// Inventory System -- main (finished).
//
// Run from this folder:
//   cd projects/05-inventory/finished
//   go run .

package main

import (
	"fmt"
	"slices"

	"inventorysystem/inventory"
)

// addItem makes an item and adds it to the bag, or prints why it could not.
func addItem(bag *inventory.Inventory, name string, weight float64, value int) {
	item, err := inventory.NewItem(name, weight, value)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}
	bag.Add(item)
}

// removeItem removes an item by name, and prints what happened.
func removeItem(bag *inventory.Inventory, name string) {
	removed := bag.Remove(name)
	if removed == nil {
		fmt.Println("(no " + name + " to remove)")
		return
	}
	fmt.Println("(removed " + removed.Name() + ")")
}

// showCounts prints the count for each name, in sorted order.
func showCounts(bag *inventory.Inventory) {
	counts := bag.Counts()

	names := []string{}
	for name := range counts {
		names = append(names, name)
	}
	slices.Sort(names)

	fmt.Println("Counts:")
	for _, name := range names {
		fmt.Printf("  %s: %d\n", name, counts[name])
	}
}

func main() {
	bag := inventory.New()
	addItem(bag, "sword", 3.5, 50)
	addItem(bag, "shield", 5.0, 30)
	addItem(bag, "potion", 0.2, 5)

	bag.List()

	fmt.Println()
	removeItem(bag, "sword")
	fmt.Println()

	bag.List()

	fmt.Println()
	removeItem(bag, "lantern")
	addItem(bag, "rock", -1, 0)
	addItem(bag, "potion", 0.2, 5)
	fmt.Println()

	showCounts(bag)
}