#!/usr/bin/env python3

# Copyright 2020 University Of Delhi.
#
# 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.


"""
Server
"""


import logging
import subprocess

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


# pylint: disable=W0223

class SwPostStateValidator(tornado.web.RequestHandler):
    """
    Post Cloud Software Deployment State Validation Tool REST Request Handler
    """

    # def set_default_headers(self):
    #     """
    #     """
    #     self.set_header('Content-Type', 'application/json')


    def get(self):
        """
        get request

        usage:
            option 1: passing parameters as key=value list
                /?params='KEY1=value1,KEY2=value2'

            option 2: passing parameters in conf-file
                /?config=filename

        :return: logs from test results
        """
        conf_params = self.get_argument('params', None)
        if conf_params is not None:
            conf_params = conf_params.replace(',', ';')
        conf_file = self.get_argument('config', None)
        pdf_file = self.get_argument('pdf', None)

        cmd = ['python3', '/state/state']

        if conf_params is not None:
            cmd.extend(['--conf-params', f'{conf_params}'])

        if conf_file is not None:
            cmd.extend(['--conf-file', f'/data/{conf_file}'])

        if pdf_file is not None:
            cmd.extend(['--pdf-file', f'/data/{pdf_file}'])


        logger = logging.getLogger(__name__)
        command = " ".join(cmd)
        logger.info(f'# Executing: [ {command} ]')


        process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
        output = process.communicate()[0]
        returncode = process.returncode

        if returncode == 0:
            results = output
        else:
            results = {'error': 'failed to retrieve results'}

        self.finish(results)



class UploadHandler(tornado.web.RequestHandler):
    """
    Upload File
    """

    def post(self):
        """
        post request

        usage:

            /upload
            pass a file in `file` variable in header
        """
        data = self.request.files['file'][0]
        fname = data['filename']

        with open("/data/" + fname, 'wb+') as ofile:
            ofile.write(data['body'])

        self.finish("{upload : ok}")



def server_main_block():
    """
    Main Function
    """

    app = Application([('/', SwPostStateValidator),
                       ('/upload', UploadHandler)])

    # Cli Config
    tornado.options.define("port", default=80, help="run 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("# Servering.... \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__":
    server_main_block()