/* Copyright (c) Citrix Systems Inc. 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;

using XenAdmin.Core;
using XenAdmin.Dialogs;
using XenAPI;
using XenAdmin.Commands;


namespace XenAdmin.TabPages
{
    internal partial class VMStoragePage : UserControl
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private readonly ContextMenu _TheContextMenu = new ContextMenu();
        private readonly DataGridViewColumn storageLinkColumn;

        private VM vm;

        public VMStoragePage()
        {
            InitializeComponent();

            _TheContextMenu.MenuItems.Add(AddButton.Text, AddButton_Click);

            storageLinkColumn = ColumnSRVolume;

            TitleLabel.ForeColor = Program.HeaderGradientForeColor;
            TitleLabel.Font = Program.HeaderGradientFont;
            dataGridViewStorage.SortCompare += new DataGridViewSortCompareEventHandler(dataGridViewStorage_SortCompare);
            dataGridViewStorage.Sort(ColumnDevicePosition, ListSortDirection.Ascending);
        }

        void dataGridViewStorage_SortCompare(object sender, DataGridViewSortCompareEventArgs e)
        {
            if (e.Column == ColumnDevicePosition)
            {
                e.SortResult = StringUtility.NaturalCompare(e.CellValue1.ToString(), e.CellValue2.ToString());

                e.Handled = true;
            }
            else
            {
                e.Handled = false;
            }
        }

        public VM VM
        {
            set
            {
                Program.AssertOnEventThread();

                // de-register old listener...
                if (vm != null)
                {
                    foreach (VBD vbd in vm.Connection.ResolveAll(vm.VBDs))
                    {
                        vbd.PropertyChanged -= vbd_PropertyChanged;

                        VDI vdi = vm.Connection.Resolve(vbd.VDI);
                        if (vdi == null)
                            continue;

                        vdi.PropertyChanged -= vdi_PropertyChanged;
                    }

                    vm.PropertyChanged -= vm_PropertyChanged;
                }

                vm = value;
                multipleDvdIsoList1.VM = vm;

                if (vm != null)
                    vm.PropertyChanged += vm_PropertyChanged;

                BuildList();

                // set all columns to be preferred width but allow user to resize.
                foreach (DataGridViewTextBoxColumn col in dataGridViewStorage.Columns)
                {
                    if (col != storageLinkColumn)
                    {
                        col.Width = col.GetPreferredWidth(DataGridViewAutoSizeColumnMode.AllCells, false);
                    }
                }
            }
        }

        private void vdi_PropertyChanged(object sender1, PropertyChangedEventArgs e)
        {
            // Nothing changing on any of the vdi's will require a rebuild of the list...

            if (e.PropertyName == "allowed_operations")
                UpdateButtons();
            else
                UpdateData();
        }

        private void vbd_PropertyChanged(object sender1, PropertyChangedEventArgs e)
        {
            // Only rebuild list if VDIs changed - otherwise just refresh

            if (e.PropertyName == "VDI" || e.PropertyName == "empty" || e.PropertyName == "device")
            {
                BuildList();
            }
            else if (e.PropertyName == "allowed_operations")
            {
                UpdateButtons();
            }
            else if (e.PropertyName == "currently_attached")
            {
                UpdateButtons();
                UpdateData();
            }
            else
            {
                UpdateData();
            }
        }

        private void UpdateData()
        {
            try
            {
                dataGridViewStorage.SuspendLayout();
                foreach (DataGridViewRow r in dataGridViewStorage.Rows)
                {
                    VBDRow row = r as VBDRow;
                    row.UpdateCells();
                }
                dataGridViewStorage.Sort(dataGridViewStorage.SortedColumn,
                                         dataGridViewStorage.SortOrder == SortOrder.Ascending
                                             ? ListSortDirection.Ascending
                                             : ListSortDirection.Descending);

