using EntrustSettle.Common;
using EntrustSettle.Common.Caches;
using EntrustSettle.Common.Const;
using EntrustSettle.Common.DB;
using EntrustSettle.Common.DB.Aop;
using Microsoft.Extensions.DependencyInjection;
using SqlSugar;
using System;
using System.Linq;
using System.Text.RegularExpressions;

namespace EntrustSettle.Extensions
{
    /// <summary>
    /// SqlSugar 启动服务
    /// </summary>
    public static class SqlsugarSetup
    {
        public static void AddSqlsugarSetup(this IServiceCollection services)
        {
            if (services == null) throw new ArgumentNullException(nameof(services));

            // 默认添加主数据库连接
            if (!AppSettings.app("MainDB").IsNullOrEmpty())
            {
                MainDb.CurrentDbConnId = AppSettings.app("MainDB");
            }

            BaseDBConfig.MutiConnectionString.allDbs.ForEach(m =>
            {
                var config = new ConnectionConfig()
                {
                    ConfigId = m.ConnId.ObjToString().ToLower(),
                    ConnectionString = m.Connection,
                    DbType = (DbType)m.DbType,
                    IsAutoCloseConnection = true,
                    // Check out more information: https://github.com/anjoy8/EntrustSettle/issues/122
                    //IsShardSameThread = false,
                    MoreSettings = new ConnMoreSettings()
                    {
                        //IsWithNoLockQuery = true,
                        IsAutoRemoveDataCache = true,
                        SqlServerCodeFirstNvarchar = true,
                    },
                    // 从库
                    SlaveConnectionConfigs = m.Slaves?.Where(s => s.HitRate > 0).Select(s => new SlaveConnectionConfig
                    {
                        ConnectionString = s.Connection,
                        HitRate = s.HitRate
                    }).ToList(),
                    // 自定义特性
                    ConfigureExternalServices = new ConfigureExternalServices()
                    {
                        DataInfoCacheService = new SqlSugarCacheService(),
                        EntityService = (property, column) =>
                        {
                            if (column.IsPrimarykey && property.PropertyType == typeof(int))
                            {
                                column.IsIdentity = true;
                            }
                            // 为long?/Datetime?等可为Null的类型以及String，统一设置IsNullable=true
                            if (column.IsPrimarykey == false &&
                                (column.PropertyInfo.PropertyType == typeof(string) || Nullable.GetUnderlyingType(column.PropertyInfo.PropertyType) != null))
                            {
                                column.IsNullable = true;
                            }
                        }
                    },
                    InitKeyType = InitKeyType.Attribute
                };
                if (SqlSugarConst.LogConfigId.ToLower().Equals(m.ConnId.ToLower()))
                {
                    BaseDBConfig.LogConfig = config;
                }
                else
                {
                    if (string.Equals(config.ConfigId, MainDb.CurrentDbConnId,
                            StringComparison.CurrentCultureIgnoreCase))
                    {
                        BaseDBConfig.MainConfig = config;
                    }
                    else if (m.ConnId.ToLower().StartsWith(MainDb.CurrentDbConnId.ToLower()))
                    {
                        //复用连接
                        BaseDBConfig.ReuseConfigs.Add(config);
                    }


                    BaseDBConfig.ValidConfig.Add(config);
                }

                BaseDBConfig.AllConfigs.Add(config);
            });

            if (AppSettings.app("AppSettings", "LogToDb").ObjToBool() && BaseDBConfig.LogConfig is null)
            {
                throw new ApplicationException("未配置Log库连接");
            }

            // SqlSugarScope是线程安全，可使用单例注入
            // 参考：https://www.donet5.com/Home/Doc?typeId=1181
            services.AddSingleton<ISqlSugarClient>(o =>
            {
                return new SqlSugarScope(BaseDBConfig.AllConfigs, db =>
                {
                    BaseDBConfig.ValidConfig.ForEach(config =>
                    {
                        var dbProvider = db.GetConnectionScope((string)config.ConfigId);

                        // 打印SQL语句
                        dbProvider.Aop.OnLogExecuting = (s, parameters) =>
                        {
                            SqlSugarAop.OnLogExecuting(dbProvider, App.User?.Name.ObjToString(), ExtractTableName(s),
                                Enum.GetName(typeof(SugarActionType), dbProvider.SugarActionType), s, parameters,
                                config);
                        };

                        // 数据初始化
                        dbProvider.Aop.DataExecuting = SqlSugarAop.DataExecuting;

                        // 配置实体假删除过滤器
                        RepositorySetting.SetDeletedEntityFilter(dbProvider);
                        // 配置租户
                        RepositorySetting.SetTenantEntityFilter(dbProvider);
                    });
                    //故障转移,检查主库链接自动切换备用连接
                    SqlSugarReuse.AutoChangeAvailableConnect(db);
                });
            });
        }

        private static string ExtractTableName(string sql)
        {
            // 匹配 SQL 语句中的表名的正则表达式
            //string regexPattern = @"\s*(?:UPDATE|DELETE\s+FROM|SELECT\s+\*\s+FROM)\s+(\w+)";
            string regexPattern = @"(?i)(?:FROM|UPDATE|DELETE\s+FROM)\s+`(.+?)`";
            Regex regex = new Regex(regexPattern, RegexOptions.IgnoreCase);
            Match match = regex.Match(sql);

            if (match.Success)
            {
                // 提取匹配到的表名
                return match.Groups[1].Value;
            }
            else
            {
                // 如果没有匹配到表名，则返回空字符串或者抛出异常等处理
                return string.Empty;
            }
        }
    }
}