<?php

namespace BSR\Webservice\Formatter;

abstract class Formatter {
    private static $formats = array();

    /**
     * @param array $formats New available formats, array(mimetype => class)
     */
    protected static function registerFormats(array $formats) {
        foreach($formats as $f) {
            self::$formats[$f] = get_called_class();
        }
    }

    /**
     * @return Formatter The formatter to use for this request
     */
    public static function getFormatter() {
        self::loadFormatters();
        $format = self::getFormatFromHeader();

        return new $format();
    }

    /**
     * Load all formatters in the current directory
     */
    private static function loadFormatters() {
        preg_match('/(.+)\\\([a-zA-Z0-9]+)/', get_called_class(), $parts);
        $us = $parts[2];
        $namespace = $parts[1];

        $base = __DIR__.'/';
        $ext = '.php';
        $files = glob(sprintf('%s%s%s', $base, '*', $ext));
        foreach($files as $f) {
            $c = str_replace(array($base, $ext), '', $f);
            if($c !== $us) {
                $c = $namespace.'\\'.$c;
                call_user_func(array($c, 'init'));
            }
        }
    }

    /**
     * @return string The class name to instantiate in accord to the Accept header
     */
    private static function getFormatFromHeader() {
        //TODO this is ugly
		return 'BSR\Webservice\Formatter\Json';
        if(isset($_SERVER['HTTP_ACCEPT'])) {
            $formats = array_map(function($f) {
                $parts = explode(';', $f);
                $parts[1] = (isset($parts[1]) ? (float) preg_replace('/[^0-9\.]/', '', $parts[1]) : 1.0) * 100;
                return $parts;
            }, explode(',', $_SERVER['HTTP_ACCEPT']));

            usort($formats, function($a, $b) { return $b[1]  - $a[1]; });

            foreach($formats as $f) {
                if(isset(self::$formats[$f[0]])) {
                    return self::$formats[$f[0]];
                }
            }

        }

        return 'BSR\Webservice\Formatter\Json';
    }

    /**
     * Output the content for the given data
     * @param array $data
     */
    abstract public function render($data);
}