            }
            catch (Exception e)
            {
                log.Error("Error updating vm storage list.", e);
            }
            finally
            {
                dataGridViewStorage.ResumeLayout();
            }
        }

        private void vm_PropertyChanged(object sender1, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "VBDs")
                BuildList();
            else if (e.PropertyName == "power_state" || e.PropertyName == "Locked")
                Program.Invoke(this, UpdateButtons);
        }

        private void BuildList()
        {
            Program.AssertOnEventThread();
            if (!this.Visible)
                return;
            try
            {
                dataGridViewStorage.SuspendLayout();
                DataGridViewSelectedRowCollection vbdSavedItems = dataGridViewStorage.SelectedRows;

                dataGridViewStorage.Rows.Clear();

                if (vm == null)
                    return;

                bool storageLinkColumnVisible = false;

                List<bool> devices_in_use = new List<bool>();
                foreach (VBD vbd in vm.Connection.ResolveAll(vm.VBDs))
                {
                    vbd.PropertyChanged -= new PropertyChangedEventHandler(vbd_PropertyChanged);
                    vbd.PropertyChanged += new PropertyChangedEventHandler(vbd_PropertyChanged);

                    if (!vbd.IsCDROM && !vbd.IsFloppyDrive)
                    {
                        VDI vdi = vm.Connection.Resolve(vbd.VDI);
                        if (vdi == null || !vdi.Show(Properties.Settings.Default.ShowHiddenVMs))
                            continue;

                        SR sr = vm.Connection.Resolve(vdi.SR);
                        if (sr == null || sr.IsToolsSR)
                            continue;

                        storageLinkColumnVisible = vdi.sm_config.ContainsKey("SVID");

                        vdi.PropertyChanged -= new PropertyChangedEventHandler(vdi_PropertyChanged);
                        vdi.PropertyChanged += new PropertyChangedEventHandler(vdi_PropertyChanged);

                        dataGridViewStorage.Rows.Add(new VBDRow(vbd, vdi, sr));

                        int i;
                        if (int.TryParse(vbd.userdevice, out i))
                        {
                            while (devices_in_use.Count <= i)
                            {
                                devices_in_use.Add(false);
                            }
                            devices_in_use[i] = true;
                        }
                    }

					//CA-47050: the dnsColumn should be autosized to Fill, but should not become smaller than a minimum
					//width, which is chosen to be the column's contents (including header) width. To find what this is
					//set temporarily the column's autosize mode to AllCells.
					HelpersGUI.ResizeLastGridViewColumn(ColumnDevicePath);
                }


                storageLinkColumn.Visible = storageLinkColumnVisible;
                dataGridViewStorage.Sort(dataGridViewStorage.SortedColumn, dataGridViewStorage.SortOrder == SortOrder.Ascending ? ListSortDirection.Ascending : ListSortDirection.Descending);

                IEnumerable<VBD> vbdsSelected = from VBDRow row in vbdSavedItems select row.VBD;
                foreach (VBDRow row in dataGridViewStorage.Rows)
                {
                    row.Selected = vbdsSelected.Contains(row.VBD);
                }
            }
            catch (Exception e)
            {
                log.ErrorFormat("Exception building VM storage list: {0}", e.Message);
            }
            finally
            {
                dataGridViewStorage.ResumeLayout();
            }
            UpdateButtons();
        }

        private List<VBDRow> SelectedVBDRows
        {
            get
            {
                if (dataGridViewStorage.SelectedRows.Count == 0)
                    return null;

                List<VBDRow> rows = new List<VBDRow>();
                foreach (DataGridViewRow r in dataGridViewStorage.SelectedRows)
                    rows.Add(r as VBDRow);

                return rows;
            }
        }

        private void TheHeaderListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateButtons();
        }

        private void UpdateButtons()
        {
            AttachVirtualDiskCommand attachCmd = new AttachVirtualDiskCommand(Program.MainWindow, vm);
            AttachButton.Enabled = attachCmd.CanExecute();
            AddButton.Enabled = attachCmd.CanExecute();

            List<VBDRow> vbdRows = SelectedVBDRows;

            if (dataGridViewStorage.Rows.Count == 0 || vbdRows == null || vm == null)
            {
                DeactivateButton.Enabled = false;
                DetachDriveButton.Enabled = false;
                DeleteDriveButton.Enabled = false;
                EditButton.Enabled = false;
                MoveButton.Enabled = false;
                return;
            }
            EditButton.Enabled = vbdRows.Count == 1 && !vbdRows[0].VBD.Locked && !vbdRows[0].VDI.Locked;

