using Common;
///
/// Copyright (c) 2013-2015 Senus Slovensko a.s.
///
using System;
using System.Windows.Forms;
using TBF.Resources;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace TBF.UI.Shared
{
    public partial class SharedSearchForListView : UserControl
    {

        private Common.Forms.ListViewEx listViewEx;

        public Common.Forms.ListViewEx ListViewEx
        {
            get { return listViewEx; }
            set { listViewEx = value; }
        }

        /// <summary>
        /// Masks to specify the enabled state and the visibility of buttons.
		/// Unlock button is hard coded in this control, cannot be set from the parent.
        /// </summary>
        public enum Buttons
        {
            None	        = 0,
			Go		        = (1 << 0),	/// optional
            Find            = (1 << 1),	/// optional
            FindNext        = (1 << 2),	/// optional
            FindBack        = (1 << 3),	/// optional
            JumpToTop       = (1 << 4),	/// optional
            JumpToBottom    = (1 << 5),	/// optional
        }

        readonly System.Windows.Forms.Button[] buttonCtrls;

        /// <summary>
        /// Optional buttons are Add, Remove, Up, Down, Edit and Copy.
		/// OK and Cancel buttons are always visible (after unlock), but not always enabled.
        /// </summary>
        public Buttons OptionalButtons;

        public enum LState
        {
            Locked,		/// 'Unlock', 'Close' (=OK) are shown, all the othere are hidden
            Unlocked,	/// Unlock, Ok, Cancel, Add,Remove and all optional buttons are shown
        }
        LState lockState;
        public LState LockState { get { return lockState; } }

        bool buttonsRepositionsed;

		public bool MoreActive;
        public int MoreButtonTop;

		/// <summary>
		/// Used by controls to indicate which item is selected
		/// and to appropriately update Remove, Up and Down Buttons.
		/// </summary>
		public enum SelectedItemPos
		{
			None,
			First,
			Last,
			FirstAndLast,
			Middle,
		}

        public Form OwnerForm;     /// Used as a current form reference when changing and restoring a user

		public GID[] RequiredGroupMembership;

        /// <summary>
        /// Default constructor
        /// </summary>
        public SharedSearchForListView()
        {
            InitializeComponent();
            lockState = LState.Locked;
            MoreActive = false;
            RequiredGroupMembership = null;
            buttonCtrls = new System.Windows.Forms.Button[]
            {
                findButton, findNextButton, findBackButton,
                goButton,
                jumpToTopButton, jumpToBottomButton,
            };
            OptionalButtons = Buttons.None;
            buttonsRepositionsed = false;
        }

        void ShowOrHideButtons(Buttons selectedButtons, bool value)
        {
            for (int i = 0; i < buttonCtrls.Length; i++)
            {
                if ((selectedButtons & (Buttons)(1 << i)) != 0) buttonCtrls[i].Visible = value;
            }
        }

        public void EnableOrDisableButtons(Buttons selectedButtons, bool value)
        {
            for (int i = 0; i < buttonCtrls.Length; i++)
            {
                if ((selectedButtons & (Buttons)(1 << i)) != 0) buttonCtrls[i].Enabled = value;
            }
        }

        /// <summary>
        /// Initialize the buttons when the dialog is loaded
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SharedDlgSearchForListView_Load(object sender, EventArgs e)
        {
            //Label.Text = "nr.";//Strings.UnlockBtnText;
            searchLabel.Text = "Search";
            findButton.Text = "Find";
            goButton.Text = "Go";
            jumpToBottomButton.Text = "Jump to bottom";
            jumpToTopButton.Text = "Jump to top";

            ShowOrHideButtons((Buttons)0x1F, true);
        }

        private void goButton_Click(object sender, EventArgs e)
        {
            if (int.TryParse(nrTextBox.Text, out int index))
            {
                // ListView indexing: first = 0
                index--;

                if (index >= 0 && index < listViewEx.Items.Count)
                {
                    //listViewEx.SelectedItems.Clear();

