import 'package:bible_tracker/data/bible.dart';
import 'package:bible_tracker/models/tracker.dart';
import 'package:bible_tracker/services/progress.dart';
import 'package:flutter_test/flutter_test.dart';

Tracker _tracker({Set<String> read = const <String>{}}) => Tracker(
  id: 't',
  name: 'Test',
  colorValue: 0xFF3F51B5,
  startDate: DateTime(2024, 1, 1),
  readChapters: read,
);

void main() {
  group('TrackerProgress', () {
    test('empty tracker has 0% overall', () {
      final progress = TrackerProgress(_tracker());
      expect(progress.overall, 0);
      expect(progress.totalRead, 0);
      expect(progress.booksCompleted(), 0);
    });

    test('counts chapters within a book', () {
      final book = Bible.books[0];
      final tracker = _tracker(
        read: <String>{
          Bible.chapterKey(book.index, 1),
          Bible.chapterKey(book.index, 2),
          Bible.chapterKey(book.index, 3),
        },
      );
      final progress = TrackerProgress(tracker);
      expect(progress.chaptersReadIn(book), 3);
      expect(progress.fractionOf(book), closeTo(3 / book.chapterCount, 1e-9));
      expect(progress.isBookStarted(book), true);
      expect(progress.isBookComplete(book), false);
    });

    test('book is complete when all chapters are read', () {
      final book = Bible.books.firstWhere((Book b) => b.name == 'Jude');
      final tracker = _tracker(
        read: <String>{
          for (int c = 1; c <= book.chapterCount; c++)
            Bible.chapterKey(book.index, c),
        },
      );
      final progress = TrackerProgress(tracker);
      expect(progress.isBookComplete(book), true);
      expect(progress.booksCompleted(), 1);
      expect(progress.booksCompleted(Testament.newT), 1);
      expect(progress.booksCompleted(Testament.old), 0);
    });

    test('overall fraction reflects all-read state', () {
      final all = <String>{
        for (final Book book in Bible.books)
          for (int c = 1; c <= book.chapterCount; c++)
            Bible.chapterKey(book.index, c),
      };
      final progress = TrackerProgress(_tracker(read: all));
      expect(progress.totalRead, Bible.totalChapters);
      expect(progress.overall, 1.0);
      expect(progress.booksCompleted(), Bible.totalBooks);
      expect(progress.testamentFraction(Testament.old), 1.0);
      expect(progress.testamentFraction(Testament.newT), 1.0);
    });
  });
}