using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

using WPFDark.Internals;

namespace WPFDark.Controls
{
    public partial class BiaEditableTextBlockEventHandler
    {
        private void TextBox_Loaded(object sender, RoutedEventArgs e)
        {
            var textBox = (TextBox) sender;

            textBox.CaptureMouse();
            textBox.Focus();
        }

        private string? startText;

        private void TextBlock_OnMouseDown(object sender, MouseButtonEventArgs e)
        {
            var parent = ((BiaTextBlock)sender).GetParent<BiaEditableTextBlock>();

            Debug.Assert(parent != null);

            if (e is { LeftButton: MouseButtonState.Pressed, ClickCount: 2 })
            {
                parent.IsEditing = true;
                startText = parent.Text;
            }

            var listItem = parent.GetParent<ListBoxItem>();
            if (listItem != null)
                listItem.IsSelected = true;
        }

        private void TextBox_LostFocus(object sender, RoutedEventArgs e)
        {
            var textBox = (TextBox) sender;
            var parent = textBox.GetParent<BiaEditableTextBlock>();

            Debug.Assert(parent != null);

            FinishEditing(parent, textBox);
        }

        private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            var textBox = (TextBox) sender;
            var parent = textBox.GetParent<BiaEditableTextBlock>();

            Debug.Assert(parent != null);

            switch (e.Key)
            {
                case Key.Tab:
                    parent.Text = textBox.Text;
                    FinishEditing(parent, textBox);
                    e.Handled = true;
                    break;

                case Key.Return:
                    parent.Text = textBox.Text;
                    FinishEditing(parent, textBox);
                    e.Handled = true;
                    break;

                case Key.Escape:
                    parent.Text = startText;
                    FinishEditing(parent, textBox);
                    e.Handled = true;
                    break;
            }
        }

        private void TextBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            var textBox = (TextBox) sender;

            var rounder = new LayoutRounder(textBox);
            
            // 自コントロール上であれば、終了させない
            var pos = e.GetPosition(textBox);
            var rect = rounder.RoundRenderRectangle(false);
            if (rect.Contains(pos))
                return;

            var parent = textBox.GetParent<BiaEditableTextBlock>();

            Debug.Assert(parent != null);

            FinishEditing(parent, textBox);
        }

        private static void FinishEditing(BiaEditableTextBlock parent, TextBox textBox)
        {
            textBox.ReleaseMouseCapture();

            parent.IsEditing = false;
        }
    }
}