/* 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 XenAdmin;
using XenAdmin.Core;


namespace XenAPI
{
    public partial class PIF : IComparable<PIF>
    {
        public override string Name
        {
            get
            {
                if (IsPhysical)
                {
                    bool bond;
                    string number = NICIdentifier(out bond);
                    return string.Format(bond ? Messages.PIF_BOND : Messages.PIF_NIC, number);
                }
                else if (IsTunnelAccessPIF)
                {
                    // In the case of tunnel access PIFs, use the name of the corresponding transport PIF (CA-63296)
                    Tunnel tunnel = Connection.Resolve(tunnel_access_PIF_of[0]);
                    PIF transport_pif = Connection.Resolve(tunnel.transport_PIF);
                    return transport_pif.Name;
                }
                else
                {
                    if (Connection == null)
                        return "";
                    VLAN vlan = Connection.Resolve(VLAN_master_of);
                    if (vlan == null)
                        return "";
                    PIF slave = Connection.Resolve(vlan.tagged_PIF);
                    if (slave == null)
                        return "";
                    return slave.Name;
                }
            }
        }

        public PIF_metrics PIFMetrics
        {
            get
            {
                return (metrics == null || Connection == null) ? null : Connection.Resolve<PIF_metrics>(metrics);
            }
        }

        // This is the name of the secondary management interface
        public string ManagementPurpose
        {
            get
            {
                return Get(other_config, "management_purpose");
            }
            set
            {
                Changed |= ManagementPurpose != value;
                set_other_config("management_purpose", value);
            }
        }

        internal string NICIdentifier(out bool is_bond)
        {
            if (bond_master_of.Count == 0)
            {
                is_bond = false;
                return device.Replace("eth", "");
            }
            else
            {
                is_bond = true;

                if (Connection == null)
                    return device;

                List<PIF> slaves = new List<PIF>();
                foreach (Bond bond in Connection.ResolveAll(bond_master_of))
                {
                    slaves.AddRange(Connection.ResolveAll(bond.slaves));
                }
                return BondSuffix(slaves);
            }
        }

        public static string BondSuffix(List<PIF> slaves)
        {
            List<string> ids = new List<string>();
            foreach (PIF slave in slaves)
            {
                ids.Add(slave.device.Replace("eth", ""));
            }
            ids.Sort();
            return string.Join("+", ids.ToArray());
        }

        public override string ToString()
        {
            return Name;
        }

        public bool IsTunnelAccessPIF
        {
            get
            {
                return tunnel_access_PIF_of != null && tunnel_access_PIF_of.Count != 0;
            }
        }

        public bool IsPhysical
        {
            get
            {
                return VLAN == -1 && !IsTunnelAccessPIF;
            }
        }

        public override int CompareTo(PIF other)
        {
            int result = this.management.CompareTo(other.management);
            if (result != 0)
                return -result;  // management PIF first

            return base.CompareTo(other);
        }

        public override bool Show(bool showHiddenVMs)
        {
            return showHiddenVMs || !IsHidden;
        }

        public override bool IsHidden
        {
            get
            {
                return BoolKey(other_config, HIDE_FROM_XENCENTER);
            }
        }

        // Whether this PIF is a management interface in the XenCenter sense.
        // Note that this is not the same as PIF.management, which only includes
        // the primary management interface. We also want all interfaces with an
        // IP address.
        public bool IsManagementInterface(bool showHiddenVMs)
        {
            return IsPrimaryManagementInterface() || IsSecondaryManagementInterface(showHiddenVMs);
        }

        public bool IsPrimaryManagementInterface()
        {
            if (!management)
                return false;

            Network nw = Connection.Resolve(network);
            return nw != null && !nw.IsGuestInstallerNetwork;
        }

        // I lied slightly above. A secondary management interface in Boston and greater
        // is one with an IP address. In Cowley and earlier, it's one where disallow_unplug
        // is set. If the interface was configured through XenCenter, both of these things
        // will be true, but if it was configured on the command line, they may not be.
        // See CA-56611 for a discussion of this.
        public bool IsSecondaryManagementInterface(bool showHiddenVMs)
        {
            if (management)
                return false;

            bool criterion =
                Helpers.BostonOrGreater(Connection) ?
                (ip_configuration_mode != ip_configuration_mode.None && ip_configuration_mode != ip_configuration_mode.unknown) :
                disallow_unplug;
            if (!criterion)
                return false;

            Network nw = Connection.Resolve(network);
            return nw != null && nw.Show(showHiddenVMs);
        }

        public string ManagementInterfaceNameOrUnknown
        {
            get
            {
                return management ? Messages.MANAGEMENT
                    : string.IsNullOrEmpty(ManagementPurpose) ? Messages.NETWORKING_PROPERTIES_PURPOSE_UNKNOWN : ManagementPurpose;
            }
        }

        public bool IsBondSlave
        {
            get { return BondSlaveOf != null; }
        }

        /// <summary>
        /// Whether this is a bond slave, and the bond master is plugged.
        /// </summary>
        public bool IsInUseBondSlave
        {
            get
            {
                Bond bond = BondSlaveOf;
                if (bond == null)
                    return false;
                PIF master = bond.Connection.Resolve(bond.master);
                if (master == null)
                    return false;
                return master.currently_attached;
            }
        }

        /// <summary>
        /// Returns the Bond of which this PIF is a slave, or null if it is not so.
        /// </summary>
        public Bond BondSlaveOf
        {
            get
            {
                return Connection == null ? null : Connection.Resolve(bond_slave_of);
            }
        }

