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

namespace IStation.DAL.LocalFile
{
    /// <summary>
    /// 带Id的文件辅助类
    /// </summary>
    public class FileIdHelper<T> where T : Entity.BaseEntity
    { 
        #region Get

        /// <summary>
        /// 查询全部
        /// </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;
        }

        /// <summary>
        /// 根据 Id查询
        /// </summary>
        public static T GetById(string path, long Id)
        {
            var list = GetAll(path);
            if (list == null || list.Count < 1)
                return default;
            return list.Find(t => t.Id == Id);
        }

        /// <summary>
        /// 根据 Id集合查询
        /// </summary>
        public static IEnumerable<T> GetByIds(string path, IEnumerable<long> Ids)
        {
            if (Ids == null || Ids.Count() < 1)
                return default;
            var list = GetAll(path);
            return list?.Where(x => Ids.Contains(x.Id));
        }

        /// <summary>
        /// 查询最近一条
        /// </summary>
        public static T GetLatest(string path)
        {
            var list = GetAll(path);
            if (list == null || list.Count < 1)
                return default;
            return list.Last();
        }

        #endregion

        #region Insert

        /// <summary>
        /// 插入
        /// </summary>
        public static long Insert(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            t.Id = SnowflakeIdHelper.NextId();
            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 t.Id;
        }

        /// <summary>
        /// 插入
        /// </summary>
        public static long Insert(string path, IEnumerable<T> srcList, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            t.Id = SnowflakeIdHelper.NextId();
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = new List<T>();
            if (srcList != null && srcList.Count() > 0)
            {
                list.AddRange(srcList);
            }
            list.Add(t);
            FileHelper.SaveObjectFile(fileName, list);
            return t.Id;
        }

        /// <summary>
        /// 插入并返回
        /// </summary>
        public static T InsertR(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            t.Id = SnowflakeIdHelper.NextId();
            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 t;
        }
          
        /// <summary>
        /// 插入并返回
        /// </summary>
        public static T InsertR(string path, IEnumerable<T> srcList, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            t.Id = SnowflakeIdHelper.NextId();
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = new List<T>();
            if (srcList != null && srcList.Count() > 0)
            {
                list.AddRange(srcList);
            }
            list.Add(t);
            FileHelper.SaveObjectFile(fileName, list);
            return t;
        }

        /// <summary>
        /// 批量插入
        /// </summary>
        public static bool Inserts(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (list == null || list.Count() < 1)
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            var srcList = FileHelper.GetFileObject<List<T>>(fileName);
            if (srcList == null)
                srcList = new List<T>();
            var list_Ids = list.ToList();
            list_Ids.ForEach(x => x.Id = SnowflakeIdHelper.NextId());
            srcList.AddRange(list_Ids);
            FileHelper.SaveObjectFile(fileName, srcList);
            return true;
        }

        /// <summary>
        /// 批量插入
        /// </summary>
        public static bool Inserts(string path, IEnumerable<T> srcList, IEnumerable<T> newList)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (newList == null || newList.Count() < 1)
                return default;
            var list = new List<T>();
            if (srcList != null && srcList.Count() > 0)
                list.AddRange(srcList);
            var newList1 = newList.ToList();
            newList1.ForEach(x => x.Id = SnowflakeIdHelper.NextId());
            list.AddRange(newList1);
            var fileName = FileHelper.GetFilePath<T>(path);
            FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 批量插入并返回
        /// </summary>
        public static List<T> InsertRs(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (list == null || list.Count() < 1)
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            var srcList = FileHelper.GetFileObject<List<T>>(fileName);
            if (srcList == null)
                srcList = new List<T>();
            var newList = list.ToList();
            newList.ForEach(x => x.Id = SnowflakeIdHelper.NextId());
            srcList.AddRange(newList);
            FileHelper.SaveObjectFile(fileName, srcList);
            return newList.ToList();
        }

        /// <summary>
        /// 批量插入并返回
        /// </summary>
        public static List<T> InsertRs(string path, IEnumerable<T> srcList, IEnumerable<T> newList)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (newList == null || newList.Count() < 1)
                return default;
            var list = new List<T>();
            if (srcList != null && srcList.Count() > 0)
                list.AddRange(srcList);
            var newList1 = newList.ToList();
            newList1.ForEach(x => x.Id = SnowflakeIdHelper.NextId());
            list.AddRange(newList1);
            var fileName = FileHelper.GetFilePath<T>(path);
            FileHelper.SaveObjectFile(fileName, list);
            return newList1.ToList();
        }

