using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data.Common;
using System.Linq;
using System.Security.Principal;
using System.Web;
using System.Web.Script.Serialization;
using System.Xml.Serialization;
using NewLife.Log;
using NewLife.Model;
using NewLife.Web;

namespace XCode.Membership
{
    /// <summary>性别</summary>
    public enum SexKinds
    {
        /// <summary>未知</summary>
        未知 = 0,

        /// <summary>男</summary>
        男 = 1,

        /// <summary>女</summary>
        女 = 2
    }

    /// <summary>管理员</summary>
    [Serializable]
    [ModelCheckMode(ModelCheckModes.CheckTableWhenFirstUse)]
    public class UserX : User<UserX> { }

    /// <summary>管理员</summary>
    /// <remarks>
    /// 基础实体类应该是只有一个泛型参数的，需要用到别的类型时，可以继承一个，也可以通过虚拟重载等手段让基类实现
    /// </remarks>
    /// <typeparam name="TEntity">管理员类型</typeparam>
    public abstract partial class User<TEntity> : LogEntity<TEntity>, IUser, IManageUser, IIdentity
        where TEntity : User<TEntity>, new()
    {
        #region 对象操作
        static User()
        {
            // 用于引发基类的静态构造函数
            var entity = new TEntity();

            //!!! 曾经这里导致产生死锁
            // 这里是静态构造函数，访问Factory引发EntityFactory.CreateOperate，
            // 里面的EnsureInit会等待实体类实例化完成，实体类的静态构造函数还卡在这里
            // 不过这不是理由，同一个线程遇到同一个锁不会堵塞
            // 发生死锁的可能性是这里引发EnsureInit，而另一个线程提前引发EnsureInit拿到锁
            Meta.Factory.AdditionalFields.Add(__.Logins);
        }

        /// <summary>首次连接数据库时初始化数据，仅用于实体类重载，用户不应该调用该方法</summary>
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal protected override void InitData()
        {
            base.InitData();

            if (Meta.Count > 0) return;

            if (XTrace.Debug) XTrace.WriteLine("开始初始化{0}用户数据……", typeof(TEntity).Name);

            Add("admin", null, 1, "管理员");
            Add("poweruser", null, 2, "高级用户");
            Add("user", null, 3, "普通用户");

            if (XTrace.Debug) XTrace.WriteLine("完成初始化{0}用户数据！", typeof(TEntity).Name);
        }

        /// <summary>验证</summary>
        /// <param name="isNew"></param>
        public override void Valid(Boolean isNew)
        {
            base.Valid(isNew);

            if (String.IsNullOrEmpty(Name)) throw new ArgumentNullException(__.Name, "用户名不能为空！");
            if (RoleID < 1) throw new ArgumentNullException(__.RoleID, "没有指定角色！");

            if (isNew)
            {
                if (!String.IsNullOrEmpty(Password) && Password.Length != 32) Password = Password.MD5();
            }
            else
            {
                // 编辑修改密码
                if (Dirtys[__.Password])
                {
                    if (!Password.IsNullOrEmpty())
                        Password = Password.MD5();
                    else
                        Dirtys.Remove(__.Password);
                }
            }
        }

        /// <summary>删除用户</summary>
        /// <returns></returns>
        protected override Int32 OnDelete()
        {
            if (Meta.Count <= 1) throw new Exception("必须保留至少一个可用账号！");

            return base.OnDelete();
        }
        #endregion

        #region 扩展属性
        /// <summary>当前登录用户</summary>
        public static TEntity Current
        {
            get
            {
#if !__CORE__
                var key = "Admin";
                var ss = HttpContext.Current?.Session;
                if (ss == null) return null;

                // 从Session中获取
                if (ss[key] is TEntity entity) return entity;

                // 设置一个陷阱，避免重复计算Cookie
                if (ss[key] != null) return null;

                // 从Cookie中获取
                entity = GetCookie(key);
                if (entity != null)
                    ss[key] = entity;
                else
                    ss[key] = "1";

                return entity;
#else
                return null;
#endif
            }
            set
            {
#if !__CORE__
                var key = "Admin";
                var ss = HttpContext.Current?.Session;
                if (ss == null) return;

                // 特殊处理注销
                if (value == null)
                {
                    var entity = Current;
                    if (entity != null) WriteLog("注销", entity.Name);

