from twisted.web.http import Request
import yaml
import logging
import coloredlogs
from logging.handlers import TimedRotatingFileHandler
from os import path
from typing import Tuple, List
from twisted.internet import reactor, endpoints
from twisted.web import server, resource
import importlib

from core.config import CoreConfig
from .config import IDZConfig
from .const import IDZConstants
from .userdb import IDZUserDBFactory, IDZUserDBWeb, IDZKey
from .echo import IDZEcho
from .handlers import IDZHandlerLoadConfigB

class IDZServlet:
    def __init__(self, core_cfg: CoreConfig, cfg_dir: str) -> None:
        self.core_cfg = core_cfg
        self.game_cfg = IDZConfig()
        if path.exists(f"{cfg_dir}/{IDZConstants.CONFIG_NAME}"):
            self.game_cfg.update(
                yaml.safe_load(open(f"{cfg_dir}/{IDZConstants.CONFIG_NAME}"))
            )

        self.logger = logging.getLogger("idz")
        if not hasattr(self.logger, "inited"):
            log_fmt_str = "[%(asctime)s] IDZ | %(levelname)s | %(message)s"
            log_fmt = logging.Formatter(log_fmt_str)
            fileHandler = TimedRotatingFileHandler(
                "{0}/{1}.log".format(self.core_cfg.server.log_dir, "idz"),
                encoding="utf8",
                when="d",
                backupCount=10,
            )

            self.rsa_keys: List[IDZKey] = []

            fileHandler.setFormatter(log_fmt)

            consoleHandler = logging.StreamHandler()
            consoleHandler.setFormatter(log_fmt)

            self.logger.addHandler(fileHandler)
            self.logger.addHandler(consoleHandler)

            self.logger.setLevel(self.game_cfg.server.loglevel)
            coloredlogs.install(
                level=self.game_cfg.server.loglevel, logger=self.logger, fmt=log_fmt_str
            )
            self.logger.inited = True
    
    @classmethod
    def rsaHashKeyN(cls, data):
        hash_ = 0
        for i in data:
            hash_ = hash_ * IDZConstants.HASH_MUL + (i ^ IDZConstants.HASH_XOR) ^ IDZConstants.HASH_LUT[i & 0xf]
            hash_ &= 0xffffffff
        return hash_

    @classmethod
    def get_allnet_info(
        cls, game_code: str, core_cfg: CoreConfig, cfg_dir: str
    ) -> Tuple[bool, str, str]:
        game_cfg = IDZConfig()
        if path.exists(f"{cfg_dir}/{IDZConstants.CONFIG_NAME}"):
            game_cfg.update(
                yaml.safe_load(open(f"{cfg_dir}/{IDZConstants.CONFIG_NAME}"))
            )

        if not game_cfg.server.enable:
            return (False, "", "")

        if len(game_cfg.rsa_keys) <= 0 or not game_cfg.server.aes_key:
            logging.getLogger("idz").error("IDZ: No RSA/AES  keys! IDZ cannot start")
            return (False, "", "")

        hostname = core_cfg.title.hostname if not game_cfg.server.hostname else game_cfg.server.hostname
        return (
            True,
            f"",
            f"{hostname}:{game_cfg.ports.userdb}",
        )

    def setup(self):        
        for key in self.game_cfg.rsa_keys:
            if "N" not in key or "d" not in key or "e" not in key:
                self.logger.error(f"Invalid IDZ key {key}")
                continue

            hashN = self.rsaHashKeyN(str(key["N"]).encode())
            self.rsa_keys.append(IDZKey(key["N"], key["d"], key["e"], hashN))
        
        if len(self.rsa_keys) <= 0:
            self.logger.error("No valid RSA keys provided! IDZ cannot start!")
            return

        handler_map = [{} for _ in range(IDZConstants.NUM_VERS)]
        handler_mod = mod = importlib.import_module(f"titles.idz.handlers")
        
        for cls_name in dir(handler_mod):
            if cls_name.startswith("__"):
                continue

            try:
                mod = getattr(handler_mod, cls_name)
                mod_cmds: List = getattr(mod, "cmd_codes")
                while len(mod_cmds) < IDZConstants.NUM_VERS:
                    mod_cmds.append(None)
                
                for i in range(len(mod_cmds)):
                    if mod_cmds[i] is None:
                        mod_cmds[i] = mod_cmds[i - 1]

                    handler_map[i][mod_cmds[i]] = mod

            except AttributeError as e:
                continue

        endpoints.serverFromString(reactor, f"tcp:{self.game_cfg.ports.userdb}:interface={self.core_cfg.server.listen_address}")\
            .listen(IDZUserDBFactory(self.core_cfg, self.game_cfg, self.rsa_keys, handler_map))
        
        reactor.listenUDP(self.game_cfg.ports.echo, IDZEcho(self.core_cfg, self.game_cfg))
        reactor.listenUDP(self.game_cfg.ports.echo + 1, IDZEcho(self.core_cfg, self.game_cfg))
        reactor.listenUDP(self.game_cfg.ports.match, IDZEcho(self.core_cfg, self.game_cfg))
        reactor.listenUDP(self.game_cfg.ports.userdb + 1, IDZEcho(self.core_cfg, self.game_cfg))
        
        self.logger.info(f"UserDB Listening on port {self.game_cfg.ports.userdb}")

    def render_POST(self, request: Request, version: int, url_path: str) -> bytes:
        req_raw = request.content.getvalue()        
        self.logger.info(f"IDZ POST request: {url_path} - {req_raw}")
        return b""

    def render_GET(self, request: Request, version: int, url_path: str) -> bytes:
        self.logger.info(f"IDZ GET request: {url_path}")    
        request.responseHeaders.setRawHeaders('Content-Type', [b"text/plain; charset=utf-8"])
        request.responseHeaders.setRawHeaders("Last-Modified", [b"Sun, 23 Apr 2023 05:33:20 GMT"])
        
        news = self.game_cfg.server.news if self.game_cfg.server.news else f"Welcome to Initial D Arcade Stage Zero on {self.core_cfg.server.name}!"
        news += "\r\n"
        news = "1979/01/01 00:00:00 2099/12/31 23:59:59 " + news

        return news.encode()