Update gilded-rose.ts: fixes and refactoring

- Added logic for handling conjured items.
- Improved flow of logic in the if else statements.
- Added code comments.
- Other minor refactoring changes.

TypeScript/app/gilded-rose.ts

@@ -17,48 +17,61 @@ export class GildedRose {
     this.items = items;
   }
 
+  isItemConjured(itemName: string): boolean {
+    return itemName.startsWith("Conjured");
+  }
+
   updateQuality() {
     for (let i = 0; i < this.items.length; i++) {
-      if (this.items[i].name != 'Aged Brie' && this.items[i].name != 'Backstage passes to a TAFKAL80ETC concert') {
-        if (this.items[i].quality > 0) {
-          if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
-            this.items[i].quality = this.items[i].quality - 1
-          }
-        }
-      } else {
-        if (this.items[i].quality < 50) {
-          this.items[i].quality = this.items[i].quality + 1
+
+      // Process quality increase exceptions
+      if (this.items[i].name == 'Aged Brie' || this.items[i].name == 'Backstage passes to a TAFKAL80ETC concert') {
+        if (this.items[i].quality <= 49) {
+          this.items[i].quality++;
+          // Process additional potential quality increases for backstage passes
           if (this.items[i].name == 'Backstage passes to a TAFKAL80ETC concert') {
-            if (this.items[i].sellIn < 11) {
-              if (this.items[i].quality < 50) {
-                this.items[i].quality = this.items[i].quality + 1
-              }
+            if (this.items[i].sellIn <= 10 && this.items[i].quality <= 49) {
+              this.items[i].quality++;
             }
-            if (this.items[i].sellIn < 6) {
-              if (this.items[i].quality < 50) {
-                this.items[i].quality = this.items[i].quality + 1
-              }
+            if (this.items[i].sellIn <= 5 && this.items[i].quality <= 49) {
+              this.items[i].quality++;
             }
           }
         }
+      } else {
+        if (this.items[i].quality > 0) {
+          // Decrease quality except in certain cases
+          if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
+            this.items[i].quality = this.items[i].quality - 1;
+          }
+        }
       }
+
+      // Decrease 'sell in' value except in certain cases
       if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
-        this.items[i].sellIn = this.items[i].sellIn - 1;
+        let expiryRate = 1;
+        if(this.isItemConjured(this.items[i].name)) {
+          expiryRate = 2;
+        }
+        this.items[i].sellIn -= expiryRate;
       }
+
+      // Process additional quality change due to expiry
       if (this.items[i].sellIn < 0) {
         if (this.items[i].name != 'Aged Brie') {
           if (this.items[i].name != 'Backstage passes to a TAFKAL80ETC concert') {
             if (this.items[i].quality > 0) {
               if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
-                this.items[i].quality = this.items[i].quality - 1
+                this.items[i].quality--;
               }
             }
+          // Process some exceptional cases
           } else {
-            this.items[i].quality = this.items[i].quality - this.items[i].quality
+            this.items[i].quality = 0;
           }
         } else {
-          if (this.items[i].quality < 50) {
-            this.items[i].quality = this.items[i].quality + 1
+          if (this.items[i].quality <= 49) {
+            this.items[i].quality++;
           }
         }
       }