<?php
namespace App\Models\Content\ModelTraits;

use App\CMS\Handlers\Contracts\HistoryHandler;
use App\CMS\Helpers\Differ;
use App\Models\Content\Content as ContentModel;

trait ContentHistory
{
    /**
     * Returns history grouped by revisions (edit_batches)
     *
     * @param ContentModel $content
     *
     * @return array
     */
    public function getStructuredHistoryOf(ContentModel $content)
    {
        $data = $content->history()
                        ->select('content_history.*', 'contents.moduleHandler', 'users.email AS user_email', 'users.name AS user_name')
                        ->join('users', 'users.id', '=', 'content_history.user_id')
                        ->join('contents', 'contents.id', '=', 'content_history.content_id')
                        ->orderBy('changed_at', 'DESC')
                        ->get();

        $info = [];
        $history = [];
        foreach ($data as $change) {
            $info[$change->edit_batch] = [
                'changed_at' => $change->changed_at,
                'user'       => [
                    'id'    => $change->user_id,
                    'name'  => $change->user_name,
                    'email' => $change->user_email
                ]
            ];

            $change = $this->handleChangeset($change);

            $history[$change->edit_batch][] = $change;
        }

        return [
            'changesets' => $history,
            'info'       => $info
        ];
    }

    /**
     * Getter for history handler of given module
     *
     * @param $change
     *
     * @return HistoryHandler
     */
    protected function getHistoryHandler($change)
    {
        /**
         * @var $handler        AppHandler
         */

        // get handler of given content page
        $handler = $change->moduleHandler;

        return $handler::getHistoryHandler();
    }

    public function handleChangeset($change)
    {
        $historyHandler = $this->getHistoryHandler($change);

        $change->column_trans = $historyHandler::parseColumnName($change->column);
        $change->diff = $historyHandler::parseChangedValue($change);

        return $change;
    }

    public function getDiff($change)
    {
        return Differ::htmlDiff(nl2br(e($change->old_value)), nl2br(e($change->new_value)));
    }
}