# 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.

import os
import shutil
import subprocess
import sys
import time

import pytest

import requests


PING_URL = "http://localhost:8080/ping"
INVOCATIONS_URL = "http://localhost:8080/invocations"


@pytest.fixture(scope="module", autouse=True, params=["1", "2", "3", "4", "5"])
def volume(tmpdir_factory, request):
    try:
        print(str(tmpdir_factory))
        model_dir = os.path.join(tmpdir_factory.mktemp("test"), "model")
        code_dir = os.path.join(model_dir, "code")
        test_example = "test/resources/examples/test{}".format(request.param)

        model_src_dir = "test/resources/models"
        shutil.copytree(model_src_dir, model_dir)
        shutil.copytree(test_example, code_dir)

        volume_name = f"model_volume_{request.param}"
        subprocess.check_call(
            "docker volume create --name {} --opt type=none "
            "--opt device={} --opt o=bind".format(volume_name, model_dir).split())
        yield volume_name
    finally:
        subprocess.check_call(f"docker volume rm {volume_name}".split())


@pytest.fixture(scope="module", autouse=True)
def container(volume, docker_base_name, tag, runtime_config):
    try:
        command = (
            "docker run {}--name sagemaker-tensorflow-serving-test -p 8080:8080"
            " --mount type=volume,source={},target=/opt/ml/model,readonly"
            " -e SAGEMAKER_TFS_NGINX_LOGLEVEL=info"
            " -e SAGEMAKER_BIND_TO_PORT=8080"
            " -e SAGEMAKER_SAFE_PORT_RANGE=9000-9999"
            " {}:{} serve"
        ).format(runtime_config, volume, docker_base_name, tag)

        proc = subprocess.Popen(command.split(), stdout=sys.stdout, stderr=subprocess.STDOUT)

        attempts = 0
        while attempts < 40:
            time.sleep(3)
            try:
                res_code = requests.get("http://localhost:8080/ping").status_code
                if res_code == 200:
                    break
            except:
                attempts += 1
                pass

        yield proc.pid
    finally:
        subprocess.check_call("docker rm -f sagemaker-tensorflow-serving-test".split())


def make_headers(content_type, method, version=None):
    custom_attributes = "tfs-model-name=half_plus_three,tfs-method={}".format(method)
    if version:
        custom_attributes += ",tfs-model-version={}".format(version)

    return {
        "Content-Type": content_type,
        "X-Amzn-SageMaker-Custom-Attributes": custom_attributes,
    }


def test_predict_json():
    headers = make_headers("application/json", "predict")
    data = "{\"instances\": [1.0, 2.0, 5.0]}"
    response = requests.post(INVOCATIONS_URL, data=data, headers=headers).json()
    assert response == {"predictions": [3.5, 4.0, 5.5]}


def test_zero_content():
    headers = make_headers("application/json", "predict")
    data = ""
    response = requests.post(INVOCATIONS_URL, data=data, headers=headers)
    assert 500 == response.status_code
    assert "document is empty" in response.text


def test_large_input():
    headers = make_headers("text/csv", "predict")
    data_file = "test/resources/inputs/test-large.csv"

    with open(data_file, "r") as file:
        large_data = file.read()
        response = requests.post(INVOCATIONS_URL, data=large_data, headers=headers).json()
        predictions = response["predictions"]
        assert len(predictions) == 753936


def test_csv_input():
    headers = make_headers("text/csv", "predict")
    data = "1.0,2.0,5.0"
    response = requests.post(INVOCATIONS_URL, data=data, headers=headers).json()
    assert response == {"predictions": [3.5, 4.0, 5.5]}


def test_predict_specific_versions():
    for version in ("123", "124"):
        headers = make_headers("application/json", "predict", version=version)
        data = "{\"instances\": [1.0, 2.0, 5.0]}"
        response = requests.post(INVOCATIONS_URL, data=data, headers=headers).json()
        assert response == {"predictions": [3.5, 4.0, 5.5]}


def test_unsupported_content_type():
    headers = make_headers("unsupported-type", "predict")
    data = "aW1hZ2UgYnl0ZXM="
    response = requests.post(INVOCATIONS_URL, data=data, headers=headers)
    assert 500 == response.status_code
    assert "unsupported content type" in response.text


def test_ping_service():
    response = requests.get(PING_URL)
    assert 200 == response.status_code