#!/usr/bin/env /usr/bin/python3
# -*- coding:utf-8 -*-
import json
from typing import List

from pyspark.sql.functions import udf
from pyspark.sql.types import *


def array_to_json(arr: List):
    return json.dumps(arr, ensure_ascii=False)


@udf(returnType=ArrayType(StringType()))
def arr_str_to_arr(json_str: str) -> list:
    if json_str:
        return json.loads(json_str)
    return []


@udf(ArrayType(StringType()))
def array_slice(input_array, start, end):
    if input_array:
        result_array = input_array[start:end]
        return result_array
    return []


@udf(ArrayType(StringType()))
def str_to_json_arr(json_str):
    if json_str:
        try:
            str_arr = json.loads(json_str)
            if isinstance(str_arr, list):
                return [json.dumps(sm) for sm in str_arr]
        except json.JSONDecodeError:
            return []
    return []