using System.Collections;
using AOT.Boot;
using UnityEngine;
using YooAsset;

namespace HotUpdate
{
    /// <summary>
    /// 加载人物角色 Explorer 的独立预览（地址 CaoCao）。
    /// </summary>
    public sealed class CharacterSpawner : MonoBehaviour
    {
        public const string PrefabAddress = "Explorer";
        public const string EditorPrefabPath = "Assets/Bundles/Characters/Human/Explorer/Explorer.prefab";
        public const string ArtPackageName = "Art";

        BootContext _ctx;
        GameObject _instance;

        public void Bind(BootContext ctx) => _ctx = ctx;

        public void Spawn()
        {
            StartCoroutine(SpawnCo());
        }

        IEnumerator SpawnCo()
        {
            GameObject prefab = null;

            // 1) YooAsset Art 包（Offline/Host 已初始化时）
            if (YooAssets.IsInitialized && YooAssets.TryGetPackage(ArtPackageName, out var art) &&
                art.InitializeStatus == EOperationStatus.Succeeded)
            {
                var handle = art.LoadAssetAsync<GameObject>(PrefabAddress);
                yield return handle;
                if (handle.Status == EOperationStatus.Succeeded)
                {
                    prefab = handle.GetAssetObject<GameObject>();
                    Debug.Log($"[CharacterSpawner] loaded from YooAsset Art address={PrefabAddress}");
                }
                else
                {
                    Debug.LogWarning($"[CharacterSpawner] Art load failed: {handle.Error}");
                    handle.Release();
                }
            }

            // 2) 编辑器直通：AssetDatabase
#if UNITY_EDITOR
            if (prefab == null)
            {
                prefab = UnityEditor.AssetDatabase.LoadAssetAtPath<GameObject>(EditorPrefabPath);
                if (prefab != null)
                    Debug.Log($"[CharacterSpawner] loaded via AssetDatabase {EditorPrefabPath}");
            }
#endif

            if (prefab == null)
            {
                Debug.LogError("[CharacterSpawner] Explorer prefab not found");
                yield break;
            }

            if (_instance != null)
                Destroy(_instance);

            _instance = Instantiate(prefab);
            _instance.name = "Explorer_Runtime";
            var y = GroundSit.Height(Vector3.zero, null);
            _instance.transform.position = new Vector3(0f, y, 0f);
            DontDestroyOnLoad(_instance);

            var billboardTf = _instance.transform.Find("Billboard");
            if (billboardTf != null && Camera.main != null)
            {
                var cam = Camera.main.transform;
                var dir = cam.position - billboardTf.position;
                dir.y = 0f;
                if (dir.sqrMagnitude > 0.001f)
                    billboardTf.rotation = Quaternion.LookRotation(-dir.normalized);
            }

            if (Camera.main != null)
            {
                var cam = Camera.main;
                cam.transform.position = new Vector3(0f, 1.2f, -2.2f);
                cam.transform.rotation = Quaternion.Euler(8f, 0f, 0f);
                cam.fieldOfView = 50f;
                cam.backgroundColor = new Color(0.45f, 0.62f, 0.78f);
            }

            Debug.Log($"[CharacterSpawner] spawned ok res={_ctx?.ResVersion}");
        }
    }
}