from justgetit.constants import *
import httpx
import toga

class BackEnd():
    """
    This is the interface for the backend.
    Its a bit over the top to subclass it from a widget, but this way it has access to the app
    """
    application = None

    def __init__(self, app):
        self.application = app


    async def post(self, endpoint, parameters, callback):
        """
        Call the server, always with a POST, for a specific endpoint and the parameters
        in the body
        
        :param endpoint: the endpoint without /api/ (no slashes)
        :param parameters: A dict with the parameters for the call
        :param callback: def in the calling function to return to
        """
        self.status = 0
        self.payload = None
        if len(endpoint)>2:
            try:
                async with httpx.AsyncClient() as client:
                    response = await client.post(f"{API}/{endpoint}", data=parameters)
                self.payload = response.json()
                self.status = int(self.payload['status'])
            except httpx.RequestError as exc:
                self.status = -2
            
            # status 2 means we are in offline mode
            if self.status == -2:
                pass
            elif self.status == 0:
                await self.application.main_window.dialog(
                    toga.InfoDialog("Oops", self.payload['message'])            
                )
            elif self.status == 2:
                await self.application.main_window.dialog(
                    toga.InfoDialog("Thank you", self.payload['message'])            
                )

            callback(parameters, self.payload)

    def postwait(self, endpoint, parameters):
        """
        Call the server, always with a POST, for a specific endpoint and the parameters
        in the body
        
        :param endpoint: the endpoint without /api/ (no slashes)
        :param parameters: A dict with the parameters for the call
        :param callback: def in the calling function to return to
        """
        self.status = 0
        self.payload = None
        if len(endpoint)>2:
            try:
                response = httpx.post(f"{API}/{endpoint}", data=parameters)
                self.payload = response.json()
                self.status = int(self.payload['status'])
            except httpx.RequestError as exc:
                self.status = -2
            
            return self.payload