import requests
import json
import pickle
import os


class auto_arima():
    def __init__(self, apikey) -> None:
        self.apikey = apikey

    def parse_res(self, res):
        if str(res.status_code)[0] != '2':
            raise ValueError('auto_arima API Call Failed!\n', res.text)
        else:
            parsed_res = res.json()
            return parsed_res

    def forecast(
            self,
            ts_list,
            n_predict: int,
            seasonal_cycle=None):
        endpoint = 'https://idsc.com.sg/foretell/prediction/time-series/continuous/arima'

        payloads = {
            'time_series_data': ts_list,
            'num_predict': n_predict}

        headers = {'api-key': self.apikey}

        res = requests.post(endpoint, json=payloads, headers=headers)

        self.__save_res(res)

        print('auto_arima_______')
        print(res)

        return self.parse_res(res)

    def __save_res(self, res):
        # The successful res is based on "data/test.csv"
        script_dir = os.path.dirname(__file__)
        rel_path = "./tests/auto_arima_success_res.dict"
        abs_file_path = os.path.join(script_dir, rel_path)

        with open(abs_file_path, 'wb') as f:
            pickle.dump(res, f)

    def __load_res(self):
        # The successful res is based on "data/test.csv"
        script_dir = os.path.dirname(__file__)
        rel_path = "./tests/auto_arima_success_res.dict"
        abs_file_path = os.path.join(script_dir, rel_path)

        with open(abs_file_path, 'rb') as f:
            res = pickle.load(f)

        return res