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using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Commands;
using XenAdmin.Network;
using XenAPI;

namespace XenAdmin.Dialogs
{
    public class VDIMigrateDialog : MoveVirtualDiskDialog
    {
        private readonly List<VDI> vdis;
        public VDIMigrateDialog(IXenConnection connection, List<VDI> vdis) : base(connection)
        {
            this.vdis = vdis;
            SRPicker.DiskSize = vdis.Sum(d => d.physical_utilisation);
            SRPicker.SetUsageAsMigrateVDI(vdis.ToArray());
            SRPicker.SrHint.Text = Messages.MIGRATE_VDI_DIALOG_SRHINT;
            SRPicker.Connection = connection;
            SetupEventHandlers();
        }

        public SR SelectedSR
        {
            get { return SRPicker.SR; }
        }

        protected override void buttonMove_Click(object sender, EventArgs e)
        {
            CreateAndRunParallelActions();
            DialogResult = DialogResult.OK;
            Close();
        }

        private void CreateAndRunParallelActions()
        {
            BatchingMigrateVirtualDiskManager manager = 
                new BatchingMigrateVirtualDiskManager(connection);

            if (VdisToMigrate().Count > 0 )
                manager.BatchAs(BatchingMigrateVirtualDiskManager.Batching.VdiMigrate, 
                                VdisToMigrate(), SelectedSR).RunAsync();

            if (VdisToMove().Count > 0)
                manager.BatchAs(BatchingMigrateVirtualDiskManager.Batching.VdiMove, 
                                VdisToMove(), SelectedSR).RunAsync();
        }

        private List<VDI> VdisToMove()
        {
           return (from vdi in vdis
                   let moveCmd = new MoveVirtualDiskCommand(Program.MainWindow, vdi)
                   where moveCmd.CanExecute()
                   select vdi).ToList();
        }

        private List<VDI> VdisToMigrate()
        {
            return (from vdi in vdis
                    let cmd = new MigrateVirtualDiskCommand(Program.MainWindow, vdi)
                    where cmd.CanExecute()
                    select vdi).ToList();
        }

        internal override string HelpName
        {
            get { return "VDIMigrateDialog"; }
        }
    }
}