                    // 修改Session
                    ss.Remove(key);
                }
                else
                {
                    // 修改Session
                    ss[key] = value;
                }

                // 修改Cookie
                SetCookie(key, value);
#else
                // 特殊处理注销
                if (value == null)
                {
                    var entity = Current;
                    if (entity != null) WriteLog("注销", entity.Name);
                }
#endif
            }
        }

        /// <summary>友好名字</summary>
        public virtual String FriendName { get { return String.IsNullOrEmpty(DisplayName) ? Name : DisplayName; } }

        /// <summary>物理地址</summary>
        [DisplayName("物理地址")]
        //[BindRelation(__.LastLoginIP)]
        public String LastLoginAddress { get { return LastLoginIP.IPToAddress(); } }
        #endregion

        #region 扩展查询
        /// <summary>根据编号查找</summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public static TEntity FindByID(Int32 id)
        {
            if (id <= 0) return null;

            if (Meta.Count >= 1000)
                return Find(__.ID, id);
            else // 实体缓存
                return Meta.Cache.Entities.FirstOrDefault(e => e.ID == id);

            // 实体缓存
            //return Meta.SingleCache[id];
        }

        /// <summary>根据名称查找</summary>
        /// <param name="name">名称</param>
        /// <returns></returns>
        public static TEntity FindByName(String name)
        {
            if (String.IsNullOrEmpty(name)) return null;

            if (Meta.Count >= 1000)
                return Find(__.Name, name);
            else // 实体缓存
                return Meta.Cache.Entities.FirstOrDefault(e => e.Name.EqualIgnoreCase(name));
        }

        /// <summary>根据邮箱地址查找</summary>
        /// <param name="mail"></param>
        /// <returns></returns>
        public static TEntity FindByMail(String mail)
        {
            if (Meta.Count >= 1000)
                return Find(__.Mail, mail);
            else // 实体缓存
                return Meta.Cache.Entities.FirstOrDefault(e => e.Mail.EqualIgnoreCase(mail));
        }

        /// <summary>根据手机号码查找</summary>
        /// <param name="phone"></param>
        /// <returns></returns>
        public static TEntity FindByPhone(String phone)
        {
            if (Meta.Count >= 1000)
                return Find(__.Phone, phone);
            else // 实体缓存
                return Meta.Cache.Entities.FirstOrDefault(e => e.Phone.EqualIgnoreCase(phone));
        }

        /// <summary>根据唯一代码查找</summary>
        /// <param name="code"></param>
        /// <returns></returns>
        public static TEntity FindByCode(String code)
        {
            if (Meta.Count >= 1000)
                return Find(__.Code, code);
            else // 实体缓存
                return Meta.Cache.Entities.FirstOrDefault(e => e.Code.EqualIgnoreCase(code));
        }
        #endregion

        #region 高级查询
        /// <summary>高级查询</summary>
        /// <param name="key"></param>
        /// <param name="roleId"></param>
        /// <param name="isEnable"></param>
        /// <param name="p"></param>
        /// <returns></returns>
        public static IList<TEntity> Search(String key, Int32 roleId, Boolean? isEnable, Pager p)
        {
            return Search(key, roleId, isEnable, DateTime.MinValue, DateTime.MinValue, p);
        }

        /// <summary>高级查询</summary>
        /// <param name="key"></param>
        /// <param name="roleId"></param>
        /// <param name="isEnable"></param>
        /// <param name="start"></param>
        /// <param name="end"></param>
        /// <param name="p"></param>
        /// <returns></returns>
        public static IList<TEntity> Search(String key, Int32 roleId, Boolean? isEnable, DateTime start, DateTime end, Pager p)
        {
            var exp = _.LastLogin.Between(start, end);
            if (roleId >= 0) exp &= _.RoleID == roleId;
            if (isEnable != null) exp &= _.Enable == isEnable;

