using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevComponents.DotNetBar;
using C1.Win.C1SpellChecker;

namespace Volian.Controls.Library
{
	// Our custom Spell Checker dialog
	public partial class VlnSpellCheckDlg : DevComponents.DotNetBar.Office2007Form, ISpellDialog
	{
		private C1SpellChecker _Spell;
		private ISpellCheckableEditor _Editor;
		private CharRangeList _Errors;
		private int _ErrorCount;
		private int _ErrorIndex = -1;       // current error index
		private bool _AutoSuggest = true;
		private string _NoSuggestionsText = "(no suggestions)";

		Dictionary<string, string> _changeAll = new Dictionary<string, string>();

		/// <summary>
		/// Gets the <see cref="CharRange"/> object that represents the error currently 
		/// displayed in the dialog.
		/// </summary>
		public CharRange CurrentError
		{
			get { return _Errors[_ErrorIndex]; }
		}
		public bool DidCorrectSpelling = false;  // B2015-024  have Spell Checker text changes be in editorial mode (not assign a change bar but keep existing change bar)

		public VlnSpellCheckDlg()
		{
			InitializeComponent();
		}
		/// <summary>
		/// Initializes the dialog to use the given parameters.
		/// </summary>
		/// <param name="spell"><see cref="C1SpellChecker"/> to use for spelling.</param>
		/// <param name="editor"><see cref="ISpellCheckableEditor"/> that contains the text to spell-check.</param>
		/// <param name="errors"><see cref="CharRangeList"/> that contains the initial error list.</param>
		public void Initialize(C1SpellChecker spell, ISpellCheckableEditor editor, CharRangeList errors)
		{
			_Spell = spell;
			_Editor = editor;
			_Errors = errors;
			if (_Errors == null)
			{
				_Errors = _Spell.CheckText(_Editor.Text);
			}
			_ErrorCount += _Errors.Count;
			btnAddToDictionary.Visible = _Spell.UserDictionary.Enabled;
		}
		/// <summary>
		/// Gets the total number of errors detected in the control.
		/// </summary>
		public int ErrorCount
		{
			get { return _ErrorCount; }
		}

		/// <summary>
		/// Gets or sets the index of the current error into the <see cref="Errors"/> list.
		/// </summary>
		public int ErrorIndex
		{
			get { return _ErrorIndex; }
			set
			{
				_ErrorIndex = value;
				UpdateCurrentError();
			}
		}

		private void UpdateEditor(string replacement)
		{
			DidCorrectSpelling = true;
			// save starting point to continue checking from here
			int start = CurrentError.Start;

			if (replacement.Length == 0)
			{
				// if replacement is empty, expand over spaces and commas
				CharRange delete = CharRange.ExpandOverWhitespace(_Editor.Text, CurrentError);
				_Editor.Select(delete.Start, delete.Text.Length);
			}

			// replace word in text and re-check
			_Editor.SelectedText = replacement;
			_Errors = _Spell.CheckText(_Editor.Text, start);

			// update index
			ErrorIndex = ErrorIndex; // originally 0;
		}

		/// <summary>
		/// Raises the <see cref="Form.Load"/> event.
		/// </summary>
		/// <param name="e"><see cref="EventArgs"/> that contains the event data.</param>
		protected override void OnLoad(EventArgs e)
		{
			// fire load event
			base.OnLoad(e);
			//AddHandle();
			// show first error (after firing load event)
			ErrorIndex = 0;
		}
		// added for debugging - comment out when not using
		//public void AddHandle()
		//{
		//	if (!Handles.Contains(this.Handle))
		//	{
		//		GC.Collect();
		//		Handles.Add(this.Handle);
		//		Console.WriteLine("Handles {0}, RTB Count Created {1}, RTB Count Not Disposed = {2} ", Handles.Count,StepRTB.CountCreated,StepRTB.CountNotDisposed);
				
		//	}
		//}
		//private static List<IntPtr> Handles = new List<IntPtr>();

		private bool _Initializing = false;
		private string _OrgWord;

		// update dialog to show current error
		private void UpdateCurrentError()
		{
			// design time
			if (DesignMode || _Errors == null)
			{
				return;
			}
			// finished with this batch of errors
			if (ErrorIndex >= _Errors.Count)
			{
				// check whether the editor has more text to check
				while (_Editor.HasMoreText())
				{
					_Errors = _Spell.CheckText(_Editor.Text);
					if (_Errors.Count > 0)
					{
						_ErrorCount += _Errors.Count;
						ErrorIndex = 0;
						return;
					}
				}

				// editor has no more text...
				DialogResult = DialogResult.OK;
				return;
			}

			// update current error
			CharRange err = CurrentError;

