using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Foundation.Metadata;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;

namespace Monaco.Helpers
{
    public delegate void WebKeyEventHandler(CodeEditor sender, WebKeyEventArgs args);

    public sealed class WebKeyEventArgs
    {
        public int KeyCode { get; set; }

        // TODO: Make these some sort of flagged state enum?
        public bool CtrlKey { get; set; }
        public bool ShiftKey { get; set; }
        public bool AltKey { get; set; }
        public bool MetaKey { get; set; }

        public bool Handled { get; set; }
    }

    [AllowForWeb]
    public sealed class KeyboardListener
    {
        private WeakReference<CodeEditor> parent;

        public KeyboardListener(CodeEditor parent) // TODO: Make Interface for event usage
        {
            this.parent = new WeakReference<CodeEditor>(parent);
        }

        /// <summary>
        /// Called from JavaScript, returns if event was handled or not.
        /// </summary>
        /// <param name="keycode"></param>
        /// <param name="ctrl"></param>
        /// <param name="shift"></param>
        /// <param name="alt"></param>
        /// <param name="meta"></param>
        /// <returns></returns>
        public bool KeyDown(int keycode, bool ctrl, bool shift, bool alt, bool meta)
        {
            if (parent.TryGetTarget(out CodeEditor editor))
            {
                return editor.TriggerKeyDown(new WebKeyEventArgs()
                {
                    KeyCode = keycode, // TODO: Convert to a virtual key or something?
                    CtrlKey = ctrl,
                    ShiftKey = shift,
                    AltKey = alt,
                    MetaKey = meta
                });
            }

            return false;
        }
    }
}