# Copyright 2021 The KServe Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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 io
import os
import tempfile
import binascii
import unittest.mock as mock
import mimetypes
from pathlib import Path

import botocore
import pytest

from kserve.storage import Storage

STORAGE_MODULE = 'kserve.storage.storage'
HTTPS_URI_TARGZ = 'https://foo.bar/model.tar.gz'
HTTPS_URI_TARGZ_WITH_QUERY = HTTPS_URI_TARGZ + '?foo=bar'

# *.tar.gz contains a single empty file model.pth
FILE_TAR_GZ_RAW = binascii.unhexlify('1f8b0800bac550600003cbcd4f49cdd12b28c960a01d3030303033315100d1e666a660dac008c28'
                                     '701054313a090a189919981998281a1b1b1a1118382010ddd0407a5c525894540a754656466e464e'
                                     '2560754969686c71ca83fe0f4281805a360140c7200009f7e1bb400060000')
# *.zip contains a single empty file model.pth
FILE_ZIP_RAW = binascii.unhexlify('504b030414000800080035b67052000000000000000000000000090020006d6f64656c2e70746855540'
                                  'd000786c5506086c5506086c5506075780b000104f501000004140000000300504b07080000000002000'
                                  '00000000000504b0102140314000800080035b6705200000000020000000000000009002000000000000'
                                  '0000000a481000000006d6f64656c2e70746855540d000786c5506086c5506086c5506075780b000104f'
                                  '50100000414000000504b0506000000000100010057000000590000000000')


def test_storage_local_path():
    abs_path = 'file:///'
    relative_path = 'file://.'
    assert Storage.download(abs_path) == abs_path.replace("file://", "", 1)
    assert Storage.download(relative_path) == relative_path.replace("file://", "", 1)


def test_storage_local_path_exception():
    not_exist_path = 'file:///some/random/path'
    with pytest.raises(Exception):
        Storage.download(not_exist_path)


def test_no_prefix_local_path():
    abs_path = '/'
    relative_path = '.'
    assert Storage.download(abs_path) == abs_path
    assert Storage.download(relative_path) == relative_path


class MockHttpResponse(object):
    def __init__(
        self,
        status_code=404,
        raw=b'',
        content_type=''
    ):
        self.status_code = status_code
        self.raw = io.BytesIO(raw)
        self.headers = {'Content-Type': content_type}

    def __enter__(self):
        return self

    def __exit__(self, ex_type, ex_val, traceback):
        pass


@mock.patch('requests.get', return_value=MockHttpResponse(status_code=200, content_type='application/octet-stream'))
def test_http_uri_path(_):
    http_uri = 'http://foo.bar/model.joblib'
    http_with_query_uri = 'http://foo.bar/model.joblib?foo=bar'
    out_dir = '.'
    assert Storage.download(http_uri, out_dir=out_dir) == out_dir
    assert Storage.download(http_with_query_uri, out_dir=out_dir) == out_dir
    os.remove('./model.joblib')


@mock.patch('requests.get', return_value=MockHttpResponse(status_code=200, content_type='application/octet-stream'))
def test_https_uri_path(_):
    https_uri = 'https://foo.bar/model.joblib'
    https_with_query_uri = 'https://foo.bar/model.joblib?foo=bar'
    out_dir = '.'
    assert Storage.download(https_uri, out_dir=out_dir) == out_dir
    assert Storage.download(https_with_query_uri, out_dir=out_dir) == out_dir
    os.remove('./model.joblib')


