/*----------------------------------------------------------------------------------

// Copyright 2019 Huawei Technologies Co.,Ltd.

// Licensed under the Apache License, Version 2.0 (the "License"); you may not use

// this file except in compliance with the License.  You may obtain a copy of the

// License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software distributed

// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR

// CONDITIONS OF ANY KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations under the License.

//----------------------------------------------------------------------------------*/

using System;

using System.Collections.Generic;

using System.Text;



namespace OBS.Internal.Negotiation

{

    internal class AuthTypeCache

    {

        internal class AuthTypeCacheItem

        {

            internal AuthTypeEnum AuthTypeEnum

            {

                get;

                set;

            }



            internal DateTime ExpireDateTime

            {

                get;

                set;

            }



        }

        private const int basicExipreMinutes = 15;

        private IDictionary<string, AuthTypeCacheItem> dict;

        private Random rd;



        public AuthTypeCache()

        {

            dict = new Dictionary<string, AuthTypeCacheItem>();

            rd = new Random();

        }



        public AuthTypeEnum? GetAuthType(string key)

        {

            if (key == null)

            {

                throw new ArgumentNullException("key");

            }

            if (this.dict.ContainsKey(key))

            {

                AuthTypeCacheItem item = this.dict[key];

                if(item.ExpireDateTime.CompareTo(DateTime.Now) > 0)

                {

                    return item.AuthTypeEnum;

                }

            }

            return null;

        }



        public void RefreshAuthType(string key, AuthTypeEnum authType)

        {

            if (key == null)

            {

                throw new ArgumentNullException("key");

            }

            this.dict.Remove(key);

            AuthTypeCacheItem item = new AuthTypeCacheItem();

            item.AuthTypeEnum = authType;

            item.ExpireDateTime = DateTime.Now.AddMinutes(basicExipreMinutes + rd.Next(-5, 5));

            this.dict.Add(key, item);

        }



    }

}