<?php

declare(strict_types=1);

namespace App\Service;

use App\Entity\Actor;
use App\Entity\Game;
use App\Entity\GameRow;
use App\Entity\User;
use App\Repository\ActorRepository;
use Doctrine\ORM\EntityManagerInterface;

class GameGridGenerator
{
    public function __construct(
        private readonly ActorRepository $actorRepository,
        private readonly EntityManagerInterface $em,
    ) {}

    public function generate(?User $user = null): Game
    {
        $mainActor = $this->actorRepository->findOneRandom(4);

        $game = new Game();
        $game->setMainActor($mainActor);
        $game->setUser($user);

        $usedActors = [$mainActor->getId()];
        $rowOrder = 0;

        foreach (str_split(strtolower($mainActor->getName())) as $char) {
            if (!preg_match('/[a-z]/', $char)) {
                continue;
            }

            $tryFindActor = 0;
            do {
                $actor = $this->actorRepository->findOneRandom(4, $char);
                ++$tryFindActor;
            } while (
                in_array($actor->getId(), $usedActors)
                || $tryFindActor < 5
            );

            $usedActors[] = $actor->getId();

            $row = new GameRow();
            $row->setActor($actor);
            $row->setPosition(strpos(strtolower($actor->getName()), $char));
            $row->setRowOrder($rowOrder);

            $game->addRow($row);
            ++$rowOrder;
        }

        $this->em->persist($game);
        $this->em->flush();

        return $game;
    }

    /**
     * Compute display data (grid, width, middle) from a Game entity for the React component.
     *
     * @return array{grid: list<array{actorName: string, actorId: int, pos: int}>, width: int, middle: int}
     */
    public function computeGridData(Game $game): array
    {
        $leftSize = 0;
        $rightSize = 0;
        $grid = [];

        foreach ($game->getRows() as $row) {
            $actor = $row->getActor();
            $pos = $row->getPosition();

            if ($leftSize < $pos) {
                $leftSize = $pos;
            }

            $rightSizeActor = strlen($actor->getName()) - $pos - 1;
            if ($rightSize < $rightSizeActor) {
                $rightSize = $rightSizeActor;
            }

            $grid[] = [
                'actorName' => $actor->getName(),
                'actorId' => $actor->getId(),
                'pos' => $pos,
            ];
        }

        return [
            'grid' => $grid,
            'width' => $rightSize + $leftSize + 1,
            'middle' => $leftSize,
        ];
    }
}