using UnityEngine;
using UnityEngine.UI;

namespace AOT.UI
{
    /// <summary>
    /// 启动更新条（运行时生成，竖屏安全区友好）。
    /// </summary>
    public sealed class BootPatchView : MonoBehaviour
    {
        Text _status;
        Image _fill;

        public static BootPatchView Create()
        {
            var root = new GameObject("BootPatchUI");
            DontDestroyOnLoad(root);

            var canvasGo = new GameObject("Canvas");
            canvasGo.transform.SetParent(root.transform, false);
            var canvas = canvasGo.AddComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = 1000;
            canvasGo.AddComponent<CanvasScaler>().uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            var scaler = canvasGo.GetComponent<CanvasScaler>();
            scaler.referenceResolution = new Vector2(1080, 1920);
            scaler.matchWidthOrHeight = 0.5f;
            canvasGo.AddComponent<GraphicRaycaster>();

            var bg = CreateUiObject("Background", canvasGo.transform);
            var bgImage = bg.AddComponent<Image>();
            bgImage.color = new Color(0.08f, 0.09f, 0.12f, 1f);
            StretchFull(bg.GetComponent<RectTransform>());

            var title = CreateUiObject("Title", canvasGo.transform);
            var titleText = title.AddComponent<Text>();
            titleText.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            titleText.text = "AIGame";
            titleText.alignment = TextAnchor.MiddleCenter;
            titleText.fontSize = 64;
            titleText.color = Color.white;
            var titleRt = title.GetComponent<RectTransform>();
            titleRt.anchorMin = new Vector2(0.1f, 0.62f);
            titleRt.anchorMax = new Vector2(0.9f, 0.72f);
            titleRt.offsetMin = Vector2.zero;
            titleRt.offsetMax = Vector2.zero;

            var statusGo = CreateUiObject("Status", canvasGo.transform);
            var status = statusGo.AddComponent<Text>();
            status.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            status.text = "启动中…";
            status.alignment = TextAnchor.MiddleCenter;
            status.fontSize = 28;
            status.color = new Color(0.85f, 0.88f, 0.92f, 1f);
            var statusRt = statusGo.GetComponent<RectTransform>();
            statusRt.anchorMin = new Vector2(0.1f, 0.42f);
            statusRt.anchorMax = new Vector2(0.9f, 0.5f);
            statusRt.offsetMin = Vector2.zero;
            statusRt.offsetMax = Vector2.zero;

            var barBg = CreateUiObject("ProgressBg", canvasGo.transform);
            var barBgImage = barBg.AddComponent<Image>();
            barBgImage.color = new Color(1f, 1f, 1f, 0.12f);
            var barBgRt = barBg.GetComponent<RectTransform>();
            barBgRt.anchorMin = new Vector2(0.15f, 0.36f);
            barBgRt.anchorMax = new Vector2(0.85f, 0.39f);
            barBgRt.offsetMin = Vector2.zero;
            barBgRt.offsetMax = Vector2.zero;

            var barFill = CreateUiObject("ProgressFill", barBg.transform);
            var fill = barFill.AddComponent<Image>();
            fill.color = new Color(0.35f, 0.75f, 0.55f, 1f);
            var fillRt = barFill.GetComponent<RectTransform>();
            fillRt.anchorMin = Vector2.zero;
            fillRt.anchorMax = new Vector2(0f, 1f);
            fillRt.offsetMin = Vector2.zero;
            fillRt.offsetMax = Vector2.zero;
            fillRt.pivot = new Vector2(0f, 0.5f);

            var view = root.AddComponent<BootPatchView>();
            view._status = status;
            view._fill = fill;
            return view;
        }

        public void SetStatus(string text)
        {
            if (_status != null)
                _status.text = text ?? string.Empty;
        }

        public void SetProgress(float normalized01)
        {
            if (_fill == null) return;
            float v = Mathf.Clamp01(normalized01);
            var rt = _fill.rectTransform;
            rt.anchorMax = new Vector2(v, 1f);
        }

        public void SetError(string message)
        {
            SetStatus(message);
            if (_fill != null)
                _fill.color = new Color(0.85f, 0.3f, 0.3f, 1f);
        }

        static GameObject CreateUiObject(string name, Transform parent)
        {
            var go = new GameObject(name, typeof(RectTransform));
            go.transform.SetParent(parent, false);
            return go;
        }

        static void StretchFull(RectTransform rt)
        {
            rt.anchorMin = Vector2.zero;
            rt.anchorMax = Vector2.one;
            rt.offsetMin = Vector2.zero;
            rt.offsetMax = Vector2.zero;
        }
    }
}