<?php

namespace App\Services;

use App\Authority;
use App\Traits\ServiceAppAop;
use App\Menu;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Cache;

class MenuService
{
    use ServiceAppAop;
    protected $modelClass=Menu::class;

    public function getMenu()
    {
        if (!Cache::has("menus")){
            if (Cache::lock("menus",2)){
                $this->setMenu();
                Cache::lock("menus")->release();
            }else{
                sleep(1);
                return Cache::get("menus") ?? [];
            }
        }
        return Cache::get("menus");
    }

    public function removeMenuMapping()
    {
        Cache::tags("AUTHORITY_MENU_MAPPING")->flush();
    }
    public function setMenu()
    {
        //如果需要热更新 为所有用户个人菜单锁定缓存 标记TAGS 在此清除 Cache::tag("tags")->flush()
        Cache::forever("menus",Menu::query()
            ->select("id","name","parent_id","route","font","font_style")
            ->orderByRaw("level DESC,sequence")->get());
        $this->removeMenuMapping();
    }

    public function appendMenu(Menu $menu)
    {
        $menus = $this->getMenu();
        if ($menus){
            $menus->add($menu);
            Cache::forever("menus",$menus);
        }
        $this->removeMenuMapping();
    }

    //菜单与权限关联依据为 name与parent_id字段 当两个表中任意此字段发生变更 必须刷掉缓存
    public function getVisibleFunctionList($authorities = null,&$mapping = []):array
    {
        $userId = Auth::id();
        $isCache = !$authorities && !$mapping && $userId;
        if ($isCache && Cache::tags("AUTHORITY_MENU_MAPPING")->has("am_mapping_".$userId))
            return Cache::tags("AUTHORITY_MENU_MAPPING")->get("am_mapping_".$userId);
        /** @var Collection $authorities */
        if (!$authorities)$authorities = app("AuthorityService")->getUserAuthorityData();
        $authMap = app("AuthorityService")->format($authorities);
        $menus = $this->format($this->getMenu());
        $result = array_values($this->formatMenu($menus,$authMap,$mapping));
        if ($isCache)Cache::tags("AUTHORITY_MENU_MAPPING")->forever("am_mapping_".$userId,$result);
        return $result;
    }

    public function getVisibleMenuListAll()
    {
        $key = "am_mapping_all";
        if (Cache::tags("AUTHORITY_MENU_MAPPING")->has($key))
            return Cache::tags("AUTHORITY_MENU_MAPPING")->get($key);
        /** @var Collection $authorities */
        $authorities = app("AuthorityService")->getUserAuthorityData(true); //获取超管权限(全量)
        $authMap = app("AuthorityService")->format($authorities);
        $menus = $this->format($this->getMenu());//菜单权限(全量)
        $result = array_values($this->formatMenu($menus,$authMap));
        Cache::tags("AUTHORITY_MENU_MAPPING")->forever($key,$result);
        return $result;
    }

    /**
     * 格式化为树状结构
     *
     * @param Collection $menus
     * @return array
     */
    public function format(Collection $menus):array
    {
        $menuMap = [];
        foreach ($menus as $menu){
            $menuMap[$menu->id] = [
                "id" => $menu->id,
                "child" => [],
                "name"  => $menu->name,
                "font"  => $menu->font,
                "fontStyle"  => $menu->font_style,
                "route" => $menu->route,
            ];
        }
        foreach ($menus as $menu){
            if ($menu->parent_id){
                $menuMap[$menu->parent_id]["child"][] = $menuMap[$menu->id];
                unset($menuMap[$menu->id]);
            }
        }
        return $menuMap;
    }
    /**
     * 递归格式化菜单组
     *
     * @param array $menus
     * @param array $authorities
     * @param array $mapping
     *
     * @return array
     */
    private function formatMenu(array $menus,array $authorities,array &$mapping=[]):array
    {
        foreach ($menus as $index=>$menu){
            $mark = false;
            foreach ($authorities as $j=>$authority){
                if ($menu["name"] == $authority["name"]){
                    $mapping[$menu["id"]] = $authority["id"];
                    $menus[$index]["authId"] = $authority["id"];
                    $mark = true;
                    $authorities[$j]["mark"] = true;
                    if ($authority["child"])$menus[$index]["child"] = array_values($this->formatMenu($menu["child"],$authority["child"],$mapping));
                }
            }
            if (!$mark)unset($menus[$index]);
        }
        foreach ($authorities as $authority){
            if (!isset($authority["mark"])){
                $menus[] = [
                    "name" => $authority["name"],
                    "route" => "",
                ];
            }
        }
        return $menus;
    }

    /**
     * 获取菜单与权限映射
     */
    public function getMenuAndAuthorityMapping():array
    {
        $mapping = [];
        $this->getVisibleFunctionList(Authority::query()->get(),$mapping);
        return $mapping;
    }

    /**
     * 获取唯一名称
     */
    public function getUniqueName(Menu $menu)
    {
        if (!$menu->parent_id)return $menu->name;
        $menus = $this->getMenu();
        $menuMap = [];
        foreach ($menus as $m)$menuMap[$m->id] = $m;
        $names = [];
        while ($menu){
            $names[] = $menu->name;
            if ($menu->parent_id)$menu = $menuMap[$menu->parent_id] ?? null;
            else $menu = null;
        }
        $name = "";
        for ($i=count($names)-1;$i>=0;$i--){
            $name .= $names[$i];
            if ($i!=0)$name .= "-";
        }
        return $name;
    }
}