using PlayFab;
using PlayFab.ClientModels;
using PlayFab.Json;
using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Purchasing;

public class AndroidIAPExample : MonoBehaviour, IStoreListener {
    // Items list, configurable via inspector
    private List<CatalogItem> Catalog;

    // The Unity Purchasing system
    private static IStoreController m_StoreController;

    // Bootstrap the whole thing
    public void Start() {
        // Make PlayFab log in
        Login();
    }

    public void OnGUI() {
        // This line just scales the UI up for high-res devices
        // Comment it out if you find the UI too large.
        GUI.matrix = Matrix4x4.TRS(new Vector3(0, 0, 0), Quaternion.identity, new Vector3(3, 3, 3));

        // if we are not initialized, only draw a message
        if (!IsInitialized) {
            GUILayout.Label("Initializing IAP and logging in...");
            return;
        }

        // Draw menu to purchase items
        foreach (var item in Catalog) {
            if (GUILayout.Button("Buy " + item.DisplayName)) {
                // On button click buy a product
                BuyProductID(item.ItemId);
            }
        }
    }

    // This is invoked manually on Start to initiate login ops
    private void Login() {
        // Login with Android ID
        PlayFabClientAPI.LoginWithAndroidDeviceID(new LoginWithAndroidDeviceIDRequest() {
            CreateAccount = true,
            AndroidDeviceId = SystemInfo.deviceUniqueIdentifier
        }, result => {
            Debug.Log("Logged in");
            // Refresh available items
            RefreshIAPItems();
        }, error => Debug.LogError(error.GenerateErrorReport()));
    }

    private void RefreshIAPItems() {
        PlayFabClientAPI.GetCatalogItems(new GetCatalogItemsRequest(), result => {
            Catalog = result.Catalog;

            // Make UnityIAP initialize
            InitializePurchasing();
        }, error => Debug.LogError(error.GenerateErrorReport()));
    }

    // This is invoked manually on Start to initialize UnityIAP
    public void InitializePurchasing() {
        // If IAP is already initialized, return gently
        if (IsInitialized) return;

        // Create a builder for IAP service
        var builder = ConfigurationBuilder.Instance(StandardPurchasingModule.Instance(AppStore.GooglePlay));

        // Register each item from the catalog
        foreach (var item in Catalog) {
            builder.AddProduct(item.ItemId, ProductType.Consumable);
        }

        // Trigger IAP service initialization
        UnityPurchasing.Initialize(this, builder);
    }

    // We are initialized when StoreController and Extensions are set and we are logged in
    public bool IsInitialized {
        get {
            return m_StoreController != null && Catalog != null;
        }
    }

    // This is automatically invoked automatically when IAP service is initialized
    public void OnInitialized(IStoreController controller, IExtensionProvider extensions) {
        m_StoreController = controller;
    }

    // This is automatically invoked automatically when IAP service failed to initialized
    public void OnInitializeFailed(InitializationFailureReason error) {
        Debug.Log("OnInitializeFailed InitializationFailureReason:" + error);
    }

    // This is automatically invoked automatically when purchase failed
    public void OnPurchaseFailed(Product product, PurchaseFailureReason failureReason) {
        Debug.Log(string.Format("OnPurchaseFailed: FAIL. Product: '{0}', PurchaseFailureReason: {1}", product.definition.storeSpecificId, failureReason));
    }

    // This is invoked automatically when successful purchase is ready to be processed
    public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e) {
        // NOTE: this code does not account for purchases that were pending and are
        // delivered on application start.
        // Production code should account for such case:
        // More: https://docs.unity3d.com/ScriptReference/Purchasing.PurchaseProcessingResult.Pending.html

        if (!IsInitialized) {
            return PurchaseProcessingResult.Complete;
        }

        // Test edge case where product is unknown
        if (e.purchasedProduct == null) {
            Debug.LogWarning("Attempted to process purchase with unknown product. Ignoring");
            return PurchaseProcessingResult.Complete;
        }

        // Test edge case where purchase has no receipt
        if (string.IsNullOrEmpty(e.purchasedProduct.receipt)) {
            Debug.LogWarning("Attempted to process purchase with no receipt: ignoring");
            return PurchaseProcessingResult.Complete;
        }

        Debug.Log("Processing transaction: " + e.purchasedProduct.transactionID);

        // Deserialize receipt
        var googleReceipt = GooglePurchase.FromJson(e.purchasedProduct.receipt);

        // Invoke receipt validation
        // This will not only validate a receipt, but will also grant player corresponding items
        // only if receipt is valid.
        PlayFabClientAPI.ValidateGooglePlayPurchase(new ValidateGooglePlayPurchaseRequest() {
            // Pass in currency code in ISO format
            CurrencyCode = e.purchasedProduct.metadata.isoCurrencyCode,
            // Convert and set Purchase price
            PurchasePrice = (uint)(e.purchasedProduct.metadata.localizedPrice * 100),
            // Pass in the receipt
            ReceiptJson = googleReceipt.PayloadData.json,
            // Pass in the signature
            Signature = googleReceipt.PayloadData.signature
        }, result => Debug.Log("Validation successful!"),
           error => Debug.Log("Validation failed: " + error.GenerateErrorReport())
        );

        return PurchaseProcessingResult.Complete;
    }

    // This is invoked manually to initiate purchase
    void BuyProductID(string productId) {
        // If IAP service has not been initialized, fail hard
        if (!IsInitialized) throw new Exception("IAP Service is not initialized!");

        // Pass in the product id to initiate purchase
        m_StoreController.InitiatePurchase(productId);
    }
}

// The following classes are used to deserialize JSON results provided by IAP Service
// Please, note that JSON fields are case-sensitive and should remain fields to support Unity Deserialization via JsonUtilities
public class JsonData {
    // JSON Fields, ! Case-sensitive

    public string orderId;
    public string packageName;
    public string productId;
    public long purchaseTime;
    public int purchaseState;
    public string purchaseToken;
}

public class PayloadData {
    public JsonData JsonData;

    // JSON Fields, ! Case-sensitive
    public string signature;
    public string json;

    public static PayloadData FromJson(string json) {
        var payload = JsonUtility.FromJson<PayloadData>(json);
        payload.JsonData = JsonUtility.FromJson<JsonData>(payload.json);
        return payload;
    }
}

public class GooglePurchase {
    public PayloadData PayloadData;

    // JSON Fields, ! Case-sensitive
    public string Store;
    public string TransactionID;
    public string Payload;

    public static GooglePurchase FromJson(string json) {
        var purchase = JsonUtility.FromJson<GooglePurchase>(json);
        purchase.PayloadData = PayloadData.FromJson(purchase.Payload);
        return purchase;
    }
}