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


namespace XenAdmin.Dialogs
{
    public partial class NewDiskDialog : XenDialogBase
    {
        #region Private fields

        private readonly VM TheVM;
        private VDI DiskTemplate;
        private readonly IEnumerable<VDI> _VDINamesInUse = new List<VDI>();

        #endregion

        #region Constructors

        public NewDiskDialog(IXenConnection connection, SR sr)
            : base(connection ?? throw new ArgumentNullException(nameof(connection)))
        {
            InitializeComponent();

            NameTextBox.Text = GetDefaultVDIName();
            diskSpinner1.Populate();
            UpdateErrorsAndButtons();
            SrListBox.PopulateAsync(SrPicker.SRPickerType.InstallFromTemplate, connection, null, sr, null);
        }

        public NewDiskDialog(IXenConnection connection, VM vm)
            : this(connection, vm, vm.Home())
        { }

        public NewDiskDialog(IXenConnection connection, VM vm, Host affinity,
            SrPicker.SRPickerType pickerUsage = SrPicker.SRPickerType.VM, VDI diskTemplate = null,
            bool canResize = true, long minSize = 0, IEnumerable<VDI> vdiNamesInUse = null)
            : base(connection ?? throw new ArgumentNullException(nameof(connection)))
        {
            InitializeComponent();

            TheVM = vm;
            _VDINamesInUse = vdiNamesInUse ?? new List<VDI>();
            diskSpinner1.CanResize = canResize;

            if (diskTemplate == null)
            {
                NameTextBox.Text = GetDefaultVDIName();
                diskSpinner1.Populate(minSize: minSize);
                UpdateErrorsAndButtons();
                SrListBox.PopulateAsync(pickerUsage, connection, affinity, null, null);
            }
            else
            {
                DiskTemplate = diskTemplate;
                NameTextBox.Text = DiskTemplate.Name();
                DescriptionTextBox.Text = DiskTemplate.Description();
                Text = Messages.EDIT_DISK;
                OkButton.Text = Messages.OK;
                diskSpinner1.Populate(DiskTemplate.virtual_size, minSize);
                UpdateErrorsAndButtons();
                SrListBox.PopulateAsync(pickerUsage, connection, affinity, connection.Resolve(DiskTemplate.SR), null);
            }
        }

        #endregion

        public bool DontCreateVDI { get; set; }

        internal override string HelpName => DiskTemplate == null ? "NewDiskDialog" : "EditNewDiskDialog";

        private string GetDefaultVDIName()
        {
            List<string> usedNames = new List<string>();
            foreach (VDI v in connection.Cache.VDIs.Concat(_VDINamesInUse))
            {
                usedNames.Add(v.Name());
            }
            return Helpers.MakeUniqueName(Messages.DEFAULT_VDI_NAME, usedNames);
        }

        private void srListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateErrorsAndButtons();
        }

        private void OkButton_Click(object sender, EventArgs e)
        {
            if (SrListBox.SR == null || NameTextBox.Text == "" || !connection.IsConnected)
                return;

            if (DontCreateVDI)
            {
                DialogResult = DialogResult.OK;
                Close();
                return;
            }
            XenAPI.SR sr = SrListBox.SR;
            if (!sr.shared && TheVM != null && TheVM.HaPriorityIsRestart())
            {
                DialogResult dialogResult;
                using (var dlg = new WarningDialog(Messages.NEW_SR_DIALOG_ATTACH_NON_SHARED_DISK_HA,
                                ThreeButtonDialog.ButtonYes, ThreeButtonDialog.ButtonNo))
                {
                    dialogResult = dlg.ShowDialog(Program.MainWindow);
                }
                if (dialogResult != DialogResult.Yes)
                    return;
                new HAUnprotectVMAction(TheVM).RunExternal(TheVM.Connection.Session);
            }

            VDI vdi = NewDisk();


            if (TheVM != null)
            {
                var alreadyHasBootableDisk = HasBootableDisk(TheVM);

                Actions.DelegatedAsyncAction action = new Actions.DelegatedAsyncAction(connection,
                    string.Format(Messages.ACTION_DISK_ADDING_TITLE, NameTextBox.Text, sr.NameWithoutHost()),
                    Messages.ACTION_DISK_ADDING, Messages.ACTION_DISK_ADDED,
                    delegate(XenAPI.Session session)
                    {
                        // Get legitimate unused userdevice numbers
                        string[] uds = XenAPI.VM.get_allowed_VBD_devices(session, TheVM.opaque_ref);
                        if (uds.Length == 0)
                        {
                            throw new Exception(FriendlyErrorNames.VBDS_MAX_ALLOWED);
                        }
                        string ud = uds[0];
                        string vdiref = VDI.create(session, vdi);
                        XenAPI.VBD vbd = NewDevice();
                        vbd.VDI = new XenAPI.XenRef<XenAPI.VDI>(vdiref);
                        vbd.VM = new XenAPI.XenRef<XenAPI.VM>(TheVM);

