using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace IdleSpectator;

/// <summary>
/// Screen-space count badges over multi-entry grave stacks (pooled, on-screen only).
/// </summary>
public static class GraveCountBadges
{
    private const int PoolSize = 64;
    private static readonly List<GraveMarkers.GraveStack> Scratch = new List<GraveMarkers.GraveStack>(256);
    private static readonly List<Badge> Pool = new List<Badge>(PoolSize);
    private static Transform _root;
    private static bool _built;

    private sealed class Badge
    {
        public GameObject Go;
        public RectTransform Rt;
        public Text Label;
    }

    /// <summary>Badges retired - stack size lives in Lore title. Kept so old pools hide cleanly.</summary>
    public static void Hide()
    {
        for (int i = 0; i < Pool.Count; i++)
        {
            if (Pool[i].Go != null)
            {
                Pool[i].Go.SetActive(false);
            }
        }
    }

    public static void Update()
    {
        Hide();
    }

    private static void EnsureBuilt()
    {
        if (_built)
        {
            return;
        }

        Canvas canvas = HudCanvas.Resolve();
        if (canvas == null)
        {
            return;
        }

        GameObject rootGo = new GameObject("IdleGraveCountBadges", typeof(RectTransform));
        rootGo.transform.SetParent(canvas.transform, false);
        _root = rootGo.transform;
        RectTransform rootRt = rootGo.GetComponent<RectTransform>();
        rootRt.anchorMin = Vector2.zero;
        rootRt.anchorMax = Vector2.one;
        rootRt.offsetMin = Vector2.zero;
        rootRt.offsetMax = Vector2.zero;

        for (int i = 0; i < PoolSize; i++)
        {
            GameObject go = new GameObject("Badge" + i, typeof(RectTransform), typeof(Image));
            go.transform.SetParent(_root, false);
            RectTransform rt = go.GetComponent<RectTransform>();
            rt.sizeDelta = new Vector2(14f, 10f);
            Image img = go.GetComponent<Image>();
            img.color = HudTheme.ToolFill;
            img.raycastTarget = false;
            Text label = HudCanvas.MakeText(go.transform, "N", "2", 8);
            RectTransform lrt = label.GetComponent<RectTransform>();
            lrt.anchorMin = Vector2.zero;
            lrt.anchorMax = Vector2.one;
            lrt.offsetMin = Vector2.zero;
            lrt.offsetMax = Vector2.zero;
            label.alignment = TextAnchor.MiddleCenter;
            label.color = HudTheme.AccentGold;
            label.raycastTarget = false;
            go.SetActive(false);
            Pool.Add(new Badge { Go = go, Rt = rt, Label = label });
        }

        _built = true;
    }
}