using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEditor.AddressableAssets;
using UnityEditor.AddressableAssets.Settings;
using UnityEditor.AddressableAssets.Settings.GroupSchemas;
using UnityEngine;

namespace BaseGames.Editor
{
    /// <summary>
    /// 可复用的 Addressable 注册器：把资产登记到正确的分组并按规范打标。
    ///
    /// 分组与标签均由 <see cref="AddressableRules"/> 推导（规范来源：
    /// Docs/Standards/AddressablesLabelSpec.md §3 / AssetFolderSpec.md §8），
    /// 因此结果与 <c>AddressableManagerWindow</c>、<c>AddressKeyValidator</c> 完全一致。
    ///
    /// 供各脚手架（如 <c>SceneObjectPlacerTool</c> 创建 Prefab 后）一键注册，
    /// 避免每个工具重复实现 Addressables Settings API。
    /// </summary>
    public static class AddressableRegistrar
    {
        /// <summary>
        /// 将指定路径的资产注册为 Addressable。
        /// 地址默认取文件名（可用 <paramref name="addressOverride"/> 覆盖）；
        /// 分组与标签按 <see cref="AddressableRules"/> 推导，
        /// <paramref name="extraLabels"/> 在规范标签之上追加（如 E003 幼蛭额外的 Poolable/Preload）。
        /// </summary>
        /// <returns>最终写入的地址；Addressables 未初始化或资产不存在时返回 null。</returns>
        public static string Register(string assetPath, string addressOverride = null,
                                      IEnumerable<string> extraLabels = null, List<string> report = null)
        {
            var settings = AddressableAssetSettingsDefaultObject.Settings;
            if (settings == null)
            {
                report?.Add("Addressable Asset Settings 不存在（未初始化），已跳过 Addressable 注册。");
                return null;
            }

            string guid = AssetDatabase.AssetPathToGUID(assetPath);
            if (string.IsNullOrEmpty(guid))
            {
                report?.Add($"资产不存在，无法注册 Addressable：{assetPath}");
                return null;
            }

            string address   = string.IsNullOrEmpty(addressOverride)
                ? System.IO.Path.GetFileNameWithoutExtension(assetPath)
                : addressOverride;
            string groupName = AddressableRules.GetExpectedGroup(address);
            var    group     = groupName != null ? EnsureGroup(settings, groupName) : settings.DefaultGroup;

            var entry = settings.FindAssetEntry(guid)
                     ?? settings.CreateOrMoveEntry(guid, group, false, false);
            if (entry == null)
            {
                report?.Add($"创建 Addressable 条目失败：{assetPath}");
                return null;
            }

            entry.address = address;
            settings.MoveEntry(entry, group, false, false);

            var labels = new HashSet<string>(AddressableRules.GetExpectedLabels(address));
            if (extraLabels != null)
                foreach (var l in extraLabels)
                    if (!string.IsNullOrWhiteSpace(l)) labels.Add(l);
            foreach (var l in labels)
                SetLabel(settings, entry, l);

            settings.SetDirty(AddressableAssetSettings.ModificationEvent.EntryModified, entry, true);
            report?.Add($"✅ Addressable 注册：{address} → 分组 {group.name}"
                        + (labels.Count > 0 ? $"，标签 [{string.Join(", ", labels.OrderBy(x => x))}]" : "，无标签"));
            return address;
        }

        private static AddressableAssetGroup EnsureGroup(AddressableAssetSettings settings, string name)
        {
            var existing = settings.groups.FirstOrDefault(g => g != null && g.name == name);
            if (existing != null) return existing;

            var tmpl    = settings.GroupTemplateObjects.FirstOrDefault() as AddressableAssetGroupTemplate;
            var schemas = tmpl != null ? new List<AddressableAssetGroupSchema>(tmpl.SchemaObjects) : null;
            var created = settings.CreateGroup(name, false, false, true, schemas);
            if (created != null)
                Debug.Log($"[AddressableRegistrar] 已自动创建分组：{name}");
            return created ?? settings.DefaultGroup;
        }

        private static void SetLabel(AddressableAssetSettings settings, AddressableAssetEntry entry, string label)
        {
            if (!settings.GetLabels().Contains(label))
            {
                settings.AddLabel(label, true);
                Debug.Log($"[AddressableRegistrar] 已创建标签：{label}");
            }
            entry.SetLabel(label, true, true);
        }
    }
}