# Copyright 2014 Microsoft Corporation
#
# 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.
#
# Requires Python 2.4+ and Openssl 1.0+
#

from tests.tools import *
from azurelinuxagent.common.exception import HttpError, ResourceGoneError
from azurelinuxagent.common.future import httpclient
from azurelinuxagent.common.utils.cryptutil import CryptUtil

DATA_FILE = {
        "version_info": "wire/version_info.xml",
        "goal_state": "wire/goal_state.xml",
        "hosting_env": "wire/hosting_env.xml",
        "shared_config": "wire/shared_config.xml",
        "certs": "wire/certs.xml",
        "ext_conf": "wire/ext_conf.xml",
        "manifest": "wire/manifest.xml",
        "ga_manifest" : "wire/ga_manifest.xml",
        "trans_prv": "wire/trans_prv",
        "trans_cert": "wire/trans_cert",
        "test_ext": "ext/sample_ext-1.3.0.zip"
}

DATA_FILE_NO_EXT = DATA_FILE.copy()
DATA_FILE_NO_EXT["goal_state"] = "wire/goal_state_no_ext.xml"

DATA_FILE_EXT_NO_SETTINGS = DATA_FILE.copy()
DATA_FILE_EXT_NO_SETTINGS["ext_conf"] = "wire/ext_conf_no_settings.xml"

DATA_FILE_EXT_NO_PUBLIC = DATA_FILE.copy()
DATA_FILE_EXT_NO_PUBLIC["ext_conf"] = "wire/ext_conf_no_public.xml"

DATA_FILE_EXT_AUTOUPGRADE = DATA_FILE.copy()
DATA_FILE_EXT_AUTOUPGRADE["ext_conf"] = "wire/ext_conf_autoupgrade.xml"

DATA_FILE_EXT_INTERNALVERSION = DATA_FILE.copy()
DATA_FILE_EXT_INTERNALVERSION["ext_conf"] = "wire/ext_conf_internalversion.xml"

DATA_FILE_EXT_AUTOUPGRADE_INTERNALVERSION = DATA_FILE.copy()
DATA_FILE_EXT_AUTOUPGRADE_INTERNALVERSION["ext_conf"] = "wire/ext_conf_autoupgrade_internalversion.xml"

DATA_FILE_EXT_ROLLINGUPGRADE = DATA_FILE.copy()
DATA_FILE_EXT_ROLLINGUPGRADE["ext_conf"] = "wire/ext_conf_upgradeguid.xml"

class WireProtocolData(object):
    def __init__(self, data_files=DATA_FILE):
        self.emulate_stale_goal_state = False
        self.call_counts = {
            "comp=versions" : 0,
            "/versions" : 0,
            "goalstate" : 0,
            "hostingenvuri" : 0,
            "sharedconfiguri" : 0,
            "certificatesuri" : 0,
            "extensionsconfiguri" : 0,
            "extensionArtifact" : 0,
            "manifest.xml" : 0,
            "manifest_of_ga.xml" : 0,
            "ExampleHandlerLinux" : 0
        }
        self.version_info = load_data(data_files.get("version_info"))
        self.goal_state = load_data(data_files.get("goal_state"))
        self.hosting_env = load_data(data_files.get("hosting_env"))
        self.shared_config = load_data(data_files.get("shared_config"))
        self.certs = load_data(data_files.get("certs"))
        self.ext_conf = load_data(data_files.get("ext_conf"))
        self.manifest = load_data(data_files.get("manifest"))
        self.ga_manifest = load_data(data_files.get("ga_manifest"))
        self.trans_prv = load_data(data_files.get("trans_prv"))
        self.trans_cert = load_data(data_files.get("trans_cert"))
        self.ext = load_bin_data(data_files.get("test_ext"))

    def mock_http_get(self, url, *args, **kwargs):
        content = None

        resp = MagicMock()
        resp.status = httpclient.OK

        # wire server versions
        if "comp=versions" in url:
            content = self.version_info
            self.call_counts["comp=versions"] += 1

        # HostPlugin versions
        elif "/versions" in url:
            content = '["2015-09-01"]'
            self.call_counts["/versions"] += 1
        elif "goalstate" in url:
            content = self.goal_state
            self.call_counts["goalstate"] += 1
        elif "hostingenvuri" in url:
            content = self.hosting_env
            self.call_counts["hostingenvuri"] += 1
        elif "sharedconfiguri" in url:
            content = self.shared_config
            self.call_counts["sharedconfiguri"] += 1
        elif "certificatesuri" in url:
            content = self.certs
            self.call_counts["certificatesuri"] += 1
        elif "extensionsconfiguri" in url:
            content = self.ext_conf
            self.call_counts["extensionsconfiguri"] += 1

        else:
            # A stale GoalState results in a 400 from the HostPlugin
            # for which the HTTP handler in restutil raises ResourceGoneError
            if self.emulate_stale_goal_state:
                if "extensionArtifact" in url:
                    self.emulate_stale_goal_state = False
                    self.call_counts["extensionArtifact"] += 1
                    raise ResourceGoneError()
                else:
                    raise HttpError()

            # For HostPlugin requests, replace the URL with that passed
            # via the x-ms-artifact-location header
            if "extensionArtifact" in url:
                self.call_counts["extensionArtifact"] += 1
                if "headers" not in kwargs or \
                    "x-ms-artifact-location" not in kwargs["headers"]:
                    raise Exception("Bad HEADERS passed to HostPlugin: {0}",
                            kwargs)
                url = kwargs["headers"]["x-ms-artifact-location"]

            if "manifest.xml" in url:
                content = self.manifest
                self.call_counts["manifest.xml"] += 1
            elif "manifest_of_ga.xml" in url:
                content = self.ga_manifest
                self.call_counts["manifest_of_ga.xml"] += 1
            elif "ExampleHandlerLinux" in url:
                content = self.ext
                self.call_counts["ExampleHandlerLinux"] += 1
                resp.read = Mock(return_value=content)
                return resp
            else:
                raise Exception("Bad url {0}".format(url))

        resp.read = Mock(return_value=content.encode("utf-8"))
        return resp

    def mock_crypt_util(self, *args, **kw):
        #Partially patch instance method of class CryptUtil
        cryptutil = CryptUtil(*args, **kw)
        cryptutil.gen_transport_cert = Mock(side_effect=self.mock_gen_trans_cert)
        return cryptutil
    
    def mock_gen_trans_cert(self, trans_prv_file, trans_cert_file):
        with open(trans_prv_file, 'w+') as prv_file:
            prv_file.write(self.trans_prv)

        with open(trans_cert_file, 'w+') as cert_file:
            cert_file.write(self.trans_cert)

