<?php

declare(strict_types=1);

final class AiConfigRepository
{
    private string $path;

    public function __construct()
    {
        $this->path = storage_path('system/ai.json');
    }

    public function get(): array
    {
        $saved = decode_json_file($this->path, []);
        $config = array_replace($this->defaults(), is_array($saved) ? $saved : []);

        $config['model'] = trim((string) ($config['model'] ?? $this->defaults()['model']));
        if ($config['model'] === '') {
            $config['model'] = $this->defaults()['model'];
        }

        $config['timeout'] = max(5, min(120, (int) ($config['timeout'] ?? $this->defaults()['timeout'])));

        return $config;
    }

    public function save(array $input): array
    {
        $config = [
            'model' => trim((string) ($input['model'] ?? $this->defaults()['model'])),
            'timeout' => max(5, min(120, (int) ($input['timeout'] ?? $this->defaults()['timeout']))),
        ];

        if ($config['model'] === '') {
            $config['model'] = $this->defaults()['model'];
        }

        $directory = dirname($this->path);
        if (!is_dir($directory)) {
            mkdir($directory, 0775, true);
        }

        $bytes = file_put_contents(
            $this->path,
            json_encode($config, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
            LOCK_EX
        );

        if ($bytes === false) {
            throw new RuntimeException('Die KI-Konfiguration konnte nicht gespeichert werden.');
        }

        return $config;
    }

    private function defaults(): array
    {
        $model = trim((string) ($_ENV['OPENAI_MODEL'] ?? getenv('OPENAI_MODEL') ?: 'gpt-4o-mini'));
        $timeout = (int) ($_ENV['OPENAI_TIMEOUT'] ?? getenv('OPENAI_TIMEOUT') ?: 25);

        return [
            'model' => $model !== '' ? $model : 'gpt-4o-mini',
            'timeout' => max(5, min(120, $timeout > 0 ? $timeout : 25)),
        ];
    }
}