<?php

namespace app\common\service;

use app\model\User;
use app\model\Role;
use app\model\Resource;

class ResourceService
{
    /**
     * 获取用户可见菜单树
     */
    public static function getMenuTreeForUser($userId)
    {
        $menuList = self::getUserMenus($userId);
        // 转树
        return self::buildTree($menuList);
    }

    /**
     * 获取用户所有有权限的菜单资源（type=menu）
     */
    public static function getUserMenus($userId)
    {
        $user = User::with('roles.resources')->find($userId);
        if (!$user) return [];
        // 合并所有角色下的菜单资源
        $allMenus = [];
        foreach ($user->roles as $role) {
            foreach ($role->resources as $res) {
                if ($res->type === 'menu') {
                    $allMenus[$res->id] = $res;
                }
            }
        }
        return array_values($allMenus); // 去重后返回
    }

    /**
     * 获取用户所有有权限的按钮/功能权限 code
     */
    public static function getButtonPermissionCodesForUser($userId)
    {
        $user = User::with('roles.resources')->find($userId);
        if (!$user) return [];
        $codes = [];
        foreach ($user->roles as $role) {
            foreach ($role->resources as $res) {
                if ($res->type === 'button' && $res->code) {
                    $codes[$res->code] = true;
                }
            }
        }
        return array_keys($codes); // 去重后返回权限code数组
    }

    /**
     * 递归构建菜单树
     * @param Resource[] $list
     * @param int $parentId
     * @return array
     */
    protected static function buildTree($list, $parentId = 0)
    {
        $tree = [];
        foreach ($list as $item) {
            if ($item->parent_id == $parentId) {
                $children = self::buildTree($list, $item->id);
                $arr = [
                    'id'    => $item->id,
                    'name'  => $item->name,
                    'path'  => $item->url,
                    'icon'  => $item->icon ?? null,
                    'code'  => $item->code,
                    'children' => $children,
                ];
                $tree[] = $arr;
            }
        }
        return $tree;
    }
}