using NightclubArcadia.Dialogue;
using TMPro;
using UnityEngine;
using Yarn.Unity;

namespace NightclubArcadia.UI.Menu
{
    /// <summary>
    /// Character tab stub: shows player name / alias from Yarn variable storage
    /// and an empty inventory placeholder.
    /// </summary>
    public sealed class CharacterPanelView : MonoBehaviour
    {
        [SerializeField] TMP_Text nameLabel;
        [SerializeField] TMP_Text aliasLabel;
        [SerializeField] TMP_Text inventoryPlaceholder;
        [SerializeField] DialogueRunner dialogueRunner;

        // No OnEnable refresh: panels are toggled via CanvasGroup, so OnEnable
        // fires exactly once during scene load — before the DialogueRunner has
        // initialised its variables. MenuTabBar calls Refresh on tab show,
        // which is both correctly timed and repeatable.
        public void Refresh()
        {
            if (dialogueRunner == null)
            {
                dialogueRunner = FindFirstObjectByType<DialogueRunner>();
            }

            var storage = dialogueRunner != null ? dialogueRunner.VariableStorage : null;

            if (nameLabel != null)
            {
                nameLabel.text = ReadString(storage, "$player_name_full", "Unknown");
            }

            if (aliasLabel != null)
            {
                // $player_alias is a *smart* variable
                //   <<declare $player_alias = alias_name($player_name) as string>>
                // and Yarn's Unity runtime never assigns
                // VariableStorageBehaviour.SmartVariableEvaluator, so reading it
                // through TryGetValue always throws InvalidOperationException.
                // Derive it from $player_name with the same generator the Yarn
                // function wraps — deterministic, so the result is identical.
                var realName = ReadString(storage, "$player_name", string.Empty);
                aliasLabel.text = string.IsNullOrEmpty(realName)
                    ? "—"
                    : AliasNameGenerator.AliasName(realName);
            }

            if (inventoryPlaceholder != null)
            {
                inventoryPlaceholder.text = "Inventory — empty";
            }
        }

        static string ReadString(VariableStorageBehaviour storage, string key, string fallback)
        {
            if (storage == null)
            {
                return fallback;
            }

            try
            {
                if (storage.TryGetValue<string>(key, out var value) && !string.IsNullOrEmpty(value))
                {
                    return value;
                }
            }
            catch (System.InvalidOperationException)
            {
                // Smart variables, and variables read before the runner has a
                // compiled Program, throw rather than returning false. A HUD
                // panel showing a fallback string is the right failure mode.
            }

            return fallback;
        }
    }
}