import sys
import socket

from typing import Any, Dict, List

from meow_base.functionality.validation import valid_string, valid_dict
from meow_base.core.vars import VALID_RECIPE_NAME_CHARS, VALID_VARIABLE_NAME_CHARS
from meow_base.core.base_recipe import BaseRecipe
from meow_base.core.base_monitor import BaseMonitor
from meow_base.core.base_pattern import BasePattern
from meow_base.functionality.meow import create_event
from meow_base.functionality.debug import setup_debugging, print_debug
from meow_base.core.meow import EVENT_KEYS

# watchdog events
EVENT_TYPE_NETWORK = "network"
NETWORK_BASE = "monitor_base"
NETWORK_HASH = "file_hash"

NETWORK_EVENT_KEYS = {
    NETWORK_BASE: str,
    NETWORK_HASH: str,
    **EVENT_KEYS
}

def create_network_event(temp_path:str, rule:Any, base:str, time:float,
            hash:str, extras:Dict[Any,Any]={})->Dict[Any,Any]:
    """Function to create a MEOW event dictionary."""
    return create_event(
        EVENT_TYPE_NETWORK,
        temp_path,
        rule,
        time,
        extras={
            **extras,
            **{
                NETWORK_HASH: hash,
                NETWORK_BASE: base
            }
        }
    )

class Connector():
    def __init__(self, host: int, port: int) -> None:
        self.host = host
        self.port = port
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    # Only used for testing
    def send(self, message: bytes) -> None:
        self.socket.connect((self.host, self.port))
        self.socket.sendall(message)
        self.socket.close()

    def receive(self, path:str, buff_size:int = 2048):
        self.socket.bind((self.host, self.port))
        self.socket.listen()
        conn, _ = self.socket.accept()

        with conn:
            with open(path, "wb") as file_pointer:
                while True:
                    data = conn.recv(buff_size)
                    if not data:
                        break
                    file_pointer.write(data)

class NetworkEventPattern(BasePattern):
    # The port to monitor
    triggering_port:int

    def __init__(self, name: str, triggering_port:int, recipe: str, parameters: Dict[str, Any] = {}, outputs: Dict[str, Any] = {}, sweep: Dict[str, Any] = {}):
        super().__init__(name, recipe, parameters, outputs, sweep)
        self._is_valid_port(triggering_port)
        self.triggering_port = triggering_port

    def _is_valid_port(self, port:int)->None:
        if not isinstance(port, int):
            raise ValueError (
                f"Port '{port}' is not of type int."
            )
        elif not (0 < port < 65536):
            raise ValueError (
                f"Port '{port}' is not valid."
            )

    def _is_valid_recipe(self, recipe:str)->None:
        """Validation check for 'recipe' variable from main constructor.
        Called within parent BasePattern constructor."""
        valid_string(recipe, VALID_RECIPE_NAME_CHARS)

    def _is_valid_parameters(self, parameters:Dict[str,Any])->None:
        """Validation check for 'parameters' variable from main constructor.
        Called within parent BasePattern constructor."""
        valid_dict(parameters, str, Any, strict=False, min_length=0)
        for k in parameters.keys():
            valid_string(k, VALID_VARIABLE_NAME_CHARS)

    def _is_valid_output(self, outputs:Dict[str,str])->None:
        """Validation check for 'output' variable from main constructor.
        Called within parent BasePattern constructor."""
        valid_dict(outputs, str, str, strict=False, min_length=0)
        for k in outputs.keys():
            valid_string(k, VALID_VARIABLE_NAME_CHARS)

class NetworkMonitor(BaseMonitor):
    def __init__(self, patterns: Dict[str, NetworkEventPattern],
            recipes: Dict[str, BaseRecipe], autostart=False,
            name:str="", print:Any=sys.stdout, logging:int=0) -> None:
        super().__init__(patterns, recipes, name=name)
        self._print_target, self.debug_level = setup_debugging(print, logging)
        self.ports = set(
            pattern.triggering_port for pattern in patterns.values()
        )
        if autostart:
            self.start()

    def start(self)->None:
        """Function to start the monitor as an ongoing process/thread. Must be
        implemented by any child process. Depending on the nature of the
        monitor, this may wish to directly call apply_retroactive_rules before
        starting."""
        pass

    def stop(self)->None:
        """Function to stop the monitor as an ongoing process/thread. Must be
        implemented by any child process"""
        pass

    def _is_valid_recipes(self, recipes:Dict[str,BaseRecipe])->None:
        """Validation check for 'recipes' variable from main constructor. Is
        automatically called during initialisation."""
        valid_dict(recipes, str, BaseRecipe, min_length=0, strict=False)

    def _get_valid_pattern_types(self)->List[type]:
        return [NetworkEventPattern]

    def _get_valid_recipe_types(self)->List[type]:
        return [BaseRecipe]