/* 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 
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
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 * 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 Network : IComparable<Network>, IEquatable<Network>
    {
        public const string CREATE_IN_PROGRESS = "XenCenterCreateInProgress";
        public const long MTU_MIN = 1500;
        public const long MTU_DEFAULT = 1500;
        public const long MTU_MAX = 9216;


        public override string Description
        {
            get
            {
                return name_description;
            }
        }
        /// <returns>A friendly name for the network.</returns>
        public override string Name
        {
            get
            {
                // Return the name_label, if its been changed by the user, or Network n where n is the
                // device number otherwise.  Take the device from the pool master by default, or from
                // the first one we find otherwise.  If it's not attached anywhere, then give up and
                // return the name_label, which will be in the default form.

                if (name_label == "Host internal management network")
                    return Messages.HOST_INTERNAL_MANAGEMENT_NETWORK;

                if (!name_label.StartsWith("Network associated with ") &&
                    !name_label.StartsWith("Pool-wide network associated with "))
                {
                    return name_label;
                }

                Pool pool = Helpers.GetPoolOfOne(Connection);
                if (pool == null)
                    return name_label;

                string master_ref = pool.master.opaque_ref;

                foreach (PIF pif in Connection.ResolveAll(PIFs))
                {
                    if (pif.host.opaque_ref == master_ref)
                    {
                        return PIFName(pif);
                    }
                }

                foreach (PIF pif in Connection.ResolveAll(PIFs))
                {
                    return PIFName(pif);
                }

                return name_label;
            }
        }

        public bool AllHostsCanSeeNetwork
        {
            get
            {
                foreach (Host host in Connection.Cache.Hosts)
                {
                    if (!host.CanSeeNetwork(this))
                        return false;
                }

                return true;
            }
        }

        public override string ToString()
        {
            return Name;
        }

        private string PIFName(PIF pif)
        {
            bool bond;
            return string.Format(Messages.NETWORK_NAME, pif.NICIdentifier(out bond));
        }

        public bool AutoPlug
        {
            get
            {
                // Note that this is not equivalent to BoolKey, because here
                // absence of the key gives AutoPlug=true, not false.
                return Get(other_config, "automatic") != "false";
            }

            set
            {
                Changed |= AutoPlug != value;
                set_other_config("automatic", value ? "true" : "false");
            }
        }

        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);
            new_other_config[key] = value;
            other_config = new_other_config;
        }

        public override bool Show(bool showHiddenVMs)
        {
            
                if (IsGuestInstallerNetwork)
                    return false;

                if (showHiddenVMs)
                    return true;

                if (!ShowAllPifs(showHiddenVMs))
                    return false;

                if (IsSlave)
                    return false;

                return !IsHidden;
            
        }

        /// <summary>
        /// Returns whether the other_config.HideFromXenCenter flag is set to true.
        /// </summary>
        public override bool IsHidden
        {
            get
            {
                return BoolKey(other_config, HIDE_FROM_XENCENTER); 
            }
        }

        public bool CreateInProgress
        {
            get
            {
                return BoolKey(other_config, CREATE_IN_PROGRESS);
            }
        }

        public bool IsGuestInstallerNetwork
        {
            get
            {
                return BoolKey(other_config, "is_guest_installer_network");
            }
        }

        /// <summary>
        /// Return true if the given network represents a bond, i.e. it has a PIF with
        /// IsBondNIC == true.
        /// </summary>
        public bool IsBond
        {
            get
            {
                return TheBonds.Count > 0;
            }
        }

        public List<XenRef<Bond>> TheBonds
        {
            get
            {
                var ans = new List<XenRef<Bond>>();
                foreach (PIF pif in Connection.ResolveAll(PIFs))
                {
                    if (pif.IsBondNIC)
                        ans.Add(pif.bond_master_of[0]);
                }
                return ans;
            }
        }

        public bool IsSlave
        {
            get
            {
                if (Connection == null)
                    return false;
                foreach (PIF pif in Connection.ResolveAll(PIFs))
                {
                    if (pif.IsBondSlave)
                        return true;
                }
                return false;
            }
        }

        public bool IsInUseBondSlave
        {
            get
            {
                if (Connection == null)
                    return false;
                foreach (PIF pif in Connection.ResolveAll(PIFs))
                {
                    if (pif.IsInUseBondSlave)
                        return true;
                }
                return false;
            }
        }

        private bool ShowAllPifs(bool showHiddenVMs)
        {
            if (Connection == null)
                return true;

            foreach (PIF pif in Connection.ResolveAll(PIFs))
            {
                if (!pif.Show(showHiddenVMs))
                {
                    return false;
                }
            }
            return true;
        }

        public bool HasActiveVIFs
        {
            get
            {
                if (Connection == null)
                    return false;
                foreach (VIF vif in Connection.ResolveAll(VIFs))
                {
                    if (vif.currently_attached)
                        return true;
                }
                return false;
            }
        }

        /// <summary>
        /// Do not use for new networks, perform checks by hand:
        /// No jumbo frames on CHINs
        /// No jumbo frames pre Cowley
        /// </summary>
        public bool CanUseJumboFrames
        {
            get 
            {
                if (Connection == null)
                    return false;

                if (!Helpers.CowleyOrGreater(Connection))
                    return false;

                // not supported on CHINs
                if (Connection.ResolveAll<PIF>(PIFs).Find(delegate(PIF p) { return p.IsTunnelAccessPIF; }) != null)
                    return false;

                return true;
            }
        }

        public string LinkStatusString
        {
            get
            {
                if (PIFs.Count == 0)
                    return Messages.SPACED_HYPHEN;

                List<PIF.LinkState> states = new List<PIF.LinkState>();
                foreach (PIF p in Connection.ResolveAll<PIF>(PIFs))
                    states.Add(p.LinkStatus);

                bool Connected = states.Contains(PIF.LinkState.Connected);
                bool Disconnected = states.Contains(PIF.LinkState.Disconnected);
                bool Unknown = states.Contains(PIF.LinkState.Unknown);

                if (Connected)
                {
                    if (Disconnected || Unknown)
                        return Messages.PARTIALLY_CONNECTED;
                    else
                        return Messages.CONNECTED;
                }
                else if (Disconnected)
                {
                    // "Partially disconnected" would a bit confusing as it might seem imply a known connected
                    // PIF exists - go with Unknown if we just have d/c and unknown
                    if (Unknown)
                        return Messages.UNKNOWN;
                    else
                        return Messages.DISCONNECTED;
                }
                else
                    return Messages.UNKNOWN;

            }
        }

        public bool IsVLAN
        {
            get
            {
                return Connection.ResolveAll(PIFs).Find(pif => pif.VLAN >= 0) != null;
            }
        }


        #region IEquatable<Network> 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(Network other)
        {
            return base.Equals(other);
        }

        #endregion
    }
}