<?php
declare(strict_types=1);

final class DirectAdminUser
{
    private string $username;
    private string $skin;
    private string $language;
    private string $configDir;

    public function __construct(string $username, string $skin = 'enhanced', string $language = 'en', string $configDir = Settings::CONFIG_DIR)
    {
        if (!preg_match('/^[A-Za-z0-9._-]+$/', $username)) {
            throw new InvalidArgumentException('Invalid username');
        }
        $this->username = $username;
        $this->skin = $skin !== '' ? $skin : 'enhanced';
        $this->language = $language !== '' ? strtolower($language) : 'en';
        $this->configDir = $configDir;
    }

    public static function fromEnvironment(Settings $settings): self
    {
        $username = getenv('USERNAME') ?: getenv('USER') ?: getenv('DA_USER') ?: '';
        if ($username === '' && isset($_SERVER['USERNAME'])) {
            $username = (string)$_SERVER['USERNAME'];
        }
        if ($username === '') {
            throw new RuntimeException('Cannot determine DirectAdmin user');
        }
        $skin = getenv('SKIN') ?: (string)($_SERVER['SKIN'] ?? 'enhanced');
        $lang = self::readLanguage($username) ?: $settings->defaultLanguage();
        return new self($username, $skin, $lang);
    }

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

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

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

    public function hasPluginAccess(Settings $settings): bool
    {
        $override = $this->configDir . '/users/' . $this->username . '.conf';
        if (is_file($override)) {
            $data = Settings::load($override);
            return $data->getBool('enabled', $settings->defaultEnable());
        }
        return $settings->defaultEnable();
    }

    private static function readLanguage(string $username): string
    {
        $path = '/usr/local/directadmin/data/users/' . $username . '/user.conf';
        if (!is_file($path)) {
            return '';
        }
        $lines = file($path, FILE_IGNORE_NEW_LINES);
        if ($lines === false) {
            return '';
        }
        foreach ($lines as $line) {
            if (str_starts_with($line, 'language=')) {
                return strtolower(trim(substr($line, 9)));
            }
        }
        return '';
    }
}