<?php
declare(strict_types=1);

namespace MailAccountAdmin\Frontend\Accounts;

use MailAccountAdmin\Exceptions\InputValidationError;

class AccountEditData
{
    /** @var null|string */
    private $username;
    /** @var bool */
    private $usernameCreateAlias;
    /** @var bool */
    private $usernameReplaceAlias;
    /** @var null|string */
    private $password;
    /** @var bool */
    private $active;
    /** @var null|string */
    private $homeDir;
    /** @var null|string */
    private $memo;

    private function __construct(?string $username, bool $usernameCreateAlias, bool $usernameReplaceAlias, ?string $password, bool $active,
                                 ?string $homeDir, ?string $memo)
    {
        $this->username = $username;
        $this->usernameCreateAlias = $usernameCreateAlias;
        $this->usernameReplaceAlias = $usernameReplaceAlias;
        $this->password = $password;
        $this->active = $active;
        $this->homeDir = $homeDir;
        $this->memo = $memo;
    }

    public static function createFromArray($raw): self
    {
        return new self(
            self::validateUsername(trim($raw['username'] ?? '')),
            self::validateBoolOption(trim($raw['username_create_alias'] ?? '')),
            self::validateBoolOption(trim($raw['username_replace_alias'] ?? '')),
            self::validatePassword(trim($raw['password'] ?? ''), trim($raw['password_repeat'] ?? '')),
            self::validateBoolOption(trim($raw['is_active'] ?? '')),
            self::validateHomeDir(trim($raw['home_dir'] ?? '')),
            trim($raw['memo'] ?? '')
        );
    }


    // Input validation

    private static function validateUsername(string $username): ?string
    {
        if ($username === '') {
            return null;
        }
        if (strlen($username) > 100) {
            throw new InputValidationError('Username is too long.');
        }

        $username = strtolower($username);
        if (!preg_match('/^[a-z0-9._+-]+@[a-z0-9.-]+$/', $username) || preg_match('/^\\.|\\.\\.|\\.@|@\\.|\\.$/', $username)) {
            throw new InputValidationError('Username is not valid (must be a valid mail address).');
        }
        return $username;
    }

    private static function validatePassword(string $password, string $passwordRepeat): ?string
    {
        if ($password === '') {
            return null;
        }
        if ($password !== $passwordRepeat) {
            throw new InputValidationError('Passwords do not match.');
        }
        return $password;
    }

    private static function validateHomeDir(string $homeDir): ?string
    {
        if ($homeDir === '') {
            return null;
        }
        if (strlen($homeDir) > 100) {
            throw new InputValidationError('Home directory is too long.');
        }

        $homeDir = trim($homeDir, '/');
        if (!preg_match('!^[a-z0-9._+-]+(/[a-z0-9._+-]+)*$!i', $homeDir)) {
            throw new InputValidationError('Home directory is not a valid path.');
        }
        return $homeDir;
    }

    private static function validateBoolOption(string $raw): bool
    {
        return $raw !== '';
    }


    // Getters

    public function getUsername(): ?string
    {
        return $this->username;
    }

    public function getUsernameCreateAlias(): bool
    {
        return $this->usernameCreateAlias;
    }

    public function getUsernameReplaceAlias(): bool
    {
        return $this->usernameReplaceAlias;
    }

    public function getPassword(): ?string
    {
        return $this->password;
    }

    public function getActive(): bool
    {
        return $this->active;
    }

    public function getHomeDir(): ?string
    {
        return $this->homeDir;
    }

    public function getMemo(): string
    {
        return $this->memo;
    }
}