"""An interface to ows-charts microservice."""

from oto import response
from owsrequest import request

from . import config


OWS_CHARTS_ERROR = 'OWS_CHARTS_ERROR'


def prime_chart_dates(chart_dates):
    """Request cache invalidation and priming for a selection of chart dates.

    Args:
        chart_dates (list): A list of chart_id and chart_date pairs.

    Returns:
        oto.Response: a response containing an ok message or an error
    """
    ows_charts_response = request.process(
        application=config.feed_name,
        environment=config.environment,
        method='POST',
        service_name='ows-charts',
        path='/charts/prime',
        json={
            'chart_dates': chart_dates,
        }
    )

    if ows_charts_response.status_code == 200:
        return response.Response(ows_charts_response.json())

    try:
        response_errors = ows_charts_response.json()
    except (TypeError, ValueError):
        response_errors = ows_charts_response.content.decode('utf-8')

    return response.create_error_response(
        code=OWS_CHARTS_ERROR,
        message=response_errors,
        status=ows_charts_response.status_code,
    )