<?php

namespace App\Services\Admin;

use App\Exceptions\AdminMenuItemArgInvalidException;
use  App\Http\Controllers\Admin\Menu\BaseMenuItemController;
use Composer\Util\Git;
use Validator;
use Arr;
use Route;

/**
 * 存放Admin主選單項目
 *
 * Class MainMenuItemHandler
 * @package App\Handlers\Admin
 */
class MainMenuItemService
{
    private $menu = [];

    private $allowedItemTypes = [
        'item',
        'title',
        'divider'
    ];

    private $adminRouteNamePrefix;

    public function __construct()
    {
        $this->adminRouteNamePrefix = config('admin.route_name_prefix');
    }

    /**
     * 驗證新增選單項目方法參數
     *
     * @param $args
     * @throws AdminMenuItemArgInvalidException
     */
    private function validateItemArgs($args)
    {
        $validator = Validator::make($args, [
            'type' => 'required',
            'name' => 'required_if:type,title',
            'slug' => 'required_if:type,item',
            'controller' => 'required_if:type,item',
            'routeName' => 'required_if:type,item',
        ]);
        if($validator->fails()) {
            throw new AdminMenuItemArgInvalidException($validator->getMessageBag()->first());
        }
    }

    /**
     * 新增選單項目
     *
     * @param array $givenArgs
     * @param BaseMenuItemController $menuItemController;
     * @throws AdminMenuItemArgInvalidException
     */
    public function addItem($givenArgs, BaseMenuItemController $menuItemController = null)
    {

        $args = [
            'slug'       => null,
            'routeName'  => null,
            'link'       => null,
            'iconClass'  => null,
            'badge'      => null,
            'controller' => null,
            'parentSlug' => null,
        ];

        if($givenArgs['type'] == 'item' && $menuItemController) {
            $givenArgs['slug']       = $menuItemController->getSlug();
            $givenArgs['iconClass']  = $menuItemController->getIconClass();
            $givenArgs['badge']      = $menuItemController->getBadge();
            $givenArgs['controller'] = $menuItemController;
        }

        $this->validateItemArgs($givenArgs);

        foreach ($givenArgs as $key => $value) {
            $args = Arr::add($args, $key, $value);
        }

        if(in_array($args['type'], $this->allowedItemTypes)) {
            if($args['parentSlug']) {
                Arr::set($this->menu, "{$args['parentSlug']}.children.{$args['slug']}", $args);
            } else {
                if($args['type'] == 'item') {
                    $this->menu[$args['slug']] = $args;
                } else {
                    $this->menu[] = $args;
                }
            }
        }
    }

    /**
     * 取得選單項目
     *
     * @return array
     */
    public function getMenu()
    {
        foreach ($this->menu as $parentSlug => $parentItem) {
            if($parentItem['controller']) {
                $userHasParentPermission = $parentItem['controller']->userHasPermission();
                Arr::set($this->menu, "$parentSlug.userHasPermission", $userHasParentPermission);

                Arr::set($this->menu, "$parentSlug.name", $parentItem['controller']->getName());

                $parentRouteName = $this->adminRouteNamePrefix . $parentItem['routeName'];
                $link = Route::has($parentRouteName) ? route($parentRouteName) : '#';
                Arr::set($this->menu, "$parentSlug.link", $link);

                if(!empty($parentItem['children'])) {
                    foreach ($parentItem['children'] as $childSlug => $childItem) {
                        if($childItem['controller']) {
                            Arr::set($this->menu,
                                "$parentSlug.children.$childSlug.userHasPermission",
                                $userHasParentPermission && $childItem['controller']->userHasPermission());

                            Arr::set($this->menu, "$parentSlug.children.$childSlug.name", $childItem['controller']->getName());

                            $childRouteName = $this->adminRouteNamePrefix . $childItem['routeName'];
                            $link = Route::has($childRouteName) ? route($childRouteName) : '#';
                            Arr::set($this->menu, "$parentSlug.children.$childSlug.link", $link);
                        }
                    }
                }
            }
        }
        return $this->menu;
    }

    /**
     * 設定選單項目
     *
     * @param $menu
     */
    public function setMenu($menu)
    {
        $this->menu = $menu;
    }

}