                    /*listViewEx.FullRowSelect = true;
                    listViewEx.HideSelection = false;
                    listViewEx.OwnerDraw = false;*/

                    var item = listViewEx.Items[index];
                    listViewEx.HideSelection = false;
                    item.Selected = true;
                    listViewEx.Select();
                    item.Focused = true;
                    item.EnsureVisible(); // automatic scroll
                }
            }
            else
            {
                MessageBox.Show("Invalid character.");
            }
        }

        // Stores the last search text
        private string _lastSearchText = string.Empty;

        // Stores the index of the last found item in the ListView
        private int _lastFoundIndex = -1;

        private void findButton_Click(object sender, EventArgs e)
        {
            // Get search text
            string search = searchTextBox.Text.Trim();
            if (string.IsNullOrEmpty(search))
                return;

            string searchLower = search.ToLower();

            // Store search state
            _lastSearchText = search;
            _lastFoundIndex = -1;

            // Find first occurrence from the top
            int index = FindItemIndex(searchLower, 0, +1);
            if (index == -1)
            {
                MessageBox.Show("No results found.");
                return;
            }

            // Remember last found index
            _lastFoundIndex = index;

            // Select item
            SelectItemAtIndex(index);
        }

        /// <summary>
        /// Finds an item in the ListView starting from given index and direction.
        /// </summary>
        /// <param name="search">Search text (lowercase).</param>
        /// <param name="startIndex">Index to start from.</param>
        /// <param name="direction">+1 = forward, -1 = backward.</param>
        /// <returns>Index of found item or -1 if not found.</returns>
        private int FindItemIndex(string search, int startIndex, int direction)
        {
            // No items -> nothing to search
            if (listViewEx.Items.Count == 0)
                return -1;

            // Clamp start index to valid range
            if (startIndex < 0)
                startIndex = 0;
            if (startIndex >= listViewEx.Items.Count)
                startIndex = listViewEx.Items.Count - 1;

            // Forward search
            if (direction > 0)
            {
                for (int i = startIndex; i < listViewEx.Items.Count; i++)
                {
                    var item = listViewEx.Items[i];

                    // Check all subitems (columns)
                    foreach (ListViewItem.ListViewSubItem sub in item.SubItems)
                    {
                        if (sub.Text.ToLower().Contains(search))
                            return i;
                    }
                }
            }
            // Backward search
            else if (direction < 0)
            {
                for (int i = startIndex; i >= 0; i--)
                {
                    var item = listViewEx.Items[i];

                    // Check all subitems (columns)
                    foreach (ListViewItem.ListViewSubItem sub in item.SubItems)
                    {
                        if (sub.Text.ToLower().Contains(search))
                            return i;
                    }
                }
            }

            // Nothing found
            return -1;
        }

        /// <summary>
        /// Selects and scrolls to the item at given index.
        /// </summary>
        private void SelectItemAtIndex(int index)
        {
            if (index < 0 || index >= listViewEx.Items.Count)
                return;

            // Clear previous selection
            listViewEx.SelectedItems.Clear();

            // Select and focus item
            var item = listViewEx.Items[index];
            listViewEx.HideSelection = false;
            item.Selected = true;
            listViewEx.Select();
            item.Focused = true;
            item.EnsureVisible();
        }

        private void findNextButton_Click(object sender, EventArgs e)
        {
            // Get current search text
            string search = searchTextBox.Text.Trim();
            if (string.IsNullOrEmpty(search))
                return;

            string searchLower = search.ToLower();

            // If search text changed, start from scratch
            if (search != _lastSearchText)
            {
                _lastSearchText = search;
                _lastFoundIndex = -1;
            }

            // Start searching from the next item after the last found one
            int startIndex = _lastFoundIndex + 1;
            int index = FindItemIndex(searchLower, startIndex, +1);
            if (index == -1)
            {
                MessageBox.Show("No more results.");
                return;
            }

            _lastFoundIndex = index;
            SelectItemAtIndex(index);
        }

        private void findBackButton_Click(object sender, EventArgs e)
        {
            // Get current search text
            string search = searchTextBox.Text.Trim();
            if (string.IsNullOrEmpty(search))
                return;

            string searchLower = search.ToLower();

            // If search text changed, start from scratch
            if (search != _lastSearchText)
            {
                _lastSearchText = search;
                _lastFoundIndex = listViewEx.Items.Count; // start from bottom
            }