        #endregion

        #region Update
        /// <summary>
        /// 更新
        /// </summary>
        public static bool Update(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = FileHelper.GetFileObject<List<T>>(fileName);
            if (list == null || list.Count < 1)
                return default;
            var src = list.Find(x => x.Id == t.Id);
            if (src == null)
                return default;
            t.Map(src);
            FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 批量更新
        /// </summary>
        public static bool Updates(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (list == null || list.Count() < 1)
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            var srcList = FileHelper.GetFileObject<List<T>>(fileName);
            if (srcList == null || srcList.Count < 1)
                return default;
            foreach (var t in list)
            {
                var src = srcList.Find(x => x.Id == t.Id);
                if (src == null)
                    return default;
                t.Map(src);
            }
            FileHelper.SaveObjectFile(fileName, srcList);
            return true;
        }
        #endregion

        #region Cover
        /// <summary>
        /// 覆盖
        /// </summary>
        public static long Cover(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            if (t.Id < 1)
                t.Id = SnowflakeIdHelper.NextId();
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = new List<T>();
            list.Add(t);
            FileHelper.SaveObjectFile(fileName, list);
            return t.Id;
        }

        /// <summary>
        /// 覆盖并返回
        /// </summary>
        public static T CoverR(string path, T t)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (t == null)
                return default;
            if (t.Id < 1)
                t.Id = SnowflakeIdHelper.NextId();
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = new List<T>();
            list.Add(t);
            FileHelper.SaveObjectFile(fileName, list);
            return t;
        }

        /// <summary>
        /// 批量覆盖
        /// </summary>
        public static bool Covers(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (list == null || list.Count() < 1)
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            foreach (var t in list)
            {
                if (t.Id < 1)
                    t.Id = SnowflakeIdHelper.NextId();
            }
            FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 批量覆盖并返回
        /// </summary>
        public static List<T> CoversR(string path, IEnumerable<T> list)
        {
            if (string.IsNullOrEmpty(path))
                return default;
            if (list == null || list.Count() < 1)
                return default;
            var fileName = FileHelper.GetFilePath<T>(path);
            foreach (var t in list)
            {
                if (t.Id < 1)
                    t.Id = SnowflakeIdHelper.NextId();
            }
            FileHelper.SaveObjectFile(fileName, list);
            return list.ToList();
        }
        #endregion
         
        #region Delete
        /// <summary>
        /// 根据 Id删除
        /// </summary>
        public static bool DeleteById(string path, long Id)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = FileHelper.GetFileObject<List<T>>(fileName);
            if (list == null || list.Count < 1)
                return false;
            var item = list.Find(t => t.Id == Id);
            if (item == null)
                return false;
            list.Remove(item);
            if (list.Count < 1)
                File.Delete(fileName);
            else
                FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 根据 Id集合删除
        /// </summary>
        public static bool DeleteByIds(string path, IEnumerable<long> Ids)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            if (Ids == null || Ids.Count() < 1)
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            var list = FileHelper.GetFileObject<List<T>>(fileName);
            if (list == null || list.Count < 1)
                return false;
            list.RemoveAll(x => Ids.Contains(x.Id));
            if (list.Count < 1)
                File.Delete(fileName);
            else
                FileHelper.SaveObjectFile(fileName, list);
            return true;
        }

        /// <summary>
        /// 删除全部
        /// </summary>
        public static bool DeleteAll(string path)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            if (File.Exists(fileName))
                File.Delete(fileName);
            return true;
        }

        #endregion
        
        #region Exist

        /// <summary>
        /// 是否存在
        /// </summary>
        public static bool IsExist(string path)
        {
            if (string.IsNullOrEmpty(path))
                return false;
            var fileName = FileHelper.GetFilePath<T>(path);
            if (!File.Exists(fileName))
                return false;
            var all = GetAll(path);
            if (all == null || all.Count < 1)
                return false;
            return true;
        }

        #endregion
    }
}