/* Copyright (c) Citrix Systems Inc. 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Net;
using XenAdmin.Model;
using XenAPI;

namespace XenAdmin.Actions
{
    public class SaveHealthCheckSettingsAction : PureAsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private readonly Pool pool;
        HealthCheckSettings healthCheckSettings;
        private string authenticationToken;
        private string diagnosticToken;
        private string username;
        private string password;

        public SaveHealthCheckSettingsAction(Pool pool, HealthCheckSettings healthCheckSettings, string authenticationToken, string diagnosticToken, string userName, string passWord, bool suppressHistory)
            : base(pool.Connection, Messages.ACTION_SAVE_HEALTHCHECK_SETTINGS, string.Format(Messages.ACTION_SAVING_HEALTHCHECK_SETTINGS, pool.Name), suppressHistory)
        {
            this.pool = pool;
            this.healthCheckSettings = healthCheckSettings;
            this.authenticationToken = authenticationToken;
            this.diagnosticToken = diagnosticToken;
            this.username = healthCheckSettings.Status == HealthCheckStatus.Enabled ? userName : null;
            this.password = healthCheckSettings.Status == HealthCheckStatus.Enabled ? passWord : null;
        }
        
        protected override void Run()
        {
            Dictionary<string, string> newConfig = healthCheckSettings.ToDictionary(pool.health_check_config);
            if (!string.IsNullOrEmpty(authenticationToken))
            {
                log.Info("Saving upload token as xapi secret"); 
                SetSecretInfo(Session, newConfig, HealthCheckSettings.UPLOAD_TOKEN_SECRET, authenticationToken);
            }
            if (!string.IsNullOrEmpty(diagnosticToken))
            {
                log.Info("Saving diagnostic token as xapi secret"); 
                SetSecretInfo(Session, newConfig, HealthCheckSettings.DIAGNOSTIC_TOKEN_SECRET, diagnosticToken);
            }
            SetSecretInfo(Session, newConfig, HealthCheckSettings.UPLOAD_CREDENTIAL_USER_SECRET, username);
            SetSecretInfo(Session, newConfig, HealthCheckSettings.UPLOAD_CREDENTIAL_PASSWORD_SECRET, password);
            Pool.set_health_check_config(Session, pool.opaque_ref, newConfig);
        }

        public static void SetSecretInfo(Session session, Dictionary<string, string> config, string infoKey, string infoValue)
        {
            if (string.IsNullOrEmpty(infoKey))
                return;

            if (infoValue == null)
            {
                if (config.ContainsKey(infoKey))
                {
                    TryToDestroySecret(session, config[infoKey]);
                    config.Remove(infoKey);
                }
            }
            else if (config.ContainsKey(infoKey))
            {
                try
                {
                    string secretRef = Secret.get_by_uuid(session, config[infoKey]);
                    Secret.set_value(session, secretRef, infoValue);
                }
                catch (Failure)
                {
                    config[infoKey] = Secret.CreateSecret(session, infoValue);
                }
                catch (WebException)
                {
                    config[infoKey] = Secret.CreateSecret(session, infoValue);
                }
            }
            else
            {
                config[infoKey] = Secret.CreateSecret(session, infoValue);
            }
        }

        private static void TryToDestroySecret(Session session, string secret_uuid)
        {
            try
            {
                var secret = Secret.get_by_uuid(session, secret_uuid);
                Secret.destroy(session, secret.opaque_ref);
                log.DebugFormat("Successfully destroyed secret {0}", secret_uuid);
            }
            catch (Exception exn)
            {
                log.Error(string.Format("Failed to destroy secret {0}", secret_uuid), exn);
            }
        }
    }
}