using Amazon.Runtime.Internal;
using Business.Core.Attributes;
using Microsoft.Extensions.Options;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;
using MongoDB.Driver;
using MongoDB.Driver.Linq;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Volo.Abp.Domain.Entities;
using Volo.Abp.Domain.Repositories;

namespace Business.Core.MongoDBHelper
{
    /// <summary>
    /// MongoDB帮助类
    /// </summary>
    public class MongoDBTools<T> : IMongoDB<T> 
    {
        public readonly IMongoCollection<T> mongoCollection;
        public readonly IMongoDatabase dataBase;
        public IOptionsSnapshot<Config> _config;
        public CollectionNameAttribute collectonName;

        /// <summary>
        /// MongoDB链接
        /// </summary>
        /// <param name="config"></param>
        /// <exception cref="NotImplementedException"></exception>
        public MongoDBTools(IOptionsSnapshot<Config> config)
        {
            _config = config;
            
            collectonName = typeof(T).GetCustomAttributes(typeof(CollectionNameAttribute), true).FirstOrDefault() as CollectionNameAttribute;
            if (collectonName == null)
            {
                throw new NotImplementedException("请配置Attribute属性！");
            }
            //数据库链接
            MongoClient client = new MongoClient(config.Value.connectstring + collectonName.DatabaseName);
            //数据库
            dataBase = client.GetDatabase(collectonName.DatabaseName);
            //表名
            mongoCollection = dataBase.GetCollection<T>(collectonName.CollectionName);
        }

        /// <summary>
        /// 插入一条数据
        /// </summary>
        /// <param name="document"></param>
        /// <returns></returns>
        public Task InsertOne(T document)
        {
            return mongoCollection.InsertOneAsync(document);
        }

        /// <summary>
        /// 插入多条数据
        /// </summary>
        /// <param name="documents"></param>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public Task InsertMany(List<T> documents)
        {
           return mongoCollection.InsertManyAsync(documents,new InsertManyOptions() { IsOrdered = false});
        }

        /// <summary>
        /// 获取所有数据
        /// </summary>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public Task<List<T>> GetAll()
        {
            return mongoCollection.AsQueryable<T>().ToListAsync();
        }

        /// <summary>
        /// 根据条件获取数据
        /// </summary>
        /// <returns></returns>
        public Task<List<T>> GetManyByCondition(Expression<Func<T, bool>> filter) 
        {
            return mongoCollection.Find(filter).ToListAsync();
        }

        /// <summary>
        /// 根据条件获取数据
        /// </summary>
        /// <returns></returns>
        public Task<List<T>> GetManyByIds(FilterDefinition<T> filter)
        {
            return mongoCollection.Find(filter).ToListAsync();
        }

        /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="expression"></param>
        /// <param name="isOne"></param>
        /// <returns></returns>
        public Task<DeleteResult> Delete(Expression<Func<T, bool>> expression, bool isOne = false)
        {
            if (isOne)
                return mongoCollection.DeleteOneAsync(expression);
            else
                return mongoCollection.DeleteManyAsync(expression);
        }

        /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="filter"></param>
        /// <param name="isOne"></param>
        /// <returns></returns>
        public Task<DeleteResult> Delete(FilterDefinition<T> filter, bool isOne = false)
        {
            if (isOne)
                return mongoCollection.DeleteOneAsync(filter);
            else
                return mongoCollection.DeleteManyAsync(filter);
        }

        /// <summary>
        /// 根据条件获取结果列表
        /// </summary>
        /// <param name="expression">条件Expression</param>
        /// <returns>结果列表</returns>
        public Task<List<T>> Find(Expression<Func<T,bool>> expression, ProjectionDefinition<T, T> projecter = null, SortDefinition<T> sorter = null)
        {
            //Include表示包含那些字段
            //ProjectionDefinitionBuilder<VoucherTemplate> project = new ProjectionDefinitionBuilder<VoucherTemplate>();
            //var templates = voucherRepository.Find(x => x.AppId == this.AppId, project.Include(x => x.FContentId).
            //    Include(x => x.TemplateName)).Select(x => new Template { TemplateId = x.FContentId, TemplateName = x.TemplateName }).AsQueryable<Template>();
            //Exclude表示包含那些字段
            //List<ExchangeRate> exchangeRates = exchangeRateRepository.Find(x => x.AppId == this.AppId, project.Exclude(x => x.CurrencyXRates).Exclude(y => y.ExchangeRateId));

            return mongoCollection.Find(expression).Project(projecter).Sort(sorter).ToListAsync();
        }

