using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using InABox.Core;

namespace InABox.DynamicGrid
{
    public class CodeEditorControl : DynamicEditorControl<string>
    {
        private TextBox Editor;

        protected override FrameworkElement CreateEditor()
        {
            var dock = new DockPanel
            {
                HorizontalAlignment = HorizontalAlignment.Stretch,
                VerticalAlignment = VerticalAlignment.Stretch
            };

            var buttons = CreateButtons(out var DisableEditor);
            foreach (var button in buttons)
            {
                button.SetValue(DockPanel.DockProperty, Dock.Right);
                dock.Children.Add(button);
                dock.Width += button.Width + 5;
            }

            Editor = new TextBox
            {
                CharacterCasing = CharacterCasing.Upper,
                VerticalContentAlignment = VerticalAlignment.Center
            };
            Editor.SetValue(DockPanel.DockProperty, Dock.Left);
            if (DisableEditor)
            {
                Editor.Background = new SolidColorBrush(Colors.Silver);
                Editor.IsEnabled = false;
            }

            Editor.TextChanged += (o, e) => { CheckChanged(); };

            Editor.PreviewTextInput += Editor_PreviewTextInput;
            DataObject.AddPastingHandler(Editor, Editor_TextPaste);

            dock.Children.Add(Editor);

            return dock;
        }

        private void Editor_TextPaste(object sender, DataObjectPastingEventArgs e)
        {
            if (e.DataObject.GetDataPresent(typeof(string)))
            {
                var allowable = (EditorDefinition as BaseCodeEditor)?.ValidChars;
                var text = (string)e.DataObject.GetData(typeof(string));
                if (!IsTextAllowed(text, allowable))
                    e.CancelCommand();
            }
            else
            {
                e.CancelCommand();
            }
        }

        private bool IsTextAllowed(string text, string allowable)
        {
            if (string.IsNullOrWhiteSpace(allowable))
                return true;
            return Array.TrueForAll(text.ToCharArray(), delegate(char c) { return allowable.Contains(c); });
        }

        private void Editor_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            var allowable = (EditorDefinition as BaseCodeEditor)?.ValidChars;
            e.Handled = !IsTextAllowed(e.Text, allowable);
        }

        public override int DesiredHeight()
        {
            return 25;
        }

        public override int DesiredWidth()
        {
            var result = 150;
            var btnEditor = EditorDefinition as IButtonEditor;
            if (btnEditor?.Buttons != null)
                foreach (var button in ((IButtonEditor)EditorDefinition).Buttons)
                    result += button.Width + 5;
            return result;
        }

        protected override string RetrieveValue()
        {
            return Editor.Text;
        }

        protected override void UpdateValue(string value)
        {
            Editor.Text = value;
        }

        public override void SetFocus()
        {
            Editor.Focus();
        }

        public override void SetColor(Color color)
        {
            Editor.Background = new SolidColorBrush(color);
        }
    }
}