#!/usr/bin/env python3
"""pihole v6 API wrapper"""
"""
requirements:
- pip3 install requests
- 
"""
__version__     = '0.1.0'
__author__      = 'anima'

# imports
import logging
import requests
import json
from datetime import datetime, timedelta


# log settings
logging.basicConfig(format='[%(asctime)s] %(levelname)s %(message)s', level=logging.INFO)


class PiholeAPI:
    def __init__(self, url: str, port: int = 80, ssl: bool = False, passwd: str = None):
        self.url        = url
        self.port       = port
        self.ssl        = ssl
        self.passwd     = passwd
        self.valid_auth = datetime.now()
        self.sid        = None
        self.csrf       = None

    def __query(self, query: str, method: str = 'GET', payload: dict = None, auth_need: bool = True):
        headers = dict()

        # check if http method valid
        valid_methods = ['GET', 'POST', 'PUT', 'DELETE']
        if method not in valid_methods:
            logging.error(f'http {method=} is none of {valid_methods=}')
            return False
        
        # refresh auth if required and set auth info
        if auth_need:
            if not self._check_auth():
                self.do_auth()
            headers['X-FTL-SID']    = self.sid
            headers['X-FTL-CSRF']   = self.csrf

        # create url
        url = 'http'
        if self.ssl:
            url += 's'
        url += f'://{self.url}:{self.port}/api/{query}'

        if payload:
            response = requests.request(method=method, url=url, headers=headers, json=payload, verify=False)
        else:
            response = requests.request(method=method, url=url, headers=headers, verify=False)

        match response.status_code:
            case (200):
                # comment: successfull request
                return json.loads(response.content)
            case (204):
                # comment: successfull (e.g. auth delete)
                return True
            case (_):
                # comment: default fallback
                print()
                print(response.__dict__)
                return False
    # 
    ## Auth based methods
    # 
    def need_auth(self) -> bool:
        """generate a valid session if no auth required
            # TODO: better handling if not successful

        Returns:
            bool: True if a valid session created
        """
        data = self.__query('auth', auth_need=False)
        if not data: 
            logging.error(f'can not get a valid session without password')
            return False
        if data['session']['valid']:
            self.valid_auth = datetime.now() + timedelta(seconds=data['session']['validity'])
            self.sid        = data['session']['sid']
            self.csrf       = data['session']['csrf']
            logging.info(f'successfull new auth created until {self.valid_auth}')
            return True
        return False

    def _check_auth(self) -> bool:
        """check if an auth valid (in time)

        Returns:
            bool: True if auth valid
        """
        now = datetime.now()
        if datetime.now() < self.valid_auth:
            return True
        return False

    def do_auth(self) -> bool:
        """auth via password to get sid / csrf
            
            # TODO: TOTP support

        Returns:
            bool: True if auth successfull
        """
        payload = {'password': self.passwd}
        data = self.__query('auth', 'POST', payload, auth_need=False)
        if not data:
            raise PermissionError(f'Authentication not possible')
        if data['session']['valid']:
            self.valid_auth = datetime.now() + timedelta(seconds=data['session']['validity'])
            self.sid        = data['session']['sid']
            self.csrf       = data['session']['csrf']
            logging.info(f'successfull new auth created until {self.valid_auth}')
            return True
        return False

    def get_sessions(self) -> list | None:
        """List of all current sessions

        Returns:
            list | None: list of sessions if successfull query
        """
        data = self.__query('auth/sessions')
        if data:
            return data['sessions']
        return False

    def delete_session(self, session_id: int = None) -> bool:
        """Delete session by ID

        Args:
            session_id (int, optional): Session ID get from get_sessions. Defaults to None.

        Returns:
            bool: True if session delete successfull
        """
        if session_id is None:
            data = self.get_sessions()
            if not data:
                return False
            for session in data:
                if session['current_session']:
                    return self.delete_session(session['id'])
        if self.__query(f'auth/session/{session_id}', 'DELETE'):
            logging.info(f'successfull delete session with {session_id=}')
            return True

    def get_app_password(self) -> dict | None:
        """Create new application password

            This password can be used for API instet of regular password an TOTP.
            All sessions will be delte if this password set!
            # TODO: set password (hash) to PATCH /api/config/webserver/api/app_pwhash

        Returns:
            dict | None: if successful: app password and hash
        """
        data = self.__query('auth/app')
        return data['app']


def main():
    pi = PiholeAPI(url='localhost', passwd='my-password!')
    pi.get_sessions()


if __name__ == '__main__':
    main()