<?php
namespace App\CMS\Observers;

use App\Events\CreateNewContent;
use App\Models\Content\Content as ContentModel;
use App\Models\Content\ContentHistory;
use Illuminate\Support\Facades\Event;

class Content
{
    protected $changeset;

    public function __construct()
    {
        $this->changeset = uniqid();
    }

    /**
     * @param ContentModel $content
     */
    public function created(ContentModel $content)
    {
        Event::fire(new CreateNewContent($content));
    }

    /**
     * Get all dirty changed from model.
     *
     * If user did not change moduleSettings column, return result from ContentModel::getDirty(). Otherwise append all
     * changed columns from module settings.
     *
     * @param $changed
     * @param $original
     *
     * @return array
     */
    protected function getDirtyFields($changed, $original)
    {
        unset($changed['updated_at']);

        $changes = $this->getNewAndOldValues(array_keys($changed), $changed, $original);

        if (!isset($changed['moduleSettings']))
            return $changes;

        $moduleSettings = (array)json_decode($changed['moduleSettings']);
        $originalSettings = (array)json_decode($original['moduleSettings']);
        unset($changed['moduleSettings']);

        $settingChanged = array_keys(array_diff_assoc($moduleSettings, $originalSettings));
        $changesInSettings = $this->getNewAndOldValues($settingChanged, $moduleSettings, $originalSettings);

        return array_merge($changes, $changesInSettings);
    }

    /**
     *
     *
     * @param $fields
     * @param $new
     * @param $original
     *
     * @return array
     */
    protected function getNewAndOldValues($fields, $new, $original) {
        $changes = [];
        foreach ($fields as $field) {
            $changes[$field] = [
                'new' => isset($new[$field]) ? $new[$field] : null,
                'old' => isset($original[$field])? $original[$field] : null
            ];
        }

        return $changes;
    }

    public function updated(ContentModel $content)
    {
        $fields = $this->getDirtyFields($content->getDirty(), $content->getOriginal());

        foreach ($fields as $field => $change) {
            $history = [
                'user_id'    => \Auth::user()->id,
                'content_id' => $content->id,
                'edit_batch' => $this->changeset,
                'column'     => $field,
                'old_value'  => $change['old'],
                'new_value'  => $change['new']
            ];

            // save history
            ContentHistory::create($history);
        }
    }

    /**
     * @param ContentModel $content
     */
    public function deleted(ContentModel $content)
    {
    }
}