<?php

class response {
    private int $code;
    private array $parsed;
    private array $headers;
    private string $version;
    private string $content;

    public function __construct(string $content) {
        $parts = explode("\r\n\r\n", $content);
        $head = array_shift($parts);
        $body = join("\r\n\r\n", $parts);

        $this->parse_head($head);
        $this->parse_body($body);
    }

    public function get_code(): int {
        return $this->code;
    }

    public function get_version(): string {
        return $this->version;
    }

    public function get_header(
        string $name, 
        ?string $fallback = null
    ): ?string {
        if (array_key_exists($name, $this->headers)) {
            return $this->headers[$name];
        }

        return $fallback;
    }

    public function get_content(): string {
        return $this->content;
    }

    public function get_json_content(): array {
        return $this->parsed;
    }

    private function parse_body(string $body): void {
        $type = $this->get_header('Content-Type', 'text/plain'));
        $is_json = strpos($type, 'json') !== -1;

        $this->content = $body;        
        $this->parsed = array();

        if ($is_json) {
            $this->parsed = json_decode($body);
        }
    }

    private function parse_head(string $head): void {
        $lines = explode("\r\n", $head);
        $first = array_shift($lines);
        
        $this->parse_first_line($first);
        $this->parse_headers($lines);
    }

    private function parse_first_line(string $line): void {
        $parts = explode(' ', $line);
        $this->version = array_shift($parts);
        $this->code = int(array_shift($parts));
    }

    private function parse_headers(array $lines): void {
        $this->headers = array();

        foreach ($lines as $line) {
            $parts = explode(':', $line);
            $name = array_shift($parts);
            $content = ltrim(join(':', $parts));

            $this->headers[$name] = $content;
        }
    }
}