# -*- coding: utf-8 -*-
"""OpenAPI core operations module"""
import logging

from six import iteritems

from openapi_core.parameters import ParametersGenerator
from openapi_core.request_bodies import RequestBodyFactory

log = logging.getLogger(__name__)


class Operation(object):
    """Represents an OpenAPI Operation."""

    def __init__(
            self, http_method, path_name, parameters, request_body=None,
            deprecated=False, operation_id=None):
        self.http_method = http_method
        self.path_name = path_name
        self.parameters = dict(parameters)
        self.request_body = request_body
        self.deprecated = deprecated
        self.operation_id = operation_id

    def __getitem__(self, name):
        return self.parameters[name]


class OperationsGenerator(object):
    """Represents an OpenAPI Operation in a service."""

    def __init__(self, dereferencer):
        self.dereferencer = dereferencer

    def generate(self, path_name, path):
        path_deref = self.dereferencer.dereference(path)
        for http_method, operation in iteritems(path_deref):
            if http_method.startswith('x-') or http_method == 'parameters':
                continue

            operation_deref = self.dereferencer.dereference(operation)
            deprecated = operation_deref.get('deprecated', False)
            parameters_list = operation_deref.get('parameters', [])
            parameters = self._generate_parameters(parameters_list)

            request_body = None
            if 'requestBody' in operation_deref:
                request_body_spec = operation_deref.get('requestBody')
                request_body = self._create_request_body(request_body_spec)

            yield (
                http_method,
                Operation(
                    http_method, path_name, list(parameters),
                    request_body=request_body, deprecated=deprecated,
                ),
            )

    def _generate_parameters(self, parameters):
        return ParametersGenerator(self.dereferencer).generate(parameters)

    def _create_request_body(self, request_body_spec):
        return RequestBodyFactory(self.dereferencer).create(request_body_spec)