using System;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Forms.Integration;
using System.Windows.Forms.Design;
using System.Windows.Documents;
using ToGetSpellCheck;


[Designer(typeof(ControlDesigner))]
class SpellCheck : ElementHost
{
    private TextBox box;
    public SpellCheck()
    {
        box = new TextBox();
        base.Child = box;
        box.TextChanged += (s, e) => OnTextChanged(EventArgs.Empty);
        box.SpellCheck.IsEnabled = true;
        box.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
        this.Size = new System.Drawing.Size(100, 50);
        box.PreviewMouseMove += OpenContextMenuOnMouseMove;
    }

    private void OpenContextMenuOnMouseMove(object sender, System.Windows.Input.MouseEventArgs mouseEventArgs)
    {


        var textBox = sender as System.Windows.Controls.TextBox;

        var mouseOverTextIndex = textBox.GetCharacterIndexFromPoint(mouseEventArgs.GetPosition(textBox), false);
        int spellingErrorIndex = textBox.GetNextSpellingErrorCharacterIndex(mouseOverTextIndex, LogicalDirection.Forward);

        // Pointer is not over text or no spelling errors
        if (mouseOverTextIndex.Equals(-1) || spellingErrorIndex.Equals(-1))
        {
            return;
        }

        int startOfWordIndex = mouseOverTextIndex;
        while (startOfWordIndex != -1 && !textBox.Text[startOfWordIndex].Equals(' '))
        {
            startOfWordIndex--;
        }

        var endOfWordIndex = textBox.Text.IndexOf(" ", mouseOverTextIndex, StringComparison.OrdinalIgnoreCase);

        if (endOfWordIndex.Equals(-1))
        {
            endOfWordIndex = textBox.Text.Length - 1;
        }

        //  Spelling error doesn't belong to current mouse over word
        if (spellingErrorIndex < startOfWordIndex || spellingErrorIndex > endOfWordIndex)
        {
            return;
        }

        using (CustomPopup popup = new CustomPopup())
        {

            foreach (var suggestion in textBox.GetSpellingError(spellingErrorIndex).Suggestions)
            {
                var suggestionButton = new System.Windows.Forms.Button() { Text = suggestion };
                var eventArgs = new FixSpellingErrorEventArgs()
                {
                    TextBox = textBox,
                    WordStartIndex = startOfWordIndex,
                    WordEndIndex = endOfWordIndex,
                    Suggestion = suggestion
                };

                suggestionButton.Click += (s, e) => FixSpellingError(eventArgs);

                popup.FlowLayoutPanel1.Controls.Add(suggestionButton);
            }

            popup.SetDesktopLocation((int)mouseEventArgs.GetPosition(textBox).X, (int)mouseEventArgs.GetPosition(textBox).Y);

            popup.ShowDialog(this);
        }

    }

    private void FixSpellingError(FixSpellingErrorEventArgs e)
    {
        e.TextBox.SelectionStart = e.WordStartIndex;
        e.TextBox.SelectionLength = e.WordEndIndex - e.WordStartIndex;
        e.TextBox.SelectedText = e.Suggestion;
    }

    class FixSpellingErrorEventArgs : EventArgs
    {
        public System.Windows.Controls.TextBox textBox { get; set; }
        public int WordStartIndex { get; set; }
        public int WordEndIndex { get; set; }
        public string Suggestion { get; set; }

    }

}