import os
import sys
import json
import asyncio
import logging
import tornado.web
import tornado.ioloop
import tornado.log
import tornado.template
import tornado.escape
import tornado.locale
import tornado.httpserver

from app.classes.models.management import HelpersManagement
from app.classes.shared.console import Console
from app.classes.shared.helpers import Helpers
from app.classes.shared.file_helpers import FileHelpers
from app.classes.shared.main_controller import Controller
from app.classes.web.public_handler import PublicHandler
from app.classes.web.panel_handler import PanelHandler
from app.classes.web.default_handler import DefaultHandler
from app.classes.web.routes.api.api_handlers import api_handlers
from app.classes.web.routes.metrics.metrics_handlers import metrics_handlers
from app.classes.web.server_handler import ServerHandler
from app.classes.web.websocket_handler import WebSocketHandler
from app.classes.web.static_handler import CustomStaticHandler
from app.classes.web.status_handler import StatusHandler


logger = logging.getLogger(__name__)


class Webserver:
    controller: Controller
    helper: Helpers

    def __init__(
        self,
        helper: Helpers,
        controller: Controller,
        tasks_manager,
        file_helper: FileHelpers,
    ):
        self.ioloop = None
        self.https_server = None
        self.helper = helper
        self.controller = controller
        self.tasks_manager = tasks_manager
        self.file_helper = file_helper
        self._asyncio_patch()

    @staticmethod
    def log_function(handler):
        info = {
            "Status_Code": handler.get_status(),
            "Method": handler.request.method,
            "URL": handler.request.uri,
            "Remote_IP": handler.request.remote_ip,
            # pylint: disable=consider-using-f-string
            "Elapsed_Time": "%.2fms" % (handler.request.request_time() * 1000),
        }

        tornado.log.access_log.info(json.dumps(info, indent=4))

    @staticmethod
    def _asyncio_patch():
        """
        As of Python 3.8 (on Windows),
        the asyncio default event handler has changed to "proactor",
        where tornado expects the "selector" handler.

        This function checks if the platform is windows and
        changes the event handler to suit.

        (Taken from
        https://github.com/mkdocs/mkdocs/commit/cf2b136d4257787c0de51eba2d9e30ded5245b31)
        """
        logger.debug("Checking if asyncio patch is required")
        if sys.platform.startswith("win") and sys.version_info >= (3, 8):
            # pylint: disable=reimported,import-outside-toplevel,redefined-outer-name
            import asyncio

            try:
                from asyncio import WindowsSelectorEventLoopPolicy
            except ImportError:
                logger.debug(
                    "asyncio patch isn't required"
                )  # Can't assign a policy which doesn't exist.
            else:
                if not isinstance(
                    asyncio.get_event_loop_policy(), WindowsSelectorEventLoopPolicy
                ):
                    asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())
                    logger.debug("Applied asyncio patch")

    def run_tornado(self):
        # let's verify we have an SSL cert
        self.helper.create_self_signed_cert()

        https_port = self.helper.get_setting("https_port")

        debug_errors = self.helper.get_setting("show_errors")
        try:
            cookie_secret = HelpersManagement.get_cookie_secret()
        except:
            cookie_secret = False
        if cookie_secret is False or cookie_secret == "":
            cookie_secret = self.helper.random_string_generator(32)
            HelpersManagement.set_cookie_secret(cookie_secret)

        if not https_port:
            https_port = 8443

        cert_objects = {
            "certfile": os.path.join(
                self.helper.config_dir, "web", "certs", "commander.cert.pem"
            ),
            "keyfile": os.path.join(
                self.helper.config_dir, "web", "certs", "commander.key.pem"
            ),
        }

        logger.info(f"Starting Web Server on ports https:{https_port}")

        asyncio.set_event_loop(asyncio.new_event_loop())

        tornado.template.Loader(".")

        # TODO: Remove because we don't and won't use
        tornado.locale.set_default_locale("en_EN")

        handler_args = {
            "helper": self.helper,
            "controller": self.controller,
            "tasks_manager": self.tasks_manager,
            "translator": self.helper.translation,
            "file_helper": self.file_helper,
        }
        handlers = [
            (r"/", DefaultHandler, handler_args),
            (r"/panel/(.*)", PanelHandler, handler_args),
            (r"/server/(.*)", ServerHandler, handler_args),
            (r"/ws", WebSocketHandler, handler_args),
            (r"/status", StatusHandler, handler_args),
            # API Routes V2
            *api_handlers(handler_args),
            # API Routes OpenMetrics
            *metrics_handlers(handler_args),
            # Using this one at the end
            # to catch all the other requests to Public Handler
            (r"/(.*)", PublicHandler, handler_args),
        ]

        app = tornado.web.Application(
            handlers,
            template_path=os.path.join(self.helper.webroot, "templates"),
            static_path=os.path.join(self.helper.webroot, "static"),
            debug=debug_errors,
            cookie_secret=cookie_secret,
            xsrf_cookies=True,
            autoreload=False,
            log_function=self.log_function,
            login_url="/login",
            default_handler_class=PublicHandler,
            static_handler_class=CustomStaticHandler,
            serve_traceback=debug_errors,
        )
        self.https_server = tornado.httpserver.HTTPServer(app, ssl_options=cert_objects)
        self.https_server.listen(https_port)

        logger.info(
            f"https://{Helpers.get_local_ip()}:{https_port} "
            f"is up and ready for connections."
        )
        Console.info(
            f"https://{Helpers.get_local_ip()}:{https_port} "
            f"is up and ready for connections."
        )

        Console.info("Server Init Complete: Listening For Connections!")

        self.ioloop = tornado.ioloop.IOLoop.current()
        self.ioloop.start()

    def stop_web_server(self):
        logger.info("Shutting Down Web Server")
        Console.info("Shutting Down Web Server")
        self.ioloop.stop()
        self.https_server.stop()
        logger.info("Web Server Stopped")
        Console.info("Web Server Stopped")