using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;

namespace DBHelper_SqlSugar
{
    /// <summary>
    /// DB，禁止跨上下文使用
    /// 1.异步情况： 在同一串await 中是一个上下文 (await 会改变线程和同步是不一样的)
    /// 2.同步情况： 在同一个线程是同一个上下文
    /// </summary>
    public class Db
    {
        /// <summary>
        /// 上下文集合
        /// </summary>
        private readonly List<ContextList> _contexts = new List<ContextList>();

        /// <summary>
        /// 默认上下文类类型
        /// </summary>
        public static string DefaultDbContextType { get; private set; } = null!;

        public static T Do<T>(Func<Db, T> func)
        {
            var db = new Db();
            try
            {
                db.Default.BeginTran();
                var res = func(db);
                db.Default.CommitTran();
                return res;
            }
            catch (Exception ex)
            {
                //var qty = ex.EntityValidationErrors.Count();
                //var info = ex.EntityValidationErrors.First();
                //var msg = "有" + qty + "条数据验证失败，首条错误信息:\n" + string.Join("\n", info.MemberNames) + "\n" + (info.ErrorMessage ?? "");
                Console.WriteLine(ex.Message);
                throw new Exception(ex.Message);
            }
        }

        public static void Do(Action<Db> act)
        {
            Do(db =>
            {
                act(db);
                return 1;
            });
        }

        /// <summary>
        /// 设置默认链接
        /// </summary>
        /// <param name="key"></param>
        public static void SetDefaultDbContextType(string key)
        {
            DefaultDbContextType = key;
        }

        /// <summary>
        /// 默认链接
        /// </summary>
        public SqlSugarClient Default
        {
            get
            {
                if (DefaultDbContextType == null)
                    throw new Exception("请先设置默认数据库,调用静态方法SetDefaultDbContextType()");
                return Context(DefaultDbContextType);
            }
        }

        /// <summary>
        /// 创建一个上下文
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public SqlSugarClient CreateContext(ConnectionConfig config, string key)
        {
            var ctx = _contexts.FirstOrDefault(v => v.key == key);
            if (ctx != null) return ctx.Client;
            ctx = new ContextList()
            {
                key = key,
                Client = new SqlSugarClient(new ConnectionConfig()
                {
                    ConnectionString = "连接符字串",
                    DbType = DbType.SqlServer,
                    IsAutoCloseConnection = true
                }),
                ConnectionConfig = config
            };

            _contexts.Add(ctx);
            return ctx.Client;
        }

        public SqlSugarClient Context(string key)
        {
            var ctx = _contexts.FirstOrDefault(v => v.key == key);
            if (ctx == null) throw new Exception("没有对应的链接，请先调用创建");
            return ctx.Client;
        }
    }

    /// <summary>
    /// 找到
    /// </summary>
    public class ContextList

    {
        public string key { get; set; }

        public SqlSugarClient Client { get; set; }

        public ConnectionConfig ConnectionConfig { get; set; }
    }
}