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<?php
namespace WPGMZA;

/**
 * The AutoLoader class can be used to scan a directory and register any
 * classes found in the PHP files there, recursively.
 *
 * These classes will be registered for autoloading.
 *
 * This class may be built on to use a JSON cache in the future.
 */
class AutoLoader
{
    protected $filenamesByClass;
    
    /**
     * The AutoLoader constructor.
     */
    public function __construct()
    {
         // TODO: Maybe cache these in a JSON object and only refreshin developer mode
         
         $this->filenamesByClass = array();
    }
    
    /**
     * Updates the JSON cache of classes
     * @todo implement
     * @return void
     */
    protected function updateCache()
    {
        // TODO: Not yet implemented
        
        /*$dst = plugin_dir_path(__FILE__) . 'classes.json';
        
        $json = json_encode((object)array(
            'filenamesByClass' => $this->filenamesByClass
        ));
        
        file_put_contents($dst, $json);*/
    }
    
    /**
     * Gets the first class defined in the specified file
     * @param string $file The file to scan for a class
     * @return string The fully qualified class, or NULL if none found
     * NB: With thanks to netcoder - https://stackoverflow.com/questions/7153000/get-class-name-from-file
     */
    public function getClassesInFile($file)
    {
        $fp = fopen($file, 'r');
        $class = $namespace = $buffer = '';
        $i = 0;
        $results = array();
        
        $buffer = file_get_contents($file);
        
        if(!function_exists('token_get_all'))
        {
            // Regex fallback for users without token_get_all
            
            if(preg_match('/^\s*namespace\s+(.+);/m', $buffer, $m))
                $namespace = '\\' . trim($m[1]);
            
            if(preg_match('/^(abstract)?\s*class\s+(\w+)/m', $buffer, $m))
                $class = trim($m[2]);
            
            $result = $namespace . '\\' . $class;
        }
        else
        {
            $tokens = @token_get_all($buffer);

            for (;$i<count($tokens);$i++) {
                if ($tokens[$i][0] === T_NAMESPACE) {
                    for ($j=$i+1;$j<count($tokens); $j++) {
                        if ($tokens[$j][0] === T_STRING) {
                             $namespace .= '\\'.$tokens[$j][1];
                        } else if ($tokens[$j] === '{' || $tokens[$j] === ';') {
                             break;
                        }
                    }
                }

                if ($tokens[$i][0] === T_CLASS) {
                    for ($j=$i+1;$j<count($tokens);$j++) {
                        if ($tokens[$j] === '{') {
                            $class = $tokens[$i+2][1];
                        }
                    }
                }
                
                if(!empty($class))
                    break;
            }
            
            $result = $namespace . '\\' . $class;
        }
        
        if(empty($class))
            return null;
        
        return $result;
    }
    
    /**
     * Gets all the classes in PHP files in the specified path, recursively
     * @param string $path The path to scan
     * @return array An array of all the fully qualified 
     */
    public function getClassesInPathByFilename($path)
    {
        // var_dump("Getting classes in $path");
        
        $results = array();
        
        $dir    = new \RecursiveDirectoryIterator($path);
        $iter   = new \RecursiveIteratorIterator($dir);
        $regex  = new \RegexIterator($iter, '/^.+(\.php)$/i', \RecursiveRegexIterator::GET_MATCH);
        
        foreach($regex as $m) {
            $file = $m[0];
            $classes = $this->getClassesInFile($file);
            $results[$file] = $classes;
        }
        
        return $results;
    }
    
    /**
     * Recursively scans all PHP files in the given patch and registers any classes found.
     * @param string $path The path to scan
     * @return void
     */
    public function registerClassesInPath($path)
    {
        global $wpgmza;
        
        //$cacheFile = $relative . 'includes/auto-loader-cache.json';
        //$useCache = empty($wpgmza->settings->developer_mode) && file_exists($cacheFile);
        
        $classesByFilename = $this->getClassesInPathByFilename($path);
            
        foreach($classesByFilename as $file => $class)
        {
            if(!empty($class))
                $this->filenamesByClass[$class] = $file;
        }
        
        $this->updateCache();
    }
    
    /**
     * This function is registered with PHPs native spl_autoloader_register to require the file associated with the class. This function is to be treated as private and should only be called by PHP itself.
     * @internal
     * @param string $class The class passed in by PHP
     * @return void
     */
    public function callback($class)
    {
        $pattern = "/^(\\\\?)WPGMZA/";
        
        if(!preg_match($pattern, $class, $m))
            return;
        
        if(empty($m[1]))
            $class = '\\' . $class;
        
        if(!isset($this->filenamesByClass[$class]))
            return;
        
        $file = $this->filenamesByClass[$class];
        
        require_once( $file );
    }
    
}

global $wpgmza_auto_loader;
$wpgmza_auto_loader = new AutoLoader();
$wpgmza_auto_loader->registerClassesInPath(__DIR__);

spl_autoload_register(array($wpgmza_auto_loader, 'callback'));