        /// <summary>
        /// Returns the Bond of which this PIF is a master, or null if it is not so.
        /// </summary>
        public Bond BondMasterOf
        {
            get
            {
                return Connection == null || bond_master_of.Count == 0 ? null : Connection.Resolve(bond_master_of[0]);
            }
        }

        public string Speed
        {
            get
            {
                if (Connection == null)
                    return Messages.HYPHEN;
                if (IsBondNIC && !Helpers.TampaOrGreater(Connection))  // CA-67284/CA-86417
                {
                    long v = long.MaxValue;
                    foreach (Bond bond in Connection.ResolveAll<Bond>(bond_master_of))
                    {
                        foreach (PIF pif in Connection.ResolveAll<PIF>(bond.slaves))
                        {
                            PIF_metrics metrics = Connection.Resolve<PIF_metrics>(pif.metrics);
                            if (metrics == null)
                                continue;
                            if (metrics.speed < v)
                                v = metrics.speed;
                        }
                    }
                    return string.Format(Messages.NICPANEL_BIT_RATE, v);
                }
                else
                {
                    PIF_metrics metrics = Connection.Resolve<PIF_metrics>(this.metrics);
                    if (metrics == null)
                        return Messages.HYPHEN;
                    return string.Format(Messages.NICPANEL_BIT_RATE, metrics.speed);
                }
            }
        }

        public bool IsBondNIC
        {
            get
            {
                return bond_master_of.Count > 0;
            }
        }

        public string Duplex
        {
            get
            {
                if (Connection == null)
                    return Messages.HYPHEN;
                if (IsBondNIC && !Helpers.TampaOrGreater(Connection))  // CA-67284/CA-86417
                {
                    foreach (Bond bond in Connection.ResolveAll<Bond>(bond_master_of))
                    {
                        foreach (PIF pif in Connection.ResolveAll<PIF>(bond.slaves))
                        {
                            PIF_metrics metrics = Connection.Resolve<PIF_metrics>(pif.metrics);
                            if (metrics == null)
                                continue;
                            if (!metrics.duplex)
                                return Messages.NICPANEL_HALF_DUPLEX;
                        }
                    }
                    return Messages.NICPANEL_FULL_DUPLEX;
                }
                else
                {
                    PIF_metrics metrics = Connection.Resolve<PIF_metrics>(this.metrics);
                    if (metrics == null)
                        return Messages.HYPHEN;
                    return metrics.duplex ? Messages.NICPANEL_FULL_DUPLEX : Messages.NICPANEL_HALF_DUPLEX;
                }
            }
        }

        public bool Carrier
        {
            get
            {
                if (Connection == null)
                    return false;
                if (IsBondNIC && !Helpers.TampaOrGreater(Connection))  // CA-67284/CA-86417
                {
                    foreach (Bond bond in Connection.ResolveAll<Bond>(bond_master_of))
                    {
                        foreach (PIF pif in Connection.ResolveAll<PIF>(bond.slaves))
                        {
                            PIF_metrics metrics = Connection.Resolve<PIF_metrics>(pif.metrics);
                            if (metrics == null)
                                continue;
                            if (metrics.carrier)
                                return true;
                        }
                    }
                    return false;
                }
                else
                {
                    PIF_metrics metrics = Connection.Resolve<PIF_metrics>(this.metrics);
                    if (metrics == null)
                        return false;
                    return metrics.carrier;
                }
            }
        }

        void set_other_config(string key, string value)
        {
            Dictionary<string, string> new_other_config =
                other_config == null ?
                    new Dictionary<string, string>() :
                    new Dictionary<string, string>(other_config);
            if (value == null)
                new_other_config.Remove(key);
            else
                new_other_config[key] = value;
            other_config = new_other_config;
        }

        /// <summary>
        /// Returns either the IP address of the PIF, DHCP or Unknown as appropriate
        /// </summary>
        public string FriendlyIPAddress
        {
            get
            {
                if (!string.IsNullOrEmpty(IP))
                    return IP;
                switch (ip_configuration_mode)
                {
                    case ip_configuration_mode.DHCP:
                        return Messages.PIF_DHCP;
                    default:
                        return Messages.PIF_UNKNOWN;
                }
            }
        }

        public string LinkStatusString
        {
            get
            {
                switch (LinkStatus)
                {
                    case LinkState.Connected:
                        return Messages.CONNECTED;
                    case LinkState.Disconnected:
                        return Messages.DISCONNECTED;
                    case LinkState.Unknown:
                        return Messages.UNKNOWN;
                }
                return "-";
            }
        }

        public enum LinkState { Unknown, Connected, Disconnected };
        public LinkState LinkStatus
        {
            get
            {
                if (IsTunnelAccessPIF)
                {
                    Tunnel tunnel = Connection.Resolve(tunnel_access_PIF_of[0]);  // can only ever be the access PIF of one tunnel
                    Dictionary<string, string> status = (tunnel == null ? null : tunnel.status);
                    return (status != null && status.ContainsKey("active") && status["active"] == "true"
                        ? LinkState.Connected : LinkState.Disconnected);
                }

                //if (!pif.IsPhysical && !poolwide)
                //    return Messages.SPACED_HYPHEN;

                PIF_metrics metrics = PIFMetrics;
                return metrics == null ? LinkState.Unknown :
                            metrics.carrier ? LinkState.Connected :
                                                        LinkState.Disconnected;
            }
        }

        public string IpConfigurationModeString
        {
            get
            {
                switch (ip_configuration_mode)
                {
                    case ip_configuration_mode.None:
                        return Messages.PIF_NONE;
                    case ip_configuration_mode.DHCP:
                        return Messages.PIF_DHCP;
                    case ip_configuration_mode.Static:
                        return Messages.PIF_STATIC;
                    default:
                        return Messages.PIF_UNKNOWN;
                }
            }
        }
    }
}