using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IStation.DAL.LocalFile
{
    public class FileSrcHelper<T> where T : class, new()
    {

        #region Query

        /// <summary>
        /// 获取全部
        /// </summary>
        public static List<T> GetAll(string path)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = FileHelper.GetFileObject<List<T>>(fileName);
            return list;
        }

        #endregion
        
        #region Append
        /// <summary>
        /// 附加一条
        /// </summary>
        public static bool Append(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            if (t == null)
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = FileHelper.GetFileObject<List<T>>(fileName);
            if (list == null)
                list = new List<T>();
            list.Add(t);
            FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 附加多条
        /// </summary>
        public static bool Appends(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            if (list == null || list.Count() < 1)
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            var srcList = FileHelper.GetFileObject<List<T>>(fileName);
            if (srcList == null)
                srcList = new List<T>();
            srcList.AddRange(list);
            FileHelper.SaveObjectFile(fileName, srcList);
            return true;
        }
        #endregion

        #region Cover
        /// <summary>
        /// 用一条覆盖
        /// </summary>
        public static bool Cover(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            if (t == null)
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = new List<T>();
            list.Add(t);
            FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 用多条覆盖
        /// </summary>
        public static bool Covers(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            if (list == null || list.Count() < 1)
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            FileHelper.SaveObjectFile(fileName, list);
            return true;
        }
        #endregion
         
        #region Exist
        /// <summary>
        /// 是否存在
        /// </summary>
        public static bool IsExist(string path)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            return File.Exists(fileName);

        } 
        #endregion


    }
}