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using System;
using System.Collections.Generic;
using XenAdmin.Wizards.GenericPages;
using XenAPI;

namespace XenAdmin.Wizards.CrossPoolMigrateWizard
{

    public class CrossPoolMigrationStorageResourceContainer : StorageResourceContainer
    {
        private readonly List<VDI> vdis;
        private int currentLoc;

        public CrossPoolMigrationStorageResourceContainer(List<VDI> vdis)
        {
            this.vdis = vdis;
        }

        public override IStorageResource Next()
        {
            IStorageResource res = new CrossPoolMigrationStorageResource(vdis[currentLoc]);
            currentLoc++;
            return res;
        }

        public override bool IsNext
        {
            get 
            { 
                return currentLoc < vdis.Count;
            }
        }
    }

    public class CrossPoolMigrationStorageResource : IStorageResource
    {
        private readonly VDI vdi;
        private readonly SR sr;

        public CrossPoolMigrationStorageResource(VDI vdi)
        {
            this.vdi = vdi;
            sr = vdi.Connection.Cache.Resolve(vdi.SR);
        }

        public string DiskLabel => vdi.Name();
        public object Tag => vdi.opaque_ref;
        public bool SRTypeInvalid => false;
        public SR SR => sr;

        public bool TryCalcRequiredDiskCapacity(out ulong capacity)
        {
            capacity = Convert.ToUInt64(vdi.physical_utilisation);
            return true;
        }
    }
}