// 唯一值得单测的东西：原生异常有没有被挡在包边界内（07 §使用规则）。

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:native_scan/native_scan.dart';
import 'package:native_scan/src/generated/scan_api.g.dart';

// pigeon 给 @HostApi 生成的是具体类（内部持有 BinaryMessenger），
// 所以这里只能 extends 覆写方法，不能 implements。
class _ThrowingApi extends ScanHostApi {
  _ThrowingApi(this.error);

  final Object error;

  @override
  Future<ScanResult> startScan(ScanOptions options) => Future<ScanResult>.error(error);

  @override
  Future<bool> isModeSupported(ScanMode mode) => Future<bool>.error(error);
}

void main() {
  final ScanOptions options = ScanOptions(mode: ScanMode.barcode);

  test('PlatformException 被转成 NativeScanException，原生类型不外泄', () async {
    final NativeScan scan = NativeScan(
      api: _ThrowingApi(PlatformException(code: 'CANCELLED', message: '用户取消')),
    );

    await expectLater(
      scan.startScan(options),
      throwsA(
        isA<NativeScanException>()
            .having((NativeScanException e) => e.code, 'code', NativeScanErrorCode.cancelled)
            .having((NativeScanException e) => e.isCancelled, 'isCancelled', isTrue),
      ),
    );
  });

  test('原生未实现时抛 UNSUPPORTED_PLATFORM，而不是静默返回', () async {
    final NativeScan scan = NativeScan(api: _ThrowingApi(MissingPluginException()));

    await expectLater(
      scan.startScan(options),
      throwsA(
        isA<NativeScanException>().having(
          (NativeScanException e) => e.code,
          'code',
          NativeScanErrorCode.unsupportedPlatform,
        ),
      ),
    );
  });

  test('isModeSupported 出错时降级为 false，调用方据此隐藏入口', () async {
    final NativeScan scan = NativeScan(api: _ThrowingApi(MissingPluginException()));

    expect(await scan.isModeSupported(ScanMode.plate), isFalse);
  });
}