            // Start searching from the previous item before the last found one
            int startIndex = _lastFoundIndex - 1;
            int index = FindItemIndex(searchLower, startIndex, -1);
            if (index == -1)
            {
                MessageBox.Show("No more results.");
                return;
            }

            _lastFoundIndex = index;
            SelectItemAtIndex(index);
        }

        private void jumpToTopButton_Click(object sender, EventArgs e)
        {
            // Check if there are any items in the ListView
            if (listViewEx.Items.Count == 0)
                return;

            // Get the first item (index 0)
            ListViewItem firstItem = listViewEx.Items[0];

            // Clear previous selection
            //listViewEx.SelectedItems.Clear();

            // Select the first item
            firstItem.Selected = true;
            firstItem.Focused = true;    // give keyboard focus to the item
            firstItem.EnsureVisible();   // scroll so the item is visible (top)
        }

        private void jumpToBottomButton_Click(object sender, EventArgs e)
        {
            if (listViewEx.Items.Count == 0) return;

            var last = listViewEx.Items[listViewEx.Items.Count - 1];
            //listViewEx.SelectedItems.Clear();
            last.Selected = true;
            last.Focused = true;
            last.EnsureVisible();
        }

        private void procedureNrTextBox_Enter(object sender, EventArgs e)
        {
            // When ProcedureNr textbox has focus, Enter will trigger Go button
            var form = this.FindForm();
            if (form != null)
                form.AcceptButton = goButton;
        }

        private void searchTextBox_Enter(object sender, EventArgs e)
        {
            // When Search textbox has focus, Enter will trigger Find button
            var form = this.FindForm();
            if (form != null)
                form.AcceptButton = findButton;
        }
    }

        /*/// <summary>
        /// Events invoked when buttons are clicked (and in case of Unlock kbutton also accepted)
        /// </summary>
        public event EventHandler Unlocked;
        public event EventHandler GoClicked;
        public event EventHandler FindClicked;
        public event EventHandler FindNextClicked;
        public event EventHandler FindBackClicked;
        public event EventHandler JumpToTopClicked;
        public event EventHandler JumpToBottomClicked;

        ///
        /// All remaining handlers:
        ///
        private void cancelBtn_Click(object s, EventArgs e)         { if (CancelClicked != null)    CancelClicked(s, e);    }
        private void addBtn_Click(object s, EventArgs e)            { if (AddClicked != null)       AddClicked(s, e);       }
        private void removeBtn_Click(object s, EventArgs e)         { if (RemoveClicked != null)    RemoveClicked(s, e);    }
        private void upBtn_Click(object s, EventArgs e)             { if (UpClicked != null)        UpClicked(s, e);        }
        private void downBtn_Click(object s, EventArgs e)           { if (DownClicked != null)      DownClicked(s, e);      }
        private void editBtn_Click(object s, EventArgs e)           { if (EditClicked != null)      EditClicked(s, e);      }
        private void copyBtn_Click(object s, EventArgs e)           { if (CopyClicked != null)      CopyClicked(s, e);      }
        private void exportButton_Click(object s, EventArgs e)      { if (ExportClicked != null)    ExportClicked(s, e);    }
        private void importButton_Click(object s, EventArgs e)      { if (ImportClicked != null)    ImportClicked(s, e);    }
        private void compareButton_Click(object s, EventArgs e)     { if (CompareClicked != null)   CompareClicked(s, e);   }
        private void newTabButton_Click(object s, EventArgs e)      { if (NewTabClicked != null)    NewTabClicked(s, e);    }
        private void renameTabButton_Click(object s, EventArgs e)   { if (RenameTabClicked != null) RenameTabClicked(s, e); }
        private void removeTabButton_Click(object s, EventArgs e)   { if (RemoveTabClicked != null) RemoveTabClicked(s, e); }
        private void customButton1_Click(object s, EventArgs e)     { if (Custom1Clicked != null)   Custom1Clicked(s, e);   }
        private void customButton2_Click(object s, EventArgs e)     { if (Custom2Clicked != null)   Custom2Clicked(s, e);   }
        private void customButton3_Click(object s, EventArgs e)     { if (Custom3Clicked != null)   Custom3Clicked(s, e);   }
        
         */
}