<?php namespace MapGuesser\Repository;

use Generator;
use MapGuesser\Database\Query\Select;
use MapGuesser\PersistentData\Model\Challenge;
use MapGuesser\PersistentData\Model\Place;
use MapGuesser\PersistentData\Model\User;
use MapGuesser\PersistentData\PersistentDataManager;

class ChallengeRepository
{
    private PersistentDataManager $pdm;

    public function __construct()
    {
        $this->pdm = new PersistentDataManager();
    }

    public function getById(int $challengeId): ?Challenge
    {
        return $this->pdm->selectFromDbById($challengeId, Challenge::class);
    }

    public function getByToken(int $token): ?Challenge
    {
        $select = new Select(\Container::$dbConnection);
        $select->where('token', '=', $token);
        
        return $this->pdm->selectFromDb($select, Challenge::class);
    }

    public function getByTokenStr(string $token_str): ?Challenge
    {
        // validate token string
        foreach (str_split($token_str) as $char) {
            if (!(('0' <= $char && $char <= '9') || ('a' <= $char && $char <= 'f'))) {
                return null;
            }
        }
        // convert token to int
        $token = hexdec($token_str);

        return $this->getByToken($token);
    }

    public function getAllByParticipant(User $user): Generator
    {
        $select = new Select(\Container::$dbConnection);
        $select->innerJoin('user_in_challenge', ['challenge', 'id'], '=', ['user_in_challenge', 'challenge_id']);
        $select->innerJoin('users', ['users', 'id'], '=', ['user_in_challenge', 'user_id']);
        $select->where('user_id', '=', $user->getId());

        yield from $this->pdm->selectMultipleFromDb($select, Challenge::class);
    }

    public function getAllByOwner(User $user): Generator
    {
        $select = new Select(\Container::$dbConnection);
        $select->innerJoin('user_in_challenge', ['challenge', 'id'], '=', ['user_in_challenge', 'challenge_id']);
        $select->innerJoin('users', ['users', 'id'], '=', ['user_in_challenge', 'user_id']);
        $select->where('user_id', '=', $user->getId());
        $select->where('is_owner', '=', true);

        yield from $this->pdm->selectMultipleFromDb($select, Challenge::class);
    }

    public function getAllByPlace(Place $place): Generator
    {
        $select = new Select(\Container::$dbConnection);
        $select->innerJoin('place_in_challenge', ['challenges', 'id'], '=', ['place_in_challenge', 'challenge_id']);
        $select->where('place_id', '=', $place->getId());

        yield from $this->pdm->selectMultipleFromDb($select, Challenge::class);
    }
}