namespace Guru
{
    using System;
    using UnityEngine;
    using System.Collections.Generic;
    using System.Linq;
    
    [Serializable]
    internal class GuruSDKModel
    {
        private const float SaveInterval = 3;
        private const string SaveKey = "com.guru.sdk.model.save";
        
        
        private static GuruSDKModel _instance;
        public static GuruSDKModel Instance
        {
            get
            {
                if (null == _instance) _instance = Load();
                return _instance;
            }
        }

        //-------------- data ---------------
        public string uid = "";
        public int b_level = 0;
        public int b_play = 0;
        public int buy_count = 0;
        
        public List<PurchasedProduct> purchased;
        //-------------- data ---------------

        private float _lastSavedTime = 0;
        
        public int SuccessLevelId
        {
            get
            {
                if(_successLevel == null) InitProperties();
                return _successLevel.Value;
            }
            set
            {
                if(_successLevel == null) InitProperties();
                _successLevel.Value = value;
            }
        }

        public int TotalPlayedCount
        {
            get
            {
                if(_totalPlayed == null) InitProperties();
                return _totalPlayed.Value;
            }
            set
            {
                if(_totalPlayed == null) InitProperties();
                _totalPlayed.Value = value;
            }
        }

        public int PurchasedCount
        {
            get
            {
                if(_purchasedCount == null) InitProperties();
                return _purchasedCount.Value;
            }
            set
            {
                if(_purchasedCount == null) InitProperties();
                _purchasedCount.Value = value;
            }
        }

        public string UserId
        {
            get
            {
                if(_uid == null) InitProperties();
                return _uid.Value;
            }
            set
            {
                if(_uid == null) InitProperties();
                _uid.Value = value;
            }
        }

        public bool IsIapUser => PurchasedCount > 0;
        
        
        
        private BindableProperty<int> _successLevel;
        private BindableProperty<int> _totalPlayed;
        private BindableProperty<int> _purchasedCount;
        private BindableProperty<string> _uid;
        private BindableProperty<bool> _isIapUser;
        
        public BindableProperty<int> PropBLevel => _successLevel;
        public BindableProperty<int> PropBPlay => _totalPlayed;
        public BindableProperty<int> PropBuyCount => _purchasedCount;
        public BindableProperty<string> Uid => _uid;

        #region 初始化

        
        public static GuruSDKModel Load()
        {
            GuruSDKModel model = null;
            if (PlayerPrefs.HasKey(SaveKey))
            {
                var json = PlayerPrefs.GetString(SaveKey, "");
                if (!string.IsNullOrEmpty(json))
                {
                    try
                    {
                        model =  JsonUtility.FromJson<GuruSDKModel>(json);
                    }
                    catch (Exception e)
                    {
                        UnityEngine.Debug.LogError(e);
                    }
                }
            }
            if(model == null) model = new GuruSDKModel();
            model.InitProperties();
            return model;
        }
        
        /// <summary>
        /// 保存至数据
        /// </summary>
        private void SaveToPlayerPrefs()
        {
            var json = JsonUtility.ToJson(this);
            PlayerPrefs.SetString(SaveKey, json);
        }

        public void InitProperties()
        {
            _successLevel = new BindableProperty<int>(b_level, OnLevelChanged);
            _totalPlayed = new BindableProperty<int>(b_play, OnPlayedChanged);
            _purchasedCount = new BindableProperty<int>(buy_count, OnPurchasedNumChanged);
            _uid = new BindableProperty<string>(uid, OnUidChanged);

            purchased = new List<PurchasedProduct>(20);
        }
        
        /// <summary>
        /// 保存数据
        /// </summary>
        /// <param name="force"></param>
        public void Save(bool force = false)
        {
            bool save = force || (Time.realtimeSinceStartup - _lastSavedTime>= SaveInterval);
            if (save)
            {
                _lastSavedTime = Time.realtimeSinceStartup;
                SaveToPlayerPrefs();
            }
        }


        #endregion

        #region 数据绑定变化
        private void OnLevelChanged(int value)
        {
            b_level = value;
            Save();
        }
        private void OnPlayedChanged(int value)
        {
            b_play = value;
            Save();
        }

        private void OnPurchasedNumChanged(int value)
        {
            buy_count = value;
            Save();
        }
        
        private void OnUidChanged(string value)
        {
            uid = value;
            Save();
        }
        
        #endregion

        #region 启动配置
        
        /// <summary>
        /// 从 Streaming 加载 AppServices 配置
        /// </summary>
        /// <returns></returns>
        public string LoadDefaltServicesConfigJson()
        {
            try
            {
                var txt = Resources.Load<TextAsset>(GuruSDK.ServicesConfigKey);
                return txt?.text ?? "";
            }
            catch (Exception e)
            {
                Log.Exception(e);
            }
            return "";
        }

        #endregion

        #region 订单记录


        public bool HasPurchasedProduct(string receipt)
        {
            if(purchased == null || purchased.Count == 0) return false;
            return purchased.Exists(p => p.receipt == receipt);
        }

        /// <summary>
        /// 添加已支付订单
        /// </summary>
        /// <param name="receipt"></param>
        /// <param name="productName"></param>
        /// <param name="productId"></param>
        public void AddReceipt(string receipt, string productName, string productId, bool appleProductIsRestored = false)
        {
            if (purchased == null) purchased = new List<PurchasedProduct>(20);
            if (!HasPurchasedProduct(receipt))
            {
                purchased.Add(new PurchasedProduct()
                {
                    receipt = receipt,
                    productName = productName,
                    productId = productId,
                    appleProductIsRestored = appleProductIsRestored
                });
               Save();
            }
        }

        public string[] GetReceipts(string productName)
        {
            int count = purchased?.Count ?? 0;
            if (count == 0) count = 20;
            if (purchased == null) purchased = new List<PurchasedProduct>(count);
            var receipts = new List<string>(count);
            receipts.AddRange(from purchasedProduct in purchased where purchasedProduct.productName == productName select purchasedProduct.receipt);
            return receipts.ToArray();
        }


        public string[] GetReceiptsById(string productId)
        {
            int count = purchased?.Count ?? 0;
            if (count == 0) count = 20;
            if (purchased  == null) purchased = new List<PurchasedProduct>(count);
            var receipts = new List<string>(count);
            receipts.AddRange(from purchasedProduct in purchased where purchasedProduct.productId == productId select purchasedProduct.receipt);
            return receipts.ToArray();
        }
        
        

        #endregion

    }

    [Serializable]
    internal class PurchasedProduct
    {
        public string productName;
        public string productId;
        public string receipt;
        public bool appleProductIsRestored;
    }
    






}