import argparse
import httpx
import json
import datetime


class MiIndicador:
    def __init__(self, base_url: str = None):
        if base_url is None:
            base_url = 'https://mindicador.cl/api'
        self.base_url = base_url

    def __build_url(self, sub_url: str, query: str = ''):
        sub = sub_url
        if query != '':
            sub = '?'.join([
                sub,
                query
            ])
        url = '/'.join([
            self.base_url,
            sub
        ])
        return url

    def __get(self, url: str):
        resp = httpx.get(url)
        if resp.status_code != httpx.codes.OK:
            raise Exception(resp.reason_phrase)
        return json.loads(resp.text)

    def list(self):
        url = self.__build_url('')
        return self.__get(url)

    def get(self, indicador: str, fecha: str = None):
        url = indicador
        if fecha is not None:
            url = '/'.join([url, fecha])
        url = self.__build_url(url)
        res = self.__get(url)
        for i, item in enumerate(res['serie']):
            res['serie'][i]['fecha'] = datetime.datetime.fromisoformat(item['fecha'].replace('T', ' ').replace('Z', ''))\
                .strftime('%Y-%m-%d')
        return res

    def historical(self, indicador: str, since: str = None):
        sub = indicador
        if since is not None:
            sub = '/'.join([sub, since])
        url = self.__build_url(sub)
        res = self.__get(url)
        for i, item in enumerate(res['serie']):
            res['serie'][i]['fecha'] = datetime.datetime.fromisoformat(item['fecha'].replace('T', ' ').replace('Z', ''))\
                .strftime('%Y-%m-%d')
        return res


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('-u', '--url')
    parser.add_argument('-i', '--indicador')
    hist = parser.add_subparsers()
    hparser = hist.add_parser('hist')
    hparser.add_argument('-hi', '--historical', action='store_true')
    hparser.add_argument('-s', '--since')
    args = parser.parse_args()
    mi = MiIndicador(args.url)
    if 'historical' in args and args.historical:
        print(mi.historical(args.indicador, args.since))
        exit()
    print(mi.get(args.indicador))