<?php

namespace App\Services\Nasa;

use App\Models\Nasa\Navigation as NasaNavigation;
use Illuminate\Support\Collection;

class NavigationService
{
    public function aGetInfo($sCurrentPermissionSlug): array
    {
        // 1. 获取当前高亮的菜单节点
        $oCurrentMenu = NasaNavigation::where("sPermissionSlug", $sCurrentPermissionSlug)
            ->available()
            ->first();

        if (!$oCurrentMenu) {
            return [
                "aTopMenus" => $this->aGetTopMenus(),
                "aSubMenus" => [],
                "aTabMenus" => [],
                "aMenuPath" => [],
            ];
        }

        $aTopMenus = $this->aGetTopMenus();
        
        // 2. 获取面包屑的原始集合（链条顺序依然是：[一级, 二级, 三级...]）
        $cMenuPathCollection = $oCurrentMenu->cGetAncestorsAndSelf();
        
        // ================= 核心修改：利用 keyBy 将 sComponentType 作为键 =================
        // 它会自动将数组转换为：['TOP_BAR' => [...], 'LEFT_MENU' => [...]] 的高内聚结构
        $aMenuPath = $cMenuPathCollection->keyBy('sComponentType')->toArray();
        // ==============================================================================

        // 3. 提取一级根节点（注意：集合 keyBy 后内部指针会变，所以我们从原集合中安全 get(0) 获取一级）
        $oRootMenu = $cMenuPathCollection->first();
        
        $aSubMenus = [];
        $aTabMenus = [];

        if ($oRootMenu) {
            // 拉出该顶级菜单下的所有无限级子树
            $oRootMenuWithTree = NasaNavigation::with('childrenRecursive')
                ->where('id', $oRootMenu->id)
                ->first();

            if ($oRootMenuWithTree && $oRootMenuWithTree->childrenRecursive) {
                // 【二级侧边栏逻辑】：保持原样
                $aSubMenus = $oRootMenuWithTree->childrenRecursive
                    ->transform(function (NasaNavigation $oSubMenu) {
                        $oSubMenu->sUrl = $oSubMenu->sGetFinalUrl();
                        return $oSubMenu;
                    })
                    ->groupBy('sGroup')
                    ->toArray();

                // ================= 三级 Tab 菜单解析优化 =================
                // 以前是通过 ->get(1) 硬编码拿二级。现在既然改了结构，
                // 我们可以直接通过你定义的二级类型键（假设叫 TYPE_SIDE_BAR，请根据你 Model 里的常量自行替换）安全捞取
                $oLevel2Menu = $cMenuPathCollection->firstWhere('sComponentType', NasaNavigation::TYPE_SIDEBAR_MENU);

                if ($oLevel2Menu) {
                    // 去子树内存里捞出这个二级节点
                    $oCurrentLevel2InTree = $oRootMenuWithTree->childrenRecursive
                        ->firstWhere('id', $oLevel2Menu->id);

                    if ($oCurrentLevel2InTree && $oCurrentLevel2InTree->childrenRecursive->isNotEmpty()) {
                        $aTabMenus = $oCurrentLevel2InTree->childrenRecursive
                            ->transform(function (NasaNavigation $oTabMenu) {
                                $oTabMenu->sUrl = $oTabMenu->sGetFinalUrl();
                                return $oTabMenu;
                            })
                            ->toArray();
                    }
                }
            }
        }

        return [
            "aTopMenus" => $aTopMenus,
            "aSubMenus" => $aSubMenus,
            "aTabMenus" => $aTabMenus,
            "aMenuPath" => $aMenuPath, // 这里的键已经是你的组件类型字符串了
        ];
    }
    
    
    /**
     * 获取全局顶级大区 (TOP_BAR)
     */
    public function aGetTopMenus(): array
    {
        return NasaNavigation::with('childrenRecursive') // 一口气拉出无限级树结构，只有 2-3 条 SQL
            ->where('iParentId', 0)
            ->where('sComponentType', NasaNavigation::TYPE_TOP_BAR)
            ->available()
            ->orderBy('iSort', 'asc')
            ->get()
            ->transform(function (NasaNavigation $oMenu) {
                // 让顶级菜单自己去递归嗅探最底层的有效 URL
                $oMenu->sUrl = $oMenu->sGetFinalUrl();
                return $oMenu;
            })
            ->groupBy('sGroup')
            ->toArray();
    }

    /**
     * 抓取侧边栏业务菜单树
     */
    public function aGetSubMenus($iParentId): Array
    {
        return NasaNavigation::where('iParentId', $iParentId)
            ->where('sComponentType', NasaNavigation::TYPE_SIDEBAR_MENU)
            ->available()
            ->orderBy('iSort', 'asc')
            ->get()
            ->map(function ($oMenu) {
                // 将模型转成数组
                $aMenu = $oMenu->toArray();
                
                // 🎯 核心防空伞：动态算好 sUrl，有就给，没有就给空字符串 ''
                $aMenu['sUrl'] = \Illuminate\Support\Facades\Route::has($oMenu->sPermissionSlug)
                    ? route($oMenu->sPermissionSlug)
                    : '';
                    
                return $aMenu;
            })
            ->groupBy('sGroup')
            ->toArray();
    }
    
}