<?php


namespace Friendica\Module\Special;

use Friendica\Core\L10n;
use Friendica\Core\Logger;
use Friendica\Core\Renderer;
use Friendica\Core\System;

/**
 * This special module displays HTTPException when they are thrown in modules.
 *
 * @package Friendica\Module\Special
 */
class HTTPException
{
	/**
	 * Generates the necessary template variables from the caught HTTPException.
	 *
	 * Fills in the blanks if title or descriptions aren't provided by the exception.
	 *
	 * @param \Friendica\Network\HTTPException $e
	 * @return array ['$title' => ..., '$description' => ...]
	 */
	private static function getVars(\Friendica\Network\HTTPException $e)
	{
		$message = $e->getMessage();

		$titles = [
			200 => 'OK',
			400 => L10n::t('Bad Request'),
			401 => L10n::t('Unauthorized'),
			403 => L10n::t('Forbidden'),
			404 => L10n::t('Not Found'),
			500 => L10n::t('Internal Server Error'),
			503 => L10n::t('Service Unavailable'),
		];
		$title = ($titles[$e->getCode()] ?? '') ?: 'Error ' . $e->getCode();

		if (empty($message)) {
			// Explanations are taken from https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
			$explanation = [
				400 => L10n::t('The server cannot or will not process the request due to an apparent client error.'),
				401 => L10n::t('Authentication is required and has failed or has not yet been provided.'),
				403 => L10n::t('The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource, or may need an account.'),
				404 => L10n::t('The requested resource could not be found but may be available in the future.'),
				500 => L10n::t('An unexpected condition was encountered and no more specific message is suitable.'),
				503 => L10n::t('The server is currently unavailable (because it is overloaded or down for maintenance). Please try again later.'),
			];

			$message = $explanation[$e->getCode()] ?? '';
		}

		return ['$title' => $title, '$message' => $message, '$back' => L10n::t('Go back')];
	}

	/**
	 * Displays a bare message page with no theming at all.
	 *
	 * @param \Friendica\Network\HTTPException $e
	 * @throws \Exception
	 */
	public static function rawContent(\Friendica\Network\HTTPException $e)
	{
		$content = '';

		if ($e->getCode() >= 400) {
			$tpl = Renderer::getMarkupTemplate('http_status.tpl');
			$content = Renderer::replaceMacros($tpl, self::getVars($e));
		}

		System::httpExit($e->getCode(), $e->httpdesc, $content);
	}

	/**
	 * Returns a content string that can be integrated in the current theme.
	 *
	 * @param \Friendica\Network\HTTPException $e
	 * @return string
	 * @throws \Exception
	 */
	public static function content(\Friendica\Network\HTTPException $e)
	{
		header($_SERVER["SERVER_PROTOCOL"] . ' ' . $e->getCode() . ' ' . $e->httpdesc);

		$tpl = Renderer::getMarkupTemplate('exception.tpl');

		return Renderer::replaceMacros($tpl, self::getVars($e));
	}
}