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using System.Collections.Generic;
using System.Linq;
using XenAdmin.Core;

namespace XenAPI
{
    public partial class VM_appliance
    {
        public override string Name()
        {
            return name_label;
        }

        public override string Description()
        {
            return name_description;
        }

        public List<VM> GetFateSharingVMs()
        {
            //find VMs that do not belong in this appliance
            var vmsNotInCurApp = from VM vm in this.Connection.Cache.VMs
                                 where vm.appliance != this.opaque_ref
                                 select vm;

            var fateSharingVms = new List<VM>();

            foreach (var vmRef in this.VMs)
            {
                VM thisVm = this.Connection.Resolve(vmRef);
                if (thisVm == null)
                    continue;

                foreach (var otherVm in vmsNotInCurApp)
                {
                    if (otherVm.is_a_real_vm() && otherVm.power_state != vm_power_state.Halted && otherVm.SRs().Intersect(thisVm.SRs()).FirstOrDefault() != null && !fateSharingVms.Contains(otherVm))
                        fateSharingVms.Add(otherVm);
                }
            }

            return fateSharingVms;
        }

        public bool IsRunning()
        {
            foreach (var vmRef in VMs)
            {
                VM vm = Connection.Resolve(vmRef);
                if (vm == null)
                    continue;

                if (vm.power_state == vm_power_state.Running
                    || vm.power_state == vm_power_state.Paused
                    || vm.power_state == vm_power_state.Suspended)
                    return true;
            }
            return false;
        }

        public static List<XenRef<SR>> GetDRMissingSRs(Session session, string vm, Session sessionTo)
        {
            return Helpers.CreedenceOrGreater(sessionTo.Connection)
                       ? VM_appliance.get_SRs_required_for_recovery(session, vm, sessionTo.uuid)
                       : null;
        }
    }
}