using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Dapper;
using MySql.Data.MySqlClient;

namespace Hncore.Infrastructure.Common
{
    public class ConcurrentHelper
    {
        private static string _connString = "";
        private static string _tableName = "concurrent_helper";

        private List<string> _infos = new List<string>();

        private string _id;

        public static void Init(string mysqlConn)
        {
            _connString = mysqlConn;

            MySqlHelper.Execute(_connString
                , $@"create table if not exists {_tableName}
                        (
	                        Id VARCHAR(32) PRIMARY KEY UNIQUE,
	                        CreateTime datetime DEFAULT now(),
                            Info text
                        )"
            );
        }

        public ConcurrentHelper AddInfo(string info)
        {
            _infos.Add(info);

            return this;
        }

        private async Task<bool> GetAuthority()
        {
            try
            {
                string info = ListHelper<string>.ListToStr(_infos, "\n");
                _id = SecurityHelper.GetMd5Hash(info);

                string sql = $"insert into {_tableName}(Id,Info) values(@Id,@Info)";

                await MySqlHelper.ExecuteAsync(_connString, sql, new {Id = _id, Info = info});
            }
            catch
            {
                return false;
            }

            return true;
        }

        public async Task Execute(Action action)
        {
            try
            {
                if (await GetAuthority())
                {
                    action();
                }
            }
            catch (Exception e)
            {
                await MySqlHelper.ExecuteAsync(_connString, $"DELETE FROM {_tableName} where Id='{_id}'");

                throw e;
            }
        }
    }
}