using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GoogleMobileAds.Api;


public class AdManager : MonoBehaviour
{
    private static AdManager _instance;
    public static AdManager Instance
    {
        get
        {
            if (_instance == null)
            {
                GameObject adManager = new GameObject("AdManager");
                _instance = adManager.AddComponent<AdManager>();
                DontDestroyOnLoad(adManager);
            }
            return _instance;
        }
    }

    private InterstitialAd _interstitialAd;
#if UNITY_ANDROID
    private string _adUnitId = "ca-app-pub-3570555734266765/3828409575";
#elif UNITY_IPHONE
    private string _adUnitId = "ca-app-pub-3570555734266765/4523825408";
#else
    private string _adUnitId = "unused";
#endif
    void Awake()
    {
        if (_instance == null)
        {
            _instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else if (_instance != this)
        {
            Destroy(gameObject);
            return;
        }

        MobileAds.Initialize(initStatus => { });
        LoadInterstitialAd();
    }

    // Update is called once per frame
    public void LoadInterstitialAd()
    {
        if (_interstitialAd != null)
        {
            _interstitialAd.Destroy();
            _interstitialAd = null;
        }
        Debug.Log("Loading the interstitial ad.");
        var adRequest = new AdRequest();
        InterstitialAd.Load(_adUnitId, adRequest, (InterstitialAd ad, LoadAdError error) => {
            if (error != null || ad == null)
            {
                Debug.LogError("Interstitial ad failed to load an ad with error : " + error);
                return;
            }
            Debug.Log("Interstitial ad loaded with response : " + ad.GetResponseInfo());
            _interstitialAd = ad;
            RegisterEventHandlers(_interstitialAd);
        });
    }

    private void RegisterEventHandlers(InterstitialAd interstitialAd)
    {
        interstitialAd.OnAdPaid += (AdValue adValue) => {
            Debug.Log(string.Format("Interstitial ad paid {0} {1}.", adValue.Value, adValue.CurrencyCode));
        };
        interstitialAd.OnAdImpressionRecorded += () => {
            Debug.Log("Interstitial ad recorded an impression.");
        };
        interstitialAd.OnAdClicked += () => {
            Debug.Log("Interstitial ad was clicked.");
        };
        interstitialAd.OnAdFullScreenContentOpened += () => {
            Debug.Log("Interstitial ad full screen content opened.");
        };
        interstitialAd.OnAdFullScreenContentClosed += () => {
            Debug.Log("Interstitial ad full screen content closed.");
            LoadInterstitialAd();
            Time.timeScale = 1f;
        };
        interstitialAd.OnAdFullScreenContentFailed += (AdError error) => {
            Debug.LogError("Interstitial ad failed to open full screen content with error : " + error);
            LoadInterstitialAd();
        };
    }

    public void ShowInterstitialAd()
    {
        if (_interstitialAd != null && _interstitialAd.CanShowAd())
        {
            Debug.Log("Showing interstitial ad.");
            _interstitialAd.Show();
        }
        else
        {
            Debug.LogError("Interstitial ad is not ready yet.");
        }
    }
}