using Microsoft.AspNetCore.Components;
using Microsoft.JSInterop;
using System.Reflection;

namespace HotelPms.Client.Blazor.Util
{
    public static class ElementReferenceEx
    {
        private static readonly PropertyInfo jsRuntimeProperty = typeof(WebElementReferenceContext).GetProperty("JSRuntime", BindingFlags.Instance | BindingFlags.NonPublic);

        internal static IJSRuntime GetJSRuntime(this ElementReference elementReference)
        {
            if (elementReference.Context is not WebElementReferenceContext context)
            {
                return null;
            }

            return (IJSRuntime)jsRuntimeProperty.GetValue(context);
        }

        /// <summary>
        /// input[text] or textarea
        /// </summary>
        /// <param name="elementReference"></param>
        /// <returns></returns>
        public static ValueTask<string> GetInputValue(this ElementReference elementReference)
        {
            return elementReference.GetJSRuntime()?.InvokeAsync<string>("NetCallJs.getInputValue", elementReference) ?? ValueTask.FromResult(string.Empty);
        }

        /// <summary>
        /// input[text] or textarea
        /// </summary>
        /// <param name="elementReference"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static ValueTask SetInputValue(this ElementReference elementReference, string value) => elementReference.GetJSRuntime()?.InvokeVoidAsync("NetCallJs.setInputValue", elementReference, value) ?? ValueTask.CompletedTask;

        public static ValueTask<BoundingClientRect> GetClientRect(this ElementReference elementReference)
        {
            return elementReference.GetJSRuntime()?.InvokeAsync<BoundingClientRect>("NetCallJs.getClientRect", elementReference) ?? ValueTask.FromResult(new BoundingClientRect());
        }

        public static ValueTask<ScrollPosition> GetScroll(this ElementReference elementReference)
        {
            return elementReference.GetJSRuntime()?.InvokeAsync<ScrollPosition>("NetCallJs.getScroll", elementReference) ?? ValueTask.FromResult(new ScrollPosition());
        }
    }
}