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<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

require_once(APPPATH . 'libraries/tokens/Token.php');

class Token_lib
{
    private $CI;

    public function __construct()
    {
        $this->CI =& get_instance();
    }

    /**
     * Expands all of the tokens found in a given text string and returns the results.
     */
    public function render($tokened_text)
    {

        // Transform legacy "$" tokens to their brace token equivalent
        if(strpos($tokened_text, '$') !== FALSE)
        {
            $tokened_text = str_replace('$YCO', '{YCO}', $tokened_text);
            $tokened_text = str_replace('$CO', '{CO}', $tokened_text);
            $tokened_text = str_replace('$SCO', '{SCO}', $tokened_text);
            $tokened_text = str_replace('$CU', '{CU}', $tokened_text);
        }

        // Apply the transformation for the "%" tokens if any are used
        if(strpos($tokened_text, '%') !== FALSE)
        {
            $tokened_text = strftime($tokened_text);
        }

        // Call scan to build an array of all of the tokens used in the text to be transformed
        $token_tree = $this->scan($tokened_text);

        if(empty($token_tree))
        {
            if(strpos($tokened_text, '%') !== FALSE)
            {
                return strftime($tokened_text);
            }
            else
            {
                return $tokened_text;
            }
        }

        $token_values = array();
        $tokens_to_replace = array();
        $this->generate($token_tree, $tokens_to_replace, $token_values);

        return str_replace($tokens_to_replace, $token_values, $tokened_text);
    }

    /**
     * Parses out the all of the tokens enclosed in braces {} and subparses on the colon : character where supplied
     */
    public function scan($text)
    {
        // Matches tokens with the following pattern: [$token:$length]
        preg_match_all('/
      \{             # [ - pattern start
      ([^\s\{\}:]+)  # match $token not containing whitespace : { or }
      (?:
      :              # : - separator
      ([^\s\{\}:]+)     # match $length not containing whitespace : { or }
      )?
      \}             # ] - pattern end
      /x', $text, $matches);

        $tokens = $matches[1];
        $lengths = $matches[2];

        $token_tree = array();
        for($i = 0; $i < count($tokens); $i++) {
            $token_tree[$tokens[$i]][$lengths[$i]] = $matches[0][$i];
        }

        return $token_tree;
    }

    public function generate($used_tokens, &$tokens_to_replace, &$token_values)
    {
        foreach($used_tokens as $token_code => $token_info)
        {
            // Generate value here based on the key value
            $token_value = (new Token())->replace($token_code);

            foreach($token_info as $length => $token_spec)
            {
                $tokens_to_replace[] = $token_spec;
                if(!empty($length))
                {
                    $token_values[] = str_pad($token_value, $length, '0', STR_PAD_LEFT);
                }
                else
                {
                    $token_values[] = $token_value;
                }
            }
        }
        return $token_values;
    }
}

?>