            List<SelectedItem> selectedVDIs = new List<SelectedItem>();
            List<SelectedItem> selectedVBDs = new List<SelectedItem>();

            foreach (VBDRow r in vbdRows)
            {
                selectedVDIs.Add(new SelectedItem(r.VDI));
                selectedVBDs.Add(new SelectedItem(r.VBD));
            }
            DeleteVirtualDiskCommand deleteCmd = new DeleteVirtualDiskCommand(Program.MainWindow, selectedVDIs);
            // User has visibility that this disk in use by this VM. Allow unplug + delete in single step (non default behaviour),
            // but only if we are the only VBD (default behaviour)
            deleteCmd.AllowRunningVMDelete = true;
            if (deleteCmd.CanExecute())
            {
                DeleteButtonContainer.RemoveAll();
                DeleteDriveButton.Enabled = true;
            }
            else
            {
                DeleteButtonContainer.SetToolTip(deleteCmd.ToolTipText);
                DeleteDriveButton.Enabled = false;
            }

            Command activationCmd = null;

            SelectedItemCollection vbdCol = new SelectedItemCollection(selectedVBDs);
            if (vbdCol.AsXenObjects<VBD>().Find(delegate(VBD vbd) { return !vbd.currently_attached; }) == null)
            {
                // no VBDs are attached so we are deactivating
                DeactivateButton.Text = Messages.DEACTIVATE;
                activationCmd = new DeactivateVBDCommand(Program.MainWindow, selectedVBDs);
            }
            else
            {
                // this is the default cause in the mixed attached/detatched scenario. We try to activate all the selection
                // The command error reports afterwards about the ones which are already attached
                DeactivateButton.Text = Messages.ACTIVATE;
                activationCmd = new ActivateVBDCommand(Program.MainWindow, selectedVBDs);
            }

            if (activationCmd.CanExecute())
            {
                DeactivateButtonContainer.RemoveAll();
                DeactivateButton.Enabled = true;
            }
            else
            {
                DeactivateButtonContainer.SetToolTip(activationCmd.ToolTipText);
                DeactivateButton.Enabled = false;
            }

            DetachVirtualDiskCommand detachCmd = new DetachVirtualDiskCommand(Program.MainWindow, selectedVDIs, vm);
            if (detachCmd.CanExecute())
            {
                DetachButtonContainer.RemoveAll();
                DetachDriveButton.Enabled = true;
            }
            else
            {
                DetachButtonContainer.SetToolTip(detachCmd.ToolTipText);
                DetachDriveButton.Enabled = false;
            }

            // Move button
            Command moveCmd = MoveMigrateCommand(selectedVDIs);
            if (moveCmd.CanExecute())
            {
                MoveButton.Enabled = true;
                MoveButtonContainer.RemoveAll();
            }
            else
            {
                MoveButton.Enabled = false;
                MoveButtonContainer.SetToolTip(moveCmd.ToolTipText);
            }
        }

        private Command MoveMigrateCommand(IEnumerable<SelectedItem> selection)
        {
            MoveVirtualDiskCommand moveCmd = new MoveVirtualDiskCommand(Program.MainWindow, selection);

            if (moveCmd.CanExecute())
                return moveCmd;

            return new MigrateVirtualDiskCommand(Program.MainWindow, selection);
        }

        private void AddButton_Click(object sender, EventArgs e)
        {
            var cmd = new AddVirtualDiskCommand(Program.MainWindow, vm);
            if (cmd.CanExecute())
                cmd.Execute();

            // don't wait for the property change to trigger it, as this can take a while
            UpdateButtons();
        }

        private void AttachButton_Click(object sender, EventArgs e)
        {
            AttachVirtualDiskCommand cmd = new AttachVirtualDiskCommand(Program.MainWindow, vm);
            if (cmd.CanExecute())
                cmd.Execute();

