<?php

namespace Lib;

class Json
{

    // indents a json string so it is more human readable
    public static function indent($json)
    {

        $result = '';
        $pos = 0;
        $strLen = strlen($json);
        $indentStr = '  ';
        $newLine = "\n";
        $prevChar = '';
        $outOfQuotes = true;

        for ($i = 0; $i <= $strLen; $i++) {

            // Grab the next character in the string.
            $char = substr($json, $i, 1);

            // Are we inside a quoted string?
            if ($char == '"' && $prevChar != '\\') {
                $outOfQuotes = !$outOfQuotes;

                // If this character is the end of an element, 
                // output a new line and indent the next line.
            } else if (($char == '}' || $char == ']') && $outOfQuotes) {
                $result .= $newLine;
                $pos--;
                for ($j = 0; $j < $pos; $j++) {
                    $result .= $indentStr;
                }
            }

            // Add the character to the result string.
            $result .= $char;

            // If the last character was the beginning of an element, 
            // output a new line and indent the next line.
            if (($char == ',' || $char == '{' || $char == '[') && $outOfQuotes) {
                $result .= $newLine;
                if ($char == '{' || $char == '[') {
                    $pos++;
                }

                for ($j = 0; $j < $pos; $j++) {
                    $result .= $indentStr;
                }
            }

            $prevChar = $char;
        }

        return $result;
    }

    // encodes and indents a json string
    public static function encode($json)
    {
        return Json::indent(
            json_encode($json)
        );
    }

    public static function decode($json)
    {
        return json_decode($json, true);
    }

    public static function get_var($var_name, $o, $add_var_text = true)
    {
        if ($add_var_text) {
            echo 'var ';
        }
        echo $var_name . ' = ' . Json::encode($o) . ';';
    }
}