namespace ET.Server
{
    [FriendOf(typeof(BagComponent))]
    [FriendOf(typeof(ItemUnit))]
    public static class BagService
    {
        private static bool IsEquipItem(int itemId)
        {
            return itemId >= 10000;
        }

        public static bool TryUseItem(Player player, long itemIndex, int count, out string reason, out ItemUnit item)
        {
            reason = string.Empty;
            item = null;

            BagComponent bag = player?.GetComponent<BagComponent>();
            if (bag == null || !bag.ItemMap.TryGetValue(itemIndex, out EntityRef<ItemUnit> unitRef))
            {
                reason = "item_not_found";
                return false;
            }

            ItemUnit unit = unitRef;
            item = unit;
            if (count <= 0 || unit.Count < count)
            {
                reason = "count_invalid";
                return false;
            }

            if (unit.HeroId > 0)
            {
                reason = "equip_in_use";
                return false;
            }

            if (IsEquipItem(unit.ItemId))
            {
                reason = "equip_can_not_use";
                return false;
            }

            unit.Count -= count;
            if (unit.Count <= 0)
            {
                bag.RemoveItemByIndex(unit.ItemIndex);
                item = null;
            }
            else
            {
                BagNoticeHelper.NotifyItemChange(player, unit);
            }

            player.SetDirty();
            LogExtensions.Audit("Bag", "UseItem", $"{{\"playerId\":{player.Id},\"itemIndex\":{itemIndex},\"itemId\":{unit.ItemId},\"count\":{count}}}");
            return true;
        }
    }
}