/* Copyright (c) Cloud Software Group, Inc. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
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 * *   Redistributions of source code must retain the above 
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 *     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 
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 */

using System.Linq;
using XenAdmin.Controls;
using XenAdmin.Wizards.GenericPages;
using XenAPI;

namespace XenAdmin.Wizards.CrossPoolMigrateWizard
{
    class CrossPoolMigrateNetworkingPage : SelectMultipleVMNetworkPage
    {
        private readonly bool templatesOnly;
        private readonly WizardMode wizardMode;

        public CrossPoolMigrateNetworkingPage(bool templatesOnly, WizardMode wizardMode)
        {
            this.templatesOnly = templatesOnly;
            this.wizardMode = wizardMode;
        }
        
        /// <summary>
        /// Gets the page's title (headline)
        /// </summary>
        public override string PageTitle => Messages.CPM_WIZARD_SELECT_NETWORK_PAGE_TITLE;

        /// <summary>
        /// Gets the page's label in the (left hand side) wizard progress panel
        /// </summary>
        public override string Text => Messages.CPM_WIZARD_SELECT_NETWORK_PAGE_TEXT;

        protected override string IntroductionText
        {
            get 
            {
                if (templatesOnly)
                {
                    return VmMappings != null && VmMappings.Count > 1
                        ? Messages.CPM_WIZARD_NETWORKING_INTRO_TEMPLATE
                        : Messages.CPM_WIZARD_NETWORKING_INTRO_TEMPLATE_SINGLE;
                }
                else
                {
                    return VmMappings != null && VmMappings.Count > 1
                        ? Messages.CPM_WIZARD_NETWORKING_INTRO
                        : Messages.CPM_WIZARD_NETWORKING_INTRO_SINGLE;
                }
            }
        }

        protected override string TableIntroductionText => Messages.CPM_WIZARD_VM_SELECTION_INTRODUCTION;

        /// <summary>
        /// Gets the value by which the help files section for this page is identified
        /// </summary>
        public override string HelpID => wizardMode == WizardMode.Copy ? "NetworkingCopyMode" : "Networking";

        protected override NetworkResourceContainer NetworkData(string sysId)
        {
            var vm = Connection.Resolve(new XenRef<VM>(sysId));

            if (vm == null)
                return null;

            var vifs = Connection.ResolveAll(vm.VIFs);
            var macs = vifs.Select(v => v.MAC);

            var snapVIFs = vm.snapshots
                .Select(vm.Connection.Resolve)
                .SelectMany(s => Connection.ResolveAll(s.VIFs))
                .Where(v => !macs.Contains(v.MAC))
                .ToList();

            vifs.AddRange(snapVIFs);

            return new CrossPoolMigrationNetworkResourceContainer(vifs);
        }

        protected override bool AllowSriovNetwork(XenAPI.Network network, string sysId)
        {
            if (sysId == null)
                return false;

            VM vm = Connection.Resolve(new XenRef<VM>(sysId));
            if (vm == null)
                return false;

            if (vm.power_state != vm_power_state.Halted)
                return false;

            return vm.HasSriovRecommendation();
        }

        protected override void PageLeaveCore(PageLoadedDirection direction, ref bool cancel)
        {
            if (!CrossPoolMigrateWizard.AllVMsAvailable(VmMappings, Connection))
            {
                cancel = true;
                SetButtonNextEnabled(false);
                SetButtonPreviousEnabled(false);
            }
        }

        protected override string NetworkColumnHeaderText =>
            templatesOnly
                ? Messages.CPS_WIZARD_NETWORKING_NETWORK_COLUMN_TEMPLATE
                : Messages.CPS_WIZARD_NETWORKING_NETWORK_COLUMN_VM;
    }
}