using UnityEngine;
using EerieVillage.Skills;

namespace EerieVillage.MyUI
{
    /// <summary>
    /// BT12-Dev 시각화 HUD — PlayerSkillInventory 등록 상태를 좌상단에 표시.
    /// PD 지시 2026-05-09 — "PlayerSkillInventory 등록이 되었는지 어떻게 판단해야하지?
    /// 시각적인 변화가 없으니 확인이 불가능해. 유니티 기본 제공 리소스를 활용해도 좋으니 보이게 해줘."
    ///
    /// 표시 내용:
    ///   - 장착 액티브 스킬 목록 (DisplayName · Lv · CooldownRemaining/EffectiveCooldown)
    ///   - 패시브 슬롯 카운트
    ///
    /// PlayerController.Awake에서 자동 부착되는 PlayerSkillInventory와 함께 부착.
    /// </summary>
    [RequireComponent(typeof(PlayerSkillInventory))]
    public class SkillInventoryHUD : MonoBehaviour
    {
        PlayerSkillInventory _inventory;
        GUIStyle _boxStyle;

        void Awake()
        {
            _inventory = GetComponent<PlayerSkillInventory>();
        }

        void OnGUI()
        {
            if (_inventory == null) return;

            if (_boxStyle == null)
            {
                _boxStyle = new GUIStyle(GUI.skin.box);
                _boxStyle.alignment = TextAnchor.UpperLeft;
                _boxStyle.fontSize = 14;
                _boxStyle.normal.textColor = Color.white;
                _boxStyle.padding = new RectOffset(10, 10, 6, 6);
                _boxStyle.richText = true;
            }

            var sb = new System.Text.StringBuilder();
            sb.AppendLine("<b><color=#ffd86b>장착 스킬</color></b>");

            int activeCount = 0;
            foreach (var active in _inventory.ActiveSkills)
            {
                if (active == null) continue;
                var data = active.Data;
                if (data == null) continue;
                activeCount++;

                float remaining = 0f;
                float total = 0f;
                if (active is ActiveSkillRuntime rt)
                {
                    remaining = Mathf.Max(0f, rt.CooldownRemaining);
                    total = rt.EffectiveCooldown;
                }

                sb.Append($"{activeCount}. {data.DisplayName} <color=#88c8ff>Lv.{active.StackLevel}</color>");
                if (total > 0f)
                {
                    sb.Append($"  <color=#bbbbbb>CD {remaining:F1}s/{total:F1}s</color>");
                }
                sb.AppendLine();
            }

            if (activeCount == 0)
            {
                sb.AppendLine("<color=#888888>(없음)</color>");
            }

            int passiveCount = _inventory.PassiveSkills.Count;
            sb.AppendLine();
            sb.AppendLine($"<b><color=#a0d8a0>패시브: {passiveCount}장</color></b>");

            // 가변 높이 (라인 수 기반)
            int lines = activeCount + 4 + (activeCount == 0 ? 1 : 0);
            float height = lines * 20f + 16f;
            GUI.Box(new Rect(10f, 10f, 320f, height), sb.ToString(), _boxStyle);
        }
    }
}