import 'dart:convert';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:jj_mkvmaker/core/file_ops.dart';
import 'package:jj_mkvmaker/core/models.dart';
import 'package:jj_mkvmaker/ui/quick_look.dart';
import 'package:path/path.dart' as p;

/// 81: 빠른 보기 - 글 파일은 앞 64KB (깨지면 "미리 볼 수 없음"), ← → 로 앞 · 다음, Space 로 닫기, [열기]
void main() {
  late Directory tmp;
  setUp(() => tmp = Directory.systemTemp.createTempSync('jj_ql81_'));
  tearDown(() => tmp.deleteSync(recursive: true));

  test('글 앞부분: UTF-8 · CP949 .smi · UTF-16 (BOM) .srt · UTF-8 BOM .txt 를 읽고, 글이 아니면 null · 64KB 끝에서 잘린 한 글자는 괜찮음', () async {
    final a = File(p.join(tmp.path, 'a.txt'))..writeAsStringSync('안녕 hello');
    expect(await readTextHead(a.path), '안녕 hello');
    // 81 보충 (15 지적): 한국어 자막에 흔한 CP949 · 메모장의 UTF-16 · UTF-8 BOM
    final b = File(p.join(tmp.path, 'b.smi'))..writeAsBytesSync([0xBE, 0xC8, 0xB3, 0xE7, 0x20, 0xC0, 0xDA, 0xB8, 0xB7]); // CP949 "안녕 자막"
    expect(await readTextHead(b.path), '안녕 자막');
    final u16 = <int>[0xFF, 0xFE];
    for (final r in '자막 1'.codeUnits) {
      u16.addAll([r & 0xFF, r >> 8]);
    }
    final s = File(p.join(tmp.path, 's.srt'))..writeAsBytesSync(u16);
    expect(await readTextHead(s.path), '자막 1');
    final bom = File(p.join(tmp.path, 'bom.txt'))..writeAsBytesSync([0xEF, 0xBB, 0xBF, ...utf8.encode('hi 안녕')]);
    expect(await readTextHead(bom.path), 'hi 안녕');
    final bin = File(p.join(tmp.path, 'bin.txt'))..writeAsBytesSync([0x00, 0x01, 0x02, 0x00, 0xFF]);
    expect(await readTextHead(bin.path), isNull, reason: '글이 아님');
    // 64KB 경계에 3바이트 글자가 걸리게
    final c = File(p.join(tmp.path, 'c.txt'))..writeAsStringSync('${'x' * (64 * 1024 - 1)}가나다');
    final head = await readTextHead(c.path);
    expect(head, isNotNull);
    expect(head!.length, 64 * 1024 - 1);
  });

  testWidgets('← → 로 앞 · 다음 (보이는 차례), Space 로 닫기, [열기]', (tester) async {
    tester.view.physicalSize = const Size(1000, 800);
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.reset);
    final now = DateTime(2026, 10, 17);
    final entries = [
      FileEntry(p.join(tmp.path, 'one.bin'), isDir: false, size: 10, modified: now),
      FileEntry(p.join(tmp.path, 'two.bin'), isDir: false, size: 20, modified: now),
    ];
    final opened = <String>[];
    final nav = GlobalKey<NavigatorState>();
    await tester.pumpWidget(MaterialApp(navigatorKey: nav, home: const Scaffold()));
    showDialog<void>(
      context: nav.currentContext!,
      builder: (_) => QuickLook(
        entries: entries,
        index: 0,
        probe: (_) async => const MediaInfo(streams: []),
        thumbnail: (_) async => null,
        imageExts: const ['jpg'],
        onOpen: (e) => opened.add(e.name),
      ),
    );
    await tester.pumpAndSettle();
    expect(find.text('one.bin'), findsOneWidget);
    expect(find.text('1/2'), findsOneWidget);
    await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
    await tester.pumpAndSettle();
    expect(find.text('two.bin'), findsOneWidget);
    await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
    await tester.pumpAndSettle();
    expect(find.text('2/2'), findsOneWidget, reason: '끝에서 더 가지 않음');
    await tester.tap(find.text('열기 · 재생'));
    await tester.pumpAndSettle();
    expect(opened, ['two.bin']);
    expect(find.byType(QuickLook), findsNothing);

    showDialog<void>(
      context: nav.currentContext!,
      builder: (_) => QuickLook(
        entries: entries,
        index: 1,
        probe: (_) async => const MediaInfo(streams: []),
        thumbnail: (_) async => null,
        imageExts: const ['jpg'],
        onOpen: (_) {},
      ),
    );
    await tester.pumpAndSettle();
    await tester.sendKeyEvent(LogicalKeyboardKey.space);
    await tester.pumpAndSettle();
    expect(find.byType(QuickLook), findsNothing, reason: 'Space 로 닫기');
  });
}