using System.Collections.Generic;
using TMPro;
using UnityEngine;

namespace NightclubArcadia.Skills
{
    /// <summary>
    /// Skills tab content. Rebuilds the list from SkillDatabase.All +
    /// PlayerSkills.GetRank on each show. No change event on PlayerSkills —
    /// refresh on show is deliberate (menu is modal; ranks cannot change while open).
    /// </summary>
    public sealed class SkillsPanelView : MonoBehaviour
    {
        [SerializeField] RectTransform contentRoot;
        [SerializeField] SkillRowView rowPrefab;
        [SerializeField] TMP_Text axisHeaderPrefab;
        [SerializeField] int displayMaxRank = 6;

        readonly List<GameObject> spawned = new List<GameObject>();

        /// <summary>
        /// Wired from MenuTabBar TabEntry.onShown in the Inspector.
        /// </summary>
        public void Refresh()
        {
            Clear();

            var runtime = SkillRuntime.Instance;
            if (runtime == null || runtime.Database == null || runtime.Skills == null)
            {
                return;
            }

            if (contentRoot == null || rowPrefab == null)
            {
                Debug.LogWarning($"[{nameof(SkillsPanelView)}] Missing contentRoot or rowPrefab.", this);
                return;
            }

            SkillAxis? currentAxis = null;
            foreach (var def in runtime.Database.All)
            {
                if (def == null || string.IsNullOrEmpty(def.Id))
                {
                    continue;
                }

                if (currentAxis == null || currentAxis.Value != def.Axis)
                {
                    currentAxis = def.Axis;
                    SpawnAxisHeader(def.Axis);
                }

                var rank = runtime.Skills.GetRank(def.Id);
                var row = Instantiate(rowPrefab, contentRoot);
                row.gameObject.SetActive(true);
                row.Bind(def, rank, displayMaxRank);
                spawned.Add(row.gameObject);
            }
        }

        void SpawnAxisHeader(SkillAxis axis)
        {
            if (axisHeaderPrefab == null)
            {
                return;
            }

            var header = Instantiate(axisHeaderPrefab, contentRoot);
            header.gameObject.SetActive(true);
            header.text = axis.ToString().ToUpperInvariant();
            spawned.Add(header.gameObject);
        }

        void Clear()
        {
            for (var i = 0; i < spawned.Count; i++)
            {
                if (spawned[i] != null)
                {
                    Destroy(spawned[i]);
                }
            }

            spawned.Clear();
        }
    }
}