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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using XenAdmin.Dialogs;
using XenAdmin.Controls;
using XenAdmin.Wizards.BallooningWizard_Pages;
using XenAPI;

namespace XenAdmin.Wizards
{
    public partial class BallooningWizard : XenWizardBase
    {
        private readonly ChooseVMs xenTabPageVMs;
        private readonly MemorySettings xenTabPageSettings;
        
        private long origStaticMax;
        private bool has_ballooning;

        public BallooningWizard(List<VM> vms)
            : base(vms[0].Connection)
        {
            InitializeComponent();

            xenTabPageVMs = new ChooseVMs();
            xenTabPageSettings = new MemorySettings();

            xenTabPageVMs.VMs = vms;
            AddPage(xenTabPageVMs);
            AddPage(xenTabPageSettings);

            if (vms.Count == 1)  // if there is only one VM, don't offer a choice
            {
                xenTabPageVMs.DisableStep = true;
                NextStep();
            }

            origStaticMax = vms[0].memory_static_max;
            has_ballooning = vms[0].has_ballooning();
        }

        protected override void OnShown(EventArgs e)
        {
            UpdateWizard();
            base.OnShown(e);
        }

        protected override void UpdateWizardContent(XenTabPage senderPage)
        {
            if (senderPage.GetType() == typeof(ChooseVMs))
                xenTabPageSettings.VMs = xenTabPageVMs.CheckedVMs;
        }

        protected override void FinishWizard()
        {
            xenTabPageSettings.UnfocusSpinners();
            bool canCloseWizard = BallooningDialog.ConfirmAndChange(this, xenTabPageVMs.CheckedVMs,
                has_ballooning ? (long)xenTabPageSettings.dynamic_min : (long)xenTabPageSettings.static_max,
                // dynamic_min and _max should stay equal to static_max for VMs without ballooning
                has_ballooning ? (long)xenTabPageSettings.dynamic_max : (long)xenTabPageSettings.static_max,
                (long)xenTabPageSettings.static_max, origStaticMax, xenTabPageSettings.AdvancedMode);
            if (canCloseWizard)
                base.FinishWizard();
            else
                FinishCanceled();
        }
        
        private void xenTabPageSettings_InstallTools(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}