            // 先精确查询，再模糊
            if (!key.IsNullOrEmpty())
            {
                var list = FindAll(exp & (_.Code == key | _.Name == key | _.DisplayName == key | _.Mail == key | _.Phone == key), p);
                if (list.Count > 0) return list;

                exp &= (_.Code.Contains(key) | _.Name.Contains(key) | _.DisplayName.Contains(key) | _.Mail.Contains(key) | _.Phone.Contains(key));
            }

            return FindAll(exp, p);
        }
        #endregion

        #region 扩展操作
        /// <summary>添加用户，如果存在则直接返回</summary>
        /// <param name="name"></param>
        /// <param name="pass"></param>
        /// <param name="roleid"></param>
        /// <param name="display"></param>
        /// <returns></returns>
        public static TEntity Add(String name, String pass, Int32 roleid = 1, String display = null)
        {
            //var entity = Find(_.Name == name);
            //if (entity != null) return entity;

            if (pass.IsNullOrEmpty()) pass = name;

            var entity = new TEntity();
            entity.Name = name;
            entity.Password = pass.MD5();
            entity.DisplayName = display;
            entity.RoleID = roleid;
            entity.Enable = true;

            entity.Save();

            return entity;
        }

        /// <summary>已重载。显示友好名字</summary>
        /// <returns></returns>
        public override String ToString() { return FriendName; }
        #endregion

        #region 业务
        /// <summary>登录</summary>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <param name="rememberme">是否记住密码</param>
        /// <returns></returns>
        public static TEntity Login(String username, String password, Boolean rememberme = false)
        {
            if (String.IsNullOrEmpty(username)) throw new ArgumentNullException("username");
            //if (String.IsNullOrEmpty(password)) throw new ArgumentNullException("password");

            try
            {
                var user = Login(username, password, 1);
#if !__CORE__
                if (rememberme && user != null)
                {
                    var cookie = HttpContext.Current.Response.Cookies["Admin"];
                    if (cookie != null) cookie.Expires = DateTime.Now.Date.AddYears(1);
                }
#endif
                return user;
            }
            catch (Exception ex)
            {
                WriteLog("登录", username + "登录失败！" + ex.Message);
                throw;
            }
        }

        static TEntity Login(String username, String password, Int32 hashTimes)
        {
            if (String.IsNullOrEmpty(username)) throw new ArgumentNullException("username", "该帐号不存在！");

            // 过滤帐号中的空格，防止出现无操作无法登录的情况
            var account = username.Trim();
            //var user = FindByName(account);
            // 登录时必须从数据库查找用户，缓存中的用户对象密码字段可能为空
            var user = Find(__.Name, account);
            if (user == null) throw new EntityException("帐号{0}不存在！", account);

            if (!user.Enable) throw new EntityException("账号{0}被禁用！", account);

            // 数据库为空密码，任何密码均可登录
            if (!String.IsNullOrEmpty(user.Password))
            {
                if (hashTimes > 0)
                {
                    var p = password;
                    if (!String.IsNullOrEmpty(p))
                    {
                        for (Int32 i = 0; i < hashTimes; i++)
                        {
                            p = p.MD5();
                        }
                    }
                    if (!p.EqualIgnoreCase(user.Password)) throw new EntityException("密码不正确！");
                }
                else
                {
                    var p = user.Password;
                    for (Int32 i = 0; i > hashTimes; i--)
                    {
                        p = p.MD5();
                    }
                    if (!p.EqualIgnoreCase(password)) throw new EntityException("密码不正确！");
                }
            }
            else
            {
                if (hashTimes > 0)
                {
                    var p = password;
                    if (!String.IsNullOrEmpty(p))
                    {
                        for (Int32 i = 0; i < hashTimes; i++)
                        {
                            p = p.MD5();
                        }
                    }
                    password = p;
                }
                user.Password = password;
            }

            user.SaveLoginInfo();

            Current = user;

            if (hashTimes == -1)
                WriteLog("自动登录", username);
            else
                WriteLog("登录", username);

            return user;
        }

        /// <summary>保存登录信息</summary>
        /// <returns></returns>
        protected virtual Int32 SaveLoginInfo()
        {
            Logins++;
            LastLogin = DateTime.Now;
            var ip = WebHelper.UserHost;
            if (!String.IsNullOrEmpty(ip)) LastLoginIP = ip;

            Online = true;

            return Update();
        }

        /// <summary>注销</summary>
        public virtual void Logout()
        {
            var user = Current;
            if (user != null)
            {
                user.Online = false;
                user.SaveAsync();
            }

