<?php

namespace GeminiFoundation;

class Response
{
  protected Status $statusCode;
  protected string $meta;
  protected string $body;

  /**
   * @param Status $statusCode
   * @param string $meta
   * @param string $body
   */
  public function __construct(
    $statusCode = Status::SUCCESS,
    $meta = '',
    $body = ''
  )
  {
    $this->statusCode = $statusCode;
    $this->meta = $meta;
    $this->body = $body;
  }

  public static function fromString(string $string): static
  {
    $parts = explode("\r\n", $string);
    $header = $parts[0];
    $headerParts = explode(' ', $header);
    $statusCode = Status::from(intval($headerParts[0]));
    $meta = implode(' ', array_slice($headerParts, 1));
    $body = implode("\r\n", array_slice($parts, 1));

    return new self($statusCode, $meta, $body);
  }

  public function setStatusCode(Status|int $statusCode): static
  {
    $this->statusCode = $statusCode;

    return $this;
  }

  public function getStatusCode(): Status|int
  {
    return $this->statusCode;
  }

  public function setMeta(string $meta): static
  {
    $this->meta = $meta;

    return $this;
  }

  public function getMeta(): string
  {
    return $this->meta;
  }

  public function setBody(string $body): static
  {
    $this->body = $body;

    return $this;
  }

  public function getBody(): string
  {
    return $this->body;
  }

  public function append(string $string): static
  {
    $this->body .= $string;

    return $this;
  }

  public function getHeader(): string
  {
    return "{$this->statusCode->value} {$this->meta}\r\n";
  }

  public function prepareResponse(): static
  {
    if ($this->statusCode == Status::SUCCESS) {
      if (empty($this->meta)) {
        $this->meta = 'text/gemini; charset=utf-8';
      }
    }

    return $this;
  }

  /**
   * @param resource $connection
   */
  public function send($connection): int
  {
    return fwrite($connection, $this);
  }

  public function __toString(): string
  {
    $this->prepareResponse();

    return "{$this->getHeader()}{$this->body}";
  }
}