from typing import AsyncIterator
from fastapi import HTTPException

from ..model.entry import Entry, CreateEntryPayload, UpdateEntryPayload
from ..domain.entry import Entry as DBEntry
from ..domain.meal import Meal as DBMeal
from .base import AuthorizedController


class CreateEntry(AuthorizedController):
    async def call(self, content: CreateEntryPayload) -> Entry:
        async with self.async_session.begin() as session:
            meal = await DBMeal.get_by_id(session, self.user.id, content.meal_id)
            if meal is None:
                raise HTTPException(status_code=404, detail="meal not found")

            try:
                entry = await DBEntry.create(
                    session, content.meal_id, content.product_id, content.grams
                )
                return Entry.from_orm(entry)
            except AssertionError as e:
                raise HTTPException(status_code=400, detail=e.args[0])


class UpdateEntry(AuthorizedController):
    async def call(self, entry_id: int, content: UpdateEntryPayload) -> Entry:
        async with self.async_session.begin() as session:
            entry = await DBEntry.get_by_id(session, self.user.id, entry_id)
            if entry is None:
                raise HTTPException(status_code=404, detail="entry not found")

            try:
                await entry.update(
                    session, content.meal_id, content.product_id, content.grams
                )
                return Entry.from_orm(entry)
            except AssertionError as e:
                raise HTTPException(status_code=400, detail=e.args[0])


class DeleteEntry(AuthorizedController):
    async def call(self, entry_id: int) -> Entry:
        async with self.async_session.begin() as session:
            entry = await DBEntry.get_by_id(session, self.user.id, entry_id)
            if entry is None:
                raise HTTPException(status_code=404, detail="entry not found")

            try:
                await entry.delete(session)
            except AssertionError as e:
                raise HTTPException(status_code=400, detail=e.args[0])