using SlnMesnac.LabelPrint.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SlnMesnac.LabelPrint.TaskQueue
{
    public class TaskHelper
    {

        #region 单例实现
        private static readonly Lazy<TaskHelper> lazy = new Lazy<TaskHelper>(() => new TaskHelper());

        public static TaskHelper Instance
        {
            get
            {
                return lazy.Value;
            }
        }
        #endregion

        #region 委托事件
        /// <summary>
        /// 清除标签信息
        /// </summary>
        /// <param name="message"></param>
        public delegate void ClearLabelInfoDataGrid(BaseLabelInfo baseLabelInfo);
        public event ClearLabelInfoDataGrid ClearLabelInfoDataGridEvent;
        #endregion

        public TaskHelper() { }

        private List<BaseLabelInfo> labelTask = new List<BaseLabelInfo>();

        /// <summary>
        /// 添加标签任务
        /// </summary>
        /// <param name="labelInfos"></param>
        public void AddTask(List<BaseLabelInfo> labelInfos)
        {
            if (labelInfos == null) return;
            labelTask.AddRange(labelInfos);
        }

        /// <summary>
        /// 获取标签任务，根据时间返回第一个不同的标签
        /// </summary>
        /// <returns></returns>
        public BaseLabelInfo GetTask()
        {
            return labelTask.OrderBy(x => x.recordTime).FirstOrDefault();
        }

        /// <summary>
        /// 删除标签任务，打印完成后删除队列中的任务
        /// </summary>
        /// <param name="item"></param>
        public void RemoveTask(BaseLabelInfo item)
        {
            labelTask.Remove(item);
            ClearLabelInfoDataGridEvent?.Invoke(item);
        }

    }
}