using Longbow.Caching;
using Longbow.Caching.Configuration;
using Longbow.Data;
using Longbow.ExceptionManagement;
using Longbow.Security;
using Longbow.Security.Principal;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient;
using System.Linq;

namespace Bootstrap.DataAccess
{
    /// <summary>
    /// 用户表相关操作类
    /// </summary>
    public static class UserHelper
    {
        internal const string RetrieveUsersDataKey = "UserHelper-RetrieveUsers";
        private const string RetrieveUsersByNameDataKey = "UserHelper-RetrieveUsersByName";
        internal const string RetrieveUsersByRoleIDDataKey = "UserHelper-RetrieveUsersByRoleId";
        internal const string RetrieveUsersByGroupIDDataKey = "UserHelper-RetrieveUsersByGroupId";
        /// <summary>
        /// 查询所有用户
        /// </summary>
        /// <param name="pIds"></param>
        /// <returns></returns>
        public static IEnumerable<User> RetrieveUsers(string tId = null)
        {
            string sql = "select ID, UserName, DisplayName, RegisterTime, ApprovedTime from Users Where ApprovedTime is not null";
            var ret = CacheManager.GetOrAdd(RetrieveUsersDataKey, CacheSection.RetrieveIntervalByKey(RetrieveUsersDataKey), key =>
            {
                List<User> Users = new List<User>();
                DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql);
                try
                {
                    using (DbDataReader reader = DBAccessManager.SqlDBAccess.ExecuteReader(cmd))
                    {
                        while (reader.Read())
                        {
                            Users.Add(new User()
                            {
                                ID = (int)reader[0],
                                UserName = (string)reader[1],
                                DisplayName = (string)reader[2],
                                RegisterTime = (DateTime)reader[3],
                                ApprovedTime = (DateTime)reader[4]
                            });
                        }
                    }
                }
                catch (Exception ex) { ExceptionManager.Publish(ex); }
                return Users;
            }, CacheSection.RetrieveDescByKey(RetrieveUsersDataKey));
            return string.IsNullOrEmpty(tId) ? ret : ret.Where(t => tId.Equals(t.ID.ToString(), StringComparison.OrdinalIgnoreCase));
        }
        /// <summary>
        /// 根据用户名查询用户
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public static User RetrieveUsersByName(string userName)
        {
            if (LgbPrincipal.IsAdmin(userName)) return new User() { DisplayName = "网站管理员", UserName = userName };
            string key = string.Format("{0}-{1}", RetrieveUsersByNameDataKey, userName);
            return CacheManager.GetOrAdd(key, CacheSection.RetrieveIntervalByKey(RetrieveUsersByNameDataKey), k =>
            {
                User user = null;
                string sql = "select ID, UserName, [Password], PassSalt, DisplayName, RegisterTime, ApprovedTime from Users where ApprovedTime is not null and UserName = @UserName";
                DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql);
                try
                {
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@UserName", userName, ParameterDirection.Input));
                    using (DbDataReader reader = DBAccessManager.SqlDBAccess.ExecuteReader(cmd))
                    {
                        if (reader.Read())
                        {
                            user = new User()
                            {
                                ID = (int)reader[0],
                                UserName = (string)reader[1],
                                Password = (string)reader[2],
                                PassSalt = (string)reader[3],
                                DisplayName = (string)reader[4],
                                RegisterTime = (DateTime)reader[5],
                                ApprovedTime = (DateTime)reader[6]
                            };
                        }
                    }
                }
                catch (Exception ex) { ExceptionManager.Publish(ex); }
                return user;
            }, CacheSection.RetrieveDescByKey(RetrieveUsersByNameDataKey));
        }
        /// <summary>
        /// 删除用户
        /// </summary>
        /// <param name="ids"></param>
        public static bool DeleteUser(string ids)
        {
            bool ret = false;
            if (string.IsNullOrEmpty(ids) || ids.Contains("'")) return ret;
            try
            {
                using (DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.StoredProcedure, "Proc_DeleteUsers"))
                {
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@ids", ids, ParameterDirection.Input));
                    DBAccessManager.SqlDBAccess.ExecuteNonQuery(cmd);
                }
                CacheCleanUtility.ClearCache(userIds: ids);
                ret = true;
            }
            catch (Exception ex)
            {
                ExceptionManager.Publish(ex);
            }
            return ret;
        }
        /// <summary>
        /// 保存新建/更新的用户信息
        /// </summary>
        /// <param name="p"></param>
        /// <returns></returns>
        public static bool SaveUser(User p)
        {
            if (p == null) throw new ArgumentNullException("p");
            bool ret = false;
            if (p.UserName.Length > 50) 
                p.UserName.Substring(0, 50);
            p.PassSalt = LgbCryptography.GenerateSalt();
            p.Password = LgbCryptography.ComputeHash(p.Password, p.PassSalt);
            if (string.IsNullOrEmpty(p.Description))
                p.Description=" ";
            else if(p.Description.Length > 500)
               p.Description.Substring(0, 500);
            string sql = p.ID == 0 ?
