using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Common.TextUtil;
using System.Data;
using QMFrameWork.Data;

namespace Common.Applications.Verification
{
    public static class ClientVerification
    {
        private static List<ClientVerificationInformation> VerifyList = null;

        /// <summary>
        /// 初始化客户端验证模块
        /// </summary>
        public static void Init()
        {
            string sql = "";
            DataTable dt = null;
            //Data.SqlLite.SqlLiteHelper dal = new Data.SqlLite.SqlLiteHelper();
            try
            {
                sql = "SELECT * FROM T_QM_HISLICENSE";
                VerifyList = new List<ClientVerificationInformation>();
                using (IDataSession session = DataFactory.CreateSession())
                {
                    dt = session.GetTable(sql, new List<DataParameter>().ToArray());                                 
                }
                foreach (DataRow row in dt.Rows)
                {
                    ClientVerificationInformation info = new ClientVerificationInformation();

                    info.ClientSN = row["CLIENTSN"].ToString();
                    info.UserAuthority = (Data.UserAuthority)(int.Parse(row["USERAUTHORITY"].ToString()));
                    info.FlagDel = (Data.FlagDel)(int.Parse(row["FLAGDEL"].ToString()));
                    info.CreateTime = row["CREATETIME"].ToString();

                    VerifyList.Add(info);
                }     

            }
            catch (Exception ex)
            {
                throw new Exceptions.CannotInitConfigException();
            }
        }

        /// <summary>
        /// 验证客户端权限
        /// </summary>
        /// <param name="clientSN">客户端授权码</param>
        /// <returns></returns>
        public static Data.UserAuthority VerifyClient(string clientSN)
        {
            if (!clientSN.IsEmptyOrNull())
            {
                var n = VerifyList.Find(p => p.ClientSN == clientSN);
                if (n != null)
                {
                    if (n.FlagDel == Data.FlagDel.Deleted)
                    {
                        throw new Exceptions.LicenseRevokedException();
                    }
                    else
                    {
                        return n.UserAuthority;
                    }
                }
            }

            throw new Exceptions.NoneLicenseException();
        }

        /// <summary>
        /// 获取客户端的权限，不符合权限要求的返回普通用户权限
        /// </summary>
        /// <param name="clientSN">客户端授权码</param>
        /// <returns></returns>
        public static Data.UserAuthority GetVerification(string clientSN)
        {
            if (!clientSN.IsEmptyOrNull())
            {
                var n = VerifyList.Find(p => p.ClientSN == clientSN);
                if (n != null)
                {
                    if (n.FlagDel != Data.FlagDel.Deleted)
                    {
                        return n.UserAuthority;
                    }
                }
            }
            return Data.UserAuthority.User;
        }

        /// <summary>
        /// 创建新的客户端授权信息
        /// </summary>
        /// <param name="clientSN">授权人的授权码</param>
        /// <param name="addSN">要创建的授权码</param>
        /// <param name="ua">要创建的权限级别</param>
        public static void AddVerification(string clientSN, string addSN, Data.UserAuthority ua)
        {
            Data.UserAuthority auth = VerifyClient(clientSN);
            if (auth == Data.UserAuthority.User || auth == Data.UserAuthority.PowerUser)
            {
                throw new Exceptions.NotEnoughPermissionException();
            }
            else
            {
                if (ua.GetHashCode() > auth.GetHashCode())
                {
                    throw new Exceptions.NotEnoughPermissionException();
                }

                try
                {
                    using (IDataSession session = DataFactory.CreateSession())
                    {
                        DataTable table = session.GetTable("SELECT * FROM T_LICENSE WHERE CLIENTSN='" + addSN + "'",new List<DataParameter>().ToArray());

                        if (table.Rows.Count > 0)
                        {
                            throw new Exceptions.DataExistException();
                        }
                        session.ExecuteSql("INSERT INTO T_LICENSE(CLIENTSN,USERAUTHORITY,FLAGDEL,CREATETIME) VALUES('" + addSN + "','" + ua.GetHashCode().ToString() + "','0',DATETIME())");
                    }

