tester.takeException(), isNull);
    });
  }

  testWidgets('设置弹层在窄屏也不溢出', (tester) async {
    useSize(tester, const Size(320, 568));
    await tester.pumpWidget(
      const ProviderScope(child: MaterialApp(home: WatermarkCameraPage())),
    );
    await tester.pumpAndSettle();

    // 点右上角进设置
    await tester.tap(find.byIcon(Icons.tune));
    await tester.pumpAndSettle();

    expect(find.text('水印设置'), findsOneWidget);
    expect(find.text('天气温度'), findsOneWidget);
    expect(tester.takeException(), isNull);
  });

  testWidgets('定位失败时编辑页仍可用（只是少一行地点）', (tester) async {
    useSize(tester, const Size(393, 873));
    final photo = makePhoto(tester);

    await tester.pumpWidget(
      ProviderScope(
        overrides: [
          geoApiProvider.overrideWithValue(_FailingGeoApi()),
          photoApiProvider.overrideWithValue(_FakePhotoApi()),
        ],
        child: MaterialApp(home: WatermarkEditPage(imagePath: photo.path)),
      ),
    );
    await settleIo(tester);

    expect(find.textContaining('没有定位权限'), findsOneWidget);
    expect(tester.takeException(), isNull);
  });
}