Item System

ListenersContainer
  └── ItemTemplate (Abstract)
      ├── Weapon
      ├── Armor
      └── EtcItem

WorldObject
  └── Item (Instance)

// Get item template
ItemTemplate template = ItemData.getInstance().getTemplate(57);

// Create item instance
Item item = new Item(57);
item.setCount(10000);
item.setEnchantLevel(0);

// Add item to player inventory
PlayerInventory inv = player.getInventory();
Item item = inv.addItem("Reward", 57, 10000, player, null);

// Remove items
boolean removed = inv.destroyItemByItemId("Consume", 57, 5000, player, null);

// Get item by object ID
Item item = inv.getItemByObjectId(objectId);

// Get items by item ID
List<Item> items = inv.getItemsByItemId(itemId);

// Equip weapon
Item weapon = inv.getItemByObjectId(weaponObjId);
if (weapon != null && weapon.isWeapon()) {
    inv.equipItem(weapon);
}

// Unequip armor
Item chest = inv.getPaperdollItem(Inventory.PAPERDOLL_CHEST);
if (chest != null) {
    inv.unEquipItemInBodySlot(Inventory.PAPERDOLL_CHEST);
}

// Get equipped weapon
Weapon equippedWeapon = player.getActiveWeaponItem();
if (equippedWeapon != null) {
    int pAtk = equippedWeapon.getPAtk();
}

public boolean enchantItem(Player player, Item item, Item scroll) {
    ItemTemplate template = item.getTemplate();
    
    // Check if enchantable
    if (!template.isEnchantable()) {
        player.sendMessage("This item cannot be enchanted.");
        return false;
    }
    
    // Check crystal type
    if (scroll.getCrystalType() != item.getCrystalType()) {
        player.sendMessage("Scroll grade doesn't match item grade.");
        return false;
    }
    
    // Calculate success chance
    int currentEnchant = item.getEnchantLevel();
    int successChance = calculateChance(currentEnchant);
    
    // Attempt enchant
    if (Rnd.get(100) < successChance) {
        item.setEnchantLevel(currentEnchant + 1);
        player.sendMessage("Enchant successful! +" + item.getEnchantLevel());
        return true;
    } else {
        // Enchant failed
        if (currentEnchant >= 4) {
            player.getInventory().destroyItem("Enchant Failed", item, player, null);
            player.sendMessage("Enchant failed and item was destroyed.");
        } else {
            player.sendMessage("Enchant failed.");
        }
        return false;
    }
}

// Drop item on ground
public void dropItem(Player player, Item item, int count) {
    Item drop = player.getInventory().dropItem("Drop", item, count, player, null);
    
    if (drop != null) {
        // Set drop location
        drop.setDropTime(System.currentTimeMillis());
        drop.setDropperObjectId(player.getObjectId());
        drop.dropMe(player, player.getX(), player.getY(), player.getZ());
        
        // Set drop protection
        drop.getDropProtection().protect(player);
    }
}

// Pick up item
public void pickupItem(Player player, Item item) {
    // Check distance
    if (!player.isInsideRadius3D(item, 150)) {
        player.sendMessage("Too far away.");
        return;
    }
    
    // Check drop protection
    if (!item.getDropProtection().tryPickup(player)) {
        player.sendMessage("This item is protected.");
        return;
    }
    
    // Add to inventory
    player.getInventory().addItem("Pickup", item, player, item);
    item.pickupMe(player);
}

// Check weapon skills
public void checkWeaponSkills(Player player) {
    Weapon weapon = player.getActiveWeaponItem();
    if (weapon == null) {
        return;
    }
    
    // Get weapon enchant level
    Item weaponItem = player.getActiveWeaponInstance();
    if (weaponItem != null && weaponItem.getEnchantLevel() >= 4) {
        SkillHolder skillHolder = weapon.getEnchant4Skill();
        if (skillHolder != null) {
            Skill skill = skillHolder.getSkill();
            if (player.getSkillLevel(skill.getId()) <= 0) {
                player.addSkill(skill, false);
            }
        }
    }
}

public class CustomItemHandler implements IItemHandler {
    @Override
    public boolean useItem(Playable playable, Item item, boolean forceUse) {
        if (!playable.isPlayer()) {
            return false;
        }
        
        Player player = playable.getActingPlayer();
        
        // Check item
        if (item.getId() != CUSTOM_ITEM_ID) {
            return false;
        }
        
        // Check conditions
        if (player.getLevel() < 40) {
            player.sendMessage("You must be level 40 to use this.");
            return false;
        }
        
        // Consume item
        if (!player.destroyItem("Consume", item, 1, player, true)) {
            return false;
        }
        
        // Apply effect
        player.addExpAndSp(100000, 10000);
        player.sendMessage("You gained experience!");
        
        return true;
    }
}