<?php

class Qs_Pdf
{
    /** @var Zend_Config */
    protected static $_config;

    public static function factory($renderer = null, $config = array())
    {
        if ($config instanceof Zend_Config) {
            $config = $config->toArray();
        }

        if (!is_array($config)) {
            throw new Exception('Config parameters must be an array or a Zend_Config object');
        }

        if (empty($renderer)) {
            $renderer = static::getConfig('renderer');
        }

        if (!is_string($renderer) || empty($renderer)) {
            throw new Exception('Renderer name must be specified in a string');
        }

        $class = 'Qs_Pdf_Renderer_' . ucfirst($renderer);

        if (!class_exists($class)) {
            Zend_Loader::loadClass($class);
        }

        $instance = new $class($config);

        if (!$instance instanceof Qs_Pdf_Renderer_RendererInterface) {
            throw new Exception("Renderer class '{$instance}' does not extend Qs_Pdf_Renderer_Interface");
        }

        return $instance;
    }

    public static function getConfig($field = null, $default = null)
    {
        if (null === static::$_config) {
            static::$_config = Qs_Config::get('pdf', Qs_Config::QS_TYPE);
        }
        if (null === $field) {
            return static::$_config;
        }
        return static::$_config->get($field, $default);
    }

}