/* Copyright (c) Citrix Systems, Inc. 
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 * with or without modification, are permitted provided 
 * that the following conditions are met: 
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 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
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 *     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 
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using XenAdmin.Alerts;
using XenAdmin.Commands;
using XenAdmin.XenSearch;
using XenAPI;


namespace XenAdmin.Controls.MainWindowControls
{
    public partial class NavigationPane : UserControl
    {
        public enum NavigationMode
        {
            Infrastructure, Objects, Tags, Folders, CustomFields, vApps,
            SavedSearch, Notifications
        }

        public NavigationMode currentMode
        {
            get;
            private set;
        }

        private NotificationsSubMode lastNotificationsMode = NotificationsSubMode.Alerts;

        #region Events

        [Browsable(true)]
        public event Action<NavigationMode> NavigationModeChanged;

        [Browsable(true)]
        public event Action<NotificationsSubModeItem> NotificationsSubModeChanged;

        [Browsable(true)]
        public event Action TreeViewSelectionChanged;

        [Browsable(true)]
        public event Action TreeNodeBeforeSelected;

        [Browsable(true)]
        public event Action TreeNodeClicked;

        [Browsable(true)]
        public event Action TreeNodeRightClicked;

        [Browsable(true)]
        public event Action TreeViewRefreshed;

        [Browsable(true)]
        public event Action TreeViewRefreshSuspended;

        [Browsable(true)]
        public event Action TreeViewRefreshResumed;

        internal event Action<string> DragDropCommandActivated;

        #endregion

        public NavigationPane()
        {
            InitializeComponent();

            navigationView.DragDropCommandActivated += navigationView_DragDropCommandActivated;

            AddNavigationItemPair(buttonInfraBig, buttonInfraSmall);
            AddNavigationItemPair(buttonObjectsBig, buttonObjectsSmall);
            AddNavigationItemPair(buttonOrganizationBig, buttonOrganizationSmall);
            AddNavigationItemPair(buttonSearchesBig, buttonSearchesSmall);
            AddNavigationItemPair(buttonNotifyBig, buttonNotifySmall);

            buttonInfraBig.SetTag(NavigationMode.Infrastructure);
            buttonObjectsBig.SetTag(NavigationMode.Objects);
            buttonNotifyBig.SetTag(NavigationMode.Notifications);

            PopulateOrganizationDropDown();

            Search.SearchesChanged += PopulateSearchDropDown;
            PopulateSearchDropDown();

            buttonInfraBig.Checked = true;
        }

        protected override void OnResize(EventArgs e)
        {
            int panel2Height = splitContainer1.Panel2.Height;

            base.OnResize(e);
            
            splitContainer1.Panel1MinSize = splitContainer1.ClientSize.Height - toolStripBig.MaximumSize.Height - splitContainer1.SplitterWidth;

            // Recalculate splitter distance so that Panel2.Height is preserved
            splitContainer1.SplitterDistance = splitContainer1.ClientSize.Height - panel2Height - splitContainer1.SplitterWidth; 
        }

        #region Accessors

        private Search m_search;
        public Search Search
        {
            get
            {
                switch (currentMode)
                {
                    case NavigationMode.Notifications:
                    case NavigationMode.Infrastructure:
                        return TreeSearch.DefaultTreeSearch ?? TreeSearch.SearchFor(null);
                    case NavigationMode.Objects:
                        return Search.SearchForAllTypes();
                    case NavigationMode.Tags:
                        return Search.SearchForTags();
                    case NavigationMode.Folders:
                        return Search.SearchForFolders();
                    case NavigationMode.CustomFields:
                        return Search.SearchForCustomFields();
                    case NavigationMode.vApps:
                        return Search.SearchForVapps();
                    default:
                        return m_search;
                }
            }
        }

        public bool InSearchMode
        {
            set { navigationView.InSearchMode = value; }
        }

        internal SelectionBroadcaster SelectionManager
        {
            get { return navigationView.SelectionManager; }
        }

        #endregion

        public void UpdateNotificationsButton(NotificationsSubMode mode, int entries)
        {
            notificationsView.UpdateEntries(mode, entries);
            buttonNotifyBig.UnreadEntries = buttonNotifySmall.UnreadEntries = notificationsView.GetTotalEntries();
        }

        public void XenConnectionCollectionChanged(CollectionChangeEventArgs e)
        {
            navigationView.XenConnectionCollectionChanged(e);
        }

        public bool SelectObject(IXenObject o)
        {
            return navigationView.SelectObject(o, false);
        }

        public void EditSelectedNode()
        {
           navigationView.EditSelectedNode();
        }

        public bool TryToSelectNewNode(Predicate<object> tagMatch, bool selectNode, bool expandNode, bool ensureNodeVisible)
        {
            return navigationView.TryToSelectNewNode(tagMatch, selectNode, expandNode, ensureNodeVisible);
        }

        public void UpdateSearch()
        {
            navigationView.CurrentSearch = Search;
        }
        
        public void RequestRefreshTreeView()
        {
            navigationView.RequestRefreshTreeView();
        }

        public void FocusTreeView()
        {
            navigationView.FocusTreeView();
        }

        public void SaveAndRestoreTreeViewFocus(MethodInvoker f)
        {
            navigationView.MajorChange(() => navigationView.SaveAndRestoreTreeViewFocus(f));
        }

        public void SwitchToInfrastructureMode()
        {
            if (!buttonInfraBig.Checked)
                buttonInfraBig.Checked = true;
        }

        private void SwitchToNotificationsView(NotificationsSubMode subMode)
        {
            //check the button if switching has been requested programmatically
            if (!buttonNotifyBig.Checked)
                buttonNotifyBig.Checked = true;

