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Refactor GildedRose: extract methods, eliminate nesting, add test coverage #2

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Refactor GildedRose: extract methods, eliminate nesting, add test coverage #2

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eb55498
Initial plan
Copilot Dec 17, 2025
c05608c
Add comprehensive test suite for all business rules
Copilot Dec 17, 2025
c6162f2
Refactor: Extract constants, simplify conditionals, and improve metho…
Copilot Dec 17, 2025
4f41134
Refactor: Convert if-elseif-else to guard clauses in updateQualityAft…
Copilot Dec 17, 2025
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152 changes: 107 additions & 45 deletions src/GildedRose.php
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,19 @@

class GildedRose
{
private const AGED_BRIE = 'Aged Brie';
private const BACKSTAGE_PASSES = 'Backstage passes to a TAFKAL80ETC concert';
private const SULFURAS = 'Sulfuras, Hand of Ragnaros';

private const MAX_QUALITY = 50;
private const MIN_QUALITY = 0;

private const QUALITY_INCREASE = 1;
private const QUALITY_DECREASE = 1;

private const BACKSTAGE_FIRST_THRESHOLD = 11;
private const BACKSTAGE_SECOND_THRESHOLD = 6;

/**
* @var Item[]
*/
Expand All @@ -20,52 +33,101 @@ public function __construct(array $items)
public function updateQuality(): void
{
foreach ($this->items as $item) {
if ($item->name != 'Aged Brie' && $item->name != 'Backstage passes to a TAFKAL80ETC concert') {
if ($item->quality > 0) {
if ($item->name != 'Sulfuras, Hand of Ragnaros') {
$item->quality = $item->quality - 1;
}
}
} else {
if ($item->quality < 50) {
$item->quality = $item->quality + 1;
if ($item->name == 'Backstage passes to a TAFKAL80ETC concert') {
if ($item->sellIn < 11) {
if ($item->quality < 50) {
$item->quality = $item->quality + 1;
}
}
if ($item->sellIn < 6) {
if ($item->quality < 50) {
$item->quality = $item->quality + 1;
}
}
}
}
}

if ($item->name != 'Sulfuras, Hand of Ragnaros') {
$item->sellIn = $item->sellIn - 1;
}

if ($item->sellIn < 0) {
if ($item->name != 'Aged Brie') {
if ($item->name != 'Backstage passes to a TAFKAL80ETC concert') {
if ($item->quality > 0) {
if ($item->name != 'Sulfuras, Hand of Ragnaros') {
$item->quality = $item->quality - 1;
}
}
} else {
$item->quality = $item->quality - $item->quality;
}
} else {
if ($item->quality < 50) {
$item->quality = $item->quality + 1;
}
}
}
$this->updateItemQuality($item);
}
}

private function updateItemQuality(Item $item): void
{
if ($this->isSulfuras($item)) {
return;
}

$this->updateQualityBeforeSellIn($item);
$this->decreaseSellIn($item);
$this->updateQualityAfterSellIn($item);
}

private function updateQualityBeforeSellIn(Item $item): void
{
if ($this->isAgedBrie($item)) {
$this->increaseQuality($item);
} elseif ($this->isBackstagePass($item)) {
$this->updateBackstagePassQuality($item);
} else {
$this->decreaseQuality($item);
}
}

private function updateQualityAfterSellIn(Item $item): void
{
if ($item->sellIn >= 0) {
return;
}

if ($this->isAgedBrie($item)) {
$this->increaseQuality($item);
return;
}

if ($this->isBackstagePass($item)) {
$this->resetQuality($item);
return;
}

$this->decreaseQuality($item);
}

private function updateBackstagePassQuality(Item $item): void
{
$this->increaseQuality($item);

if ($item->sellIn < self::BACKSTAGE_FIRST_THRESHOLD) {
$this->increaseQuality($item);
}

if ($item->sellIn < self::BACKSTAGE_SECOND_THRESHOLD) {
$this->increaseQuality($item);
}
}

private function increaseQuality(Item $item): void
{
if ($item->quality < self::MAX_QUALITY) {
$item->quality += self::QUALITY_INCREASE;
}
}

private function decreaseQuality(Item $item): void
{
if ($item->quality > self::MIN_QUALITY) {
$item->quality -= self::QUALITY_DECREASE;
}
}

private function decreaseSellIn(Item $item): void
{
$item->sellIn--;
}

private function resetQuality(Item $item): void
{
$item->quality = self::MIN_QUALITY;
}

private function isSulfuras(Item $item): bool
{
return $item->name === self::SULFURAS;
}

private function isAgedBrie(Item $item): bool
{
return $item->name === self::AGED_BRIE;
}

private function isBackstagePass(Item $item): bool
{
return $item->name === self::BACKSTAGE_PASSES;
}
}

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