            UpdateButtons();
        }

        private void MoveButton_Click(object sender, EventArgs e)
        {
            List<VBDRow> rows = SelectedVBDRows;
            if (rows == null)
                return;
            List<SelectedItem> l = new List<SelectedItem>();
            foreach (VBDRow r in rows)
                l.Add(new SelectedItem(r.VDI));

            Command cmd = MoveMigrateCommand(l);
            if (cmd.CanExecute())
                cmd.Execute();
        }

        /// <summary>
        /// User has clicked the detach button. Unplug the VBD, then destroy it.
        /// </summary>
        private void DetachButton_Click(object sender, EventArgs e)
        {
            List<VBDRow> rows = SelectedVBDRows;
            if (rows == null)
                return;
            List<SelectedItem> l = new List<SelectedItem>();
            foreach (VBDRow r in rows)
                l.Add(new SelectedItem(r.VDI));

            DetachVirtualDiskCommand cmd = new DetachVirtualDiskCommand(Program.MainWindow, l, vm);
            if (cmd.CanExecute())
                cmd.Execute();
        }

        private void DeleteDriveButton_Click(object sender, EventArgs e)
        {
            List<VBDRow> rows = SelectedVBDRows;
            if (rows == null)
                return;
            List<SelectedItem> l = new List<SelectedItem>();
            foreach (VBDRow r in rows)
                l.Add(new SelectedItem(r.VDI));

            DeleteVirtualDiskCommand cmd = new DeleteVirtualDiskCommand(Program.MainWindow, l);
            // User has visibility that this disk in use by this VM. Allow unplug + delete in single step (non default behaviour),
            // but only if we are the only VBD (default behaviour)
            cmd.AllowRunningVMDelete = true;
            if (cmd.CanExecute())
                cmd.Execute();
        }

        private void EditButton_Click(object sender, EventArgs e)
        {
            if (vm == null)
                return;

            List<VBDRow> rows = SelectedVBDRows;

            if (rows == null)
                return;

            new PropertiesDialog(rows[0].VDI).ShowDialog(this);
        }

        private void TheHeaderListBox_CellMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.RowIndex >= 0 && EditButton.Enabled == true)
            {
                // If double-click was on data row (not including header), launch the storage edit box
                EditButton_Click(null, null);
            }
        }

        private void TheHeaderListBox_DataGridView_MouseUp(object sender, MouseEventArgs e)
        {
            // Load context menus on right mouse click
            DataGridView.HitTestInfo hitTestInfo;
            if (e.Button == MouseButtons.Right)
            {
                hitTestInfo = dataGridViewStorage.HitTest(e.X, e.Y);
                if (hitTestInfo.Type == DataGridViewHitTestType.Cell)
                {
                    if (dataGridViewStorage.Rows.Count >= 0)
                    {
                        if (!dataGridViewStorage.Rows[hitTestInfo.RowIndex].Selected)
                        {
                            // Select the row that the user right clicked on (similiar to outlook) if it's not already in the selection
                            // (avoids clearing a multiselect if you right click inside it)
                            // Check if the CurrentCell is the cell the user right clicked on (but the row is not Selected) [CA-64954]
                            // This happens when the grid is initially shown: the current cell is the first cell in the first column, but the row is not selected
                            if (dataGridViewStorage.CurrentCell == dataGridViewStorage[hitTestInfo.ColumnIndex, hitTestInfo.RowIndex])
                                dataGridViewStorage.Rows[hitTestInfo.RowIndex].Selected = true;
                            else
                                dataGridViewStorage.CurrentCell = dataGridViewStorage[hitTestInfo.ColumnIndex, hitTestInfo.RowIndex];
                        }
                        // Update the menus as they are contextual
                        PopulateContextMenu();
                        // Show the menus.  We will always have at least one (Add).
                        _TheContextMenu.Show(dataGridViewStorage, new Point(e.X, e.Y));
                    }
                }
            }
        } // TheHeaderListBox_DataGridView_MouseUp

