import os
import sys
import requests
import pdb

class Gitea:

    name = 'Gitea API wrapper'

    def __init__(self, api_base_url=None, access_token=None, session=None):

        self.__gitea_config_path = "config/gitea.txt"

        is_setup = self.__check_setup(self)

        if is_setup:

            self.__api_base_url = self.__get_parameter("api_base_url", self.__gitea_config_path)
            self.__access_token = self.__get_parameter("access_token", self.__gitea_config_path)

        else:

            self.__api_base_url, self.__access_token = self.__setup(self)

        if session:
            self.session = session
        else:
            self.session = requests.Session()

    def register_user(self, email, username, passwd):

        data = {'email':email,
                'full_name':username,
                'login_name':username,
                'must_change_password':True,
                'password':passwd,
                'restricted':False,
                'send_notify':True,
                'source_id':'0',
                'username':username,
                'visibility':'public'
            }

        endpoint = self._Gitea__api_base_url + f'/api/v1/admin/users?access_token={self._Gitea__access_token}'

        response = self.__api_request('POST', endpoint, data)

        is_registered = response.ok

        message = response.json()['message']

        return (is_registered, message)

    def list_users(self):

        data = {
            }

        endpoint = self._Gitea__api_base_url + f'/api/v1/admin/users?token={self._Gitea__access_token}'

        response = self.__api_request('GET', endpoint, data)

        response_ok = response.ok

        user_list = response.json()

        return (response_ok, user_list)

    @staticmethod
    def __check_setup(self):

        is_setup = False

        if not os.path.isfile(self.__gitea_config_path):
            print(f"File {self.__gitea_config_path} not found, running setup.")
        else:
            is_setup = True

        return is_setup

    @staticmethod
    def __setup(self):

        if not os.path.exists('config'):
            os.makedirs('config')

        api_base_url = input("Gitea API base url, in ex. 'https://yourgitea.instance': ")
        access_token = input("Gitea access token: ")

        if not os.path.exists(self.__gitea_config_path):
            with open(self.__gitea_config_path, 'w'): pass
            print(f"{self.__gitea_config_path} created!")

        with open(self.__gitea_config_path, 'a') as the_file:
            print("Writing gitea parameters to " + self.__gitea_config_path)
            the_file.write(f'api_base_url: {api_base_url}\n'+f'access_token: {access_token}\n')

        return (api_base_url, access_token)

    @staticmethod
    def __get_parameter(parameter, file_path ):

        with open( file_path ) as f:
            for line in f:
                if line.startswith( parameter ):
                    return line.replace(parameter + ":", "").strip()

        print(f'{file_path} Missing parameter {parameter}')
        sys.exit(0)

    def __api_request(self, method, endpoint, data):

        try:

            response = self.session.request(method, url = endpoint, data = data)

        except Exception as e:

            raise GiteaNetworkError(f"Could not complete request: {e}")

        if response is None:

            raise GiteaIllegalArgumentError("Illegal request.")

        if not response.ok:

                try:
                    if isinstance(response, dict) and 'error' in response:
                        error_msg = response['error']
                    elif isinstance(response, str):
                        error_msg = response
                    else:
                        error_msg = None
                except ValueError:
                    error_msg = None

                if response.status_code == 404:
                    ex_type = GiteaNotFoundError
                    if not error_msg:
                        error_msg = 'Endpoint not found.'
                        # this is for compatibility with older versions
                        # which raised GiteaAPIError('Endpoint not found.')
                        # on any 404
                elif response.status_code == 401:
                    ex_type = GiteaUnauthorizedError
                elif response.status_code == 422:
                    return response
                elif response.status_code == 500:
                    ex_type = GiteaInternalServerError
                elif response.status_code == 502:
                    ex_type = GiteaBadGatewayError
                elif response.status_code == 503:
                    ex_type = GiteaServiceUnavailableError
                elif response.status_code == 504:
                    ex_type = GiteaGatewayTimeoutError
                elif response.status_code >= 500 and \
                    response.status_code <= 511:
                    ex_type = GiteaServerError
                else:
                    ex_type = GiteaAPIError

                raise ex_type(
                    'Gitea API returned error',
                    response.status_code,
                    response.reason,
                    error_msg)

        else:

            return response

##
# Exceptions
##
class GiteaError(Exception):
    """Base class for Gitea.py exceptions"""

class GiteaIOError(IOError, GiteaError):
    """Base class for Gitea.py I/O errors"""

class GiteaNetworkError(GiteaIOError):
    """Raised when network communication with the server fails"""
    pass
class GiteaAPIError(GiteaError):
    """Raised when the gitea API generates a response that cannot be handled"""
    pass
class GiteaServerError(GiteaAPIError):
    """Raised if the Server is malconfigured and returns a 5xx error code"""
    pass
class GiteaInternalServerError(GiteaServerError):
    """Raised if the Server returns a 500 error"""
    pass

class GiteaBadGatewayError(GiteaServerError):
    """Raised if the Server returns a 502 error"""
    pass

class GiteaServiceUnavailableError(GiteaServerError):
    """Raised if the Server returns a 503 error"""
    pass
class GiteaGatewayTimeoutError(GiteaServerError):
    """Raised if the Server returns a 504 error"""
    pass
class GiteaNotFoundError(GiteaAPIError):
    """Raised when the gitea API returns a 404 Not Found error"""
    pass

class GiteaUnauthorizedError(GiteaAPIError):
    """Raised when the gitea API returns a 401 Unauthorized error

       This happens when an OAuth token is invalid or has been revoked,
       or when trying to access an endpoint that can't be used without
       authentication without providing credentials."""
    pass