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<?php

namespace Spatie\DbDumper;

use Spatie\DbDumper\Exceptions\InvalidDatabaseUrl;

class DsnParser
{
    protected string $dsn;

public function __construct(string $dsn)
    {
        $this->dsn = $dsn;
    }

public function parse(): array
    {
        $rawComponents = $this->parseUrl($this->dsn);

$decodedComponents = $this->parseNativeTypes(
            array_map('rawurldecode', $rawComponents)
        );

return array_merge(
            $this->getPrimaryOptions($decodedComponents),
            $this->getQueryOptions($rawComponents)
        );
    }

protected function getPrimaryOptions($url): array
    {
        return array_filter([
            'database' => $this->getDatabase($url),
            'host' => $url['host'] ?? null,
            'port' => $url['port'] ?? null,
            'username' => $url['user'] ?? null,
            'password' => $url['pass'] ?? null,
        ], static fn ($value) => ! is_null($value));
    }

protected function getDatabase($url): ?string
    {
        $path = $url['path'] ?? null;

if (! $path) {
            return null;
        }

if ($path === '/') {
            return null;
        }

if (isset($url['scheme']) && str_contains($url['scheme'], 'sqlite')) {
            return $path;
        }

return trim($path, '/');
    }

protected function getQueryOptions($url)
    {
        $queryString = $url['query'] ?? null;

if (! $queryString) {
            return [];
        }

$query = [];

parse_str($queryString, $query);

return $this->parseNativeTypes($query);
    }

protected function parseUrl($url): array
    {
        $url = preg_replace('#^(sqlite3?):///#', '$1://null/', $url);

$parsedUrl = parse_url($url);

if ($parsedUrl === false) {
            throw InvalidDatabaseUrl::invalidUrl($url);
        }

return $parsedUrl;
    }

protected function parseNativeTypes($value)
    {
        if (is_array($value)) {
            return array_map([$this, 'parseNativeTypes'], $value);
        }

if (! is_string($value)) {
            return $value;
        }

$parsedValue = json_decode($value, true);

if (json_last_error() === JSON_ERROR_NONE) {
            return $parsedValue;
        }

return $value;
    }
}