# coding=utf-8
import importlib
import inspect
import logging
import os

from flask import Blueprint, Flask, _request_ctx_stack
from flask_dance.contrib.discord import make_discord_blueprint
from flask_sockets import Sockets

from pysite.base_route import APIView, BaseView, ErrorView, RouteView
from pysite.constants import (
    CSRF, DISCORD_OAUTH_AUTHORIZED, DISCORD_OAUTH_ID, DISCORD_OAUTH_REDIRECT, DISCORD_OAUTH_SCOPE,
    DISCORD_OAUTH_SECRET, PREFERRED_URL_SCHEME)
from pysite.database import RethinkDB
from pysite.oauth import OauthBackend
from pysite.websockets import WS

TEMPLATES_PATH = "../templates"
STATIC_PATH = "../static"


class RouteManager:
    def __init__(self):

        # Set up the app and the database
        self.app = Flask(
            __name__, template_folder=TEMPLATES_PATH, static_folder=STATIC_PATH, static_url_path="/static",
        )
        self.sockets = Sockets(self.app)

        self.db = RethinkDB()
        self.log = logging.getLogger(__name__)
        self.app.secret_key = os.environ.get("WEBPAGE_SECRET_KEY", "super_secret")
        self.app.config["SERVER_NAME"] = os.environ.get("SERVER_NAME", "pythondiscord.local:8080")
        self.app.config["PREFERRED_URL_SCHEME"] = PREFERRED_URL_SCHEME
        self.app.config["WTF_CSRF_CHECK_DEFAULT"] = False  # We only want to protect specific routes

        # We make the token valid for the lifetime of the session because of the wiki - you might spend some
        # time editing an article, and it seems that session lifetime is a good analogue for how long you have
        # to edit
        self.app.config["WTF_CSRF_TIME_LIMIT"] = None

        self.app.before_request(self.db.before_request)
        self.app.teardown_request(self.db.teardown_request)

        CSRF.init_app(self.app)  # Set up CSRF protection

        # Load the oauth blueprint
        self.oauth_backend = OauthBackend(self)
        self.oauth_blueprint = make_discord_blueprint(
            DISCORD_OAUTH_ID,
            DISCORD_OAUTH_SECRET,
            DISCORD_OAUTH_SCOPE,
            '/',
            login_url=DISCORD_OAUTH_REDIRECT,
            authorized_url=DISCORD_OAUTH_AUTHORIZED,
            backend=self.oauth_backend
        )
        self.log.debug(f"Loading Blueprint: {self.oauth_blueprint.name}")
        self.app.register_blueprint(self.oauth_blueprint)
        self.log.debug("")

        # Load the main blueprint
        self.main_blueprint = Blueprint("main", __name__)
        self.log.debug(f"Loading Blueprint: {self.main_blueprint.name}")
        self.load_views(self.main_blueprint, "pysite/views/main")
        self.load_views(self.main_blueprint, "pysite/views/error_handlers")
        self.app.register_blueprint(self.main_blueprint)
        self.log.debug("")

        # Load the subdomains
        self.subdomains = ["api", "staff", "wiki"]

        for sub in self.subdomains:
            try:
                sub_blueprint = Blueprint(sub, __name__, subdomain=sub)
                self.log.debug(f"Loading Blueprint: {sub_blueprint.name}")
                self.load_views(sub_blueprint, f"pysite/views/{sub}")
                self.app.register_blueprint(sub_blueprint)
            except Exception:
                logging.getLogger(__name__).exception(f"Failed to register blueprint for subdomain: {sub}")

        # Load the websockets
        self.ws_blueprint = Blueprint("ws", __name__)

        self.log.debug("Loading websocket routes...")
        self.load_views(self.ws_blueprint, "pysite/views/ws")
        self.sockets.register_blueprint(self.ws_blueprint, url_prefix="/ws")

        self.app.before_request(self.https_fixing_hook)  # Try to fix HTTPS issues

    def https_fixing_hook(self):
        """
        Attempt to fix HTTPS issues by modifying the request context stack
        """

        if _request_ctx_stack is not None:
            reqctx = _request_ctx_stack.top
            reqctx.url_adapter.url_scheme = PREFERRED_URL_SCHEME

    def run(self):
        from gevent.pywsgi import WSGIServer
        from geventwebsocket.handler import WebSocketHandler

        server = WSGIServer(
            ("0.0.0.0", int(os.environ.get("WEBPAGE_PORT", 8080))),  # noqa: B104, S104
            self.app, handler_class=WebSocketHandler
        )
        server.serve_forever()

    def load_views(self, blueprint, location="pysite/views"):
        for filename in os.listdir(location):
            if os.path.isdir(f"{location}/{filename}"):
                # Recurse if it's a directory; load ALL the views!
                self.load_views(blueprint, location=f"{location}/{filename}")
                continue

            if filename.endswith(".py") and not filename.startswith("__init__"):
                module = importlib.import_module(f"{location}/{filename}".replace("/", ".")[:-3])

                for cls_name, cls in inspect.getmembers(module):
                    if (
                            inspect.isclass(cls) and
                            cls is not BaseView and
                            cls is not ErrorView and
                            cls is not RouteView and
                            cls is not APIView and
                            cls is not WS and
                            (
                                BaseView in cls.__mro__ or
                                WS in cls.__mro__
                            )
                    ):
                        cls.setup(self, blueprint)
                        self.log.debug(f">> View loaded: {cls.name: <15} ({module.__name__}.{cls_name})")