67 lines
1.6 KiB
Dart
67 lines
1.6 KiB
Dart
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import 'dart:math';
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import 'types.dart';
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final Random _random = Random();
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List<T> shuffleList<T>(List<T> arr) {
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final a = List<T>.from(arr);
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for (int i = a.length - 1; i > 0; i--) {
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final int j = _random.nextInt(i + 1);
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final T temp = a[i];
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a[i] = a[j];
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a[j] = temp;
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}
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return a;
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}
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List<CardModel> createDeck({
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required int rows,
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required int totalCards,
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required int poolSize,
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required List<String> allFaceIds,
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}) {
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if (totalCards <= 0) {
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throw Exception('totalCards must be > 0');
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}
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if (totalCards.isOdd) {
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throw Exception('totalCards must be even');
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}
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if (allFaceIds.isEmpty) {
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throw Exception('allFaceIds must not be empty');
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}
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final pairs = totalCards ~/ 2;
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final actualPoolSize = poolSize.clamp(1, allFaceIds.length);
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final pool = shuffleList(allFaceIds).take(actualPoolSize).toList();
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if (pool.isEmpty) {
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throw Exception('pool must not be empty');
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}
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final List<String> picked = [];
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if (pool.length >= pairs) {
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picked.addAll(shuffleList(pool).take(pairs));
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} else {
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picked.addAll(pool);
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final remain = pairs - pool.length;
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for (int i = 0; i < remain; i++) {
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picked.add(pool[_random.nextInt(pool.length)]);
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}
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}
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final doubled = picked.expand((e) => [e, e]).toList();
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final shuffled = shuffleList(doubled);
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return shuffled.asMap().entries.map((entry) {
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final idx = entry.key;
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final faceId = entry.value;
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return CardModel(
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id: '$faceId-$idx-${_random.nextInt(1 << 32).toRadixString(16)}',
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faceId: faceId,
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isFlipped: false,
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isMatched: false,
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);
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}).toList();
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}
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