using Yitter.IdGenerator;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace IStation
{
    /// <summary>
    /// 雪花 ID 辅助类
    /// </summary>
    public class SnowflakeIdHelper
    { 
        SnowflakeIdHelper()
        {
            var options = new IdGeneratorOptions(1); //构造方法初始化雪花Id 
            YitIdHelper.SetIdGenerator(options);
        } 

        private static IIdGenerator _IdGenInstance = null;
        public static IIdGenerator IdGenInstance => _IdGenInstance;

        /// <summary> 
        /// 设置参数，建议程序初始化时执行一次 
        /// </summary> 
        /// <param name="options"></param> 
        public static void SetIdGenerator(IdGeneratorOptions options)
        {
            _IdGenInstance = new DefaultIdGenerator(options);
        }

        /// <summary> 
        /// 生成新的Id 
        /// 调用本方法前，请确保调用了 SetIdGenerator 方法做初始化。 
        /// 否则将会初始化一个WorkerId为1的对象。 
        /// </summary> 
        /// <returns></returns> 
        public static long NextId()
        {
            if (_IdGenInstance == null)
            {
                _IdGenInstance = new DefaultIdGenerator(
                new IdGeneratorOptions() { WorkerId = 0 }
                );
            }
            return _IdGenInstance.NewLong();
        }

        
    }
}