from datetime import timedelta, datetime
from typing import Callable, Optional

import sqlalchemy
from sqlalchemy import select

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: sqlalchemy.Session, resource_label: str, prompt: Callable) -> Resource | None:
    matching_resources = session.scalars(Resource.by_label(resource_label)).all()
    if len(matching_resources) == 0:
        print("Could not find existing resources matching the search string.. starting wiki search")
    else:
        options = {(idx + 1): str(matching_resources[idx].label) for idx in range(len(matching_resources))}
        options[0] = ""
        selected_res = prompt(
            options=options, text="Chose a resource to continue or 0 to continue with a wiki search", default=1
        )
        if selected_res is not None and selected_res != 0:
            return matching_resources[selected_res - 1]
    return None


def chose_recipe(session: sqlalchemy.Session, resource: Resource, prompt: Callable) -> Recipe | None:
    stmt = select(Recipe).join(Recipe.results).filter(ResourceFlow.resource_id == resource.id)
    recipes = session.scalars(stmt).all()
    if len(recipes) == 0:
        print("No recipes found for resource")
        return None
    elif len(recipes) > 1:
        options = {(idx + 1): recipes[idx].describe() for idx in range(len(recipes))}
        user_choice = prompt(options=options, text="Select recipe", default=1)
        if user_choice is None:
            return None
        return recipes[user_choice - 1]
    else:
        return recipes[0]