                    VerifyList.Add(new ClientVerificationInformation() {
                    ClientSN = addSN,
                    CreateTime = DateTime.Now.ToString(TextUtil.DateTimeUtil.DATETIME_YYYYMMDD_HHMMSS),
                    FlagDel = Data.FlagDel.Normal,
                    UserAuthority = ua
                    });
                }
                catch (Exceptions.DataExistException ex)
                {
                    throw ex;
                }
                catch (Exception ex)
                {
                    throw new Exceptions.ExcuteFailsException();
                }
            }
        }

        /// <summary>
        /// 修改指定客户端的授权
        /// </summary>
        /// <param name="clientSN">授权人的授权码</param>
        /// <param name="targetSN">要修改的授权码</param>
        /// <param name="ua">要赋予的权限</param>
        public static void ModifyAuthority(string clientSN, string targetSN, Data.UserAuthority ua)
        {
            Data.UserAuthority clientAuth = VerifyClient(clientSN);
            Data.UserAuthority targetAuth = VerifyClient(targetSN);
            if (clientAuth == Data.UserAuthority.User || clientAuth == Data.UserAuthority.PowerUser)
            {
                throw new Exceptions.NotEnoughPermissionException();
            }
            else
            {
                if (targetAuth.GetHashCode() > clientAuth.GetHashCode())
                {
                    throw new Exceptions.NotEnoughPermissionException();
                }
                if (ua.GetHashCode() > clientAuth.GetHashCode())
                {
                    throw new Exceptions.NotEnoughPermissionException();
                }

                try
                {
                    using (IDataSession session = DataFactory.CreateSession())
                    {
                        session.ExecuteSql("UPDATE T_LICENSE SET USERAUTHORITY='" + ua.GetHashCode().ToString() + "' WHERE CLIENTSN='" + targetSN + "'");
                    }

                    var n = VerifyList.Find(p => p.ClientSN == targetSN);
                    n.UserAuthority = ua;
                }
                catch (Exceptions.DataExistException ex)
                {
                    throw ex;
                }
                catch (Exception ex)
                {
                    throw new Exceptions.ExcuteFailsException();
                }
            }
        }

        /// <summary>
        /// 吊销指定客户端的授权
        /// </summary>
        /// <param name="clientSN">授权人的授权码</param>
        /// <param name="targetSN">要修改的授权码</param>
        public static void DeleteAuthority(string clientSN, string targetSN)
        {
            Data.UserAuthority clientAuth = VerifyClient(clientSN);
            Data.UserAuthority targetAuth = VerifyClient(targetSN);
            if (clientAuth == Data.UserAuthority.User || clientAuth == Data.UserAuthority.PowerUser)
            {
                throw new Exceptions.NotEnoughPermissionException();
            }
            else
            {
                if (targetAuth.GetHashCode() > clientAuth.GetHashCode())
                {
                    throw new Exceptions.NotEnoughPermissionException();
                }

                try
                {
                    using (IDataSession session = DataFactory.CreateSession())
                    {
                        session.ExecuteSql("UPDATE T_LICENSE SET FLAGDEL='1' WHERE CLIENTSN='" + targetSN + "'");
                    }

                    var n = VerifyList.Find(p => p.ClientSN == targetSN);
                    n.FlagDel = Data.FlagDel.Deleted;
                }
                catch (Exceptions.DataExistException ex)
                {
                    throw ex;
                }
                catch (Exception ex)
                {
                    throw new Exceptions.ExcuteFailsException();
                }
            }
        }

        /// <summary>
        /// 获取授权列表
        /// </summary>
        /// <param name="clientSN">操作者的授权码</param>
        /// <returns></returns>
        public static System.Data.DataTable SearchAuthority(string clientSN)
        {
            Data.UserAuthority clientAuth = VerifyClient(clientSN);

            if (clientAuth == Data.UserAuthority.User || clientAuth == Data.UserAuthority.PowerUser)
            {
                throw new Exceptions.NotEnoughPermissionException();
            }
            else
            {
                try
                {
                    using (IDataSession session = DataFactory.CreateSession())
                    {
                        return session.GetTable("SELECT * FROM T_LICENSE WHERE USERAUTHORITY<'" + clientAuth.GetHashCode().ToString() + "'",new List<DataParameter>().ToArray());
                    }
                }
                catch (Exception ex)
                {
                    throw new Exceptions.ExcuteFailsException();
                }
            }
        }
    }
}