<?php

namespace app\common\logic;

use app\common\model\User;

class PermLogic
{
    /**
     * 获取用户所有资源（合并角色+直接分配）
     */
    public function getUserResources(int $userId)
    {
        $user = User::with(['roles.resources', 'resources'])->find($userId);
        if (!$user) {
            return collect();
        }

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

    /**
     * 构建目录/菜单树，节点包含权限与打开方式，拼接完整路径，并对子级菜单component处理
     * @param \Illuminate\Support\Collection $resources
     * @param int $parentId
     * @param string $parentPath
     * @return array
     */
    public function buildTree($resources, int $parentId = 0, string $parentPath = ''): array
    {
        $tree = [];
        foreach ($resources as $node) {
            if ($node->parent_id !== $parentId) continue;

            // 拼接完整路径
            $currentPath = $parentPath;
            if ($currentPath && substr($currentPath, -1) === '/') {
                $currentPath = rtrim($currentPath, '/');
            }
            if (!empty($node->url)) {
                if (!$currentPath) {
                    $currentPath = $node->url;
                } else {
                    $url = ltrim($node->url, '/');
                    $currentPath = $currentPath . '/' . $url;
                }
            }

            // 子节点递归
            $children = [];
            if ($node->type === 'directory') {
                $children = $this->buildTree($resources, $node->id, $currentPath);
            }

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

            // 判断是否有子级菜单（非权限）
            $hasChildrenMenu = collect($resources)->where('parent_id', $node->id)
                ->whereIn('type', ['directory', 'menu'])->isNotEmpty();

            // component 字段规则：
            // 1. 存在子菜单，固定 '/index/index'
            // 2. 否则为当前完整路径（或其它你想要的）
            $componentValue = $hasChildrenMenu ? '/index/index' : $currentPath;

            $tree[] = [
                'id'        => $node->id,
                'name'      => $node->name,
                'path'      => $node->url,
                'component' => $componentValue,
                'meta'      => [
                    'title'     => $node->name,
                    'icon'      => $node->icon,
                    'keepAlive' => true,
                    'authList'  => $authList,
                    'openType'  => $node->open_type,
                ],
                'children'  => $children,
            ];
        }
        return $tree;
    }

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