/// Unit tests for [QuickOpenController] — state, fuzzy ranking, recents
/// fallback, and selection wrapping (T-51).
library;

import 'package:clide/kernel/src/quick_open.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  late List<String> recents;
  QuickOpenController make() => QuickOpenController(recentPaths: () => recents);

  setUp(() => recents = ['recent_a.dart', 'recent_b.dart']);

  test('open/close/toggle track isOpen and reset the filter', () {
    final c = make();
    expect(c.isOpen, isFalse);
    c.open();
    expect(c.isOpen, isTrue);
    c.setFilter('main');
    c.close();
    expect(c.isOpen, isFalse);
    expect(c.filter, isEmpty);
    c.toggle();
    expect(c.isOpen, isTrue);
  });

  test('empty query shows recents', () {
    final c = make()..open();
    c.setFiles(['lib/main.dart', 'lib/app.dart']);
    expect(c.filtered(), recents);
    expect(c.selectedPath, 'recent_a.dart');
  });

  test('non-empty query fuzzy-matches the file list, not recents', () {
    final c = make()..open();
    c.setFiles(['lib/main.dart', 'lib/app.dart', 'README.md']);
    c.setFilter('main');
    expect(c.filtered(), contains('lib/main.dart'));
    expect(c.filtered(), isNot(contains('README.md')));
  });

  test('subsequence match ranks contiguous/early hits above scattered', () {
    final c = make()..open();
    c.setFiles(['x/abc_extra.dart', 'abc.dart', 'a_b_c.dart']);
    c.setFilter('abc');
    // 'abc.dart' (contiguous, earliest) should rank first.
    expect(c.filtered().first, 'abc.dart');
  });

  test('non-matching query yields an empty result list', () {
    final c = make()..open();
    c.setFiles(['lib/main.dart']);
    c.setFilter('zzzzz');
    expect(c.filtered(), isEmpty);
    expect(c.selectedPath, isNull);
  });

  test('selectNext/Previous wrap around the result list', () {
    final c = make()..open();
    c.setFiles(['a.dart', 'b.dart', 'c.dart']);
    c.setFilter('dart'); // matches all three
    expect(c.selectedIndex, 0);
    c.selectPrevious(); // wraps to last
    expect(c.selectedIndex, c.filtered().length - 1);
    c.selectNext(); // wraps back to 0
    expect(c.selectedIndex, 0);
  });

  test('selection is a no-op with fewer than two results', () {
    final c = make()..open();
    c.setFiles(['only.dart']);
    c.setFilter('only');
    c.selectNext();
    expect(c.selectedIndex, 0);
  });

  test('setFiles records truncation', () {
    final c = make()..open();
    c.setFiles(['a.dart'], truncated: true);
    expect(c.truncated, isTrue);
  });

  test('result list is capped at resultCap', () {
    final c = make()..open();
    c.setFiles([for (var i = 0; i < QuickOpenController.resultCap + 50; i++) 'f$i.dart']);
    c.setFilter('dart');
    expect(c.filtered(), hasLength(QuickOpenController.resultCap));
  });

  test('setLoading toggles the flag and notifies', () {
    final c = make();
    var n = 0;
    c.addListener(() => n++);
    c.setLoading(true);
    expect(c.isLoading, isTrue);
    expect(n, 1);
    c.setLoading(true); // no change → no notify
    expect(n, 1);
  });
}