class Configurator

final class Configurator {
    
    /** @var Closure(InstrumentationScopeInterface): T */
    private readonly Closure $factory;
    
    /** @var WeakMap<InstrumentationScopeInterface, T> */
    private WeakMap $configs;
    
    /** @var list<ConfiguratorClosure> */
    private array $configurators = [];
    
    /**
     * @param Closure(InstrumentationScopeInterface): T $factory
     * @psalm-suppress PropertyTypeCoercion
     */
    public function __construct(Closure $factory) {
        $this->configs = new WeakMap();
        $this->factory = $factory;
    }
    
    /**
     * @param Closure(T, InstrumentationScopeInterface): void $closure
     */
    public function with(Closure $closure, ?string $name, ?string $version = null, ?string $schemaUrl = null) : self {
        $this->configurators[] = $configurator = new ConfiguratorClosure($closure, self::namePattern($name), $version, $schemaUrl);
        foreach ($this->configs as $instrumentationScope => $config) {
            if ($configurator->matches($instrumentationScope)) {
                ($configurator->closure)($config, $instrumentationScope);
            }
        }
        return $this;
    }
    
    /**
     * @return T
     */
    public function resolve(InstrumentationScopeInterface $instrumentationScope) : Config {
        if ($config = $this->configs[$instrumentationScope] ?? null) {
            return $config;
        }
        $config = ($this->factory)($instrumentationScope);
        foreach ($this->configurators as $configurator) {
            if ($configurator->matches($instrumentationScope)) {
                ($configurator->closure)($config, $instrumentationScope);
            }
        }
        return $this->configs[$instrumentationScope] ??= $config;
    }
    
    /**
     * Create a default Configurator for a LoggerConfig
     * @return Configurator<LoggerConfig>
     */
    public static function logger() : self {
        return new Configurator(static fn() => new LoggerConfig());
    }
    
    /**
     * Create a default Configurator for a MeterConfig
     * @return Configurator<MeterConfig>
     */
    public static function meter() : self {
        return new Configurator(static fn() => new MeterConfig());
    }
    
    /**
     * Create a default Configurator for a TracerConfig
     * @return Configurator<TracerConfig>
     */
    public static function tracer() : self {
        return new Configurator(static fn() => new TracerConfig());
    }
    private static function namePattern(?string $name) : ?string {
        return $name !== null ? sprintf('/^%s$/', strtr(preg_quote($name, '/'), [
            '\\?' => '.',
            '\\*' => '.*',
        ])) : null;
    }

}