using System;
using System.Collections.Generic;

namespace GameStudioName
{
    [Flags]
    public enum InventoryFilters
    {
        None = 0,
        Skins = 1,
        Weapons = 2,
        Poses = 4,
        Avatars = 8,
        Emojis = 16,
        Stickers = 32
    }

    public class InventoryWatcher : SceneObject<InventoryWatcher>
    {
        private IGameDatabase database;
        private IBackendService backend;

        private List<InventoryNotifier> notifiers = new List<InventoryNotifier>();

        private void Awake()
        {
            database = Context.Resolve<IGameDatabase>();
            backend = Context.Resolve<IBackendService>();
        }
        protected override void OnEnable()
        {
            base.OnEnable();
            backend.InventoryItemsAdded += OnInventoryItemsAdded;
            backend.InventoryItemRemovedFromNew += OnInventoryItemRemovedFromNew;
        }
        protected override void OnDisable()
        {
            base.OnDisable();
            backend.InventoryItemsAdded -= OnInventoryItemsAdded;
            backend.InventoryItemRemovedFromNew -= OnInventoryItemRemovedFromNew;
        }

        private void OnInventoryItemsAdded(string[] items)
        {
            UpdateNotifiers();
        }
        private void OnInventoryItemRemovedFromNew(string itemId)
        {
            UpdateNotifiers();
        }

        public void RegisterNotifier(InventoryNotifier notifier)
        {
            notifiers.Add(notifier);
            UpdateNotifiers();
        }
        private void UpdateNotifiers()
        {
            int skinCount = 0, weaponCount = 0,
                poseCount = 0, avatarCount = 0,
                emojiCount = 0, stickerCount = 0;
            foreach (var itemId in backend.GetNewInventoryItems())
            {
                var item = database.GetItem(itemId);
                switch (item.Type)
                {
                    case ItemType.Skin:
                        skinCount++;
                        break;
                    case ItemType.Weapon:
                        weaponCount++;
                        break;
                    case ItemType.Pose:
                        poseCount++;
                        break;
                    case ItemType.Avatar:
                        avatarCount++;
                        break;
                    case ItemType.Emoji:
                        emojiCount++;
                        break;
                    case ItemType.Sticker:
                        stickerCount++;
                        break;
                }
            }

            var inventoryFilter = InventoryFilters.None;
            inventoryFilter |= skinCount > 0 ? InventoryFilters.Skins : 0;
            inventoryFilter |= weaponCount > 0 ? InventoryFilters.Weapons : 0;
            inventoryFilter |= poseCount > 0 ? InventoryFilters.Poses : 0;
            inventoryFilter |= avatarCount > 0 ? InventoryFilters.Avatars : 0;
            inventoryFilter |= emojiCount > 0 ? InventoryFilters.Emojis : 0;
            inventoryFilter |= stickerCount > 0 ? InventoryFilters.Stickers : 0;

            foreach (var notifier in notifiers)
            {
                if (notifier.Filter == InventoryFilters.None)
                    continue;
                notifier.OnNotify(notifier.Filter == inventoryFilter);
            }
        }
    }
}