/* 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 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using XenAdmin.Core;
using XenAdmin.Model;

namespace XenAPI
{
    public partial class Pool : IComparable<Pool>, IEquatable<Pool>
    {
        public override string ToString()
        {
            return Name;
        }

        public override string Description
        {
            get
            {
                return name_description;
            }
        }


        public override string Name
        {
            get
            {
                if (name_label != "")
                    return name_label;

                if (Connection == null)
                    return string.Empty;
                
                Host master = Connection.Resolve(this.master);
                return master == null ? "" : master.Name;
            }
        }

        internal override string LocationString
        {
            get
            {
                return string.Empty;
            }
        }

        public List<SR> GetHAHeartbeatSRs()
        {
            List<SR> result = new List<SR>();

            foreach (string opaqueRef in ha_statefiles)
            {
                XenRef<VDI> vdiRef = new XenRef<VDI>(opaqueRef);
                VDI vdi = Connection.Resolve(vdiRef);
                if (vdi == null)
                    continue;
                SR sr = vdi.Connection.Resolve(vdi.SR);
                if (sr != null)
                    result.Add(sr);
            }

            return result;
        }

        public bool IsMasterUpgraded
        {
            get
            {
                Host master = Helpers.GetMaster(this);
                foreach (var host in this.Connection.Cache.Hosts)
                {
                    if (host.LongProductVersion != master.LongProductVersion)
                        return true;
                }
                return false;
            }
        }

        public string LicenseString
        {
            get
            {
                if (Helpers.MidnightRideOrGreater(Connection))
                {
                    var hosts = new List<Host>(Connection.Cache.Hosts);
                    foreach (Host.Edition edition in Enum.GetValues(typeof(Host.Edition)))
                    {
                        Host.Edition edition1 = edition;
                        Host host = hosts.Find(h => h.edition == Host.GetEditionText(edition1));

                        if (host != null)
                        {
                            return Helpers.GetFriendlyLicenseName(host);
                        }
                    }
                    return PropertyManager.GetFriendlyName("Label-host.edition-free");
                }
                else
                {
                    Host lowestLicenseHost = null;
                    string lowestLicense = "";
                    foreach (Host host in this.Connection.Cache.Hosts)
                    {
                        string sku = host.license_params.ContainsKey("sku_type") ? host.license_params["sku_type"].Replace(" ", "_").ToLowerInvariant() : "xe_express";

                        //Express
                        if (sku.EndsWith("xe_express"))
                        {
                            lowestLicenseHost = host;
                            lowestLicense = sku;
                            break;
                        }

                        // Server
                        if (sku.EndsWith("xe_server") && lowestLicense.EndsWith("xe_enterprise"))
                        {
                            lowestLicenseHost = host;
                            lowestLicense = sku;
                        }

                        // Enterprise
                        if (lowestLicense == "")
                        {
                            lowestLicenseHost = host;
                            lowestLicense = sku;
                        }
                    }
                    if (lowestLicense.EndsWith("xe_express"))
                    {
                        return PropertyManager.GetFriendlyName("Label-host.sku_type-FG-xe_express");
                    }
                    else
                    {
                        return Helpers.GetFriendlyLicenseName(lowestLicenseHost);
                    }
                }
            }
        }
        /// <summary>
        /// Determine whether the given pool is a visible pool, i.e. not a pool-of-one.
        /// </summary>
        /// <param name="ThePool"></param>
        /// <returns></returns>
        public bool IsVisible
        {
            get
            {
                return Connection != null && (name_label != "" || Connection.Cache.HostCount > 1);
            }
        }

        private const String ROLLING_UPGRADE_IN_PROGRESS = "rolling_upgrade_in_progress";

        public bool RollingUpgrade
        {
            get
            {
                return other_config != null && other_config.ContainsKey(ROLLING_UPGRADE_IN_PROGRESS);
            }
        }

        public static Dictionary<string, string> retrieve_wlb_default_configuration(Session session)
        {
            return Maps.convert_from_proxy_string_string(session.proxy.pool_retrieve_wlb_configuration("default").parse());
        }

        public string GetXCPluginSecret(string plugin_name, IXenObject obj)
        {
            return Get(gui_config, XCPluginSecretName(plugin_name, obj));
        }

        public void RemoveXCPluginSecret(Session session, string plugin_name, IXenObject obj)
        {
            Pool.remove_from_gui_config(session, opaque_ref, XCPluginSecretName(plugin_name, obj));
        }

        public void SetXCPluginSecret(Session session, string plugin_name, IXenObject obj, string secret_uuid)
        {
            string n = XCPluginSecretName(plugin_name, obj);
            Pool.remove_from_gui_config(session, opaque_ref, n);
            Pool.add_to_gui_config(session, opaque_ref, n, secret_uuid);
        }

        private string XCPluginSecretName(string plugin_name, IXenObject obj)
        {
            return string.Format("XC_PLUGIN_SECRET_{0}_{1}_{2}", obj.Connection.Username, plugin_name, Helpers.GetUuid(obj));
        }

        public void ClearStorageLinkCredentials()
        {
            var otherConfig = new Dictionary<string, string>(other_config);

            otherConfig.Remove("storagelink_host");
            otherConfig.Remove("storagelink_user");
            otherConfig.Remove("storagelink_password_secret");
            Pool.set_other_config(Connection.Session, opaque_ref, otherConfig);
        }

