# Copyright 2020 Spirent Communications.
#
# 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.

"""
Airship implementation of Software Predeployment Validation
"""

import os
import shutil
from pathlib import Path
import logging
import json
import git
import urllib3

from tornado.web import Application
from tornado.ioloop import IOLoop
import tornado.concurrent
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import tornado.log


def check_link(link):
    """
    Function the check the availability of Hyperlinks
    """
    timeout = urllib3.util.Timeout(connect=5.0, read=7.0)
    http = urllib3.PoolManager(timeout=timeout)
    try:
        http.request('HEAD', link)
    except urllib3.exceptions.LocationValueError as err:
        print(err.args)
        return False
    except urllib3.exceptions.MaxRetryError as err:
        print(err.args)
        return False
    except urllib3.exceptions.RequestError as err:
        print(err.args)
        return False
    except urllib3.exceptions.ConnectTimeoutError as err:
        print(err.args)
        return False
    except urllib3.exceptions.PoolError as err:
        print(err.args)
        return False
    except urllib3.exceptions.HTTPError as err:
        print(err.args)
        return False
    return True


class Airship():
    """
    Ariship URLS Validation
    """
    def __init__(self, params):
        """ Airship class constructor """
        self.url = params['AIRSHIP_MANIFEST_URL']
        self.branch = params['AIRSHIP_MANIFEST_BRANCH']
        self.dl_path = '/tmp'
        self.site_name = params['AIRSHIP_MANIFEST_SITE_NAME']
        self.tmversion = params['AIRSHIP_TREASUREMAP_VERSION']
        self.manifest = None
        self.dirpath = Path(self.dl_path, 'airship')
        self.tmdirpath = Path(self.dl_path, 'treasuremap')
        self.locations = []
        self.validcount = 0
        self.invalidcount = 0
        self.respath = os.path.join(self.dl_path, ('urls-' +
                                                   self.site_name +
                                                   '-check.txt'))

    def clone_repo(self):
        """
        Cloning the repos
        """
        git.Repo.clone_from(self.url,
                            self.dirpath,
                            branch=self.branch)
        git.Repo.clone_from('https://github.com/airshipit/treasuremap',
                            self.tmdirpath,
                            branch=self.tmversion)

    def cleanup_manifest(self):
        """
        Remove existing manifests
        """
        # Next Remove any manifest files, if it exists
        if self.dirpath.exists() and self.dirpath.is_dir():
            shutil.rmtree(self.dirpath)
        if self.tmdirpath.exists() and self.tmdirpath.is_dir():
            shutil.rmtree(self.tmdirpath)

    def manifest_exists_locally(self):
        """
        Check if manifests exists locally
        """
        if self.dirpath.exists() and self.dirpath.is_dir():
            return True
        return False

    def validate(self):
        """
        Hyperlink Validation
        """
        self.cleanup_manifest()
        # Next, clone the repo to the provided path.
        self.clone_repo()

        if self.dirpath.exists() and self.dirpath.is_dir():
            # Get the file(s) where links are defined.
            self.find_locations(
                os.path.join(self.dirpath, 'type',
                             'cntt', 'software',
                             'config', 'versions.yaml'))
            self.find_locations(
                os.path.join(self.tmdirpath, 'global',
                             'software', 'config', 'versions.yaml'))

            with open(self.respath, "w+") as report:
                for location in self.locations:
                    if check_link(location):
                        report.write("The Link: %s is VALID" % (location))
                        self.validcount += 1
                    else:
                        self.invalidcount += 1
                        report.write("The Link: %s is INVALID" % (location))
        self.cleanup_manifest()

    def getresults(self):
        """
        Return Valid and Invalid Counts
        """
        return(self.validcount, self.invalidcount)

