// 专项验证：cd 跨目录 + resize 后内容不重复。
import 'dart:typed_data';

import 'package:flutter/foundation.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_alacritty/flutter_alacritty.dart';
import 'package:integration_test/integration_test.dart';

import 'package:rtty_desktop/main.dart' as app;
import 'package:rtty_desktop/src/terminal_screen.dart';

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();

  testWidgets('cd 跨目录 + resize 内容完整性', (WidgetTester tester) async {
    await app.main();
    await tester.pumpAndSettle();
    await tester.tap(find.text('CONNECT'));
    await tester.pump();

    // 等待连接。
    final deadline = DateTime.now().add(const Duration(seconds: 8));
    while (DateTime.now().isBefore(deadline)) {
      await tester.pump(const Duration(milliseconds: 200));
      if (find.text('AWAITING CONNECTION').evaluate().isEmpty) break;
    }
    expect(find.text('AWAITING CONNECTION'), findsNothing);

    final engine = tester
        .state<TerminalViewState>(find.byType(TerminalView))
        .widget
        .engine;
    engine.initializeEmpty(24, 80);

    void send(String s) =>
        engine.write(Uint8List.fromList(s.codeUnits));

    String gridText() {
      final g = engine.gridForView;
      final sb = StringBuffer();
      for (var r = 0; r < g.rows; r++) {
        for (var c = 0; c < g.columns; c++) {
          final cp = g.codepointAt(r, c);
          sb.writeCharCode(cp == 0 ? 32 : cp);
        }
        sb.write('\n');
      }
      return sb.toString();
    }

    Future<bool> waitFor(bool Function(String) pred,
        {int secs = 6}) async {
      final end = DateTime.now().add(Duration(seconds: secs));
      while (DateTime.now().isBefore(end)) {
        await tester.pump(const Duration(milliseconds: 200));
        if (pred(gridText())) return true;
      }
      return pred(gridText());
    }

    // ---- 1. cd 跨目录 ----
    final target = r'C:\Users\NianJiu\rttytest\subdir';
    send('cd $target\r\n');
    final cdOk = await waitFor((t) => t.contains('rttytest\\subdir'));
    debugPrint('cd 后 prompt 含目标目录: $cdOk');
    if (!cdOk) debugPrint('--- grid ---\n${gridText()}');
    expect(cdOk, isTrue, reason: 'cd 到绝对路径后 prompt 应显示新目录');

    // ---- 2. resize 后内容不重复 ----
    // 记录 resize 前的非空行。
    send('dir\r\n');
    final beforeOk = await waitFor((t) => t.contains('subdir') && t.contains('dir'));
    debugPrint('dir 输出: $beforeOk');

    // 连续 resize 数次（模拟窗口拖动），验证内容不产生重复/错乱。
    for (final (c, r) in [(100, 30), (120, 35), (90, 28), (110, 32)]) {
      engine.resize(columns: c, rows: r);
      await tester.pump(const Duration(milliseconds: 150));
    }
    engine.resize(columns: 100, rows: 30);
    await tester.pump(const Duration(milliseconds: 300));

    // 重置引擎网格尺寸后，发送简单命令，验证仍能正常回显（无重复错乱）。
    send('echo RESIZE_OK\r\n');
    final ok = await waitFor((t) => t.contains('RESIZE_OK'));
    debugPrint('resize 后命令回显: $ok');
    expect(ok, isTrue, reason: 'resize 后命令应正常回显且无重复');

    debugPrint('--- 最终 grid ---\n${gridText()}');
  });
}