How to Build an MVP Presenter View Mock in Python

from dataclasses import dataclass, field
from typing import List


@dataclass
class SlideDeck:
    title: str
    slides: List[str] = field(default_factory=list)
    current_index: int = 0

    def next_slide(self) -> str:
        if self.current_index < len(self.slides) - 1:
            self.current_index += 1
        return self.current_slide()

    def previous_slide(self) -> str:
        if self.current_index > 0:
            self.current_index -= 1
        return self.current_slide()

    def current_slide(self) -> str:
        return self.slides[self.current_index]

    def set_slide(self, index: int) -> str:
        if 0 <= index < len(self.slides):
            self.current_index = index
        return self.current_slide()


@dataclass
class Presenter:
    name: str
    deck: SlideDeck

    def present(self) -> str:
        return f"{self.name} is showing: {self.deck.current_slide()}"


if __name__ == "__main__":
    deck = SlideDeck(
        title="MVP Demo",
        slides=[
            "Welcome: Intro to the app",
            "Architecture: MVP pattern",
            "Live demo: Feature walkthrough",
            "Q&A and next steps"
        ]
    )
    presenter = Presenter("Alice", deck)

    print(presenter.present())
    print(presenter.deck.next_slide())
    print(presenter.present())
    print(presenter.deck.previous_slide())
    presenter.deck.set_slide(3)
    print(presenter.present())
    print(f"Deck: {presenter.deck.title} | Position: {presenter.deck.current_index + 1}/{len(presenter.deck.slides)}")