			// select word in editor
			_Editor.Select(err.Start, err.Text.Length);

			// honor 'change all' list
			if (_changeAll.ContainsKey(err.Text))
			{
				txbBadWord.Text = _changeAll[err.Text];
				btnChange_Click(this, EventArgs.Empty);
				return;
			}

			_Initializing = true;
			// show bad word, new text
			txbBadWord.Text = _OrgWord = err.Text;

			// repeated word?
			if (err.Duplicate)
			{
				// adjust dialog
				lblNotInDictionary.Text = "Duplicate Word";
				btnIgnoreAll.Enabled = false;
				btnAddToDictionary.Enabled = false;
				btnRemove.Enabled = true;

				// no suggestions
				lbSuggestList.Items.Clear();
			}
			else
			{
				// adjust dialog
				lblNotInDictionary.Text = "Not In Dictionary";
				btnIgnoreAll.Enabled = true;
				btnAddToDictionary.Enabled = true;
				btnRemove.Enabled = false;

				SetupSuggestions(err.Text);
			}

			// focus to new word
			_AutoSuggest = false;
			txbBadWord.SelectAll();
			txbBadWord.Focus();
			_AutoSuggest = true;
			AcceptButton = btnIgnore;
			
			// show 'Add' button only if user dictionary is enabled
			btnAddToDictionary.Visible = _Spell.UserDictionary.Enabled;

			// all ready, fire ErrorDisplayed event
			//OnErrorDisplayed(EventArgs.Empty);
		}

		private void SetupSuggestions(string badWord)
		{
			// show suggestions
			_Initializing = true;
			string[] suggestions = _Spell.GetSuggestions(badWord);
			lbSuggestList.Items.Clear();
			if (suggestions.Length > 0)
			{
				lbSuggestList.Items.AddRange(suggestions);
				lbSuggestList.SelectedIndex = -1;
				lbSuggestList.Enabled = true;
			}
			else
			{
				lbSuggestList.Items.Add(_NoSuggestionsText);
				lbSuggestList.SelectedIndex = -1;
				lbSuggestList.Enabled = false;
			}
			_Initializing = false;
		}

		private void txbBadWord_TextChanged(object sender, EventArgs e)
		{
			btnChange.Enabled = (_OrgWord != txbBadWord.Text);
			btnChangeAll.Enabled = btnChange.Enabled && lblNotInDictionary.Text == "Not In Dictionary";
			btnAddToDictionary.Enabled = _Spell.UserDictionary.Enabled && !InDictionary(txbBadWord.Text);
			if (_AutoSuggest && !_Initializing)
			{
				SetupSuggestions(txbBadWord.Text);
			}
		}

		private bool InDictionary(string word)
		{
			if (_Spell.MainDictionary.Contains(word))
				return true;
			if (_Spell.CustomDictionary != null && _Spell.CustomDictionary.Contains(word))
				return true;
			if (_Spell.UserDictionary != null && _Spell.UserDictionary.Contains(word))
				return true;
			return false;
		}

		private void btnChange_Click(object sender, EventArgs e)
		{
			UpdateEditor(txbBadWord.Text);
		}

		private void btnChangeAll_Click(object sender, EventArgs e)
		{
			_changeAll[CurrentError.Text] = txbBadWord.Text;
			UpdateEditor(txbBadWord.Text);
		}

		private void btnIgnore_Click(object sender, EventArgs e)
		{
			ErrorIndex++;
		}

		private void btnIgnoreAll_Click(object sender, EventArgs e)
		{
			//Console.WriteLine("handle: {0}", this.Handle);
			_Spell.IgnoreList.Add(CurrentError.Text);
			_Errors = _Spell.CheckText(_Editor.Text, CurrentError.Start);
			UpdateCurrentError();
		}

		private void btnAddToDictionary_Click(object sender, EventArgs e)
		{
			_Spell.UserDictionary.AddWord(CurrentError.Text);
			_Errors = _Spell.CheckText(_Editor.Text, CurrentError.Start);
			ErrorIndex = 0;
		}

		private void lbSuggestList_SelectedIndexChanged(object sender, EventArgs e)
		{
			_AutoSuggest = false;
			if (!_Initializing && lbSuggestList.Text != _NoSuggestionsText)
				txbBadWord.Text =  lbSuggestList.Text;
			_AutoSuggest = true;
		}

		// double-click selects word for suggestion list and changes mis-spelled word
		private void lbSuggestList_DoubleClick(object sender, EventArgs e)
		{
			if (txbBadWord.Text == lbSuggestList.Text)
			{
				UpdateEditor(txbBadWord.Text);
			}
		}

		private void btnRemove_Click(object sender, EventArgs e)
		{
			UpdateEditor("");
		}
	}
}