import 'dart:io';

import 'package:flutter_test/flutter_test.dart';
import 'package:jj_mkvmaker/core/explorer/dir_loader.dart';
import 'package:jj_mkvmaker/core/explorer/pane_state.dart';
import 'package:jj_mkvmaker/core/explorer/tree_rows.dart';
import 'package:jj_mkvmaker/core/file_ops.dart';
import 'package:path/path.dart' as p;

/// E5a 약속 시험: lib/core/explorer/pane_state.dart · dir_loader.dart · tree_rows.dart 맨 위 약속.
/// 실제 시험 폴더를 읽는다 (가짜 파일 시스템 없음).
void main() {
  late Directory tmp;
  late String root, show, movies, ep1, notes;
  setUp(() {
    tmp = Directory.systemTemp.createTempSync('jj_rows_');
    root = tmp.path;
    show = p.join(root, 'Show');
    movies = p.join(root, 'Movies');
    Directory(p.join(show, 'Extras')).createSync(recursive: true);
    Directory(movies).createSync();
    ep1 = p.join(show, 'ep01.mkv');
    File(ep1).writeAsStringSync('1');
    File(p.join(show, 'ep02.mkv')).writeAsStringSync('22');
    notes = p.join(root, 'notes.txt');
    File(notes).writeAsStringSync('n');
  });
  tearDown(() => tmp.deleteSync(recursive: true));

  List<FileEntry> byName(List<FileEntry> l, String _) => sortEntries(l, SortBy.name);
  Future<void> open(PaneState pane, String dir) async {
    pane.expanded.add(dir);
    await loadDir(pane, dir, sort: byName);
  }

  List<String> names(List<TreeRow> rows) =>
      [for (final r in rows) r.kind == TreeRow.hiddenToggle ? 'hidden' : '${'  ' * r.depth}${p.basename(r.entry.path)}'];

  test('창 상태: 지금 폴더를 바꾸면 내역에 · 닫은 뒤 알리지 않음', () {
    final pane = PaneState(root);
    var n = 0;
    pane.addListener(() => n++);
    pane.current = show;
    pane.current = movies;
    expect(pane.nav.back, [root, show]);
    pane.changed();
    expect(n, 1);
    pane.dispose();
    pane.changed();
    expect(n, 1);
  });

  test('폴더 읽기: 읽음 → 정렬된 목록 · 두 번째는 읽어 둔 것 · 새로 읽기 · 읽는 동안 loading', () async {
    final pane = PaneState(root);
    final seen = <bool>[];
    pane.addListener(() => seen.add(pane.loading.contains(root)));
    expect((await loadDir(pane, root, sort: byName)).kind, 'loaded');
    expect(seen.first, isTrue, reason: '읽는 동안 loading');
    expect(pane.loading, isEmpty);
    expect([for (final e in pane.cache[root]!) p.basename(e.path)], ['Movies', 'Show', 'notes.txt']);
    expect((await loadDir(pane, root, sort: byName)).kind, 'cached');
    File(p.join(root, 'new.txt')).writeAsStringSync('x');
    var fresh = '';
    expect((await loadDir(pane, root, sort: byName, force: true, onFresh: (d) => fresh = d)).kind, 'loaded');
    expect(fresh, root);
    expect(pane.cache[root]!.length, 4);
  });

  test('폴더 읽기 오류: 이유를 남기고 빈 목록 · 보던 폴더가 지워지면 남은 상위 폴더 · OS 가 막은 폴더 · 압축 안', () async {
    final pane = PaneState(root);
    final gone = p.join(show, 'Extras');
    pane.current = gone;
    Directory(gone).deleteSync();
    final r = await loadDir(pane, gone, sort: byName);
    expect([r.kind, r.vanishedUpTo], ['vanished', show]);
    expect(pane.cache.containsKey(gone), isFalse);
    final other = p.join(root, 'nope');
    expect((await loadDir(pane, other, sort: byName)).kind, 'failed');
    expect(pane.cache[other], isEmpty);
    expect(pane.errors[other], isNotEmpty, reason: '빈 목록으로 숨기지 않음');
    expect((await loadDir(pane, movies, sort: byName, osBlocked: (_) => 'BLOCKED')).kind, 'loaded');
    expect(pane.errors[movies], 'BLOCKED', reason: '비어 보이는 막힌 폴더');
    final zip = p.join(root, 'a.zip');
    await loadDir(pane, zip, sort: byName, inside: (d, f) async => [FileEntry(p.join(zip, 'in.txt'), isDir: false, modified: DateTime(0))]);
    expect(pane.cache[zip]!.single.path, endsWith('in.txt'));
  });

  test('줄 목록: 펼친 것만 · 깊이 · 빠른 필터 (안에 맞는 것이 있으면 폴더는 남김) · 숨김 · 폴더만', () async {
    final pane = PaneState(root);
    await open(pane, root);
    await open(pane, show);
    List<TreeRow> rows({bool showHidden = false, bool foldersOnly = false}) => buildTreeRows(pane,
        foldersOnly: foldersOnly, isHidden: (x) => samePath(x, notes), showHidden: showHidden, browsable: (_) => false);
    expect(names(rows()), [p.basename(root), '  Movies', '  Show', '    Extras', '    ep01.mkv', '    ep02.mkv', 'hidden']);
    expect(rows().last.count, 1, reason: '숨긴 수');
    expect(names(rows(showHidden: true)), contains('  notes.txt'));
    // 폴더만 보기는 파일을 먼저 건너뛰어 숨긴 파일도 세지 않는다 (숨김 줄 없음)
    expect(names(rows(foldersOnly: true)), [p.basename(root), '  Movies', '  Show', '    Extras']);
    pane.current = show;
    final filtered = _Filtered(pane, 'ep02');
    expect(names(buildTreeRows(filtered, isHidden: (_) => false, browsable: (_) => false)),
        [p.basename(root), '  Movies', '  Show', '    ep02.mkv', '  notes.txt'],
        reason: '지금 폴더 (Show) 안만 거르고, 밖 (Movies) 은 그대로');
  });

  test('줄 목록: 맨 위 다른 장치 · 즐겨찾기 묶음 (펼치면 안의 것)', () async {
    final pane = PaneState(root);
    await open(pane, root);
    final rows = buildTreeRows(pane,
        roots: [r'A:\', root, r'Z:\'], favorites: [show], isHidden: (_) => false, browsable: (_) => false);
    expect([for (final r in rows) r.kind].where((k) => k == TreeRow.otherRoot).length, 2);
    expect(rows.first.entry.path, r'A:\');
    expect(rows.last.kind, TreeRow.favorites);
    pane.favoritesOpen = true;
    final open2 = buildTreeRows(pane, roots: [root], favorites: [show], isHidden: (_) => false, browsable: (_) => false);
    expect(open2.last.kind, TreeRow.favorite);
    expect(quickFilterMatch('Show.S01E02.mkv', '*.mkv'), isTrue);
    expect(globToRegExp('*.srt; ep??.mkv').hasMatch('EP01.MKV'), isTrue);
  });
}

/// 빠른 필터 글을 가진 창 (화면이 칸의 글로 덮어쓰는 것과 같게)
class _Filtered extends PaneState {
  _Filtered(PaneState from, this._f) : super(from.root) {
    expanded.addAll(from.expanded);
    cache.addAll(from.cache);
    current = from.current;
  }
  final String _f;
  @override
  String get filter => _f;
}