import traceback

from django.apps import apps
from django.conf import settings
from rest_framework.response import Response
from rest_framework import serializers, status
from django.contrib.auth import authenticate
from django.utils import timezone
from datetime import timedelta
from api.models.access_token import AccessToken
from api.validator import BaseValidator
from api.utils import decrypt_aes_128_cbc, encrypt_aes_128_cbc, log_critical_error, get_exception_detail
from rest_framework.exceptions import ValidationError
from api.models.user import User
from api.translation import __
from api.views.medical.base import MedicalApiBase
from backend.redis_client import redis_client

class Login(MedicalApiBase):
    # login no need token, so authenticaltion_classes put empty
    authentication_classes = []

    def validate_request(self,request):
        rules = {
            "email": "required|email",
            "password": "required",
        }

        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }

        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)

        # custom error after basic validation

    def post(self, request):
        # Validate input
        try:
            self.validate_request(request)

            email = request.data.get('email')
            encrypted_password = request.data.get('password')

            try:
                key = settings.MEDICAL_PWD_ENCRYPTION_KEY
                iv = settings.MEDICAL_PWD_ENCRYPTION_IV
                password = decrypt_aes_128_cbc(encrypted_password,key,iv)
            except Exception:
                raise ValidationError ({
                    "error":__('validation.login_failed'),
                    "errors": {"email":__("validation.login_failed")}
                })

            app_type = request.headers.get("X-App-Type", "web")
            device = request.headers.get("User-Agent")
            system_type = AccessToken.SYSTEM_TYPE_TO_CODE["medical"]

            # Authenticate user
            user = authenticate(email=email, password=password)

            if not user or user.user_type != User.USER_TYPE.get("admin"):
                raise ValidationError({
                    "error": __('validation.login_failed'),
                    "errors": {"email": __("validation.login_failed")}
                })

            # must delete token, if not will have error due to unique column
            AccessToken.objects.filter(user=user, type=app_type, device=device,system_type=system_type).delete()

            # Create new token
            token = AccessToken.objects.create(
                user=user,
                type=app_type,
                device=device,
                system_type=system_type,
                expires_at=timezone.now() + timedelta(hours=1)
            )

            response = {
                'user': {
                    'id': user.id,
                    'email': user.email,
                    'name': user.name,
                },
                'token': token.token
            }

            return self.api_response(data=response)
        except ValidationError as e:
            first_message = e.detail['error']
            errors = e.detail['errors']
            return self.api_response(error=first_message,errors=errors,code=status.HTTP_400_BAD_REQUEST)
        except Exception as e:
            e_details = get_exception_detail(e)
            log_critical_error(user_id=None,descr=e_details['descr'],url=e_details['url'],trace=e_details['trace'])
            return self.api_response(error=__("message.internal_server_error"),code=status.HTTP_500_INTERNAL_SERVER_ERROR)