<?php

namespace app\common\logic;

use app\common\model\User;
use app\common\model\Resource;
use app\common\model\Systems;

class PermLogic
{
    /**
     * 获取用户所有资源（合并角色+直接分配），并加入公共菜单，排序按sort字段
     */
    public function getUserResources(int $userId, string $systemCode)
    {
        $system = Systems::where('code', $systemCode)->first();

        // 获取用户及其关联角色资源和直接分配的资源
        $user = User::with(['roles.resources', 'resources'])->find($userId);

        if (!$user) {
            return collect();
        }

        $all = collect();

        // 合并角色资源，排除不需要权限认证的资源
        foreach ($user->roles as $role) {
            $all = $all->merge(
                $role->resources->filter(function ($resource) use($system) {
                    // var_dump($resource->toArray());
                    // 只保留需要权限认证的资源（或公共资源）
                    return !$resource->no_auth && ($system->id == $resource->system_id || $resource->system_id == 0);
                })
            );
        }

        // 合并用户直接分配的资源，排除不需要权限认证的资源
        $all = $all->merge(
            $user->resources->filter(function ($resource) {
                // 只保留需要权限认证的资源（或公共资源）
                return !$resource->no_auth;
            })
        );

        // 加入公共菜单，公共菜单不管是否授权，所有人都能访问
        $publicResources = Resource::where('no_auth', 1)
            ->orderBy('sort', 'asc') // 按 sort 字段升序排序
            ->get();

        // 合并所有公共资源
        $all = $all->merge($publicResources);

        // 返回唯一的资源列表，并按 id 排序
        // 使用 sortBy('sort') 来确保最终结果根据 'sort' 字段排序
        return $all->unique('id')->values()->sortBy('sort');
    }

    /**
     * 构建目录/菜单树
     *
     * @param \Illuminate\Support\Collection $resources  全部资源集合
     * @param int                             $parentId   当前父级资源 ID
     * @param string                          $parentPath 父级完整路径（用于递归）
     * @return array
     */
    public function buildTree_bak($resources, int $parentId = 0, string $parentPath = ''): array
    {
        $tree = [];

        foreach ($resources as $node) {
            // 只处理目录和菜单，不把 permission 当作菜单节点
            if ($node->parent_id !== $parentId || $node->type === 'permission') {
                continue;
            }

            // —— 拼接当前节点的完整路径 —— 
            $currentPath = rtrim($parentPath, '/');
            if (!empty($node->url)) {
                $urlSegment  = ltrim($node->url, '/');
                $currentPath = $currentPath === ''
                    ? $urlSegment
                    : "{$currentPath}/{$urlSegment}";
            }

            // —— 递归构建子节点 —— 
            // 这里只会继续收目录和菜单，permission 永远不会进入此方法
            $children = $this->buildTree($resources, $node->id, $currentPath);

            // —— 本级权限列表 —— 
            $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();

            // —— 判断是否有子目录或子菜单 —— 
            $hasChildrenMenu = ! empty($children);

            // —— 计算 component 字段 —— 
            if ($hasChildrenMenu) {
                if ($node->type === 'menu' && !empty($node->url)) {
                    // menu 类型且自身有 url，用自身 url（加前导 slash）
                    $componentValue = '/' . ltrim($node->url, '/');
                } else {
                    // 其它含子项的节点，固定 Layout 组件
                    $componentValue = '/index/index';
                }
            } else {
                // 叶子节点：拼接路径，确保以 slash 开头
                $componentValue = $currentPath !== ''
                    ? '/' . ltrim($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,
                    'isHide'    => $node->is_hide == 0 ? false : true,
                    'isHideTab' => $node->is_hide_tab == 0 ? false : true
                ],
                'children'  => $children
            ];
        }

        return $tree;
    }
    public function buildTree_bak2($resources, int $parentId = 0, string $parentPath = ''): array
    {
        $tree = [];

        foreach ($resources as $node) {
            if ($node->parent_id !== $parentId) {
                continue;
            }

            // —— 拼接当前节点的完整路径 —— 
            $currentPath = $parentPath;
            // 去掉末尾多余 slash
            $currentPath = rtrim($currentPath, '/');

            if (!empty($node->url)) {
                // 如果当前节点有 url，则拼接
                $urlSegment   = ltrim($node->url, '/');
                $currentPath  = $currentPath === '' 
                    ? $urlSegment 
                    : "{$currentPath}/{$urlSegment}";
            }

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

            // —— 收集本级的 permission 权限列表 —— 
            $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();

            // —— 判断是否有子菜单/目录 —— 
            $hasChildrenMenu = $resources
                ->where('parent_id', $node->id)
                ->whereIn('type', ['directory', 'menu'])
                ->isNotEmpty();

            // —— 计算 component 字段 —— 
            if ($hasChildrenMenu) {
                // 只要有子项，就一律显示顶层 Layout 组件
                $componentValue = '/index/index';
            } else {
                // 叶子节点：如果定义了 url，就使用拼接后的路径；否则用占位符（这里用空串，你可替换）
                $componentValue = $currentPath !== '' ? $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 $tree;
    }
    public function buildTree($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();

            $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,
                    'isHide'    => $node->is_hide == 0 ? false : true,
                    'isHideTab' => $node->is_hide_tab == 0 ? false : true
                ],
                'children'  => $children,
            ];
        }
        return $tree;
    }

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