using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading.Tasks;

namespace JY.Inspection.Common
{
    public class CurrentInfo
    {
        public static Autuority autuority = Autuority.Empty;
        public static bool LoginOut = false;
    }

    [Serializable]
    public class User
    {
        /// <summary>
        /// 序号
        /// </summary>
        /// 
        [Display(Name = "序号")]
        public int Index { get; set; }
        /// <summary>
        /// 用户名
        /// </summary>
        /// 
        [Display(Name = "用户名")]
        public string UserName { get; set; }
        /// <summary>
        /// 密码
        /// </summary>
        /// 
        [Display(Name = "密码")]
        public string PassWord { get; set; }
        /// <summary>
        /// 权限
        /// </summary>
        /// 
        [Display(Name = "权限")]
        public Autuority Level { get; set; }
    }

    /// <summary>
    /// 权限枚举
    /// </summary>
    public enum Autuority
    {
        管理员,//管理员
        工程师,//工程师
        操作员,//操作员
        Empty,
    }

    public class UserHelper
    {
        private string filePath = string.Empty;
        public UserHelper(string path)
        {
            filePath = path;
        }

        /// <summary>
        /// 序列化到文件
        /// </summary>
        /// <param name="path"></param>
        /// <param name="listUser"></param>
        /// <returns></returns>
        public bool SerializedUser(string path, List<User> listUser)
        {
            if (listUser == null)
            {
                return false;
            }
            BinaryFormatter format = new BinaryFormatter();
            using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
            {
                format.Serialize(fs, listUser);
                return true;
            }
        }

        /// <summary>
        /// 反序列化到文件
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public List<User> DeSerializedUser(string path)
        {
            BinaryFormatter format = new BinaryFormatter();
            try
            {
                using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
                {
                    object o = format.Deserialize(fs);
                    return o as List<User>;
                }
            }
            catch (Exception)
            {
                return null;
            }

        }

        /// <summary>
        /// 创建超级用户
        /// </summary>
        /// <param name="path"></param>
        /// <param name="listUser"></param>
        public void CheckSupperUser(string path, List<User> listUser)
        {
            if (!File.Exists(path))
            {
                User user = new User()
                {
                    Index = 0,
                    UserName = "Admin",
                    PassWord = "Admin",
                    Level = Autuority.管理员
                };
                listUser.Add(user);
                SerializedUser(path, listUser);
            }
        }

        /// <summary>
        /// 检查重复性
        /// </summary>
        /// <param name="listUser"></param>
        /// <param name="userNmae"></param>
        /// <returns></returns>
        public bool CheckContainUser(List<User> listUser, string userNmae)
        {
            var user = from item in listUser
                       where item.UserName == userNmae
                       select item;
            if (user.Count() > 0)
            {
                return true;
            }
            return false;
        }

        /// <summary>
        /// 添加用户
        /// </summary>
        /// <param name="path"></param>
        /// <param name="listUser"></param>
        /// <param name="user"></param>
        /// <returns></returns>
        public bool AddUser(string path, List<User> listUser, User user)
        {
            try
            {
                if (user == null)
                {
                    return false;
                }
                if (CheckContainUser(listUser, user.UserName))
                {
                    return false;
                }
                listUser.Add(user);
                SerializedUser(path, listUser);
                return true;
            }
            catch
            {
                return true;
            }
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="path"></param>
        /// <param name="listUser"></param>
        /// <param name="userNmae"></param>
        /// <returns></returns>
        public bool DeleteUser(string path, List<User> listUser, string userNmae)
        {
            try
            {
                if (listUser == null)
                {
                    return false;
                }
                int index = 0;
                foreach (var item in listUser)
                {
                    if (item.UserName == userNmae)
                    {
                        break;
                    }
                    index++;
                }
                if (index == 0)
                {
                    return false;
                }
                listUser.RemoveAt(index);
                SerializedUser(path, listUser);
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 修改用户
        /// </summary>
        /// <param name="path"></param>
        /// <param name="listUser"></param>
        /// <param name="user"></param>
        /// <returns></returns>
        public bool EditUser(string path, List<User> listUser, User user)
        {
            try
            {
                if (listUser == null)
                {
                    return false;
                }
                foreach (var item in listUser)
                {
                    if (item.UserName == user.UserName)
                    {
                        item.PassWord = user.PassWord;
                        item.Level = user.Level;
                        SerializedUser(path, listUser);
                        return true;
                    }
                }
                return false;
            }
            catch
            {
                return false;
            }
        }

        public User CheckUserLogin(string path, string userName, string passWord, ref string strErr)
        {
            if (!File.Exists(path))
            {
                return null;
            }

            List<User> list = DeSerializedUser(path);
            if (list == null)
            {
                return null;
            }
            User user = new User();
            if (string.IsNullOrEmpty(userName))
            {
                var res1 = from item in list
                           where item.PassWord == passWord
                           select item;
                if (res1.Count() == 0)
                {
                    return null;
                }
                foreach (var item in res1)
                {
                    user.UserName = item.UserName;
                    user.PassWord = item.PassWord;
                    user.Level = item.Level;
                }
            }
            else
            {
                var res = from item in list
                          where item.PassWord == passWord && item.UserName == userName
                          select item;
                if (res.Count() == 0)
                {
                    return null;
                }
                foreach (var item in res)
                {
                    user.UserName = item.UserName;
                    user.PassWord = item.PassWord;
                    user.Level = item.Level;
                }
            }
            return user;
        }
    }
}