    # pylint: disable=consider-using-enumerate
    def find_locations(self, yamlfile):
        """
        Find all the hyperlinks in the manifests
        """
        with open(yamlfile, 'r') as filep:
            lines = filep.readlines()
            for index in range(len(lines)):
                line = lines[index].strip()
                if line.startswith('location:'):
                    link = line.split(":", 1)[1]
                    if "opendev" in link:
                        if ((len(lines) > index+1) and
                                (lines[index+1].strip().startswith(
                                    'reference:'))):
                            ref = lines[index+1].split(":", 1)[1]
                            link = link + '/commit/' + ref.strip()
                    if link.strip() not in self.locations:
                        print(link)
                        self.locations.append(link.strip())
                if 'docker.' in line:
                    link = line.split(":", 1)[1]
                    link = link.replace('"', '')
                    parts = link.split('/')
                    if len(parts) == 3:
                        link = ('https://index.' +
                                parts[0].strip() +
                                '/v1/repositories/' +
                                parts[1] + '/' + parts[2].split(':')[0] +
                                '/tags/' + parts[2].split(':')[-1])
                        if link.strip() not in self.locations:
                            print(link)
                            self.locations.append(link.strip())
                #  quay.io/coreos/etcd:v3.4.2
                # https://quay.io/api/v1/repository/coreos/etcd/tag/v3.4.2
                if 'quay.' in line:
                    link = line.split(":", 1)[1]
                    link = link.replace('"', '')
                    parts = link.split('/')
                    if len(parts) == 3:
                        link = ('https://' +
                                parts[0].strip() +
                                '/api/v1/repository/' +
                                parts[1] + '/' + parts[2].split(':')[0] +
                                '/tag/' + parts[2].split(':')[-1])
                        if link.strip() not in self.locations:
                            print(link)
                            self.locations.append(link.strip())


# pylint: disable=W0223
class AirshipUrlsValidator(tornado.web.RequestHandler):
    """ Validate URLS """
    def set_default_headers(self):
        """ set default headers"""
        self.set_header('Content-Type', 'application/json')

    def post(self):
        """
        POST request
        usage:
            /airship/?name='' installer='' link='' version=''
        :return: logs from test results
        """
        # decode the body
        data = json.loads(self.request.body.decode())
        params = {}
        branch = 'master'
        installer = data['installer']
        name = data['name']
        link = data['link']
        version = data['version']
        if installer and 'airship' in installer.lower():
            if name and link and branch and version:
                params['AIRSHIP_MANIFEST_URL'] = link
                params['AIRSHIP_MANIFEST_BRANCH'] = branch
                params['AIRSHIP_MANIFEST_SITE_NAME'] = name
                params['AIRSHIP_TREASUREMAP_VERSION'] = version
                airship = Airship(params)
                airship.validate()
                valid, invalid = airship.getresults()
                self.write("Valid Links: " +
                           str(valid) +
                           "  Invalid Links: " +
                           str(invalid))


# pylint: disable=W0223
class TripleoUrlsValidator(tornado.web.RequestHandler):
    """ Validate URLS """

    def post(self):
        """
        POST request
        """
        self.write('error: Not Implemented')


def main():
    """ The Main Control """
    app = Application([('/airship', AirshipUrlsValidator),
                       ('/tripleo', TripleoUrlsValidator)])

    # Cli Config
    tornado.options.define("port", default=8989,
                           help="running on the given port", type=int)
    tornado.options.parse_command_line()

    # Server Config
    http_server = tornado.httpserver.HTTPServer(app)
    http_server.listen(tornado.options.options.port)

    # Tornado's event loop handles it from here
    print("# Server Listening.... \n [Ctrl + C] to quit")

    # Logging
    log_file_filename = "/var/log/tornado.log"
    handler = logging.FileHandler(log_file_filename)
    app_log = logging.getLogger("tornado.general")
    tornado.log.enable_pretty_logging()
    app_log.addHandler(handler)

    try:
        tornado.ioloop.IOLoop.instance().start()
    except KeyboardInterrupt:
        tornado.ioloop.IOLoop.instance().stop()

    # start
    IOLoop.instance().start()

if __name__ == "__main__":
    main()