feat(cli): implement removal logic and cli support, handles different expiry duplicates

src/pantry/core/inventory.go

@@ -21,7 +21,7 @@ type Inventory struct {
 
 func (p *Inventory) AddItem(item InventoryItem) {
 	for i, existing := range p.Items {
-		if existing.Name == item.Name {
+		if existing.Name == item.Name && existing.Expiry.Equal(*item.Expiry) {
 			p.Items[i].Quantity += item.Quantity
 			fmt.Printf("Updated %s, new quantity: %.2f %s\n", item.Name, p.Items[i].Quantity, item.Unit)
 			return
@@ -31,6 +31,65 @@ func (p *Inventory) AddItem(item InventoryItem) {
 	fmt.Printf("Added %s, quantity: %.2f %s\n", item.Name, item.Quantity, item.Unit)
 }
 
+func (p *Inventory) RemoveItem(name string, quantity float64, expiry *time.Time) {
+	for i := 0; i < len(p.Items); {
+		item := p.Items[i]
+
+		itemExpiry := "nil"
+		if item.Expiry != nil {
+			itemExpiry = item.Expiry.Format("2006-01-02")
+		}
+		inputExpiry := "nil"
+		if expiry != nil {
+			inputExpiry = expiry.Format("2006-01-02")
+		}
+
+		fmt.Printf("Checking: item.Name=%s | item.Expiry=%s\n", item.Name, itemExpiry)
+		fmt.Printf("Against: name=%s | expiry=%s\n", name, inputExpiry)
+
+		if item.Name != name {
+			i++
+			continue
+		}
+
+		if expiry != nil {
+			if item.Expiry == nil || item.Expiry.Format("2006-01-02") != expiry.Format("2006-01-02") {
+				i++
+				continue
+			}
+		} else {
+			var bestIndex = i
+			for j := i + 1; j < len(p.Items); j++ {
+				next := p.Items[j]
+				if next.Name != name {
+					continue
+				}
+				if next.Expiry == nil {
+					continue
+				}
+				if item.Expiry == nil || next.Expiry.Before(*item.Expiry) {
+					item = next
+					bestIndex = j
+				}
+			}
+			i = bestIndex
+		}
+
+		if quantity <= 0 || quantity >= item.Quantity {
+			p.Items = append(p.Items[:i], p.Items[i+1:]...)
+			fmt.Printf("Removed all of %s (expiry: %s)\n", item.Name, item.Expiry.Format("2006-01-02"))
+		} else {
+			p.Items[i].Quantity -= quantity
+			fmt.Printf("Removed %.2f %s from %s (expiry: %s)\n", quantity, item.Unit, item.Name, item.Expiry.Format("2006-01-02"))
+			i++
+		}
+
+		return
+	}
+
+	fmt.Printf("Item not found or no matching expiry.\n")
+}
+
 func (p *Inventory) ListItems() {
 	if len(p.Items) == 0 {
 		fmt.Printf("Pantry is empty\n")

src/pantry/main.go

@@ -73,6 +73,35 @@ func main() {
 			return
 		}
 
+	case "remove":
+		if len(os.Args) < 4 {
+			fmt.Println("Usage: inventory remove [name] [quantity] [expiry:YYYY-MM-DD]")
+			return
+		}
+		name := os.Args[2]
+		quantity, err := strconv.ParseFloat(os.Args[3], 64)
+		if err != nil {
+			fmt.Println("Invalid quantity")
+			return
+		}
+
+		var expiry *time.Time
+		if len(os.Args) >= 5 {
+			parsed, err := time.Parse("2006-01-02", os.Args[4])
+			if err != nil {
+				fmt.Println("Invalid expiry date format. Expected YYYY-MM-DD")
+				return
+			}
+			expiry = &parsed
+		}
+
+		inventory.RemoveItem(name, quantity, expiry)
+
+		err = core.SaveInventory(dataFile, inventory)
+		if err != nil {
+			fmt.Println("Failed to save inventory:", err)
+		}
+
 	case "list":
 		inventory.ListItems()