            //show the notificationsView first and then hide the navigationView
            //to avoid instantaneous appearance of empty panels
            notificationsView.Visible = true;
            notificationsView.SelectNotificationsSubMode(subMode);
            navigationView.Visible = false;
        }

        #region Private Methods

        private void AddNavigationItemPair(INavigationItem bigButton, INavigationItem smallButton)
        {
            bigButton.PairedItem = smallButton;
            smallButton.PairedItem = bigButton;
            bigButton.NavigationViewChanged += NavigationViewChanged;
            smallButton.NavigationViewChanged += NavigationViewChanged;
        }

        private void PopulateOrganizationDropDown()
        {
            toolStripMenuItemFields.Tag = NavigationMode.CustomFields;
            toolStripMenuItemFolders.Tag = NavigationMode.Folders;
            toolStripMenuItemTags.Tag = NavigationMode.Tags;
            toolStripMenuItemVapps.Tag = NavigationMode.vApps;

            var items = from ToolStripItem item in buttonOrganizationBig.DropDownItems select item;
            buttonOrganizationBig.SetItemList(items.ToArray());
        }

        private void PopulateSearchDropDown()
        {
            Search[] searches = Search.Searches;
            Array.Sort(searches);

            var itemList = new List<ToolStripMenuItem>();

            foreach (Search search in searches)
            {
                var item = new ToolStripMenuItem
                               {
                                   Text = search.Name.EscapeAmpersands(),
                                   Tag = search,
                                   Image = search.DefaultSearch
                                               ? Properties.Resources._000_defaultSpyglass_h32bit_16
                                               : Properties.Resources._000_Search_h32bit_16,

                               };
                itemList.Add(item);
            }

            buttonSearchesBig.SetItemList(itemList.ToArray());
        }

        private void OnNavigationModeChanged()
        {
            if (currentMode == NavigationMode.Notifications)
            {
                SelectionManager.SaveAndClearSelection();

                //restore the last selected view
                SwitchToNotificationsView(lastNotificationsMode);
            }
            else
            {
                SelectionManager.RestoreSavedSelection();

                //show the navigationView first and then hide the notificationsView
                //to avoid instantaneous appearance of empty panels
                navigationView.Visible = true;
                notificationsView.Visible = false;

                navigationView.CurrentSearch = Search;
                navigationView.NavigationMode = currentMode;
                navigationView.ResetSeachBox();
                navigationView.RefreshTreeView();
                navigationView.FocusTreeView();

                if (navigationView.SelectionManager.Selection.Count < 1)
                    navigationView.SelectObject(null, false);
                navigationView.ForceTreeViewSelectionsChanged();
            }

            if (NavigationModeChanged != null)
                NavigationModeChanged(currentMode);
        }

        #endregion

        #region Control Event Handlers

        private void navigationView_DragDropCommandActivated(string cmdText)
        {
            if (DragDropCommandActivated != null)
                DragDropCommandActivated(cmdText);
        }


        private void navigationView_TreeViewSelectionChanged()
        {
            if (TreeViewSelectionChanged != null)
                TreeViewSelectionChanged();
        }

        private void navigationView_TreeNodeBeforeSelected()
        {
            if (TreeNodeBeforeSelected != null)
                TreeNodeBeforeSelected();
        }

        private void navigationView_TreeNodeClicked()
        {
            if (TreeNodeClicked != null)
                TreeNodeClicked();
        }

        private void navigationView_TreeNodeRightClicked()
        {
            if (TreeNodeRightClicked != null)
                TreeNodeRightClicked();
        }

        private void navigationView_TreeViewRefreshed()
        {
            if (TreeViewRefreshed != null)
                TreeViewRefreshed();
        }

        private void navigationView_TreeViewRefreshResumed()
        {
            if (TreeViewRefreshResumed != null)
                TreeViewRefreshResumed();
        }

        private void navigationView_TreeViewRefreshSuspended()
        {
            if (TreeViewRefreshSuspended != null)
                TreeViewRefreshSuspended();
        }


        private void NavigationViewChanged(object obj)
        {
            var search = obj as Search;

            if (search == null)
            {
                currentMode = (NavigationMode)obj;
            }
            else
            {
                m_search = search;
                currentMode = NavigationMode.SavedSearch;
            }

            OnNavigationModeChanged();
        }

        private void toolStripBig_LayoutCompleted(object sender, EventArgs e)
        {
            foreach (ToolStripItem item in toolStripBig.Items)
            {
                var navItem = item as INavigationItem;
                if (navItem == null)
                    continue;

                var pairedItem = navItem.PairedItem as ToolStripItem;
                if (pairedItem == null)
                    return;

                pairedItem.Visible = (item.Placement == ToolStripItemPlacement.None);
            }
        }

        private void notificationsView_NotificationsSubModeChanged(NotificationsSubModeItem subModeItem)
        {
            lastNotificationsMode = subModeItem.SubMode;

            if (NotificationsSubModeChanged != null)
                NotificationsSubModeChanged(subModeItem);
        }

        #endregion
    }
}