from concurrent.futures import Future
from datetime import timedelta, datetime
from typing import Callable, Optional

from sqlalchemy import select
from sqlalchemy.orm import Session as AlchemySession

from .models import Resource, Recipe, ResourceFlow


def resource_needs_update(resource: Resource | None, recipe_info_timeout: Optional[timedelta] = None) -> bool:
    if recipe_info_timeout is None:
        recipe_info_timeout = timedelta(days=30)
    return (
        resource is None
        or resource.recipes_populated_at is None
        or datetime.utcnow() - resource.recipes_populated_at > recipe_info_timeout
    )


def chose_resource(session: AlchemySession, resource_label: str, prompt: Callable) -> Future[Resource | None]:
    matching_resources = session.scalars(Resource.by_label(resource_label)).all()
    ret = Future()
    if len(matching_resources) == 0:
        print("Could not find any resource matching the search string…")
        ret.set_result(None)
    else:
        options = {(idx + 1): str(matching_resources[idx].label) for idx in range(len(matching_resources))}
        options[0] = "Continue with wiki search…"

        def resource_selected_cb(res_future: Future[int | None]):
            selected_res = res_future.result()
            if selected_res is not None and selected_res != 0:
                ret.set_result(matching_resources[selected_res - 1])
            else:
                ret.set_result(None)

        prompt(options=options, text="Chose a resource", default=1).add_done_callback(resource_selected_cb)
    return ret


def chose_recipe(session: AlchemySession, resource: Resource, prompt: Callable) -> Future[Recipe | None]:
    stmt = select(Recipe).join(Recipe.results).filter(ResourceFlow.resource_id == resource.id)
    recipes = session.scalars(stmt).all()
    ret = Future()
    if len(recipes) == 0:
        print("No recipes found for resource")
        ret.set_result(None)
    elif len(recipes) > 1:
        options = {(idx + 1): recipes[idx].describe() for idx in range(len(recipes))}

        def user_choice_cb(choice_future: Future[int | None]):
            user_choice = choice_future.result()
            if user_choice is None:
                ret.set_result(None)
            else:
                ret.set_result(recipes[user_choice - 1])

        prompt(options=options, text="Select recipe", default=1).add_done_callback(user_choice_cb)
    else:
        ret.set_result(recipes[0])
    return ret