using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Purchasing;
using TMPro;
using UnityEngine.UI;
using DG.Tweening;
using UnityEngine.Purchasing.Extension;

[Serializable]
public class ConsumableItem
{
    public string Name;
    public string Id;
    public string desc;
    public float price;
}

[Serializable]
public class CarItem
{
    public int carId;
    public int price;
    public CarData carData;
    public Button carButton;                 // CarTile main selection
    public Image backgroundImage;
    public GameObject lockIcon;
    public Button priceButton;              // Button shown on locked cars
    public TextMeshProUGUI priceText;       // Text inside price button
}


public class ShopManager : MonoBehaviour, IDetailedStoreListener
{
    IStoreController m_StoreController;

    [Header("Consumables")]
    public List<ConsumableItem> cItem;
    public List<int> CashRewards;
    public GameObject LoadingScreen;
    public TextMeshProUGUI CashTxt;

    [Header("Car Store")]
    public List<CarItem> carItems;
    public Sprite selectedSprite;
    public Sprite unselectedSprite;

    [Header("Car Info UI")]
    public TextMeshProUGUI carNameText;
    public List<Button> colorButtons;
    public Image[] colorIndicators;
    public TextMeshProUGUI maxSpeedText;
    public TextMeshProUGUI accelerationText;
    public TextMeshProUGUI handlingText;
    public TextMeshProUGUI tractionText;
    [Header("Car Stat Bars")]
    public Image maxSpeedBar;
    public Image accelerationBar;
    public Image handlingBar;
    public Image tractionBar;

    void Start()
    {
        CashTxt.text = GameConstants.Cash.ToString();
        SetupBuilder();
        InitializeCarStore();
    }

    #region Unity IAP Setup

    void SetupBuilder()
    {
        var builder = ConfigurationBuilder.Instance(StandardPurchasingModule.Instance());

        for (int i = 0; i < cItem.Count; i++)
        {
            builder.AddProduct(cItem[i].Id, ProductType.Consumable);
        }

        UnityPurchasing.Initialize(this, builder);
    }

    public void OnInitialized(IStoreController controller, IExtensionProvider extensions)
    {
        m_StoreController = controller;
        Debug.Log("Unity IAP Initialized");
    }

    public void OnInitializeFailed(InitializationFailureReason error)
    {
        LoadingScreen.SetActive(false);
        Debug.LogError("IAP Initialization Failed: " + error);
    }

    public void OnInitializeFailed(InitializationFailureReason error, string message)
    {
        LoadingScreen.SetActive(false);
        Debug.LogError("IAP Initialization Failed: " + error + ", Message: " + message);
    }

    #endregion

    #region Purchase Flow

    public void BuyCashItem(int index)
    {
        if (index < cItem.Count)
        {
            //LoadingScreen.SetActive(true);
            //m_StoreController.InitiatePurchase(cItem[index].Id);

                    AddCash(index);
        }
    }

    public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs args)
    {
        LoadingScreen.SetActive(false);
        var productId = args.purchasedProduct.definition.id;

        for (int i = 0; i < cItem.Count; i++)
        {
            if (productId == cItem[i].Id)
            {
                AddCash(i);
                Debug.Log("Cash Item Purchased: " + cItem[i].Name);
                break;
            }
        }

        return PurchaseProcessingResult.Complete;
    }

    public void OnPurchaseFailed(Product product, PurchaseFailureReason reason)
    {
        LoadingScreen.SetActive(false);
        Debug.LogWarning("Purchase Failed: " + product.definition.id + ", Reason: " + reason);
    }

    public void OnPurchaseFailed(Product product, PurchaseFailureDescription description)
    {
        LoadingScreen.SetActive(false);
        Debug.LogWarning("Purchase Failed: " + description.message);
    }

    #endregion

    #region Cash Logic

    void AddCash(int index)
    {
        int amount = CashRewards[index];
        int currentCash = GameConstants.Cash;
        int newCash = currentCash + amount;

        GameConstants.Cash = newCash;
        StartCoroutine(AnimateCashChange(currentCash, newCash, 0.5f));
    }

    void SubtractCash(int amount)
    {
        int cash = GameConstants.Cash;
        int newCash = cash - amount;
        GameConstants.Cash = newCash;
        StartCoroutine(AnimateCashChange(cash, newCash, 0.5f));
    }

    float val;
    IEnumerator AnimateCashChange(int oldValue, int newValue, float duration)
    {
        float elapsed = 0f;
        CashTxt.transform.DOShakePosition(0.5f);

        while (elapsed < duration)
        {
            elapsed += Time.deltaTime;
            float t = elapsed / duration;
            val = Mathf.Lerp(oldValue, newValue, t);
            CashTxt.text = ((int)(val)).ToString();
            yield return null;
        }
        CashTxt.text = newValue.ToString();
    }

