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

namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    public abstract class VMsPlanAction : PlanActionWithSession
    {
        private readonly List<XenRef<VM>> _vms;

        protected VMsPlanAction(List<XenRef<VM>> vms, IXenConnection connection)
            : base(connection)
        {
            this._vms = vms;
        }

        protected abstract XenRef<Task> DoPerVM(Session session, XenRef<VM> vmRef);

        protected override void RunWithSession(ref Session session)
        {
            PBD.CheckPlugPBDsForVMs(Connection, _vms);

            int vmCount = _vms.Count;

            for (int i = 0; i < _vms.Count; i++)
            {
                var vmRef = _vms[i];
                XenRef<Task> task = DoPerVM(session, vmRef);

                try
                {
                    var j = i;
                    PollTaskForResult(Connection, ref session, task,
                        progress => PercentComplete = (progress + 100 * j) / vmCount);
                }
                finally
                {
                    Task.destroy(session, task);
                }
            }
        }
    }
}