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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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 */

using System;
using System.Collections.Generic;
using System.Xml;
using XenAdmin.Network;
using XenAPI;
using XenAdmin.Core;


namespace XenAdmin.Actions
{
    /// <summary>
    /// Used for scanning for CSLG servers
    /// </summary>
    public abstract class SrCslgScanAction : AsyncAction
    {
        private readonly string _hostname;
        private readonly string _username;
        private readonly string _passwordSecret;

        protected SrCslgScanAction(IXenConnection connection, string hostname, string username, string passwordSecret)
            : base(connection, string.Format(Messages.ACTION_SR_SCAN_NAME_CSLG, hostname), string.Format(Messages.ACTION_SR_SCAN_NAME_CSLG, hostname), true)
        {
            _hostname = hostname ?? throw new ArgumentNullException(nameof(hostname));
            _username = username ?? throw new ArgumentNullException(nameof(username));
            _passwordSecret = passwordSecret;

            ApiMethodsToRoleCheck.AddRange(
                "SR.async_probe",
                "Secret.create",
                "Secret.get_by_uuid",
                "Secret.get_uuid",
                "Secret.destroy");
        }

        protected void RunProbe(Dictionary<string, string> dconf)
        {
            // CA-40132 create a new secret based on the secret that was passed in to the constructor. This is required so that the
            // server doesn't associate the secret with a particular SR and then delete it when the SR is detached.         
            string newPasswordSecret = Secret.CreateSecret(Session, _passwordSecret);

            dconf["password_secret"] = newPasswordSecret;
            try
            {
                RelatedTask = SR.async_probe(Session, Helpers.GetCoordinator(Connection).opaque_ref, dconf, SR.SRTypes.cslg.ToString(), new Dictionary<string, string>());
                PollToCompletion();
            }
            finally
            {
                // now destroy the secret.
                if (!string.IsNullOrEmpty(newPasswordSecret))
                {
                    string newSecretRef = Secret.get_by_uuid(Session, newPasswordSecret);
                    Secret.destroy(Session, newSecretRef);
                }
            }
        }

        protected Dictionary<string, string> GetAuthenticationDeviceConfig()
        {
            return new Dictionary<string, string>
            {
                { "target", _hostname },
                { "username", _username },
                { "password_secret", _passwordSecret }
            };
        }

        protected string GetXmlNodeInnerText(XmlNode node, string xPath)
        {
            Util.ThrowIfParameterNull(node, "node");
            Util.ThrowIfStringParameterNullOrEmpty(xPath, "xPath");

            XmlNodeList nodes = node.SelectNodes(xPath);

            if (nodes == null || nodes.Count == 0)
            {
                throw new InvalidOperationException(string.Format(Messages.CANNOT_FIND_NODE, xPath));
            }

            return nodes[0].InnerText;
        }

        protected List<string> GetXmlChildNodeInnerTexts(XmlNode node, string xPath)
        {
            Util.ThrowIfParameterNull(node, "node");
            Util.ThrowIfStringParameterNullOrEmpty(xPath, "xPath");

            List<string> output = new List<string>();
            XmlNodeList nodes = node.SelectNodes(xPath);

            if (nodes == null)
            {
                throw new InvalidOperationException(string.Format(Messages.CANNOT_FIND_NODE, xPath));
            }

            foreach (XmlNode n in nodes)
            {
                output.Add(n.InnerText);
            }

            return output;
        }
    }
}