<?php

// This autoloader provide convinient way to working with mock object
// make the test looks natural. This autoloader support cascade file loading as well
// within mocks directory.
//
// Prototype :
//
// $mock_table = new Mock_Libraries_Table();            // Will load ./mocks/libraries/table.php
// $mock_database_driver = new Mock_Database_Driver();  // Will load ./mocks/database/driver.php
// and so on...
function autoload($class)
{
    $dir = realpath(dirname(__FILE__)).DIRECTORY_SEPARATOR;

    $ci_core = array(
        'Benchmark', 'Config', 'Controller',
        'Exceptions', 'Hooks', 'Input',
        'Lang', 'Loader', 'Log', 'Model',
        'Output', 'Router', 'Security',
        'URI', 'Utf8',
    );

    $ci_libraries = array(
        'Calendar', 'Cart', 'Driver_Library',
        'Email', 'Encrypt', 'Form_validation',
        'Ftp', 'Image_lib', 'Javascript',
        'Migration', 'Pagination', 'Parser',
        'Profiler', 'Table', 'Trackback',
           'Typography', 'Unit_test', 'Upload',
           'User_agent', 'Xmlrpc', 'Zip'
    );

    $ci_drivers = array(
        'Session',
    );

    if (strpos($class, 'Mock_') === 0)
    {
        $class = strtolower(str_replace(array('Mock_', '_'), array('', DIRECTORY_SEPARATOR), $class));
    }
    elseif (strpos($class, 'CI_') === 0)
    {
        $subclass = substr($class, 3);

        if (in_array($subclass, $ci_core))
        {
            $dir = SYSTEM_PATH.'core'.DIRECTORY_SEPARATOR;
            $class = $subclass;
        }
        elseif (in_array($subclass, $ci_libraries))
        {
            $dir = SYSTEM_PATH.'libraries'.DIRECTORY_SEPARATOR;
            $class = ($subclass === 'Driver_Library') ? 'Driver' : $subclass;
        }
        elseif (in_array($subclass, $ci_drivers))
        {
            $dir = SYSTEM_PATH.'libraries'.DIRECTORY_SEPARATOR.$subclass.DIRECTORY_SEPARATOR;
            $class = $subclass;
        }
        elseif (in_array(($parent = strtok($subclass, '_')), $ci_drivers)) {
            $dir = SYSTEM_PATH.'libraries'.DIRECTORY_SEPARATOR.$parent.DIRECTORY_SEPARATOR.'drivers'.DIRECTORY_SEPARATOR;
            $class = $subclass;
        }
        elseif (preg_match('/^CI_DB_(.+)_(.+)_(driver|forge|result|utility)$/', $class, $m) && count($m) === 4)
        {
            $driver_path = SYSTEM_PATH.'database'.DIRECTORY_SEPARATOR.'drivers'.DIRECTORY_SEPARATOR;
            $dir = $driver_path.$m[1].DIRECTORY_SEPARATOR.'subdrivers'.DIRECTORY_SEPARATOR;
            $file = $dir.$m[1].'_'.$m[2].'_'.$m[3].'.php';
        }
        elseif (preg_match('/^CI_DB_(.+)_(driver|forge|result|utility)$/', $class, $m) && count($m) === 3)
        {
            $driver_path = SYSTEM_PATH.'database'.DIRECTORY_SEPARATOR.'drivers'.DIRECTORY_SEPARATOR;
            $dir = $driver_path.$m[1].DIRECTORY_SEPARATOR;
            $file = $dir.$m[1].'_'.$m[2].'.php';
        }
        elseif (strpos($class, 'CI_DB') === 0)
        {
            $dir = SYSTEM_PATH.'database'.DIRECTORY_SEPARATOR;
            $file = $dir.str_replace(array('CI_DB','active_record'), array('DB', 'active_rec'), $subclass).'.php';
        }
        else
        {
            $class = strtolower($class);
        }
    }

    $file = isset($file) ? $file : $dir.$class.'.php';

    if ( ! file_exists($file))
    {
        return FALSE;
    }

    include_once($file);
}