import 'package:flutter_test/flutter_test.dart';

import 'package:desktop_plugin/print/backend.dart';
import 'package:desktop_plugin/print/mock_backend.dart';
import 'package:desktop_plugin/server/print_queue.dart';
import 'package:desktop_plugin/server/protocol.dart';

void main() {
  group('协议 DTO', () {
    test('PrinterStatus.offline 序列化字段与前端约定对齐', () {
      final json = PrinterStatus.offline('打印机未连接').toJson();
      expect(json['online'], false);
      expect(json['status'], 0x80);
      expect(json['statusText'], '打印机未连接');
      expect((json['ribbon'] as Map)['remain'], -1);
      expect(json['cardLeft'], -1);
      expect(json['connection'], 'USB');
    });

    test('PrintRequest.fromJson 解析 front/back/copies', () {
      final req = PrintRequest.fromJson({
        'copies': 2,
        'front': {'color': 'data:image/png;base64,AAA', 'k': 'data:image/png;base64,BBB'},
        'back': {'color': 'data:image/png;base64,CCC'},
      });
      expect(req.copies, 2);
      expect(req.front!.color, 'data:image/png;base64,AAA');
      expect(req.front!.k, 'data:image/png;base64,BBB');
      expect(req.back!.color, 'data:image/png;base64,CCC');
    });
  });

  group('打印队列', () {
    test('缺少 front.color 提交即报错', () {
      final queue = PrintQueue(MockBackend());
      expect(
        () => queue.submit(PrintRequest.fromJson({'copies': 1})),
        throwsArgumentError,
      );
    });

    test('mock 任务串行走完 printing -> done', () async {
      final queue = PrintQueue(MockBackend());
      final id = queue.submit(PrintRequest.fromJson({
        'front': {'color': 'data:image/png;base64,AAA'},
      }));
      expect(id, 't1');
      expect(queue.get(id)!.state, 'printing');
      await Future<void>.delayed(const Duration(milliseconds: 2700));
      expect(queue.get(id)!.state, 'done');
    });
  });

  test('osBackendName 在 mac 上为 cups', () {
    expect(osBackendName(), anyOf('cups', 'pavo'));
  });
}