<?php

declare(strict_types=1);

namespace Weerscherm;

final class Config
{
    private const DEFAULTS = [
        'data_source' => 'fixture',
        'netatmo_client_id' => '',
        'netatmo_client_secret' => '',
        'netatmo_device_id' => null,
        'timezone' => 'Europe/Berlin',
        'forecast_lat' => null,
        'forecast_lon' => null,
        'indoor_modules' => [],
        'cache_ttl' => [
            'stations' => 300,
            'measure' => 900,
            'pressure' => 900,
            'forecast' => 3600,
            'radar' => 240,
        ],
        'storage_path' => null,
    ];

    /** @param array<string, mixed> $values */
    private function __construct(private readonly array $values)
    {
    }

    public static function load(string $file): self
    {
        if (!is_file($file)) {
            throw new \RuntimeException("Configuratiebestand ontbreekt: $file");
        }
        $raw = require $file;
        if (!is_array($raw)) {
            throw new \RuntimeException("Configuratiebestand moet een array teruggeven: $file");
        }

        $values = array_replace(self::DEFAULTS, $raw);
        $values['cache_ttl'] = array_replace(self::DEFAULTS['cache_ttl'], is_array($raw['cache_ttl'] ?? null) ? $raw['cache_ttl'] : []);
        $values['storage_path'] ??= dirname($file) . '/storage';

        return new self($values);
    }

    public function get(string $key, mixed $default = null): mixed
    {
        return array_key_exists($key, $this->values) ? $this->values[$key] : $default;
    }
}