using UnityEngine;
using UnityEngine.UI;

namespace Vanguard.UI
{
    /// <summary>
    /// Фон экрана входа: key art на весь экран (cover) и затемнение по краям.
    /// Арт лежит в Resources, потому что Addressables в клиенте ещё не подключены.
    /// </summary>
    public static class LoginBackdrop
    {
        private const string ResourcePath = "Login/login_bg";

        public static RectTransform Create(Transform parent)
        {
            var rootGo = new GameObject("LoginBackdrop", typeof(RectTransform));
            var root = (RectTransform)rootGo.transform;
            root.SetParent(parent, false);
            UiKit.Stretch(root);
            root.SetAsFirstSibling();

            var texture = Resources.Load<Texture2D>(ResourcePath);

            if (texture != null)
            {
                var artGo = new GameObject(
                    "Art",
                    typeof(RectTransform),
                    typeof(Image),
                    typeof(AspectRatioFitter));
                var art = (RectTransform)artGo.transform;
                art.SetParent(root, false);
                UiKit.Stretch(art);

                var image = artGo.GetComponent<Image>();
                image.sprite = Sprite.Create(
                    texture,
                    new Rect(0f, 0f, texture.width, texture.height),
                    new Vector2(0.5f, 0.5f),
                    100f);
                image.type = Image.Type.Simple;
                image.preserveAspect = false;
                image.raycastTarget = false;

                var fitter = artGo.GetComponent<AspectRatioFitter>();
                fitter.aspectMode = AspectRatioFitter.AspectMode.EnvelopeParent;
                fitter.aspectRatio = texture.width / (float)texture.height;
            }
            else
            {
                // Арта нет — тёмная заливка, экран не должен падать.
                var fallback = UiKit.CreatePanel(
                    root, "Fallback", new Color(0.02f, 0.05f, 0.13f, 1f));
                fallback.GetComponent<Image>().raycastTarget = false;
            }

            var shade = NeonUi.AddImage(
                root,
                "Shade",
                NeonUi.Vignette(
                    480,
                    270,
                    new Color(0f, 0f, 0f, 0.08f),
                    new Color(0.004f, 0.016f, 0.055f, 0.72f)),
                new Vector2(480f, 270f),
                Vector2.zero);
            shade.preserveAspect = false;
            UiKit.Stretch(shade.rectTransform);

            return root;
        }
    }
}