        public void SetStorageLinkCredentials(string host, string username, string password)
        {
            var otherConfig = new Dictionary<string, string>(other_config);

            if (host == null)
            {
                otherConfig.Remove("storagelink_host");
            }
            else
            {
                otherConfig["storagelink_host"] = host;
            }

            if (username == null)
            {
                otherConfig.Remove("storagelink_user");
            }
            else
            {
                otherConfig["storagelink_user"] = username;
            }

            if (password == null)
            {
                otherConfig.Remove("storagelink_password_secret");
            }
            else if (otherConfig.ContainsKey("storagelink_password_secret"))
            {
                try
                {
                    string secretRef = Secret.get_by_uuid(Connection.Session, otherConfig["storagelink_password_secret"]);
                    Secret.set_value(Connection.Session, secretRef, password);
                }
                catch (Failure)
                {
                    otherConfig["storagelink_password_secret"] = Secret.CreateSecret(Connection.Session, password);
                }
                catch (WebException)
                {
                    otherConfig["storagelink_password_secret"] = Secret.CreateSecret(Connection.Session, password);
                }
            }
            else
            {
                otherConfig["storagelink_password_secret"] = Secret.CreateSecret(Connection.Session, password);
            }

            Pool.set_other_config(Connection.Session, opaque_ref, otherConfig);
        }

        public string StorageLinkHost
        {
            get
            {
                string host;
                other_config.TryGetValue("storagelink_host", out host);
                return host;
            }
        }

        public string StorageLinkUsername
        {
            get
            {
                string user;
                other_config.TryGetValue("storagelink_user", out user);
                return user;
            }
        }

        public StorageLinkCredentials GetStorageLinkCredentials()
        {
            if (other_config != null && Helpers.MidnightRideOrGreater(Connection) && !Helpers.BostonOrGreater(Connection))
            {
                var otherConfig = new Dictionary<string, string>(other_config);
                string host, user, passwordSecret;
                otherConfig.TryGetValue("storagelink_host", out host);
                otherConfig.TryGetValue("storagelink_user", out user);
                otherConfig.TryGetValue("storagelink_password_secret", out passwordSecret);

                return new StorageLinkCredentials(Connection, host, user, null, passwordSecret);
            }
            return null;
        }

        // Whether the vSwitch Controller appears to be configured.
        // (Note that we can't tell whether it's actually working properly through the API).
        public bool vSwitchController
        {
            get
            {
                if (string.IsNullOrEmpty(vswitch_controller))
                    return false;

                foreach (Host h in Connection.Cache.Hosts)
                {
                    if (!Helpers.CowleyOrGreater(h) ||
                        Host.RestrictVSwitchController(h) ||
                        !h.software_version.ContainsKey("network_backend") ||
                        h.software_version["network_backend"] != "openvswitch")
                    {
                        return false;
                    }
                }

                return true;
            }
        }

        public List<XenAPI.Host> HostsToUpgrade
        {
            get
            {
                //First one to upgrade has to be the master
                var master = Helpers.GetMaster(Connection);

                List<XenAPI.Host> result = IsMasterUpgraded
                               ? Connection.Cache.Hosts.Where(host => host.LongProductVersion != master.LongProductVersion).ToList()
                               : Connection.Cache.Hosts.ToList();
                result.Sort();
                
                return result;
            }
        }

        public bool IsPoolFullyUpgraded
        {
            get
            {
                Host master = Helpers.GetMaster(this);

                foreach (var host in this.Connection.Cache.Hosts)
                {
                    if (host.LongProductVersion != master.LongProductVersion)
                        return false;
                }
                return true;
            }
        }

        public Host SmallerVersionHost
        {
            get
            {
                Host hostWithSmallerVersion = null;
                foreach (var host in this.Connection.Cache.Hosts)
                {
                    if (hostWithSmallerVersion == null)
                        hostWithSmallerVersion = host;
                    else if (Helpers.productVersionCompare(hostWithSmallerVersion.ProductVersion, host.ProductVersion) > 0)
                        hostWithSmallerVersion = host;
                }
                return hostWithSmallerVersion;
            }
        }

        public virtual int CpuSockets
        {
            get { return Connection.Cache.Hosts.Sum(h => h.CpuSockets); }
        }

        public bool HasGpu
        {
            get { return Connection.Cache.PGPUs.Length > 0; }
        }

        public bool HasVGpu
        {
            get { return HasGpu && Connection.Cache.PGPUs.Any(pGpu => pGpu.HasVGpu); }
        }

        /// <summary>
        /// ssl_legacy is true if any host in the pool is in legacy mode
        /// </summary>
        public bool ssl_legacy
        {
            get { return Connection.Cache.Hosts.Any(h => h.ssl_legacy);  }
        }

        #region Health Check settings
        public HealthCheckSettings HealthCheckSettings
        {
            get 
            {
               return new HealthCheckSettings(health_check_config);
            }
        }
        #endregion

        #region IEquatable<Pool> Members

        /// <summary>
        /// Indicates whether the current object is equal to the specified object. This calls the implementation from XenObject.
        /// This implementation is required for ToStringWrapper.
        /// </summary>
        public bool Equals(Pool other)
        {
            return base.Equals(other);
        }

        #endregion
    }
}