import io
from time import sleep

import pandas as pd

from core.enums import SIGRefType
from data.sig_ref import SIGRef
from providers.sigrefdata.file_download_sig_ref_data_provider import FileDownloadSIGRefDataProvider


class DCE(FileDownloadSIGRefDataProvider):
    """SIG ref data provider for Diploma Castillos de España"""

    POLL_INTERVAL_DAYS = 365
    SIG = "DCE"
    DATA_URL = "https://www.acracb.org/dce/descargas/General/directorio_referencias_dce.xls"

    def __init__(self, provider_config):
        super().__init__(self.SIG, provider_config, self.DATA_URL, self.POLL_INTERVAL_DAYS)

    def _http_response_to_data(self, http_response):
        new_data = []

        file_stream = io.BytesIO(http_response.content)
        df = pd.read_excel(file_stream, engine="xlrd", header=None)

        for index, row in df.iterrows():
            if row.iloc[0] and row.iloc[2]:
                new_data.append(
                    SIGRef(sig=self.SIG, id=row.iloc[0].strip(), name=row.iloc[2].strip(), ref_type=SIGRefType.CASTLE)
                )

            # Bail out if a stop has been requested, i.e. the program is shutting down - no need to parse the rest of
            # the data in this case
            if self._stop_event.is_set():
                break

            # Very short pause. This will extend the time to handle sig refs by a few seconds but will ensure some time
            # is available for other threads e.g. the web server.
            sleep(0.001)

        return new_data