<?php
/**
 * @package   com_zoo
 * @author    YOOtheme http://www.yootheme.com
 * @copyright Copyright (C) YOOtheme GmbH
 * @license   http://www.gnu.org/licenses/gpl.html GNU/GPL
 */

/**
 * Read and write data in JSON format
 * 
 * @package Framework.Data
 */
class JSONData extends AppData {

    /**
	 * If the returned object will be an associative array (default :true)
	 * 
	 * @var boolean
	 * @since 1.0.0 
	 */
	protected $_assoc = true;

	/**
	 * Class Constructor
	 * 
	 * @param string|array $data The data to read. Could be either an array or a json string
	 * 
	 * @since 1.0.0
	 */
	public function __construct($data = array()) {

		// decode JSON string
		if (is_string($data)) {
			$data = json_decode($data, $this->_assoc);
		}

		parent::__construct($data);
	}

	/**
	 * Encode an array or an object in JSON format
	 * 
	 * @param array|object $data The data to encode
	 * 
	 * @return string The json encoded string
	 * 
	 * @since 1.0.0
	 */
	protected function _write($data) {
		return $this->_jsonEncode($data);
	}

	/**
	 * Do the real json encoding adding human readability. Supports automatic indenting with tabs
	 * 
	 * @param array|object $in The array or object to encode in json
	 * @param int $indent The indentation level. Adds $indent tabs to the string
	 * 
	 * @return string The json encoded string
	 * 
	 * @since 1.0.0
	 */
	public function _jsonEncode($in, $indent = 0)	{
		$out = '';

		foreach ($in as $key => $value) {

			$out .= str_repeat("\t", $indent + 1);
			$out .= json_encode((string) $key).': ';

			if (is_object($value) || is_array($value)) {
				$out .= $this->_jsonEncode($value, $indent + 1);
			} else {
				$out .= json_encode($value);
			}

			$out .= ",\n";
		}

		if (!empty($out)) {
			$out = substr($out, 0, -2);
		}

		$out = " {\n" . $out;
		$out .= "\n" . str_repeat("\t", $indent) . "}";

		return $out;
	}
}