http_uri_path_testparams = [
    (HTTPS_URI_TARGZ, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/x-tar'), None),
    (HTTPS_URI_TARGZ, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/x-gtar'), None),
    (HTTPS_URI_TARGZ, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/x-gzip'), None),
    (HTTPS_URI_TARGZ, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/gzip'), None),
    (HTTPS_URI_TARGZ, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/zip'), RuntimeError),
    (HTTPS_URI_TARGZ_WITH_QUERY, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/x-tar'), None),
    (HTTPS_URI_TARGZ_WITH_QUERY, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/x-gtar'), None),
    (HTTPS_URI_TARGZ_WITH_QUERY, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/x-gzip'), None),
    (HTTPS_URI_TARGZ_WITH_QUERY, MockHttpResponse(200, FILE_TAR_GZ_RAW, 'application/gzip'), None),
    ('https://foo.bar/model.zip', MockHttpResponse(200, FILE_ZIP_RAW, 'application/zip'), None),
    ('https://foo.bar/model.zip', MockHttpResponse(200, FILE_ZIP_RAW, 'application/x-zip-compressed'), None),
    ('https://foo.bar/model.zip', MockHttpResponse(200, FILE_ZIP_RAW, 'application/zip-compressed'), None),
    ('https://foo.bar/model.zip?foo=bar', MockHttpResponse(200, FILE_ZIP_RAW, 'application/zip'), None),
    ('https://foo.bar/model.zip?foo=bar', MockHttpResponse(200, FILE_ZIP_RAW, 'application/x-zip-compressed'), None),
    ('https://foo.bar/model.zip?foo=bar', MockHttpResponse(200, FILE_ZIP_RAW, 'application/zip-compressed'), None),
    ('https://theabyss.net/model.joblib', MockHttpResponse(404), RuntimeError),
    ('https://some.site.com/test.model', MockHttpResponse(status_code=200, content_type='text/html'), RuntimeError),
    ('https://foo.bar/test/', MockHttpResponse(200), ValueError),
    ('https://foo.bar/download?path=/20210530/model.zip', MockHttpResponse(200, FILE_ZIP_RAW, 'application/zip'), None),
    ('https://foo.bar/download?path=/20210530/model.zip', MockHttpResponse(200, FILE_ZIP_RAW, 'application/x-zip'
                                                                                              '-compressed'), None),
    ('https://foo.bar/download?path=/20210530/model.zip', MockHttpResponse(200, FILE_ZIP_RAW, 'application/zip'
                                                                                              '-compressed'), None),
]


@pytest.mark.parametrize('uri,response,expected_error', http_uri_path_testparams)
def test_http_uri_paths(uri, response, expected_error):
    if expected_error:
        def test(_):
            with pytest.raises(expected_error):
                Storage.download(uri)
    else:
        def test(_):
            with tempfile.TemporaryDirectory() as out_dir:
                assert Storage.download(uri, out_dir=out_dir) == out_dir
                assert os.path.exists(os.path.join(out_dir, 'model.pth'))
    mock.patch('requests.get', return_value=response)(test)()


@mock.patch(STORAGE_MODULE + '.storage')
def test_mock_gcs(mock_storage):
    gcs_path = 'gs://foo/bar'
    mock_obj = mock.MagicMock()
    mock_obj.name = 'mock.object'
    mock_storage.Client().bucket().list_blobs().__iter__.return_value = [mock_obj]
    assert Storage.download(gcs_path)


def test_storage_blob_exception():
    blob_path = 'https://accountname.blob.core.windows.net/container/some/blob/'
    with pytest.raises(Exception):
        Storage.download(blob_path)


@mock.patch(STORAGE_MODULE + '.boto3')
def test_storage_s3_exception(mock_boto3):
    path = 's3://foo/bar'
    # Create mock client
    mock_s3_resource = mock.MagicMock()
    mock_s3_resource.Bucket.side_effect = Exception()
    mock_boto3.resource.return_value = mock_s3_resource

    with pytest.raises(Exception):
        Storage.download(path)


@mock.patch(STORAGE_MODULE + '.boto3')
@mock.patch('urllib3.PoolManager')
def test_no_permission_buckets(mock_connection, mock_boto3):
    bad_s3_path = "s3://random/path"
    # Access private buckets without credentials
    mock_s3_resource = mock.MagicMock()
    mock_s3_bucket = mock.MagicMock()
    mock_s3_bucket.objects.filter.return_value = [mock.MagicMock()]
    mock_s3_bucket.objects.filter.side_effect = botocore.exceptions.ClientError(
        {}, "GetObject"
    )
    mock_s3_resource.Bucket.return_value = mock_s3_bucket
    mock_boto3.resource.return_value = mock_s3_resource

    with pytest.raises(botocore.exceptions.ClientError):
        Storage.download(bad_s3_path)


def test_unpack_tar_file():
    out_dir = '.'
    tar_file = os.path.join(out_dir, "model.tgz")
    Path(tar_file).write_bytes(FILE_TAR_GZ_RAW)
    mimetype, _ = mimetypes.guess_type(tar_file)
    Storage._unpack_archive_file(tar_file, mimetype, out_dir)
    assert os.path.exists(os.path.join(out_dir, 'model.pth'))
    os.remove(os.path.join(out_dir, 'model.pth'))


def test_unpack_zip_file():
    out_dir = '.'
    tar_file = os.path.join(out_dir, "model.zip")
    Path(tar_file).write_bytes(FILE_ZIP_RAW)
    mimetype, _ = mimetypes.guess_type(tar_file)
    Storage._unpack_archive_file(tar_file, mimetype, out_dir)
    assert os.path.exists(os.path.join(out_dir, 'model.pth'))
    os.remove(os.path.join(out_dir, 'model.pth'))