        /// <summary>
        ///  批处理操作,操作的数据条数需要大于0
        /// </summary>
        /// <param name="updates"></param>
        /// <returns></returns>
        public Task<BulkWriteResult<T>> BulkWrite(List<WriteModel<T>> updates, BulkWriteOptions options = null)
        {
            //eg:使用示例
            //List<WriteModel<BusinessDataLockRule>> rules = new List<WriteModel<BusinessDataLockRule>>();
            //foreach (var ruleName in ruleNames)
            //{
            //    var lockRule = lockRules.FirstOrDefault(x => x.RuleName == ruleName);
            //    var dimDLMember = string.Join("-", ruleName.Split("-").Skip(3));
            //    if (lockRule == null)
            //    {
            //        lockRule = new BusinessDataLockRule();
            //        lockRule.RuleName = ruleName;
            //        lockRule.Locked = true;
            //        var insertOneModel = new InsertOneModel<BusinessDataLockRule>(lockRule);
            //        rules.Add(insertOneModel);
            //    }
            //    else
            //    {
            //        var filterDefinition = Builders<BusinessDataLockRule>.Filter.Eq(x => x.Id, lockRule.Id);
            //        var updateDefinition = Builders<BusinessDataLockRule>.Update.Set(x => x.Locked, lockRule.Locked)
            //                                                                    .Set(x => x.LockDimensions, lockRule.LockDimensions)
            //                                                                    .Set(x => x.LockTime, DateTime.Now);
            //        var updateOneModel = new UpdateOneModel<BusinessDataLockRule>(filterDefinition, updateDefinition);
            //        rules.Add(updateOneModel);
            //    }
            //}
            //if (!rules.IsNullOrEmpty())
            //{
            //    mongoCollection.BulkWriteAsync(rules, new BulkWriteOptions { IsOrdered = false });
            //}
            return mongoCollection.BulkWriteAsync(updates,options);
        }

        /// <summary>
        /// 根据条件获取结果列表
        /// </summary>
        /// <param name="filter">条件FilterDefinition</param>
        /// <returns>结果列表</returns>
        public Task<List<T>> Find(FilterDefinition<T> filter, ProjectionDefinition<T, T> projecter = null, SortDefinition<T> sorter = null)
        {
            return mongoCollection.Find(filter).Project(projecter).Sort(sorter).ToListAsync();
        }
        /// <summary>
        /// 排序扩展方法
        /// </summary>
        public static class MongoDBExt
        {
            //eg:MongoDBExt.GetSortDefinition<CheckRuleGroup>("targetType,targetId,fContentType desc")
            /// <summary>
            ///  生成SortDefinition对象 根据排序字符串（和sql一样）
            ///  规则如下：Model属性名 [asc|desc]  ，默认asc可以不写，eg: id,name desc 
            /// </summary>
            /// <typeparam name="T"></typeparam>
            /// <param name="orderBy"></param>
            /// <returns></returns>
            public static SortDefinition<T> GetSortDefinition<T>(string orderBy)
            {
                if (string.IsNullOrEmpty(orderBy)) return null;

                var builder = Builders<T>.Sort;
                List<SortDefinition<T>> sorts = new List<SortDefinition<T>>();
                foreach (var order in orderBy.Split(','))
                {
                    var ods = order.Split(' ');
                    if (ods.Length == 1 || (ods.Length == 2 && ods[1].ToLower() == "asc"))
                        sorts.Add(builder.Ascending(ods[0]));
                    else
                        sorts.Add(builder.Descending(ods[0]));
                }

                return builder.Combine(sorts);
            }
        }
    }
}