using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Yi.Framework.Infrastructure.CurrentUsers;
using Yi.Framework.Infrastructure.Data.Auditing;
using Yi.Framework.Infrastructure.Data.Entities;

namespace Yi.Framework.Infrastructure.Sqlsugar
{
    public class SqlSugarDbContext
    {
        /// <summary>
        /// SqlSugar 客户端
        /// </summary>
        public ISqlSugarClient SqlSugarClient { get; set; }

        protected ICurrentUser _currentUser;

        protected ILogger<SqlSugarDbContext> _logger;

        protected IOptions<DbConnOptions> _options;

        public SqlSugarDbContext(IOptions<DbConnOptions> options, ICurrentUser currentUser, ILogger<SqlSugarDbContext> logger)
        {
            _currentUser = currentUser;
            _logger = logger;
            _options = options;
            var dbConnOptions = options.Value;
            #region 组装options
            if (dbConnOptions.DbType is null)
            {
                throw new ArgumentException(SqlsugarConst.DbType配置为空);
            }
            var slavaConFig = new List<SlaveConnectionConfig>();
            if (dbConnOptions.EnabledReadWrite)
            {
                if (dbConnOptions.ReadUrl is null)
                {
                    throw new ArgumentException(SqlsugarConst.读写分离为空);
                }

                var readCon = dbConnOptions.ReadUrl;

                readCon.ForEach(s =>
                {
                    //如果是动态saas分库，这里的连接串都不能写死，需要动态添加，这里只配置共享库的连接
                    slavaConFig.Add(new SlaveConnectionConfig() { ConnectionString = s });
                });
            }
            #endregion
            SqlSugarClient = new SqlSugarScope(new ConnectionConfig()
            {
                //准备添加分表分库
                DbType = dbConnOptions.DbType ?? DbType.Sqlite,
                ConnectionString = dbConnOptions.Url,
                IsAutoCloseConnection = true,
                MoreSettings = new ConnMoreSettings()
                {
                    DisableNvarchar = true
                },
                SlaveConnectionConfigs = slavaConFig,
                //设置codefirst非空值判断
                ConfigureExternalServices = new ConfigureExternalServices
                {
                    EntityService = (c, p) =>
                    {
                        //高版C#写法 支持string?和string  
                        if (new NullabilityInfoContext()
                        .Create(c).WriteState is NullabilityState.Nullable)
                        {
                            p.IsNullable = true;
                        }
                    }
                }
            },
         db =>
         {
             db.Aop.DataExecuting = DataExecuting;
             db.Aop.OnLogExecuting = OnLogExecuting;
             //扩展
             OnSqlSugarClientConfig(db);
         });
        }

        /// <summary>
        /// 上下文对象扩展
        /// </summary>
        /// <param name="sqlSugarClient"></param>
        protected virtual void OnSqlSugarClientConfig(ISqlSugarClient sqlSugarClient)
        {
        }

        /// <summary>
        /// 数据
        /// </summary>
        /// <param name="oldValue"></param>
        /// <param name="entityInfo"></param>
        protected virtual void DataExecuting(object oldValue, DataFilterModel entityInfo)
        {
            switch (entityInfo.OperationType)
            {
                case DataFilterType.UpdateByObject:

                    if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.LastModificationTime)))
                    {
                        //为空或者为默认最小值
                        if (oldValue is null || DateTime.MinValue.Equals((DateTime)oldValue))
                        {
                            entityInfo.SetValue(DateTime.Now);
                        }
                    }
                    if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.LastModifierId)))
                    {
                        if (_currentUser != null)
                        {
                            entityInfo.SetValue(_currentUser.Id);
                        }
                    }
                    break;
                case DataFilterType.InsertByObject:
                    if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.CreationTime)))
                    {
                        //为空或者为默认最小值
                        if (oldValue is null || DateTime.MinValue.Equals((DateTime)oldValue))
                        {
                            entityInfo.SetValue(DateTime.Now);
                        }
                    }
                    if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.CreatorId)))
                    {
                        if (_currentUser != null)
                        {
                            entityInfo.SetValue(_currentUser.Id);
                        }
                    }

                    //插入时，需要租户id,先预留
                    if (entityInfo.PropertyName.Equals(nameof(IMultiTenant.TenantId)))
                    {
                        //if (this.CurrentTenant is not null)
                        //{
                        //    entityInfo.SetValue(this.CurrentTenant.Id);
                        //}
                    }
                    break;
            }
        }

        /// <summary>
        /// 日志
        /// </summary>
        /// <param name="s"></param>
        /// <param name="p"></param>
        protected virtual void OnLogExecuting(string s, SugarParameter[] p)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append($"\r\n 完整SQL：{UtilMethods.GetSqlString(DbType.MySql, s, p)}");
            _logger?.LogDebug(sb.ToString());
        }
    }
}