<?php

namespace App\Traits\Controllers;

use App\Http\Requests\Bo\ChangeOrderRequest;
use App\Traits\Models\IsCachedAsCollection;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\RedirectResponse;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Session;
use Illuminate\Validation\ValidationException;

trait ChangesModelOrder
{
    /**
     * Change order
     *
     * ! requires x64 server + order column as unique integer
     *
     * @param \App\Http\Requests\Bo\ChangeOrderRequest $request
     * @param \Illuminate\Database\Eloquent\Model      $model
     * @return \Illuminate\Http\RedirectResponse
     * @throws \RuntimeException Si le nom du parametre de la route ne correspond pas au model utilisé.
     */
    public function changeOrder(ChangeOrderRequest $request, Model $model): RedirectResponse
    {
        return DB::transaction(function () use ($request, $model) {
            /** @var \Illuminate\Database\Eloquent\Model|null */
            $tmp = (\get_class($model))::where('order', $request->direction ? '<' : '>', $model->order)
                ->orderBy('order', $request->direction ? 'DESC' : 'ASC')->first();
            if (!$tmp) {
                return back()->with('bo.error', trans('L\'ordre n\'a pas pu être modifié'));
            }
            $oldOrder = $model->order;
            $newOrder = $tmp->order;

            // * Silent update timestamps.
            $tmp->timestamps   = false;
            $model->timestamps = false;

            $saveOk = false;

            // ! Fake value to prevent unique SQL key to trigger.
            $tmp->order   = 4294967295;
            $saveOk       = $tmp->saveQuietly();
            $model->order = $newOrder;
            $saveOk       = $model->saveQuietly() & $saveOk;
            $tmp->order   = $oldOrder;
            $saveOk       = $tmp->saveQuietly() & $saveOk;
            if (\in_array(IsCachedAsCollection::class, class_uses_recursive(\get_class($model)))) {
                $model::removeCached();
            }
            if (!$saveOk) {
                throw ValidationException::withMessages([
                    'error' => \trans('L\'ordre n\'a pas pu être modifié')
                ]);
            }
            Session::flash('bo.success', trans('L\'ordre a été modifié'));
            return back();
        });
    }
}