using System;
using System.Configuration;
using UnityEngine;

/// <summary>
/// The upgrade model differs a little from the other two. We do not care for a trade partner, only for ourselves.
/// On that note, we do use the price modifier to determine how expensive an upgrade is gonna be.
/// We do not upgrade by class, we merely improve the stats until it's no longer affordable. Self-balancing, right?
/// Still, upgrading a wooden sword to the point it's as good as a diamond sword (but 3x more expensive) technically does not make it more rare. Just impressive, really...
/// </summary>
public class UpgradeModel : ShopModel
{
    private float upgradeFactor;    // How much would an upgrade improve stats?
    public UpgradeModel(float pPriceModifier, int pItemCount, int pMoney) : base(pPriceModifier, pItemCount, pMoney)
    {

    }

    // Rather than modifying the whole class, we just reuse the existing stuff but don't make it create any items.
    // This makes it less work to make proper functionality, without having to break any potential old functionality.
    // Additionally, saves us work having to rip out the inventory's own ability to generate items.
    // Edit: Nevermind, let's just allow setting the inventory in the constructor, for shared inventories between models!
    public UpgradeModel(ShopObject pShopInitials, Inventory inventory = null) : this(pShopInitials.PriceModifier, 0, 0)
    {
        if (inventory != null) this.inventory = inventory;
        upgradeFactor = pShopInitials.UpgradeFactor;
    }

    //------------------------------------------------------------------------------------------------------------------------
    //                                                 ConfirmSelectedItem()
    //------------------------------------------------------------------------------------------------------------------------        
    //Currently it just removes the selected item from the shop's inventory, rewrite this function and don't forget the unit test.

    public override void ConfirmSelectedItem()
    {
        var item = GetSelectedItem();
        inventory.ChangeBalance(-GetPriceForItem(item));    // Expensive upgrading!
        // If no exception was thrown, we just assume we continue the upgrade!
        item.Upgrade(upgradeFactor);
        triggerTransaction();
    }

    public override void SetTradePartner(Inventory tradePartner)
    {
        //this.tradePartner = tradePartner; No need!
    }

    public override int GetPriceForItem(Item item)
    {
        return (int) (item.GetUpgradeCosts(upgradeFactor) * priceModifier);
    }
    
    // This thing triggers transaction events for each upgrade!
    private void triggerTransaction()
    {
        foreach (var observer in observers)
        {
            observer.OnTransaction(inventory.Money);
        }
    }
}