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REFACTOR: extract helper methods and domain constants

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fiatcode 2026-02-18 12:39:31 +07:00
parent 7a17790915
commit c2994ce63c
1 changed files with 30 additions and 22 deletions
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52
lib/gilded_rose.dart
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@ -11,6 +11,20 @@ class Item {
String toString() => '$name, $sellIn, $quality';
}
/// Quality bounds - domain constraints
const int _minQuality = 0;
const int _maxQuality = 50;
const int _legendaryQuality = 80; // unused, just for documentation
/// Helper methods for quality management
void _degradeQuality(Item item, int amount) {
item.quality = (item.quality - amount).clamp(_minQuality, _maxQuality);
}
void _improveQuality(Item item, int amount) {
item.quality = (item.quality + amount).clamp(_minQuality, _maxQuality);
}
/// Strategy pattern: Each item type has its own update behavior
abstract class ItemUpdater {
void update(Item item);
@ -20,15 +34,13 @@ class NormalItemUpdater implements ItemUpdater {
@override
void update(Item item) {
// Quality decreases by 1 each day
if (item.quality > 0) {
item.quality -= 1;
}
_degradeQuality(item, 1);
item.sellIn -= 1;
// After sell-by date, quality degrades twice as fast
if (item.sellIn < 0 && item.quality > 0) {
item.quality -= 1;
if (item.sellIn < 0) {
_degradeQuality(item, 1);
}
}
}
@ -37,15 +49,13 @@ class AgedBrieUpdater implements ItemUpdater {
@override
void update(Item item) {
// Quality increases as it ages
if (item.quality < 50) {
item.quality += 1;
}
_improveQuality(item, 1);
item.sellIn -= 1;
// After sell-by date, quality increases twice as fast
if (item.sellIn < 0 && item.quality < 50) {
item.quality += 1;
if (item.sellIn < 0) {
_improveQuality(item, 1);
}
}
}
@ -53,26 +63,24 @@ class AgedBrieUpdater implements ItemUpdater {
class BackstagePassUpdater implements ItemUpdater {
@override
void update(Item item) {
// Quality increases as concert approaches
if (item.quality < 50) {
item.quality += 1;
// Base quality increase
_improveQuality(item, 1);
// 10 days or less: +2 quality/day
if (item.sellIn < 11 && item.quality < 50) {
item.quality += 1;
}
// 10 days or less: +1 additional
if (item.sellIn <= 10) {
_improveQuality(item, 1);
}
// 5 days or less: +3 quality/day
if (item.sellIn < 6 && item.quality < 50) {
item.quality += 1;
}
// 5 days or less: +1 additional (total +3/day)
if (item.sellIn <= 5) {
_improveQuality(item, 1);
}
item.sellIn -= 1;
// After concert, quality drops to 0
if (item.sellIn < 0) {
item.quality = 0;
item.quality = _minQuality;
}
}
}