using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Threading;
using ETModel;
using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Driver;

namespace ETHotfix
{
	[ObjectSystem]
	public class DbProxyComponentSystem : AwakeSystem<DBProxyComponent>
	{
		public override void Awake(DBProxyComponent self)
		{
			self.Awake();
		}
	}
	
	/// <summary>
	/// 用来与数据库操作代理
	/// </summary>
	public static class DBProxyComponentEx
	{
		public static void Awake(this DBProxyComponent self)
		{
			StartConfig dbStartConfig = StartConfigComponent.Instance.DBConfig;
			self.dbAddress = dbStartConfig.GetComponent<InnerConfig>().IPEndPoint;
		}

		public static async ETTask Save(this DBProxyComponent self, ComponentWithId component)
		{
			Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
			await session.Call(new DBSaveRequest { Component = component });
		}

		public static async ETTask SaveBatch(this DBProxyComponent self, List<ComponentWithId> components)
		{
			Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
			await session.Call(new DBSaveBatchRequest { Components = components });
		}

		public static async ETTask Save(this DBProxyComponent self, ComponentWithId component, CancellationToken cancellationToken)
		{
			Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
			await session.Call(new DBSaveRequest { Component = component }, cancellationToken);
		}

		public static async ETVoid SaveLog(this DBProxyComponent self, ComponentWithId component)
		{
			Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
			await session.Call(new DBSaveRequest { Component = component, CollectionName = "Log" });
		}

		public static ETTask<T> Query<T>(this DBProxyComponent self, long id) where T: ComponentWithId
		{
			string key = typeof (T).Name + id;
			ETTaskCompletionSource<T> tcs = new ETTaskCompletionSource<T>();
			if (self.TcsQueue.ContainsKey(key))
			{
				self.TcsQueue.Add(key, tcs);
				return tcs.Task;
			}
			
			self.TcsQueue.Add(key, tcs);
			self.QueryInner<T>(id, key).Coroutine();
			return tcs.Task;
		}
		
		private static async ETVoid QueryInner<T>(this DBProxyComponent self, long id, string key) where T: ComponentWithId
		{
			try
			{
				Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
				DBQueryResponse dbQueryResponse = (DBQueryResponse)await session.Call(new DBQueryRequest { CollectionName = typeof(T).Name, Id = id });
				T result = (T)dbQueryResponse.Component;

				object[] tcss = self.TcsQueue.GetAll(key);
				self.TcsQueue.Remove(key);
			
				foreach (ETTaskCompletionSource<T> tcs in tcss)
				{
					tcs.SetResult(result);
				}
			}
			catch (Exception e)
			{
				object[] tcss = self.TcsQueue.GetAll(key);
				self.TcsQueue.Remove(key);
			
				foreach (ETTaskCompletionSource<T> tcs in tcss)
				{
					tcs.SetException(e);
				}
			}
		}
		
		/// <summary>
		/// 根据查询表达式查询
		/// </summary>
		/// <param name="self"></param>
		/// <param name="exp"></param>
		/// <typeparam name="T"></typeparam>
		/// <returns></returns>
		public static async ETTask<List<ComponentWithId>> Query<T>(this DBProxyComponent self, Expression<Func<T ,bool>> exp) where T: ComponentWithId
		{
			ExpressionFilterDefinition<T> filter = new ExpressionFilterDefinition<T>(exp);
			IBsonSerializerRegistry serializerRegistry = BsonSerializer.SerializerRegistry;
			IBsonSerializer<T> documentSerializer = serializerRegistry.GetSerializer<T>();
			string json = filter.Render(documentSerializer, serializerRegistry).ToJson();
			return await self.Query<T>(json);
		}

		public static async ETTask<List<ComponentWithId>> Query<T>(this DBProxyComponent self, List<long> ids) where T : ComponentWithId
		{
			Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
			DBQueryBatchResponse dbQueryBatchResponse = (DBQueryBatchResponse)await session.Call(new DBQueryBatchRequest { CollectionName = typeof(T).Name, IdList = ids });
			return dbQueryBatchResponse.Components;
		}

		/// <summary>
		/// 根据json查询条件查询
		/// </summary>
		/// <param name="self"></param>
		/// <param name="json"></param>
		/// <typeparam name="T"></typeparam>
		/// <returns></returns>
		public static ETTask<List<ComponentWithId>> Query<T>(this DBProxyComponent self, string json) where T : ComponentWithId
		{
			string key = typeof (T).Name + json;
			ETTaskCompletionSource<List<ComponentWithId>> tcs = new ETTaskCompletionSource<List<ComponentWithId>>();
			if (self.TcsQueue.ContainsKey(key))
			{
				self.TcsQueue.Add(key, tcs);
				return tcs.Task;
			}
			
			self.TcsQueue.Add(key, tcs);
			self.QueryInner<T>(json, key).Coroutine();
			return tcs.Task;
		}
		
		private static async ETVoid QueryInner<T>(this DBProxyComponent self, string json, string key) where T : ComponentWithId
		{
			try
			{
				Session session = Game.Scene.GetComponent<NetInnerComponent>().Get(self.dbAddress);
				DBQueryJsonResponse dbQueryJsonResponse = (DBQueryJsonResponse)await session.Call(new DBQueryJsonRequest { CollectionName = typeof(T).Name, Json = json });
				var result = dbQueryJsonResponse.Components;
				
				object[] tcss = self.TcsQueue.GetAll(key);
				self.TcsQueue.Remove(key);
			
				foreach (ETTaskCompletionSource<List<ComponentWithId>> tcs in tcss)
				{
					tcs.SetResult(result);
				}
			}
			catch (Exception e)
			{
				object[] tcss = self.TcsQueue.GetAll(key);
				self.TcsQueue.Remove(key);
			
				foreach (ETTaskCompletionSource<List<ComponentWithId>> tcs in tcss)
				{
					tcs.SetException(e);
				}
			}
		}
	}
}