                "Insert Into Users (UserName, Password, PassSalt, DisplayName, RegisterTime, ApprovedTime,Description) Values (@UserName, @Password, @PassSalt, @DisplayName, GetDate(), @ApprovedTime,@Description)" :
                "Update Users set UserName = @UserName, Password = @Password, PassSalt = @PassSalt, DisplayName = @DisplayName,Description=@Description where ID = @ID";
            try
            {
                using (DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql))
                {
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@ID", p.ID, ParameterDirection.Input));
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@UserName", p.UserName, ParameterDirection.Input));
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@Password", p.Password, ParameterDirection.Input));
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@PassSalt", p.PassSalt, ParameterDirection.Input));
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@DisplayName", p.DisplayName, ParameterDirection.Input));
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@ApprovedTime", DBAccess.ToDBValue(p.ApprovedTime), ParameterDirection.Input));
                    cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@Description", p.Description, ParameterDirection.Input));
                    DBAccessManager.SqlDBAccess.ExecuteNonQuery(cmd);
                }
                CacheCleanUtility.ClearCache(userIds: p.ID == 0 ? "" : p.ID.ToString());
                ret = true;
            }
            catch (DbException ex)
            {
                ExceptionManager.Publish(ex);
            }
            return ret;
        }
        /// <summary>
        /// 验证用户登陆账号与密码正确
        /// </summary>
        /// <param name="userName"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        public static bool Authenticate(string userName, string password)
        {
            var user = RetrieveUsersByName(userName);
            return user != null && user.Password == LgbCryptography.ComputeHash(password, user.PassSalt);
        }
        /// <summary>
        /// 通过roleId获取所有用户
        /// </summary>
        /// <param name="roleId"></param>
        /// <returns></returns>
        public static IEnumerable<User> RetrieveUsersByRoleId(int roleId)
        {
            string key = string.Format("{0}-{1}", RetrieveUsersByRoleIDDataKey, roleId);
            return CacheManager.GetOrAdd(key, CacheSection.RetrieveIntervalByKey(RetrieveUsersByNameDataKey), k =>
            {
                List<User> Users = new List<User>();
                string sql = "select u.ID, u.UserName, u.DisplayName, case ur.UserID when u.ID then 'checked' else '' end [status] from Users u left join UserRole ur on u.ID = ur.UserID and RoleID = @RoleID where u.ApprovedTime is not null";
                DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql);
                cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@RoleID", roleId, ParameterDirection.Input));
                try
                {
                    using (DbDataReader reader = DBAccessManager.SqlDBAccess.ExecuteReader(cmd))
                    {
                        while (reader.Read())
                        {
                            Users.Add(new User()
                            {
                                ID = (int)reader[0],
                                UserName = (string)reader[1],
                                DisplayName = (string)reader[2],
                                Checked = (string)reader[3]
                            });
                        }
                    }
                }
                catch (Exception ex) { ExceptionManager.Publish(ex); }
                return Users;
            }, CacheSection.RetrieveDescByKey(RetrieveUsersByRoleIDDataKey));
        }
        /// <summary>
        /// 通过角色ID保存当前授权用户（插入）
        /// </summary>
        /// <param name="id">角色ID</param>
        /// <param name="value">用户ID数组</param>
        /// <returns></returns>
        public static bool SaveUsersByRoleId(int id, string userIds)
        {
            bool ret = false;
            DataTable dt = new DataTable();
            dt.Columns.Add("RoleID", typeof(int));
            dt.Columns.Add("UserID", typeof(int));
            if (!string.IsNullOrEmpty(userIds)) userIds.Split(',').ToList().ForEach(userId => dt.Rows.Add(id, userId));
            using (TransactionPackage transaction = DBAccessManager.SqlDBAccess.BeginTransaction())
            {
                try
                {
                    //删除用户角色表该角色所有的用户
                    string sql = "delete from UserRole where RoleID=@RoleID";
                    using (DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql))
                    {
                        cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@RoleID", id, ParameterDirection.Input));
                        DBAccessManager.SqlDBAccess.ExecuteNonQuery(cmd, transaction);
                        //批插入用户角色表
                        using (SqlBulkCopy bulk = new SqlBulkCopy((SqlConnection)transaction.Transaction.Connection, SqlBulkCopyOptions.Default, (SqlTransaction)transaction.Transaction))
                        {
