# Copyright 2019-2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
#     http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
from __future__ import absolute_import

import os

import boto3
import botocore

RESOURCE_PATH = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "resources"))

# EI is currently only supported in the following regions
# regions were derived from https://aws.amazon.com/machine-learning/elastic-inference/pricing/
EI_SUPPORTED_REGIONS = [
    "us-east-1",
    "us-east-2",
    "us-west-2",
    "eu-west-1",
    "ap-northeast-1",
    "ap-northeast-2",
]

# These regions have some p2 and p3 instances, but not enough for automated testing
NO_P2_REGIONS = [
    "ca-central-1",
    "eu-central-1",
    "eu-west-2",
    "us-west-1",
    "eu-west-3",
    "eu-north-1",
    "sa-east-1",
    "ap-east-1",
    "me-south-1",
    "cn-northwest-1",
    "eu-south-1",
    "af-south-1",
    "ap-northeast-3",
    "il-central-1",
]
NO_P3_REGIONS = [
    "ap-northeast-1",
    "ap-northeast-2",
    "ap-northeast-3",
    "ap-southeast-1",
    "ap-southeast-2",
    "ap-south-1",
    "ca-central-1",
    "eu-central-1",
    "eu-west-2",
    "us-west-1",
    "eu-west-3",
    "eu-north-1",
    "sa-east-1",
    "ap-east-1",
    "me-south-1",
    "cn-northwest-1",
    "eu-south-1",
    "af-south-1",
    "il-central-1",
]
NO_P4_REGIONS = [
    "ap-northeast-3",
    "ap-southeast-1",
    "ap-southeast-2",
    "ap-south-1",
    "ca-central-1",
    "eu-central-1",
    "eu-west-2",
    "us-west-1",
    "eu-west-3",
    "eu-north-1",
    "sa-east-1",
    "ap-east-1",
    "me-south-1",
    "cn-northwest-1",
    "eu-south-1",
    "af-south-1",
    "il-central-1",
]


def _botocore_resolver():
    """
    Get the DNS suffix for the given region.
    :return: endpoint object
    """
    loader = botocore.loaders.create_loader()
    return botocore.regions.EndpointResolver(loader.load_data("endpoints"))


def get_ecr_registry(account, region):
    """
    Get prefix of ECR image URI
    :param account: Account ID
    :param region: region where ECR repo exists
    :return: AWS ECR registry
    """
    endpoint_data = _botocore_resolver().construct_endpoint("ecr", region)
    return "{}.dkr.{}".format(account, endpoint_data["hostname"])