public class JsonUtils {

    /**
     * Read File contents into JsonObject
     * @param path path to a file that should be read
     * @return JsonObject with contents of file
     */
    public static JsonObject readJsonFile(String path) {
        String json = FileIOUtils.readFile(path);
        return convertStringToJsonObject(json);
    }

    /**
     * Converts String to JsonObject
     * @param json_str the Json String to be returned as JsonObject
     * @return JsonObject
     */
    public static JsonObject convertStringToJsonObject(String json_str) {
        return new Gson().fromJson(json_str, JsonObject.class);
    }

    public static ArrayList<String> jsonObjectToStringArrayList(JsonObject in) {
        ArrayList<String> res = new ArrayList<>();

        for (JsonElement jsonElm : in.getAsJsonArray()) {
            System.out.println(jsonElm);
            res.add(jsonElm.toString());
        }

        return res;
    }


    /**
     * prints out a test json object to test if json functions work
     * @param json the JsonObject to print out
     */
    public static void debug(JsonObject json) {
        if (NoWay.dev) { // only print if dev version
            System.out.println("Non Formatted: " + new Gson().toJson(json));
            System.out.println("Formatted: " + formatJsonObjectToString(json));
            System.out.println("Conv to JsonObj: " + convertStringToJsonObject(formatJsonObjectToString(json)).getClass() + " -> " + convertStringToJsonObject(formatJsonObjectToString(json)));
        }
    }


    /**
     * Format JsonObject
     * Input: {"a":"b","c":"d"}
     * Output: {
     *     "a": "b",
     *     "c": "d"
     * }
     *
     * @param jsonObject JsonObject input
     * @return JsonObject formatted and converted to String
     */
    public static String formatJsonObjectToString(JsonObject jsonObject) {
        if (jsonObject.isJsonNull() || jsonObject.equals(new JsonObject())) return "{ }";

        String gson_obj = new Gson().toJson(jsonObject);
        StringBuilder sb = new StringBuilder();
        int indent = 0;
        for (int i = 0; i < gson_obj.length(); i++) {
            char c = gson_obj.charAt(i);
            if (c == '{') {
                sb.append(c);
                if (gson_obj.charAt(i + 1) == '}')
                    sb.append(" ");
                else {
                    sb.append("\n");
                    indent++;
                    for (int j=0; j < indent; j++)
                        sb.append("\t");
                }
            } else if (c == '}') {
                if (gson_obj.charAt(i - 1) != '{') {
                    sb.append("\n");
                    indent--;
                    for (int j=0; j < indent; j++)
                        sb.append("\t");
                }
                sb.append(c);
            } else if (c == ',') {
                sb.append(c);
                sb.append("\n");
                for (int j=0; j < indent; j++)
                    sb.append("\t");
            } else if (c == ':') {
                sb.append(c);
                sb.append(" ");
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * String to json to formatJsonObjectToString(JsonObject)
     * @param jsonString String input
     * @return String output
     */
    public static String formatJsonString(String jsonString) {
        return formatJsonObjectToString(convertStringToJsonObject(jsonString));
    }


}