Summonable.cs

// summonable entity types that are bound to a player (pet, mount, ...)
using Mirror;
using UnityEngine;

namespace uMMORPG
{
    public abstract class Summonable : Entity
    {
        [SyncVar, HideInInspector] public Player owner;

        // sync with owner's item //////////////////////////////////////////////////
        protected virtual ItemSlot SyncStateToItemSlot(ItemSlot slot)
        {
            slot.item.summonedHealth = health.current;
            slot.item.summonedLevel = level.current;

            // remove item if died?
            if (((SummonableItem)slot.item.data).removeItemIfDied && health.current == 0)
                --slot.amount;

            return slot;
        }

        // find owner item index
        // (avoid FindIndex for performance/GC)
        public int GetOwnerItemIndex()
        {
            if (owner != null)
            {
                for (int i = 0; i < owner.inventory.slots.Count; ++i)
                {
                    ItemSlot slot = owner.inventory.slots[i];
                    if (slot.amount > 0 && slot.item.summoned == netIdentity)
                        return i;
                }
            }
            return -1;
        }

        // to save computations we don't sync to it all the time, it's enough to
        // sync in:
        // * OnDestroy when unsummoning the pet
        // * On experience gain so that level ups and exp are saved properly
        // * OnDeath so that people can't cheat around reviving pets
        // => after a server crash the health/mana might not be exact, but that's a
        //    good price to pay to save computations in each Update tick
        [Server]
        public void SyncToOwnerItem()
        {
            // owner might be null if server shuts down and owner was destroyed before
            if (owner != null)
            {
                // find the item (amount might be 0 already if a mount died, etc.)
                int index = GetOwnerItemIndex();
                if (index != -1)
                    owner.inventory.slots[index] = SyncStateToItemSlot(owner.inventory.slots[index]);
            }
        }
    }
}