<?php

namespace app\controllers;

use app\models\Link;
use app\models\Tag;
use Yii;
use yii\data\Pagination;
use yii\helpers\Url;
use yii\web\Controller;

class LinkController extends Controller
{
    public function actionCreateEdit($id)
    {
        $request = Yii::$app->request;

        $link = Link::find()
            ->where(['id' => $id])
            ->with('tags')
            ->one();

        $allTags = Tag::find()->all();

        if ($link->load($request->post()) && $link->validate()) {
            $givenTags = $request->getBodyParam('tags');

            $newTagNames = array_diff($givenTags, $allTags);
            foreach ($newTagNames as $tagName) {
                $tag = (new Tag)->setName($tagName);
                $tag->save();
                $link->link('tags', $tag);
            }

            foreach (array_diff($allTags, $link->tags) as $existedTag) {
                $link->link('tags', $existedTag);
            }

            $tagsToDelete = array_diff($link->tags, $givenTags);
            foreach ($tagsToDelete as $tag) {
                $link->unlink('tags', $tag, $delete = true);
            }

            $link->save($runValidation = false);

            return $this->redirect(Url::to(['link/create-edit', 'id' => $link->id]));
        }

        return $this->render('create_edit', compact('link', 'allTags'));
    }
}