111 lines
2.4 KiB
Dart
111 lines
2.4 KiB
Dart
// WARNING: DO NOT modify the Item class - the goblin in the corner will insta-rage!
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class Item {
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String name;
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int sellIn;
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int quality;
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Item(this.name, this.sellIn, this.quality);
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@override
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String toString() => '$name, $sellIn, $quality';
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}
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/// Strategy pattern: Each item type has its own update behavior
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abstract class ItemUpdater {
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void update(Item item);
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}
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class NormalItemUpdater implements ItemUpdater {
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@override
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void update(Item item) {
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// Quality decreases by 1 each day
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if (item.quality > 0) {
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item.quality -= 1;
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}
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item.sellIn -= 1;
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// After sell-by date, quality degrades twice as fast
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if (item.sellIn < 0 && item.quality > 0) {
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item.quality -= 1;
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}
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}
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}
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class AgedBrieUpdater implements ItemUpdater {
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@override
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void update(Item item) {
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// Quality increases as it ages
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if (item.quality < 50) {
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item.quality += 1;
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}
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item.sellIn -= 1;
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// After sell-by date, quality increases twice as fast
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if (item.sellIn < 0 && item.quality < 50) {
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item.quality += 1;
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}
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}
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}
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class BackstagePassUpdater implements ItemUpdater {
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@override
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void update(Item item) {
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// Quality increases as concert approaches
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if (item.quality < 50) {
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item.quality += 1;
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// 10 days or less: +2 quality/day
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if (item.sellIn < 11 && item.quality < 50) {
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item.quality += 1;
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}
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// 5 days or less: +3 quality/day
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if (item.sellIn < 6 && item.quality < 50) {
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item.quality += 1;
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}
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}
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item.sellIn -= 1;
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// After concert, quality drops to 0
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if (item.sellIn < 0) {
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item.quality = 0;
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}
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}
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}
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class SulfurasUpdater implements ItemUpdater {
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@override
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void update(Item item) {
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// Legendary item never changes
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// Quality always 80, sellIn never decreases
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}
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}
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class GildedRose {
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List<Item> items;
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GildedRose(this.items);
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void updateQuality() {
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for (final item in items) {
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final updater = _selectUpdater(item);
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updater.update(item);
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}
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}
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ItemUpdater _selectUpdater(Item item) {
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if (item.name == 'Sulfuras, Hand of Ragnaros') {
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return SulfurasUpdater();
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} else if (item.name == 'Aged Brie') {
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return AgedBrieUpdater();
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} else if (item.name == 'Backstage passes to a TAFKAL80ETC concert') {
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return BackstagePassUpdater();
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} else {
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return NormalItemUpdater();
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}
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}
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}
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