                            bulk.DestinationTableName = "UserRole";
                            bulk.ColumnMappings.Add("RoleID", "RoleID");
                            bulk.ColumnMappings.Add("UserID", "UserID");
                            bulk.WriteToServer(dt);
                            transaction.CommitTransaction();
                        }
                    }
                    CacheCleanUtility.ClearCache(userIds: userIds, roleIds: id.ToString());
                    ret = true;
                }
                catch (Exception ex)
                {
                    ExceptionManager.Publish(ex);
                    transaction.RollbackTransaction();
                }
            }
            return ret;
        }
        /// <summary>
        /// 通过groupId获取所有用户
        /// </summary>
        /// <param name="roleId"></param>
        /// <returns></returns>
        public static IEnumerable<User> RetrieveUsersByGroupId(int groupId)
        {
            string key = string.Format("{0}-{1}", RetrieveUsersByGroupIDDataKey, groupId);
            return CacheManager.GetOrAdd(key, CacheSection.RetrieveIntervalByKey(RetrieveUsersByGroupIDDataKey), k =>
            {
                List<User> Users = new List<User>();
                string sql = "select u.ID, u.UserName, u.DisplayName, case ur.UserID when u.ID then 'checked' else '' end [status] from Users u left join UserGroup ur on u.ID = ur.UserID and GroupID =@groupId where u.ApprovedTime is not null";
                DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql);
                cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@GroupID", groupId, ParameterDirection.Input));
                try
                {
                    using (DbDataReader reader = DBAccessManager.SqlDBAccess.ExecuteReader(cmd))
                    {
                        while (reader.Read())
                        {
                            Users.Add(new User()
                            {
                                ID = (int)reader[0],
                                UserName = (string)reader[1],
                                DisplayName = (string)reader[2],
                                Checked = (string)reader[3]
                            });
                        }
                    }
                }
                catch (Exception ex) { ExceptionManager.Publish(ex); }
                return Users;
            }, CacheSection.RetrieveDescByKey(RetrieveUsersByRoleIDDataKey));
        }
        /// <summary>
        /// 通过部门ID保存当前授权用户（插入）
        /// </summary>
        /// <param name="id">GroupID</param>
        /// <param name="value">用户ID数组</param>
        /// <returns></returns>
        public static bool SaveUsersByGroupId(int id, string userIds)
        {
            bool ret = false;
            DataTable dt = new DataTable();
            dt.Columns.Add("UserID", typeof(int));
            dt.Columns.Add("GroupID", typeof(int));
            if (!string.IsNullOrEmpty(userIds)) userIds.Split(',').ToList().ForEach(userId => dt.Rows.Add(userId, id));
            using (TransactionPackage transaction = DBAccessManager.SqlDBAccess.BeginTransaction())
            {
                try
                {
                    //删除用户角色表该角色所有的用户
                    string sql = "delete from UserGroup where GroupID = @GroupID";
                    using (DbCommand cmd = DBAccessManager.SqlDBAccess.CreateCommand(CommandType.Text, sql))
                    {
                        cmd.Parameters.Add(DBAccessManager.SqlDBAccess.CreateParameter("@GroupID", id, ParameterDirection.Input));
                        DBAccessManager.SqlDBAccess.ExecuteNonQuery(cmd, transaction);
                        //批插入用户角色表
                        using (SqlBulkCopy bulk = new SqlBulkCopy((SqlConnection)transaction.Transaction.Connection, SqlBulkCopyOptions.Default, (SqlTransaction)transaction.Transaction))
                        {
                            bulk.DestinationTableName = "UserGroup";
                            bulk.ColumnMappings.Add("UserID", "UserID");
                            bulk.ColumnMappings.Add("GroupID", "GroupID");
                            bulk.WriteToServer(dt);
                            transaction.CommitTransaction();
                        }
                    }
                    CacheCleanUtility.ClearCache(userIds: userIds, groupIds: id.ToString());
                    ret = true;
                }
                catch (Exception ex)
                {
                    ExceptionManager.Publish(ex);
                    transaction.RollbackTransaction();
                }
            }
            return ret;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public static bool RegisterUser(string userName, string displayName, string password,string description)
        {
            //TODO：未完成并通知管理员组有新用户注册，需要批复。
            if (string.IsNullOrEmpty(userName) || string.IsNullOrEmpty(displayName) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(description)) 
                return false;
            return SaveUser(new User() { UserName = userName, DisplayName = displayName, Password = password,Description=description });
        }
    }
}