            Current = null;
            //Thread.CurrentPrincipal = null;
        }

        /// <summary>注册用户。默认写日志后Insert，注册仅保存基本信息，需要扩展的同学请重载</summary>
        public virtual void Register()
        {
            if (RoleID == 0)
            {
                // 填写角色。最后一个普通角色，如果没有，再管理员角色
                var eop = ManageProvider.GetFactory<IRole>();
                var list = eop.FindAllWithCache().Cast<IRole>();

                // 找游客组
                var role = list.FirstOrDefault(e => e.Name == "游客");

                // 最后一个非系统角色
                if (role == null) role = list.LastOrDefault(e => !e.IsSystem);
                // 没有非系统角色，随便一个啦
                if (role == null) role = list.LastOrDefault();

                RoleID = role.ID;
            }

            Insert();
        }

#if !__CORE__
        static Boolean _isInGetCookie;
        static TEntity GetCookie(String key)
        {
            if (_isInGetCookie) return null;

            var cookie = HttpContext.Current.Request.Cookies[key];
            if (cookie == null) return null;

            var user = HttpUtility.UrlDecode(cookie["u"]);
            var pass = cookie["p"];
            if (String.IsNullOrEmpty(user) || String.IsNullOrEmpty(pass)) return null;

            _isInGetCookie = true;
            try
            {
                return Login(user, pass, -1);
            }
            catch (DbException ex)
            {
                XTrace.WriteLine("{0}登录失败！{1}", user, ex);
                return null;
            }
            catch (Exception ex)
            {
                WriteLog("登录", user + "登录失败！" + ex.Message);
                return null;
            }
            finally { _isInGetCookie = false; }
        }

        static void SetCookie(String key, TEntity entity)
        {
            var context = HttpContext.Current;
            var res = context?.Response;
            if (res == null) return;

            var reqcookie = context.Request.Cookies[key];
            if (entity != null)
            {
                var user = HttpUtility.UrlEncode(entity.Name);
                var pass = !String.IsNullOrEmpty(entity.Password) ? entity.Password.MD5() : null;
                if (reqcookie == null || user != reqcookie["u"] || pass != reqcookie["p"])
                {
                    // 只有需要写入Cookie时才设置，否则会清空原来的非会话Cookie
                    var cookie = res.Cookies[key];
                    cookie["u"] = user;
                    cookie["p"] = pass;
                }
            }
            else
            {
                var cookie = res.Cookies[key];
                cookie.Value = null;
                cookie.Expires = DateTime.Now.AddYears(-1);
                //HttpContext.Current.Response.Cookies.Remove(key);
            }
        }
#endif
        #endregion

        #region 权限日志
        /// <summary>角色</summary>
        /// <remarks>扩展属性不缓存空对象，一般来说，每个管理员都有对应的角色，如果没有，可能是在初始化</remarks>
        [XmlIgnore, ScriptIgnore]
        public virtual IRole Role
        {
            get
            {
                if (RoleID <= 0) return null;

                var role = ManageProvider.Get<IRole>();

                return role.FindByID(RoleID);
            }
        }

        /// <summary>角色名</summary>
        [DisplayName("角色")]
        [Map(__.RoleID, typeof(RoleMapProvider))]
        public virtual String RoleName { get { return Role?.Name; } }
        #endregion

        #region IManageUser 成员
        ///// <summary>编号</summary>
        //Object IManageUser.Uid { get { return ID; } }

        /// <summary>昵称</summary>
        String IManageUser.NickName { get { return DisplayName; } set { DisplayName = value; } }

        String IIdentity.Name => Name;

        String IIdentity.AuthenticationType => "XCode";

        Boolean IIdentity.IsAuthenticated => true;

        ///// <summary>是否管理员</summary>
        //Boolean IManageUser.IsAdmin { get { return RoleName == "管理员" || RoleName == "超级管理员"; } set { } }
        #endregion
    }

    class RoleMapProvider : MapProvider
    {
        public RoleMapProvider()
        {
            var role = ManageProvider.Get<IRole>();
            EntityType = role.GetType();
            Key = EntityFactory.CreateOperate(EntityType).Unique?.Name;
        }
    }

    public partial interface IUser
    {
        /// <summary>友好名字</summary>
        String FriendName { get; }

        /// <summary>角色</summary>
        IRole Role { get; }

        /// <summary>角色名</summary>
        String RoleName { get; }

        /// <summary>注销</summary>
        void Logout();

        /// <summary>保存</summary>
        /// <returns></returns>
        Int32 Save();
    }
}