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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, String description)
            : base(connection, description)
        {
            this._vms = vms;
        }

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

        protected override void RunWithSession(ref Session session)
        {
            List<VM> vmObjs = new List<VM>();
            foreach (XenRef<VM> vm in _vms)
                vmObjs.Add(Connection.TryResolveWithTimeout(vm));

            PBD.CheckAndPlugPBDsFor(vmObjs);

            int vmCount = _vms.Count;
            int i = 0;

            foreach (VM vm in vmObjs)
            {
                XenRef<Task> task = DoPerVM(session, vm);

                try
                {
                    PollTaskForResult(Connection, ref session, task, delegate(int progress)
                                                                                                 {
                                                                                                     PercentComplete = (progress / vmCount) + ((100 * i) / vmCount);
                                                                                                 });

                    i++;
                }
                finally
                {
                    Task.destroy(session, task);
                }
            }
        }
    }
}