<?php
declare (strict_types=1);

namespace app\service;

use think\facade\Config;

class MenuService
{
    /**
     * 获取所有菜单配置
     */
    public static function getAllMenus(): array
    {
        return Config::get('menu.menus', []);
    }

    /**
     * 根据用户权限过滤菜单
     */
    public static function getMenusByPermission($userInfo): array
    {
        $allMenus = self::getAllMenus();
        return self::filterMenusByPermission($allMenus, $userInfo);
    }

    /**
     * 递归过滤菜单权限
     */
    private static function filterMenusByPermission($menus, $userInfo): array
    {
        $filteredMenus = [];
        
        foreach ($menus as $menu) {
            // 如果菜单指定了控制器，需要检查权限
            if (!empty($menu['controller'])) {
                if (!self::hasControllerPermission($userInfo, $menu['controller'])) {
                    continue;
                }
            }
            
            // 处理子菜单
            if (isset($menu['children']) && is_array($menu['children'])) {
                $children = self::filterMenusByPermission($menu['children'], $userInfo);
                // 如果有子菜单权限，才显示父菜单
                if (!empty($children)) {
                    $menu['children'] = $children;
                    $filteredMenus[] = $menu;
                }
            } else {
                // 没有子菜单的情况
                if (empty($menu['controller']) || self::hasControllerPermission($userInfo, $menu['controller'])) {
                    $filteredMenus[] = $menu;
                }
            }
        }
        
        return $filteredMenus;
    }

    /**
     * 检查用户是否有控制器权限
     */
    private static function hasControllerPermission($userInfo, $controller): bool
    {
        // 超级管理员拥有所有权限
        $superAdminRoleId = Config::get('permission.super_admin_role_id', 1);
        if ($userInfo['user_role'] == $superAdminRoleId) {
            return true;
        }

        // 获取用户角色权限
        $role = \app\model\UserRoleModel::getRoleById($userInfo['user_role'], $userInfo['merchant_id']);
        if (!$role) {
            return false;
        }

        $privileges = $role->privileges;
        
        // 检查是否有对应控制器的权限
        return isset($privileges[$controller]) && is_array($privileges[$controller]) && !empty($privileges[$controller]);
    }

    /**
     * 获取菜单树形结构（用于前端显示）
     */
    public static function getMenuTree($userInfo): array
    {
        $menus = self::getMenusByPermission($userInfo);
        return self::buildMenuTree($menus);
    }

    /**
     * 构建菜单树形结构
     */
    private static function buildMenuTree($menus): array
    {
        $tree = [];
        
        foreach ($menus as $menu) {
            $item = [
                'id' => $menu['id'],
                'title' => $menu['title'],
                'icon' => $menu['icon'] ?? '',
                'url' => $menu['url'] ?? '',
                'controller' => $menu['controller'] ?? '',
                'level' => $menu['level'],
                'sort' => $menu['sort'] ?? 0,
            ];
            
            if (isset($menu['children']) && is_array($menu['children'])) {
                $item['children'] = self::buildMenuTree($menu['children']);
                $item['spread'] = false; // 默认不展开
            }
            
            $tree[] = $item;
        }
        
        // 按sort字段排序
        usort($tree, function($a, $b) {
            return ($a['sort'] ?? 0) - ($b['sort'] ?? 0);
        });
        
        return $tree;
    }

    /**
     * 获取所有控制器权限配置
     */
    public static function getControllerPermissions(): array
    {
        return Config::get('menu.controller_permissions', []);
    }

    /**
     * 根据菜单ID获取菜单信息
     */
    public static function getMenuById($menuId): ?array
    {
        $allMenus = self::getAllMenus();
        return self::findMenuById($allMenus, $menuId);
    }

    /**
     * 递归查找菜单
     */
    private static function findMenuById($menus, $menuId): ?array
    {
        foreach ($menus as $menu) {
            if ($menu['id'] == $menuId) {
                return $menu;
            }
            
            if (isset($menu['children']) && is_array($menu['children'])) {
                $found = self::findMenuById($menu['children'], $menuId);
                if ($found) {
                    return $found;
                }
            }
        }
        
        return null;
    }

    /**
     * 获取面包屑导航
     */
    public static function getBreadcrumb($menuId): array
    {
        $breadcrumb = [];
        $allMenus = self::getAllMenus();
        
        $path = self::getMenuPath($allMenus, $menuId);
        
        foreach ($path as $menu) {
            $breadcrumb[] = [
                'id' => $menu['id'],
                'title' => $menu['title'],
                'url' => $menu['url'] ?? ''
            ];
        }
        
        return $breadcrumb;
    }

    /**
     * 获取菜单路径
     */
    private static function getMenuPath($menus, $menuId, $path = []): array
    {
        foreach ($menus as $menu) {
            $currentPath = array_merge($path, [$menu]);
            
            if ($menu['id'] == $menuId) {
                return $currentPath;
            }
            
            if (isset($menu['children']) && is_array($menu['children'])) {
                $found = self::getMenuPath($menu['children'], $menuId, $currentPath);
                if (!empty($found)) {
                    return $found;
                }
            }
        }
        
        return [];
    }
}