/* Inventory.java
 * allows for storing some number of items for the player */

import java.util.ArrayList;
import java.util.Scanner;

class Inventory {
    /* the actual list of items */
    private ArrayList<Item> items;
    
    /* which item is equipped, if any */
    private Item equippedArmor;
    private Item equippedWeapon;
    
    /* the max weight limit for the player to hold */
    private int maxWeight;
    
    public Inventory(int maxWeight) {
        items = new ArrayList<Item>();
        this.maxWeight = maxWeight;
        equippedWeapon = null;
        equippedArmor = null;
    }

    /* returns true on success, false when full */
    public boolean add(Item item) {
        if ((item.getWeight() + totalWeight()) > maxWeight) {
            return false;
        } else {
            items.add(item);
            System.out.println("The " + item.getName() + " was added to your inventory.");
            return true;
        }
    }

    /* returns the total weight of all items stored */
    public int totalWeight() {
        int total = 0;
        for (Item i : items) {
            total += i.getWeight();
        }
        return total;
    }

    /* print all of the items in the list */
    public void print() {
        System.out.println(String.format("%-25s %10s %10s %10s", "Item", "Weight", "Value", "Strength"));
        for (Item i : items) {
            System.out.print(i.toString());
            if (i == equippedArmor) {
                System.out.println(" (equipped armor)");
            } else if (i == equippedWeapon) {
                System.out.println(" (equipped weapon)");
            } else {
                System.out.println();
            }
        }
    }

    /* drop an item from the inventory */
    public void drop() {
        System.out.println("Drop an item");
        Item toDrop = pickItem(null);
        if (toDrop != null) {
            items.remove(toDrop);
            System.out.println("You dropped the " + toDrop.getName());
        }
    }

    /* equip a weapon */
    public void equipWeapon() {
        System.out.println("Equip a Weapon");
        Item weapon = pickItem(ItemType.Weapon);
        if (weapon != null) {
            equippedWeapon = weapon;
            System.out.println("You equipped the " + equippedWeapon.getName());
        }
    }

    /* equip a piece of armor */
    public void equipArmor() {
        System.out.println("Equip Armor");
        Item armor = pickItem(ItemType.Armor);
        if (armor != null) {
            equippedArmor = armor;
            System.out.println("You equipped the " + equippedArmor.getName());
        }
    }

    /* a method which allows users to choose an item
     * this is private - only called by drop and equip */
    private Item pickItem(ItemType type) {
        int options = 1;
        System.out.println(String.format("   %-25s %10s %10s %10s", "Item", "Weight", "Value", "Strength"));
        for (Item i : items) {
            if (type == null || i.getType() == type) {
                System.out.println(options + ". " + i);
                options++;
            }
        }
        if (options == 1) {
            System.out.println("No appropriate items!");
            return null;
        }
        System.out.println(options + ". Cancel");
        System.out.print(": ");
        Scanner in = new Scanner(System.in);
        int choice = in. nextInt() - 1;

        // go through and skip items until we reach this one
        int realIndex = 0;
        for (Item i : items) {
            if (type == null || i.getType() == type) {
                if (choice == 0) {
                    break;
                }
                choice--;
            }
            realIndex++;
        }

        if (realIndex < 0 || realIndex >= items.size()) {
            return null;
        } else {
            return items.get(realIndex);
        }
    }
}