<?php

namespace app\common\service;

use app\common\model\User;
use support\Cache;

class PermService
{

    // 用户资源缓存key
    protected static function cacheKey(int $userId): string
    {
        return "user_resources_{$userId}";
    }

    /**
     * 获取用户所有资源（合并角色+直接分配），结果缓存
     */
    public static function getUserResources(int $userId)
    {
        $cacheKey = self::cacheKey($userId);
        $cached   = Cache::get($cacheKey);
        if ($cached !== null) {
            return $cached;
        }

        $user = User::with(['roles.resources', 'resources'])->find($userId);
        if (!$user) {
            return collect();
        }

        $all = collect();
        foreach ($user->roles as $role) {
            $all = $all->merge($role->resources);
        }
        $all = $all->merge($user->resources);
        $unique = $all->unique('id')->values();

        Cache::set($cacheKey, $unique, 3600);
        return $unique;
    }

    /**
     * 构建目录/菜单树，节点包含权限与打开方式
     */
    public static function getMenuTree(int $userId): array
    {
        $resources = self::getUserResources($userId);
        $menus = $resources
            ->filter(fn($r) => in_array($r->type, ['directory','menu']))
            ->values();
        return self::buildTree($menus, $resources);
    }

    protected static function buildTree($nodes, $allResources, int $parentId = 0): array
    {
        $tree = [];
        foreach ($nodes as $node) {
            if ($node->parent_id !== $parentId) continue;

            $children = self::buildTree($nodes, $allResources, $node->id);

            $authList = $allResources
                ->filter(fn($r) => $r->type === 'permission' && $r->parent_id === $node->id)
                ->map(fn($r) => [
                    'id'        => $r->id,
                    'title'     => $r->name,
                    'auth_mark' => $r->code,
                ])->values()->all();

            $tree[] = [
                'id'       => $node->id,
                'name'     => $node->name,
                'path'     => $node->url,
                'meta'     => [
                    'title'     => $node->name,
                    'icon'      => $node->icon,
                    'keepAlive' => true,
                    'authList'  => $authList,
                    'openType'  => $node->open_type, // 'internal' | 'external' | 'iframe'
                ],
                'children' => $children,
            ];
        }
        return $tree;
    }

    /**
     * 获取用户所有权限code
     */
    public static function getPermissionCodes(int $userId): array
    {
        return self::getUserResources($userId)
            ->filter(fn($res) => $res->type === 'permission')
            ->pluck('code')
            ->unique()
            ->values()
            ->all();
    }

    /**
     * 清除资源相关缓存
     */
    public static function clearCache(int $userId): void
    {
        Cache::delete(self::cacheKey($userId));
    }
}