"""Grass model."""

from oto import response
from owsrequest import request as ows
import requests

from auth import config


GET = 'GET'
POST = 'POST'
PUT = 'PUT'
HEAD = 'HEAD'
DELETE = 'DELETE'


_request = {
    GET: requests.get,
    POST: requests.post,
    PUT: requests.put,
    HEAD: requests.head,
    DELETE: requests.delete
}

INVALID_VERB = 'Requests must be made with a valid verb'
INVALID_RESOURCE = 'The resource must start with a "/"'


def request(verb, resource, params=None, data=None, headers=None):
    """Make a request to a microservice.

    Args:
        verb (str): the http verb for the request.
        resource (str): the resource to use.
        params (dict): params for the request.
        data (dict): body of the request.
        headers (dict): optional headers.

    Raises:
        AssertionError: if the verb is invalid of if the resource does not
            start with a /.

    Returns:
        response.Response: the response of the request.
    """
    assert verb in _request, INVALID_VERB
    assert resource.startswith('/'), INVALID_RESOURCE

    url = ows.URL.format(domain=config.GRASS_DOMAIN, path=resource)
    result = _request.get(verb)(url, params=params, data=data, headers=headers)
    content = result.text

    try:
        content = result.json()
    except:
        pass

    if 200 <= result.status_code < 300:
        return response.Response(
            message=content, status=result.status_code)
    return response.Response(
        errors=content, status=result.status_code)