<?php

/** DomFramework
  * @package domframework
  * @author Dominique Fournier <dominique@fournier38.fr>
  * @license BSD
  */

namespace Domframework;

/** Allow to manage the REST protocol by using the users output types
  */
class Rest
{
    /** Allowed types by default
      */
    public $allowedtypes = array("json", "xml", "txt", "csv");

    /** Converted types
      */
    private $convert = array(
    "application/json" => "json",
    "application/xml"  => "xml",
    "text/plain"       => "txt",
    "text/csv"         => "csv",
    );

    /** This method allow to choose the type of plugin to use on output
      * Based on the HTTP_ACCEPT parameter provided by the user
      * @return string like "json", "xml", "txt", "csv"
      */
    public function chooseType()
    {
        $type = reset($this->allowedtypes);
        if (isset($_SERVER["HTTP_ACCEPT"])) {
            // Must work with the complete definition to match, and by the name of
            // the output plugin at the end
            $convert = array_intersect($this->convert, $this->allowedtypes);
            $type = array_search(reset($this->allowedtypes), $this->convert);
            $http = new Http();
            $type = $http->bestChoice(
                $_SERVER["HTTP_ACCEPT"],
                array_keys($convert),
                $type
            );
            $type = $this->convert[$type];
        }
        return $type;
    }

    /** Display the message (which can be a string, an array, an integer...)
      * into the type asked by the client if it is allowed.
      * By default, the JSON type is used
      * @param string $message Message to be displayed by the output type
      * @param integer|null $code HTTP code to use
      */
    public function display($message, $code = 200)
    {
        $http = new Http();
        $text = $http->codetext($code);
        header($_SERVER["SERVER_PROTOCOL"] . " $code $text");
        $type = $this->chooseType();
        $constr = __NAMESPACE__ . "\\Output$type";
        $method = "out";
        $obj = new $constr();
        $obj->$method($message);
    }
}