using System;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UIElements;

namespace DanieleMarotta.RiversongCodeShowcase
{
    [UIView("runtime-tooltip")]
    public class RuntimeTooltipUIView : UIView
    {
        private Label _content;

        public override UniTask InitializeAsync(UIService uiService, VisualElement rootElement)
        {
            base.InitializeAsync(uiService, rootElement);

            _content = rootElement.Q<Label>(className: "runtime-tooltip__content");

            RootElement.SetPickingModeRecursive(PickingMode.Ignore);

            return UniTask.CompletedTask;
        }

        public void AnchorTooltip(VisualElement anchor, string text)
        {
            _content.text = text;

            var placeAbove = anchor.worldBound.center.y > Screen.height * 0.2f;

            RootElement.EnableInClassList("runtime-tooltip--above", placeAbove);
            RootElement.EnableInClassList("runtime-tooltip--below", !placeAbove);
            
            RootElement.schedule.Execute(() => ClampToScreen(anchor.worldBound, placeAbove));
        }

        private void ClampToScreen(Rect anchor, bool placeAbove)
        {
            var width = RootElement.resolvedStyle.width;
            var height = RootElement.resolvedStyle.height;
            if (width <= 0 || height <= 0) return;

            var left = Mathf.Clamp(anchor.center.x - width / 2, 0, Mathf.Max(0, Screen.width - width));

            const float verticalGap = 32;
            var top = placeAbove ? anchor.yMin - verticalGap - height : anchor.yMax + verticalGap;
            top = Mathf.Clamp(top, 0, Mathf.Max(0, Screen.height - height));

            RootElement.style.left = left + width / 2;
            RootElement.style.top = placeAbove ? top + height : top;
        }
    }
}