                        // CA-44959: only make bootable if there aren't other bootable VBDs.
                        vbd.bootable = ud == "0" && !alreadyHasBootableDisk;
                        vbd.userdevice = ud;

                        // Now try to plug the VBD.
                        var plugAction = new VbdSaveAndPlugAction(TheVM, vbd, vdi.Name(), session, false);
                        plugAction.ShowUserInstruction += PlugAction_ShowUserInstruction;
                        plugAction.RunAsync();
                    });

                action.VM = TheVM;
                using (var dialog = new ActionProgressDialog(action, ProgressBarStyle.Blocks))
                    dialog.ShowDialog();
                if (!action.Succeeded)
                    return;
            }
            else
            {
                CreateDiskAction action = new CreateDiskAction(vdi);
                using (var dialog = new ActionProgressDialog(action, ProgressBarStyle.Marquee))
                    dialog.ShowDialog();
                if (!action.Succeeded)
                    return;
            }
            DialogResult = DialogResult.OK;
            Close();
        }

        private void PlugAction_ShowUserInstruction(string message)
        {
            Program.Invoke(Program.MainWindow, () =>
            {
                if (!Program.RunInAutomatedTestMode)
                {
                    using (var dlg = new InformationDialog(message))
                        dlg.ShowDialog(Program.MainWindow);
                }
            });
        }

        private static bool HasBootableDisk(VM vm)
        {
            var c = vm.Connection;
            foreach (XenRef<VBD> vbdRef in vm.VBDs)
            {
                var vbd = c.Resolve(vbdRef);

                if (vbd != null && !vbd.IsCDROM() && !vbd.IsFloppyDrive() && vbd.bootable)
                {
                    VDI vdi = c.Resolve(vbd.VDI);

                    if (vdi != null)
                    {
                        SR sr = c.Resolve(vdi.SR);
                        if (sr != null && sr.IsToolsSR())
                        {
                            continue;
                        }
                    }

                    return true;
                }
            }
            return false;
        }

        public VDI NewDisk()
        {
            VDI vdi = new VDI();
            vdi.Connection = connection;
            vdi.read_only = DiskTemplate != null ? DiskTemplate.read_only : false;
            vdi.SR = new XenAPI.XenRef<XenAPI.SR>(SrListBox.SR);

            vdi.virtual_size = diskSpinner1.SelectedSize;
            vdi.name_label = NameTextBox.Text;
            vdi.name_description = DescriptionTextBox.Text;
            vdi.sharable = DiskTemplate != null ? DiskTemplate.sharable : false;
            vdi.type = DiskTemplate != null ? DiskTemplate.type : vdi_type.user;
            vdi.SetVmHint(TheVM != null ? TheVM.uuid : "");
            return vdi;
        }

        public VBD NewDevice()
        {

            VBD vbd = new VBD();
            vbd.Connection = connection;
            vbd.device = "";
            vbd.empty = false;
            vbd.type = XenAPI.vbd_type.Disk;
            vbd.mode = XenAPI.vbd_mode.RW;
            vbd.SetIsOwner(true);
            vbd.unpluggable = true;
            return vbd;

        }

        private void NameTextBox_TextChanged(object sender, EventArgs e)
        {
            UpdateErrorsAndButtons();
        }

        private void diskSpinner1_SelectedSizeChanged()
        {
            UpdateErrorsAndButtons();
        }

        private void UpdateErrorsAndButtons()
        {
            // Ordering is important here, we want to show the most relevant message
            // The error should be shown only for size errors

            SrListBox.UpdateDiskSize(diskSpinner1.SelectedSize);

            if (!diskSpinner1.IsSizeValid)
            {
                OkButton.Enabled = false;
                return;
            }

            if (!SrListBox.ValidSelectionExists)//all SRs disabled
            {
                OkButton.Enabled = false;
                diskSpinner1.SetError(SrListBox.Items.Count > 0 ? Messages.NO_VALID_DISK_LOCATION : null);
                return;
            }

            if (SrListBox.SR == null) //enabled SR exists but the user selects a disabled one
            {
                OkButton.Enabled = false;
                diskSpinner1.SetError(null);
                return;
            }

            if (string.IsNullOrEmpty(NameTextBox.Text.Trim()))
            {
                OkButton.Enabled = false;
                diskSpinner1.SetError(null);
                return;
            }

            OkButton.Enabled = true;
            diskSpinner1.SetError(null);
        }

        private void CloseButton_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.Cancel;
            Close();
        }
    }
}