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using System;
using XenAdmin.Network;
using XenAPI;


namespace XenAdmin.Actions
{
    /// <summary>
    /// Change the ISO image attached to a VBD in a VM
    /// </summary>
    public class ChangeVMISOAction : PureAsyncAction
    {
        private readonly VBD cdrom;
        private readonly VDI vdi;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="vm"></param>
        /// <param name="vdi">May be null, indicating that the CD should be ejected (i.e. set to empty).</param>
        /// <param name="cdrom">Must not be null.</param>
        public ChangeVMISOAction(IXenConnection connection, VM vm,
            VDI vdi, VBD cdrom)
            : base(connection, vdi == null ? String.Format(Messages.ISO_UNLOADING, vm.Name()) :
            String.Format(Messages.ISO_LOADING, vdi.Name(), vm.Name()))
        {
            this.VM = vm;
            this.vdi = vdi;
            this.cdrom = cdrom;

            System.Diagnostics.Trace.Assert(this.cdrom != null, "ChangeVMISOAction ctor: cdrom vbd must not be null");
            System.Diagnostics.Trace.Assert(this.VM != null, "ChangeVMISOAction ctor: VM must not be null");
        }

        protected override void Run()
        {
            bool wasEmpty = false;

            if (!cdrom.empty)
            {
                RelatedTask = VBD.async_eject(Session, cdrom.opaque_ref);
                wasEmpty = true;
                PollToCompletion(0, 50);
            }

            if (vdi != null)
            {
                RelatedTask = VBD.async_insert(Session, cdrom.opaque_ref, vdi.opaque_ref);
                PollToCompletion(wasEmpty ? 50 : 0, 100);
                Description = String.Format(Messages.ISO_LOADED,
                    vdi.Name(), VM.Name());
            }
            else
            {
                Description = String.Format(Messages.ISO_UNLOADED,
                    VM.Name());
            }
        }
    }
}