<?php

namespace App\Security\Hasher;

use App\SQLLogin\Exception\InvalidSQLLoginAlgoException;
use App\SQLLogin\Exception\InvalidSQLLoginConfigurationException;
use App\SQLLogin\Exception\InvalidSQLPasswordException;
use Symfony\Component\PasswordHasher\Exception\InvalidPasswordException;
use Symfony\Component\PasswordHasher\Hasher\CheckPasswordLengthTrait;
use Symfony\Component\PasswordHasher\LegacyPasswordHasherInterface;

class PasswordEncoder implements LegacyPasswordHasherInterface
{
    use CheckPasswordLengthTrait;
    public const PASSWORD_PATTERN = 'password';
    public const SALT_PATTERN = 'salt';
    public const PEPPER_PATTERN = 'pepper';

    protected ?string $pepper;
    protected array $hashAlgoLegacy;
    protected ?string $newHashAlgo;
    protected array $securityPattern;

    public function __construct(?string $pepper, string $hashAlgoLegacy, ?string $newHashAlgo, string $securityPattern)
    {
        $this->pepper = $pepper;
        $this->hashAlgoLegacy = explode(',', $hashAlgoLegacy);
        $this->newHashAlgo = $newHashAlgo;
        $this->securityPattern = explode(',', $securityPattern);
    }

    /**
     * Utilise l'algo legacy
     */
    public function hash(string $plainPassword, string $salt = null): string
    {
        if ($this->isPasswordTooLong($plainPassword)) {
            throw new InvalidPasswordException();
        }
        $completedPlainPassword = $this->getPasswordToHash($plainPassword, $salt);
        if ($this->isObsoleteAlgo($this->newHashAlgo)) {
            throw new InvalidSQLLoginAlgoException();
        }

        return password_hash($completedPlainPassword, $this->getValidALgo($this->newHashAlgo));
    }

    public function verify(string $hashedPassword, string $plainPassword, string $salt = null): bool
    {
        if ('' === $plainPassword || $this->isPasswordTooLong($plainPassword)) {
            return false;
        }

        $isNewest = password_get_info($hashedPassword)['algo'] === $this->newHashAlgo;

        $completedPassword = $this->getPasswordToHash($plainPassword, $salt);
        if ($isNewest) {
            if (password_verify($completedPassword, $hashedPassword)) {
                return true;
            } else {
                throw new InvalidSQLPasswordException();
            }
        }

        // Si le mot de passe a besoin d'un rehash ou qu'il n'y a pas de nouvelle méthode indiquée, on sait qu'il faut utiliser l'une des méthodes legacy pour vérifier le mot de passe
        if ($this->needsRehash($hashedPassword) || empty($this->newHashAlgo)) {
            foreach ($this->hashAlgoLegacy as $algo) {
                if ($this->isObsoleteAlgo($algo)) {
                    if (hash_equals(hash($algo, $completedPassword), $hashedPassword)) {
                        return true;
                    }
                } else {
                    if (password_verify($completedPassword, $hashedPassword)) {
                        return true;
                    }
                }
                // On vérifie si la méthode legacy est obsolète, si oui on ne peut pas utiliser password_verify, on doit hasher et comparer
            }
            // si on on n'a pas encore retourné de résultat, le mot de passe doit être incorrect
            throw new InvalidSQLPasswordException();
        }
        // Si on n'est pas rentré dans les conditions précedéntes, on peut utiliser password_verify
        if (password_verify($completedPassword, $hashedPassword)) {
            return true;
        } else {
            throw new InvalidSQLPasswordException();
        }
    }

    public function needsRehash(string $hashedPassword): bool
    {
        // Il y a besoin de tester si on veut mettre à jour le hashage de mot de passe uniquement si le nouveau algo de hashage est indiqué et qu'il est moderne (BCRYPT, ARGON, ...)
        if (!empty($this->newHashAlgo) && !$this->isObsoleteAlgo($this->newHashAlgo)) {
            return password_needs_rehash($hashedPassword, $this->getValidAlgo($this->newHashAlgo));
        }

        return false;
    }

    /**
     * @param mixed $algo
     *
     * @return string
     */
    public function getValidAlgo($algo)
    {
        if ($algo) {
            if (in_array($algo, hash_algos())) {
                return $algo;
            }
            $informalAlgos = [
                'default' => PASSWORD_DEFAULT,
                'bcrypt' => PASSWORD_BCRYPT,
                'argon2i' => PASSWORD_ARGON2I,
                'argon2id' => PASSWORD_ARGON2ID,
            ];
            if (in_array($algo, array_keys($informalAlgos))) {
                return $informalAlgos[$algo];
            }
            if (in_array($algo, password_algos())) {
                return $algo;
            }

            throw new InvalidSQLLoginAlgoException('Invalid Algorythme');
        }
    }

    public function isObsoleteAlgo($algo): bool
    {
        return in_array($algo, hash_algos());
    }

    /**
     * Retourne la string à hasher en fonction du pattern indiqué
     *
     * @param mixed $plainTextPassword
     * @param mixed $salt
     *
     * @return string
     */
    protected function getPasswordToHash($plainTextPassword, $salt)
    {
        $arrayRef = [
            self::PASSWORD_PATTERN => $plainTextPassword,
            self::SALT_PATTERN => $salt,
            self::PEPPER_PATTERN => $this->pepper,
        ];

        foreach ($this->securityPattern as $term) {
            if (self::PEPPER_PATTERN !== $term && self::PASSWORD_PATTERN !== $term && self::SALT_PATTERN !== $term) {
                throw new InvalidSQLLoginConfigurationException();
            }
        }
        $completedPlainPassword = '';
        foreach ($this->securityPattern as $term) {
            $completedPlainPassword .= $arrayRef[$term];
        }

        return $completedPlainPassword;
    }
}