<?php
/**
 * Class and Function List:
 * Function list:
 * - pick_language()
 * Classes list:
 */
defined('BASEPATH') OR exit('No direct script access allowed.');
/**
 * Determines the language to use.
 *
 * This is called from the Codeigniter hook system.
 * The hook is defined in application/config/hooks.php
 */

function pick_language() 
{
	require APPPATH . '/config/language.php';

	// Re-populate $_GET
	parse_str($_SERVER['QUERY_STRING'], $_GET);

	// Lang set in URL via ?lang=something
	
	if (!empty($_GET['lang'])) 
	{

		// Turn en-gb into en
		$lang = strtolower(substr($_GET['lang'], 0, 2));
	}

	// Lang has already been set and is stored in a session
	elseif (!empty($_SESSION['lang_code'])) 
	{
		$lang = $_SESSION['lang_code'];
	}

	// Lang has is picked by a user.
	elseif (!empty($_COOKIE['lang_code'])) 
	{
		$lang = strtolower($_COOKIE['lang_code']);
	}

	// Still no Lang. Lets try some browser detection then
	elseif (!empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) 
	{

		// explode languages into array
		$accept_langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
		$supported_languages = $config['supported_languages'];

		// Check them all, until we find a match
		foreach ($accept_langs as $al) 
		{

			// Check its in the array. If so, break the loop, we have one!
			foreach ($supported_languages as $i => $l) 
			{
				
				if ($al == $l['codes'][2]) 
				{
					$lang = $i;
					break;
				}
			}
		}
	}

	// If no language has been worked out - or it is not supported - use the default
	
	if (empty($lang) OR !array_key_exists($lang, $config['supported_languages'])) 
	{
		$lang = $config['language'];
	}

	// Whatever we decided the lang was, save it for next time to avoid working it out again
	$_SESSION['lang_code'] = $lang;

	// Load CI config class
	$CI_config = & load_class('Config');

	// Set the language config. Selects the folder name from its key of 'en'
	$CI_config->set_item('language', $config['supported_languages'][$lang]['folder']);

	// Sets a constant to use throughout ALL of CI.
	define('AUTO_LANGUAGE', $lang);
}