class Response

final class Response {
    private array $jsonData;
    
    /**
     * The headers array is a set of key/value pairs. If a header is present multiple times
     * then the value is an array of all the values.
     *
     * @param string $content The content of the response
     * @param int    $status  The response status code (302 "Found" by default)
     * @param array  $headers An array of headers
     */
    public function __construct(string $content = '', int $status = 200, array $headers = []) {
    }
    
    /**
     * Converts the response object to string containing all headers and the response content.
     */
    public function __toString() : string {
        $headers = '';
        foreach ($this->headers as $name => $value) {
            if (\is_string($value)) {
                $headers .= \sprintf("%s: %s\n", $name, $value);
            }
            else {
                foreach ($value as $headerValue) {
                    $headers .= \sprintf("%s: %s\n", $name, $headerValue);
                }
            }
        }
        return $headers . "\n" . $this->content;
    }
    public function getContent() : string {
        return $this->content;
    }
    public function getStatusCode() : int {
        return $this->status;
    }
    public function getHeaders() : array {
        return $this->headers;
    }
    
    /**
     * @return string|array|null The first header value if $first is true, an array of values otherwise
     */
    public function getHeader(string $header, bool $first = true) : string|array|null {
        $normalizedHeader = str_replace('-', '_', strtolower($header));
        foreach ($this->headers as $key => $value) {
            if (str_replace('-', '_', strtolower($key)) === $normalizedHeader) {
                if ($first) {
                    return \is_array($value) ? \count($value) ? $value[0] : '' : $value;
                }
                return \is_array($value) ? $value : [
                    $value,
                ];
            }
        }
        return $first ? null : [];
    }
    public function toArray() : array {
        if (isset($this->jsonData)) {
            return $this->jsonData;
        }
        try {
            $content = json_decode($this->content, true, flags: \JSON_BIGINT_AS_STRING | \JSON_THROW_ON_ERROR);
        } catch (\JsonException $e) {
            throw new JsonException($e->getMessage(), $e->getCode(), $e);
        }
        if (!\is_array($content)) {
            throw new JsonException(\sprintf('JSON content was expected to decode to an array, "%s" returned.', get_debug_type($content)));
        }
        return $this->jsonData = $content;
    }

}