'''
    Onionr - Private P2P Communication

    This module does the second part of the bootstrap block handshake and creates the API server
'''
'''
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
'''
from gevent.pywsgi import WSGIServer
from stem.control import Controller
from flask import Flask
import core, logger, httpapi
import onionrexceptions
from netcontroller import getOpenPort
from httpapi import apiutils
from onionrutils import stringvalidators, basicrequests, bytesconverter
from . import httpheaders

class ConnectionServer:
    def __init__(self, peer, address, core_inst=None):
        if core_inst is None:
            self.core_inst = core.Core()
        else:
            self.core_inst = core_inst

        if not stringvalidators.validate_pub_key(peer):
            raise ValueError('Peer must be valid base32 ed25519 public key')
        
        socks = core_inst.config.get('tor.socksport') # Load config for Tor socks port for proxy
        service_app = Flask(__name__) # Setup Flask app for server.
        service_port = getOpenPort()
        service_ip = apiutils.setbindip.set_bind_IP(core_inst=self.core_inst)
        http_server = WSGIServer(('127.0.0.1', service_port), service_app, log=None)
        core_inst.onionrInst.communicatorInst.service_greenlets.append(http_server)

        # TODO define basic endpoints useful for direct connections like stats
        
        httpapi.load_plugin_blueprints(service_app, blueprint='direct_blueprint')

        @service_app.route('/ping')
        def get_ping():
            return "pong!"
        
        @service_app.route('/close')
        def shutdown_server():
            core_inst.onionrInst.communicatorInst.service_greenlets.remove(http_server)
            http_server.stop()
            return Response('goodbye')

        @service_app.after_request
        def afterReq(resp):
            # Security headers
            resp = httpheaders.set_default_onionr_http_headers(resp)
            return resp

        with Controller.from_port(port=core_inst.config.get('tor.controlPort')) as controller:
            # Connect to the Tor process for Onionr
            controller.authenticate(core_inst.config.get('tor.controlpassword'))
            # Create the v3 onion service for the peer to connect to
            response = controller.create_ephemeral_hidden_service({80: service_port}, await_publication = True, key_type='NEW', key_content = 'ED25519-V3')

            try:
                for x in range(3):
                    attempt = basicrequests.do_post_request(self.core_inst, 'http://' + address + '/bs/' + response.service_id, port=socks)
                    if attempt == 'success':
                        break
                else:
                    raise ConnectionError
            except ConnectionError:
                # Re-raise
                raise ConnectionError('Could not reach %s bootstrap address %s' % (peer, address))
            else:
                # If no connection error, create the service and save it to local global key store
                self.core_inst.keyStore.put('dc-' + response.service_id, bytesconverter.bytes_to_str(peer))
                logger.info('hosting on %s with %s' % (response.service_id,  peer))
                http_server.serve_forever()
                http_server.stop()
                self.core_inst.keyStore.delete('dc-' + response.service_id)