using System;
using IronMountain.SaveSystem;
using UnityEngine;

namespace SpellBoundAR.Items.Inventories
{
    [Serializable]
    public class SavedInventoryEntry : IInventoryEntry
    {
        public event Action OnQuantityChanged;
        public event Action OnViewsChanged;

        [Header("Cache")]
        private string _directory;
        private SavedString _itemID;
        private SavedInt _quantity;
        private SavedInt _views;
        private SavedString _timestamp;

        public string Directory => _directory;
        public string ItemTypeID => _itemID.Value;
        public IItemTypeData ItemTypeData => Database.Instance.GetItemTypeByID(_itemID.Value);

        public int Quantity
        {
            get => _quantity.Value;
            set
            {
                if (_quantity.Value == value) return;
                _quantity.Value = Mathf.Max(value, 0);
                _timestamp.Value = DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToLongTimeString();
                OnQuantityChanged?.Invoke();
            }
        }
        
        public int Views
        {
            get => _views.Value;
            set
            {
                if (_views.Value == value) return;
                _views.Value = value;
                OnViewsChanged?.Invoke();
            }
        }
        
        public DateTime Timestamp => DateTime.Parse(_timestamp.Value);

        public SavedInventoryEntry(string directory)
        {
            _directory = directory;
            _itemID = new SavedString(directory, "Item ID.txt", string.Empty, null);
            _itemID.Save();
            _quantity = new SavedInt(directory, "Quantity.txt", 0, null);
            _quantity.Save();
            _views = new SavedInt(directory, "Views.txt", 0, null);
            _views.Save();
            _timestamp = new SavedString(directory, "Timestamp.txt", DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToLongTimeString(), null);
            _timestamp.Save();
        }
        
        public SavedInventoryEntry(string directory, IInventoryEntry inventoryEntry)
        {
            _directory = directory;
            string itemID = inventoryEntry.ItemTypeData != null ? inventoryEntry.ItemTypeData.ID : string.Empty;
            _itemID = new SavedString(directory, "Item ID.txt", itemID, null);
            _itemID.Save();
            _quantity = new SavedInt(directory, "Quantity.txt", inventoryEntry.Quantity, null);
            _quantity.Save();
            _views = new SavedInt(directory, "Views.txt", inventoryEntry.Views, null);
            _views.Save();
            _timestamp = new SavedString(directory, "Timestamp.txt", inventoryEntry.Timestamp.ToShortDateString() + " " + inventoryEntry.Timestamp.ToLongTimeString(), null);
            _timestamp.Save();
        }

        public SavedInventoryEntry(string directory, IItemTypeData item, int initialQuantity, int initialViews)
        {
            _directory = directory;
            _itemID = new SavedString(directory, "Item ID.txt", item.ID, null);
            _itemID.Save();
            _quantity = new SavedInt(directory, "Quantity.txt", initialQuantity, null);
            _quantity.Save();
            _views = new SavedInt(directory, "Views.txt", initialViews, null);
            _views.Save();
            _timestamp = new SavedString(directory, "Timestamp.txt", DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToLongTimeString(), null);
            _timestamp.Save();
        }
    }
}