using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using SUISS.Storage;

namespace SUISSEngine
{
	public abstract class StatefulSingleton<T> : Singleton<T> where T : StatefulSingleton<T>, new()
	{
		protected StatefulSingleton()
		{
			this._storage = Storage.Get(this.GetLifecycle());
			this.LoadState();
		}

		public static FieldInfo GetFieldFromHandle(RuntimeFieldHandle handle)
		{
			return FieldInfo.GetFieldFromHandle(handle);
		}

		//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
		public event StatefulSingleton<T>.ValueChangedHandler ValueChangedEvent;

		//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
		public event StatefulSingleton<T>.AnyValueChangedHandler AnyValueChangedEvent;

		public void FireValueChangedHandler(string key, object oldValue, object newValue)
		{
			if (this.ValueChangedEvent != null)
			{
				this.ValueChangedEvent(key, oldValue, newValue);
			}
			if (this.AnyValueChangedEvent != null)
			{
				this.AnyValueChangedEvent();
			}
		}

		public void FireAnyValueChangedEvent()
		{
			if (this.AnyValueChangedEvent != null)
			{
				this.AnyValueChangedEvent();
			}
		}

		public Dictionary<string, object> Persistent
		{
			get
			{
				if (this._persistentDictionary == null)
				{
					if (!this._persistent.ContainsKey("dictionary"))
					{
						this._persistent.Add("dictionary", new Dictionary<string, object>());
					}
					this._persistentDictionary = (Dictionary<string, object>)this._persistent["dictionary"];
				}
				return this._persistentDictionary;
			}
		}

		public virtual object GetValue(string key)
		{
			return this.GetValue(key, null);
		}

		public virtual object GetValue(string key, object defaultValue)
		{
			object result;
			if (!this.Persistent.TryGetValue(key, out result))
			{
				result = defaultValue;
			}
			return result;
		}

		public virtual void SetValue(string key, object value)
		{
			if (this._isNewState)
			{
				this.Persistent[key] = value;
			}
			else
			{
				object obj;
				if (!this.Persistent.TryGetValue(key, out obj))
				{
					obj = null;
				}
				if (!object.Equals(obj, value))
				{
					this.Persistent[key] = value;
					this.OnValueChanged(key, obj, value);
				}
			}
		}

		public virtual bool ContainsValue(string key)
		{
			return this.Persistent.ContainsKey(key);
		}

		protected virtual void OnValueChanged(string key, object oldValue, object newValue)
		{
			this.FireValueChangedHandler(key, oldValue, newValue);
		}

		private void LoadState()
		{
			if (this._storage.Root.ContainsKey(this.GetStorageKey()))
			{
				this._persistent = (Dictionary<string, object>)this._storage.Root[this.GetStorageKey()];
				if (!this._persistent.ContainsKey("dictionary"))
				{
					this._persistent["dictionary"] = new Dictionary<string, object>();
				}
				this._persistentDictionary = (Dictionary<string, object>)this._persistent["dictionary"];
				if (!this._persistent.ContainsKey("fields"))
				{
					this._persistent["fields"] = new Dictionary<string, object>();
				}
				this._persistentFields = (Dictionary<string, object>)this._persistent["fields"];
				this.SyncToFields();
				this._storage.OnSync += this.SyncToStorage;
			}
			else
			{
				this._persistent = new Dictionary<string, object>();
				this._persistentFields = new Dictionary<string, object>();
				this._persistent["fields"] = this._persistentFields;
				this._persistentDictionary = new Dictionary<string, object>();
				this._persistent["dictionary"] = this._persistentDictionary;
				this._storage.Root[this.GetStorageKey()] = this._persistent;
				this._storage.OnSync += this.SyncToStorage;
				this._isNewState = true;
				this.OnNewGameState();
				this._isNewState = false;
			}
		}

		protected abstract void OnNewGameState();

		protected abstract string GetStorageKey();

		protected abstract StorageLifecycle GetLifecycle();

		private void ReflectOnPersistentFields()
		{
			this._persistentFieldHandles = new List<RuntimeFieldHandle>();
			Type type = base.GetType();
			FieldInfo[] fields = type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy);
			foreach (FieldInfo fieldInfo in fields)
			{
				if (fieldInfo.IsDefined(typeof(PersistentAttribute), false))
				{
					this._persistentFieldHandles.Add(fieldInfo.GetFieldHandle());
				}
			}
		}

		private Dictionary<string, object> GetFieldsDictionary()
		{
			if (this._persistentFields == null && !this._persistent.ContainsKey("fields"))
			{
				this._persistent.Add("fields", new Dictionary<string, object>());
				this._persistentFields = (Dictionary<string, object>)this._persistent["fields"];
			}
			return this._persistentFields;
		}

		private void SyncToStorage()
		{
			if (this._persistentFieldHandles == null)
			{
				this.ReflectOnPersistentFields();
			}
			if (this._persistent != null)
			{
				Dictionary<string, object> fieldsDictionary = this.GetFieldsDictionary();
				foreach (RuntimeFieldHandle handle in this._persistentFieldHandles)
				{
					FieldInfo fieldFromHandle = StatefulSingleton<T>.GetFieldFromHandle(handle);
					fieldsDictionary[fieldFromHandle.Name] = fieldFromHandle.GetValue(this);
				}
			}
		}

		private void SyncToFields()
		{
			if (this._persistentFieldHandles == null)
			{
				this.ReflectOnPersistentFields();
			}
			if (this._persistent != null)
			{
				Dictionary<string, object> fieldsDictionary = this.GetFieldsDictionary();
				foreach (RuntimeFieldHandle handle in this._persistentFieldHandles)
				{
					FieldInfo fieldFromHandle = StatefulSingleton<T>.GetFieldFromHandle(handle);
					if (fieldsDictionary.ContainsKey(fieldFromHandle.Name))
					{
						fieldFromHandle.SetValue(this, fieldsDictionary[fieldFromHandle.Name]);
					}
				}
			}
		}

		private const string DictionaryKey = "dictionary";

		private const string FieldsKey = "fields";

		private Dictionary<string, object> _persistent;

		private Dictionary<string, object> _persistentDictionary;

		private Dictionary<string, object> _persistentFields;

		private List<RuntimeFieldHandle> _persistentFieldHandles;

		private Storage _storage;

		protected bool _isNewState;

		public delegate void ValueChangedHandler(string key, object oldValue, object newValue);

		public delegate void AnyValueChangedHandler();
	}
}