        private void PopulateContextMenu()
        {
            _TheContextMenu.MenuItems.Clear();
            if (AddButton.Visible && AddButton.Enabled)
                _TheContextMenu.MenuItems.Add(AddButton.Text, AddButton_Click);
            if (AttachButton.Visible && AttachButton.Enabled)
                _TheContextMenu.MenuItems.Add(AttachButton.Text, AttachButton_Click);
            if (DeactivateButton.Enabled)
                _TheContextMenu.MenuItems.Add(DeactivateButton.Text, DeactivateButton_Click);
            if (MoveButton.Enabled)
                _TheContextMenu.MenuItems.Add(MoveButton.Text, MoveButton_Click);
            if (DeleteDriveButton.Visible && DeleteDriveButton.Enabled)
                _TheContextMenu.MenuItems.Add(DeleteDriveButton.Text, DeleteDriveButton_Click);
            if (DetachDriveButton.Visible && DetachDriveButton.Enabled)
                _TheContextMenu.MenuItems.Add(DetachDriveButton.Text, DetachButton_Click);
            if (EditButton.Visible && EditButton.Enabled)
                _TheContextMenu.MenuItems.Add(EditButton.Text, EditButton_Click);
        }

        private void DeactivateButton_Click(object sender, EventArgs e)
        {
            List<VBDRow> rows = SelectedVBDRows;
            if (rows == null)
                return;
            List<SelectedItem> l = new List<SelectedItem>();
            foreach (VBDRow r in rows)
                l.Add(new SelectedItem(r.VBD));

            SelectedItemCollection col = new SelectedItemCollection(l);
            Command cmd = null;
            if (col.AsXenObjects<VBD>().Find(vbd => !vbd.currently_attached) == null)
                cmd = new DeactivateVBDCommand(Program.MainWindow, l);
            else
                cmd = new ActivateVBDCommand(Program.MainWindow, l);

            if (cmd.CanExecute())
                cmd.Execute();
        }       
    }

    public class VBDRow : DataGridViewRow
    {
        public readonly VBD VBD;

        public readonly VDI VDI;

        public readonly SR SR;

        /// <summary>
        /// Arguments should never be null
        /// </summary>
        public VBDRow(VBD vbd, VDI vdi, SR sr)
        {
            Debug.Assert(vbd != null && vdi != null && sr != null, "vbd, vdi and sr must be set to a non-null value");

            VBD = vbd;
            VDI = vdi;
            SR = sr;

            for (int i = 0; i < 10; i++)
            {
                DataGridViewTextBoxCell c = new DataGridViewTextBoxCell();
                c.Value = CellValue(i);
                Cells.Add(c);
            }
        }

        public int CompareTo(object o)
        {
            VBDRow r = (VBDRow)o;
            string c1 = this.VBD.userdevice;
            string c2 = r.VBD.userdevice;
            int i1;
            int i2;
            if (int.TryParse(c1, out i1) && int.TryParse(c2, out i2))
            {
                return i1 - i2;
            }
            else
            {
                return c1.CompareTo(c2);
            }
        }

        private object CellValue(int col)
        {
            switch (col)
            {
                case 0:
                    return VBD.userdevice;
                case 1:
                    return VDI.Name;
                case 2:
                    return VDI.Description;
                case 3:
                    return SR.Name;
                case 4:
                    string name;
                    return VDI.sm_config.TryGetValue("displayname", out name) ? name : "";
                case 5:
                    return VDI.SizeText;
                case 6:
                    return VBD.read_only ? Messages.YES : Messages.NO;
                case 7:
                    return GetPriorityString(VBD.IONice);
                case 8:
                    return VBD.currently_attached ? Messages.YES : Messages.NO;
                case 9:
                    return VBD.device == "" ? Messages.STORAGE_PANEL_UNKNOWN : string.Format("/dev/{0}", VBD.device);
                default:
                    throw new ArgumentException(String.Format("Invalid column number {0} in VBDRenderer.CellValue()", col));
            }
        }

        public void UpdateCells()
        {
            for (int i = 0; i < 10; i++)
            {
                Cells[i].Value = CellValue(i);
            }
        }

        private static string GetPriorityString(int p)
        {
            switch (p)
            {
                case 0:
                    return Messages.STORAGE_WORST;
                case 7:
                    return Messages.STORAGE_BEST;
                default:
                    return p.ToString();
            }
        }
    }
}