    #endregion

    #region Car Store Logic

    void InitializeCarStore()
    {
        int selectedIndex = GameConstants.CarSelected;

        for (int i = 0; i < carItems.Count; i++)
        {
            int index = i;
            CarItem item = carItems[i];

            bool isUnlocked = GameConstants.IsCarUnlocked(index);
            bool isSelected = (index == selectedIndex);

            // Main car tile button (selects car if unlocked)
            item.carButton.onClick.RemoveAllListeners();
            item.carButton.onClick.AddListener(() => OnCarClicked(index));

            // Price button (shown only if car is locked)
            item.priceButton.gameObject.SetActive(!isUnlocked);
            item.priceButton.onClick.RemoveAllListeners();
            item.priceButton.onClick.AddListener(() => TryBuyCar(index));
            item.priceText.text = "<sprite name=\"cash\"> $" + item.price.ToString();

            // Lock icon
            item.lockIcon.SetActive(!isUnlocked);        
            // Background sprite
            item.backgroundImage.sprite = isSelected ? selectedSprite : unselectedSprite;
        }

        UpdateCarInfo(selectedIndex);
    }

    void OnCarClicked(int index)
    {
        int selected = GameConstants.CarSelected;

        // Always show stats
        UpdateCarInfo(index);

        // Prevent selecting already selected car
        if (index == selected)
            return;

        bool isUnlocked = GameConstants.IsCarUnlocked(index);

        // Only allow changing selected car if it's unlocked
        if (isUnlocked)
        {
            SelectCar(index);
        }
        else
        {
            Debug.Log("Car is locked. Showing preview only.");
        }
    }

    void SelectCar(int index)
    {
        for (int i = 0; i < carItems.Count; i++)
        {
            bool isUnlocked = GameConstants.IsCarUnlocked(i);
            bool isSelected = (i == index);
            carItems[i].lockIcon.SetActive(!isUnlocked);

            carItems[i].backgroundImage.sprite = isSelected ? selectedSprite : unselectedSprite;
        }

        GameConstants.CarSelected = index;
        UpdateCarInfo(index);
    }

    void UpdateCarInfo(int index)
    {
        CarData data = carItems[index].carData;
        if (data == null)
        {
            Debug.LogWarning("Missing CarData for car index: " + index);
            return;
        }

        // Update Text UI
        carNameText.text = data.carName;
        maxSpeedText.text = data.maxSpeed.ToString("0");          // Optional: add if displayed
        accelerationText.text = data.acceleration.ToString("0");
        handlingText.text = data.handling.ToString("0");
        tractionText.text = data.traction.ToString("0");

        // Update fill amounts using normalized values
        accelerationBar.fillAmount = Mathf.InverseLerp(10f, 25f, data.acceleration);
        handlingBar.fillAmount = Mathf.InverseLerp(20f, 60f, data.handling);
        tractionBar.fillAmount = Mathf.InverseLerp(40f, 120f, data.traction);
        maxSpeedBar.fillAmount = Mathf.InverseLerp(150f, 275f, data.maxSpeed); // Optional

        HighlightSelectedColor(GameConstants.CarColorIndex);
    }


    void TryBuyCar(int index)
    {
        int cash = GameConstants.Cash;
        int price = carItems[index].price;

        if (cash >= price)
        {
            SubtractCash(price);
            GameConstants.UnlockCar(index);
            SelectCar(index);
            InitializeCarStore(); // Refresh visuals
        }
        else
        {
            Debug.Log("Not enough cash to buy car.");
        }
    }

    public void OnColorSelected(int colorIndex)
    {
        GameConstants.CarColorIndex = colorIndex;
        HighlightSelectedColor(colorIndex);
        Debug.Log("Color selected: " + colorIndex);
    }

    void HighlightSelectedColor(int colorIndex)
    {
        for (int i = 0; i < colorIndicators.Length; i++)
        {
            colorIndicators[i].enabled = (i == colorIndex);
        }
    }

    #endregion
}